OpenShift Container Platform

Specify the TLS security profile type (Old, Intermediate, or Custom). The default is Intermediate.

Specify the appropriate field for the selected type:

old: {}
intermediate: {}
custom:

For the custom type, specify a list of TLS ciphers and minimum accepted TLS version.

Save the file to apply the changes.

Verification

Verify that the profile is set in the IngressController CR:

oc describe IngressController default -n openshift-ingress-operator

$ oc describe IngressController default -n openshift-ingress-operator

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Example output

Name:         default
Namespace:    openshift-ingress-operator
Labels:       <none>
Annotations:  <none>
API Version:  operator.openshift.io/v1
Kind:         IngressController
 ...
Spec:
 ...
  Tls Security Profile:
    Custom:
      Ciphers:
        ECDHE-ECDSA-CHACHA20-POLY1305
        ECDHE-RSA-CHACHA20-POLY1305
        ECDHE-RSA-AES128-GCM-SHA256
        ECDHE-ECDSA-AES128-GCM-SHA256
      Min TLS Version:  VersionTLS11
    Type:               Custom
 ...

Name:         default
Namespace:    openshift-ingress-operator
Labels:       <none>
Annotations:  <none>
API Version:  operator.openshift.io/v1
Kind:         IngressController
 ...
Spec:
 ...
  Tls Security Profile:
    Custom:
      Ciphers:
        ECDHE-ECDSA-CHACHA20-POLY1305
        ECDHE-RSA-CHACHA20-POLY1305
        ECDHE-RSA-AES128-GCM-SHA256
        ECDHE-ECDSA-AES128-GCM-SHA256
      Min TLS Version:  VersionTLS11
    Type:               Custom
 ...

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7.3.1.3. Configuring mutual TLS authentication

You can configure the Ingress Controller to enable mutual TLS (mTLS) authentication by setting a spec.clientTLS value. The clientTLS value configures the Ingress Controller to verify client certificates. This configuration includes setting a clientCA value, which is a reference to a config map. The config map contains the PEM-encoded CA certificate bundle that is used to verify a client’s certificate. Optionally, you can also configure a list of certificate subject filters.

If the clientCA value specifies an X509v3 certificate revocation list (CRL) distribution point, the Ingress Operator downloads and manages a CRL config map based on the HTTP URI X509v3 CRL Distribution Point specified in each provided certificate. The Ingress Controller uses this config map during mTLS/TLS negotiation. Requests that do not provide valid certificates are rejected.

Prerequisites

You have access to the cluster as a user with the cluster-admin role.
You have a PEM-encoded CA certificate bundle.

If your CA bundle references a CRL distribution point, you must have also included the end-entity or leaf certificate to the client CA bundle. This certificate must have included an HTTP URI under CRL Distribution Points, as described in RFC 5280. For example:

 Issuer: C=US, O=Example Inc, CN=Example Global G2 TLS RSA SHA256 2020 CA1
         Subject: SOME SIGNED CERT            X509v3 CRL Distribution Points:
                Full Name:
                  URI:http://crl.example.com/example.crl

 Issuer: C=US, O=Example Inc, CN=Example Global G2 TLS RSA SHA256 2020 CA1
         Subject: SOME SIGNED CERT            X509v3 CRL Distribution Points:
                Full Name:
                  URI:http://crl.example.com/example.crl

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Procedure

In the openshift-config namespace, create a config map from your CA bundle:

oc create configmap \
   router-ca-certs-default \
   --from-file=ca-bundle.pem=client-ca.crt \
   -n openshift-config

$ oc create configmap \
   router-ca-certs-default \
   --from-file=ca-bundle.pem=client-ca.crt \

1


   -n openshift-config

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1: The config map data key must be ca-bundle.pem, and the data value must be a CA certificate in PEM format.

Edit the IngressController resource in the openshift-ingress-operator project:

oc edit IngressController default -n openshift-ingress-operator

$ oc edit IngressController default -n openshift-ingress-operator

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Add the spec.clientTLS field and subfields to configure mutual TLS:

Sample IngressController CR for a clientTLS profile that specifies filtering patterns

  apiVersion: operator.openshift.io/v1
  kind: IngressController
  metadata:
    name: default
    namespace: openshift-ingress-operator
  spec:
    clientTLS:
      clientCertificatePolicy: Required
      clientCA:
        name: router-ca-certs-default
      allowedSubjectPatterns:
      - "^/CN=example.com/ST=NC/C=US/O=Security/OU=OpenShift$"

  apiVersion: operator.openshift.io/v1
  kind: IngressController
  metadata:
    name: default
    namespace: openshift-ingress-operator
  spec:
    clientTLS:
      clientCertificatePolicy: Required
      clientCA:
        name: router-ca-certs-default
      allowedSubjectPatterns:
      - "^/CN=example.com/ST=NC/C=US/O=Security/OU=OpenShift$"

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Optional, get the Distinguished Name (DN) for allowedSubjectPatterns by entering the following command.

openssl  x509 -in custom-cert.pem  -noout -subject

$ openssl  x509 -in custom-cert.pem  -noout -subject
subject= /CN=example.com/ST=NC/C=US/O=Security/OU=OpenShift

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7.4. View the default Ingress Controller

The Ingress Operator is a core feature of OpenShift Container Platform and is enabled out of the box.

Every new OpenShift Container Platform installation has an ingresscontroller named default. It can be supplemented with additional Ingress Controllers. If the default ingresscontroller is deleted, the Ingress Operator will automatically recreate it within a minute.

Procedure

View the default Ingress Controller:

oc describe --namespace=openshift-ingress-operator ingresscontroller/default

$ oc describe --namespace=openshift-ingress-operator ingresscontroller/default

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7.5. View Ingress Operator status

You can view and inspect the status of your Ingress Operator.

Procedure

View your Ingress Operator status:

oc describe clusteroperators/ingress

$ oc describe clusteroperators/ingress

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7.6. View Ingress Controller logs

You can view your Ingress Controller logs.

Procedure

View your Ingress Controller logs:

oc logs --namespace=openshift-ingress-operator deployments/ingress-operator -c <container_name>

$ oc logs --namespace=openshift-ingress-operator deployments/ingress-operator -c <container_name>

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7.7. View Ingress Controller status

Your can view the status of a particular Ingress Controller.

Procedure

View the status of an Ingress Controller:

oc describe --namespace=openshift-ingress-operator ingresscontroller/<name>

$ oc describe --namespace=openshift-ingress-operator ingresscontroller/<name>

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7.8. Configuring the Ingress Controller

7.8.1. Setting a custom default certificate

As an administrator, you can configure an Ingress Controller to use a custom certificate by creating a Secret resource and editing the IngressController custom resource (CR).

Prerequisites

You must have a certificate/key pair in PEM-encoded files, where the certificate is signed by a trusted certificate authority or by a private trusted certificate authority that you configured in a custom PKI.
Your certificate meets the following requirements:
- The certificate is valid for the ingress domain.
- The certificate uses the subjectAltName extension to specify a wildcard domain, such as *.apps.ocp4.example.com.

You must have an IngressController CR. You may use the default one:

oc --namespace openshift-ingress-operator get ingresscontrollers

$ oc --namespace openshift-ingress-operator get ingresscontrollers

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Example output

NAME      AGE
default   10m

NAME      AGE
default   10m

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Note

If you have intermediate certificates, they must be included in the tls.crt file of the secret containing a custom default certificate. Order matters when specifying a certificate; list your intermediate certificate(s) after any server certificate(s).

Procedure

The following assumes that the custom certificate and key pair are in the tls.crt and tls.key files in the current working directory. Substitute the actual path names for tls.crt and tls.key. You also may substitute another name for custom-certs-default when creating the Secret resource and referencing it in the IngressController CR.

Note

This action will cause the Ingress Controller to be redeployed, using a rolling deployment strategy.

Create a Secret resource containing the custom certificate in the openshift-ingress namespace using the tls.crt and tls.key files.

oc --namespace openshift-ingress create secret tls custom-certs-default --cert=tls.crt --key=tls.key

$ oc --namespace openshift-ingress create secret tls custom-certs-default --cert=tls.crt --key=tls.key

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Update the IngressController CR to reference the new certificate secret:

oc patch --type=merge --namespace openshift-ingress-operator ingresscontrollers/default \
  --patch '{"spec":{"defaultCertificate":{"name":"custom-certs-default"}}}'

$ oc patch --type=merge --namespace openshift-ingress-operator ingresscontrollers/default \
  --patch '{"spec":{"defaultCertificate":{"name":"custom-certs-default"}}}'

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Verify the update was effective:

echo Q |\
  openssl s_client -connect console-openshift-console.apps.<domain>:443 -showcerts 2>/dev/null |\
  openssl x509 -noout -subject -issuer -enddate

$ echo Q |\
  openssl s_client -connect console-openshift-console.apps.<domain>:443 -showcerts 2>/dev/null |\
  openssl x509 -noout -subject -issuer -enddate

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where:

<domain>: Specifies the base domain name for your cluster.

Example output

subject=C = US, ST = NC, L = Raleigh, O = RH, OU = OCP4, CN = *.apps.example.com
issuer=C = US, ST = NC, L = Raleigh, O = RH, OU = OCP4, CN = example.com
notAfter=May 10 08:32:45 2022 GM

subject=C = US, ST = NC, L = Raleigh, O = RH, OU = OCP4, CN = *.apps.example.com
issuer=C = US, ST = NC, L = Raleigh, O = RH, OU = OCP4, CN = example.com
notAfter=May 10 08:32:45 2022 GM

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Tip

You can alternatively apply the following YAML to set a custom default certificate:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  defaultCertificate:
    name: custom-certs-default

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  defaultCertificate:
    name: custom-certs-default

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The certificate secret name should match the value used to update the CR.

Once the IngressController CR has been modified, the Ingress Operator updates the Ingress Controller’s deployment to use the custom certificate.

7.8.2. Removing a custom default certificate

As an administrator, you can remove a custom certificate that you configured an Ingress Controller to use.

Prerequisites

You have access to the cluster as a user with the cluster-admin role.
You have installed the OpenShift CLI (oc).
You previously configured a custom default certificate for the Ingress Controller.

Procedure

To remove the custom certificate and restore the certificate that ships with OpenShift Container Platform, enter the following command:

oc patch -n openshift-ingress-operator ingresscontrollers/default \
  --type json -p $'- op: remove\n  path: /spec/defaultCertificate'

$ oc patch -n openshift-ingress-operator ingresscontrollers/default \
  --type json -p $'- op: remove\n  path: /spec/defaultCertificate'

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There can be a delay while the cluster reconciles the new certificate configuration.

Verification

To confirm that the original cluster certificate is restored, enter the following command:

echo Q | \
  openssl s_client -connect console-openshift-console.apps.<domain>:443 -showcerts 2>/dev/null | \
  openssl x509 -noout -subject -issuer -enddate

$ echo Q | \
  openssl s_client -connect console-openshift-console.apps.<domain>:443 -showcerts 2>/dev/null | \
  openssl x509 -noout -subject -issuer -enddate

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where:

<domain>: Specifies the base domain name for your cluster.

Example output

subject=CN = *.apps.<domain>
issuer=CN = ingress-operator@1620633373
notAfter=May 10 10:44:36 2023 GMT

subject=CN = *.apps.<domain>
issuer=CN = ingress-operator@1620633373
notAfter=May 10 10:44:36 2023 GMT

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7.8.3. Autoscaling an Ingress Controller

You can automatically scale an Ingress Controller to dynamically meet routing performance or availability requirements, such as the requirement to increase throughput.

The following procedure provides an example for scaling up the default Ingress Controller.

Prerequisites

You have the OpenShift CLI (oc) installed.
You have access to an OpenShift Container Platform cluster as a user with the cluster-admin role.
You installed the Custom Metrics Autoscaler Operator and an associated KEDA Controller.
- You can install the Operator by using OperatorHub on the web console. After you install the Operator, you can create an instance of KedaController.

Procedure

Create a service account to authenticate with Thanos by running the following command:

oc create -n openshift-ingress-operator serviceaccount thanos && oc describe -n openshift-ingress-operator serviceaccount thanos

$ oc create -n openshift-ingress-operator serviceaccount thanos && oc describe -n openshift-ingress-operator serviceaccount thanos

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Example output

Name:                thanos
Namespace:           openshift-ingress-operator
Labels:              <none>
Annotations:         <none>
Image pull secrets:  thanos-dockercfg-kfvf2
Mountable secrets:   thanos-dockercfg-kfvf2
Tokens:              thanos-token-c422q
Events:              <none>

Name:                thanos
Namespace:           openshift-ingress-operator
Labels:              <none>
Annotations:         <none>
Image pull secrets:  thanos-dockercfg-kfvf2
Mountable secrets:   thanos-dockercfg-kfvf2
Tokens:              thanos-token-c422q
Events:              <none>

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Manually create the service account secret token with the following command:

oc apply -f - <<EOF
apiVersion: v1
kind: Secret
metadata:
  name: thanos-token
  namespace: openshift-ingress-operator
  annotations:
    kubernetes.io/service-account.name: thanos
type: kubernetes.io/service-account-token
EOF

$ oc apply -f - <<EOF
apiVersion: v1
kind: Secret
metadata:
  name: thanos-token
  namespace: openshift-ingress-operator
  annotations:
    kubernetes.io/service-account.name: thanos
type: kubernetes.io/service-account-token
EOF

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Define a TriggerAuthentication object within the openshift-ingress-operator namespace by using the service account’s token.

Define the secret variable that contains the secret by running the following command:

secret=$(oc get secret -n openshift-ingress-operator | grep thanos-token | head -n 1 | awk '{ print $1 }')

$ secret=$(oc get secret -n openshift-ingress-operator | grep thanos-token | head -n 1 | awk '{ print $1 }')

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Create the TriggerAuthentication object and pass the value of the secret variable to the TOKEN parameter:

oc process TOKEN="$secret" -f - <<EOF | oc apply -n openshift-ingress-operator -f -
apiVersion: template.openshift.io/v1
kind: Template
parameters:
- name: TOKEN
objects:
- apiVersion: keda.sh/v1alpha1
  kind: TriggerAuthentication
  metadata:
    name: keda-trigger-auth-prometheus
  spec:
    secretTargetRef:
    - parameter: bearerToken
      name: \${TOKEN}
      key: token
    - parameter: ca
      name: \${TOKEN}
      key: ca.crt
EOF

$ oc process TOKEN="$secret" -f - <<EOF | oc apply -n openshift-ingress-operator -f -
apiVersion: template.openshift.io/v1
kind: Template
parameters:
- name: TOKEN
objects:
- apiVersion: keda.sh/v1alpha1
  kind: TriggerAuthentication
  metadata:
    name: keda-trigger-auth-prometheus
  spec:
    secretTargetRef:
    - parameter: bearerToken
      name: \${TOKEN}
      key: token
    - parameter: ca
      name: \${TOKEN}
      key: ca.crt
EOF

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Create and apply a role for reading metrics from Thanos:

Create a new role, thanos-metrics-reader.yaml, that reads metrics from pods and nodes:

thanos-metrics-reader.yaml

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: thanos-metrics-reader
  namespace: openshift-ingress-operator
rules:
- apiGroups:
  - ""
  resources:
  - pods
  - nodes
  verbs:
  - get
- apiGroups:
  - metrics.k8s.io
  resources:
  - pods
  - nodes
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - namespaces
  verbs:
  - get

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: thanos-metrics-reader
  namespace: openshift-ingress-operator
rules:
- apiGroups:
  - ""
  resources:
  - pods
  - nodes
  verbs:
  - get
- apiGroups:
  - metrics.k8s.io
  resources:
  - pods
  - nodes
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - namespaces
  verbs:
  - get

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Apply the new role by running the following command:

oc apply -f thanos-metrics-reader.yaml

$ oc apply -f thanos-metrics-reader.yaml

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Add the new role to the service account by entering the following commands:

oc adm policy -n openshift-ingress-operator add-role-to-user thanos-metrics-reader -z thanos --role-namespace=openshift-ingress-operator

$ oc adm policy -n openshift-ingress-operator add-role-to-user thanos-metrics-reader -z thanos --role-namespace=openshift-ingress-operator

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oc adm policy -n openshift-ingress-operator add-cluster-role-to-user cluster-monitoring-view -z thanos

$ oc adm policy -n openshift-ingress-operator add-cluster-role-to-user cluster-monitoring-view -z thanos

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Note

The argument add-cluster-role-to-user is only required if you use cross-namespace queries. The following step uses a query from the kube-metrics namespace which requires this argument.

Create a new ScaledObject YAML file, ingress-autoscaler.yaml, that targets the default Ingress Controller deployment:

Example ScaledObject definition

apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name: ingress-scaler
  namespace: openshift-ingress-operator
spec:
  scaleTargetRef: 
    apiVersion: operator.openshift.io/v1
    kind: IngressController
    name: default
    envSourceContainerName: ingress-operator
  minReplicaCount: 1
  maxReplicaCount: 20 
  cooldownPeriod: 1
  pollingInterval: 1
  triggers:
  - type: prometheus
    metricType: AverageValue
    metadata:
      serverAddress: https://thanos-querier.openshift-monitoring.svc.cluster.local:9091 
      namespace: openshift-ingress-operator 
      metricName: 'kube-node-role'
      threshold: '1'
      query: 'sum(kube_node_role{role="worker",service="kube-state-metrics"})' 
      authModes: "bearer"
    authenticationRef:
      name: keda-trigger-auth-prometheus

apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name: ingress-scaler
  namespace: openshift-ingress-operator
spec:
  scaleTargetRef:

1


    apiVersion: operator.openshift.io/v1
    kind: IngressController
    name: default
    envSourceContainerName: ingress-operator
  minReplicaCount: 1
  maxReplicaCount: 20

2


  cooldownPeriod: 1
  pollingInterval: 1
  triggers:
  - type: prometheus
    metricType: AverageValue
    metadata:
      serverAddress: https://thanos-querier.openshift-monitoring.svc.cluster.local:9091

3


      namespace: openshift-ingress-operator

4


      metricName: 'kube-node-role'
      threshold: '1'
      query: 'sum(kube_node_role{role="worker",service="kube-state-metrics"})'

5


      authModes: "bearer"
    authenticationRef:
      name: keda-trigger-auth-prometheus

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1: The custom resource that you are targeting. In this case, the Ingress Controller.
2: Optional: The maximum number of replicas. If you omit this field, the default maximum is set to 100 replicas.
3: The Thanos service endpoint in the openshift-monitoring namespace.
4: The Ingress Operator namespace.
5: This expression evaluates to however many worker nodes are present in the deployed cluster.

Important

If you are using cross-namespace queries, you must target port 9091 and not port 9092 in the serverAddress field. You also must have elevated privileges to read metrics from this port.

Apply the custom resource definition by running the following command:
```
oc apply -f ingress-autoscaler.yaml
```
```
$ oc apply -f ingress-autoscaler.yaml
```
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Verification

Verify that the default Ingress Controller is scaled out to match the value returned by the kube-state-metrics query by running the following commands:

Use the grep command to search the Ingress Controller YAML file for replicas:

oc get -n openshift-ingress-operator ingresscontroller/default -o yaml | grep replicas:

$ oc get -n openshift-ingress-operator ingresscontroller/default -o yaml | grep replicas:

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Example output

  replicas: 3

  replicas: 3

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Get the pods in the openshift-ingress project:

oc get pods -n openshift-ingress

$ oc get pods -n openshift-ingress

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Example output

NAME                             READY   STATUS    RESTARTS   AGE
router-default-7b5df44ff-l9pmm   2/2     Running   0          17h
router-default-7b5df44ff-s5sl5   2/2     Running   0          3d22h
router-default-7b5df44ff-wwsth   2/2     Running   0          66s

NAME                             READY   STATUS    RESTARTS   AGE
router-default-7b5df44ff-l9pmm   2/2     Running   0          17h
router-default-7b5df44ff-s5sl5   2/2     Running   0          3d22h
router-default-7b5df44ff-wwsth   2/2     Running   0          66s

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7.8.4. Scaling an Ingress Controller

Manually scale an Ingress Controller to meeting routing performance or availability requirements such as the requirement to increase throughput. oc commands are used to scale the IngressController resource. The following procedure provides an example for scaling up the default IngressController.

Note

Scaling is not an immediate action, as it takes time to create the desired number of replicas.

Procedure

View the current number of available replicas for the default IngressController:

oc get -n openshift-ingress-operator ingresscontrollers/default -o jsonpath='{$.status.availableReplicas}'

$ oc get -n openshift-ingress-operator ingresscontrollers/default -o jsonpath='{$.status.availableReplicas}'

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Example output

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Scale the default IngressController to the desired number of replicas using the oc patch command. The following example scales the default IngressController to 3 replicas:

oc patch -n openshift-ingress-operator ingresscontroller/default --patch '{"spec":{"replicas": 3}}' --type=merge

$ oc patch -n openshift-ingress-operator ingresscontroller/default --patch '{"spec":{"replicas": 3}}' --type=merge

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Example output

ingresscontroller.operator.openshift.io/default patched

ingresscontroller.operator.openshift.io/default patched

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Verify that the default IngressController scaled to the number of replicas that you specified:

oc get -n openshift-ingress-operator ingresscontrollers/default -o jsonpath='{$.status.availableReplicas}'

$ oc get -n openshift-ingress-operator ingresscontrollers/default -o jsonpath='{$.status.availableReplicas}'

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Example output

Copy to Clipboard

Tip

You can alternatively apply the following YAML to scale an Ingress Controller to three replicas:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 3

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 3

1

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1: If you need a different amount of replicas, change the replicas value.

7.8.5. Configuring Ingress access logging

You can configure the Ingress Controller to enable access logs. If you have clusters that do not receive much traffic, then you can log to a sidecar. If you have high traffic clusters, to avoid exceeding the capacity of the logging stack or to integrate with a logging infrastructure outside of OpenShift Container Platform, you can forward logs to a custom syslog endpoint. You can also specify the format for access logs.

Container logging is useful to enable access logs on low-traffic clusters when there is no existing Syslog logging infrastructure, or for short-term use while diagnosing problems with the Ingress Controller.

Syslog is needed for high-traffic clusters where access logs could exceed the OpenShift Logging stack’s capacity, or for environments where any logging solution needs to integrate with an existing Syslog logging infrastructure. The Syslog use-cases can overlap.

Prerequisites

Log in as a user with cluster-admin privileges.

Procedure

Configure Ingress access logging to a sidecar.

To configure Ingress access logging, you must specify a destination using spec.logging.access.destination. To specify logging to a sidecar container, you must specify Container spec.logging.access.destination.type. The following example is an Ingress Controller definition that logs to a Container destination:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 2
  logging:
    access:
      destination:
        type: Container

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 2
  logging:
    access:
      destination:
        type: Container

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When you configure the Ingress Controller to log to a sidecar, the operator creates a container named logs inside the Ingress Controller Pod:

oc -n openshift-ingress logs deployment.apps/router-default -c logs

$ oc -n openshift-ingress logs deployment.apps/router-default -c logs

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Example output

2020-05-11T19:11:50.135710+00:00 router-default-57dfc6cd95-bpmk6 router-default-57dfc6cd95-bpmk6 haproxy[108]: 174.19.21.82:39654 [11/May/2020:19:11:50.133] public be_http:hello-openshift:hello-openshift/pod:hello-openshift:hello-openshift:10.128.2.12:8080 0/0/1/0/1 200 142 - - --NI 1/1/0/0/0 0/0 "GET / HTTP/1.1"

2020-05-11T19:11:50.135710+00:00 router-default-57dfc6cd95-bpmk6 router-default-57dfc6cd95-bpmk6 haproxy[108]: 174.19.21.82:39654 [11/May/2020:19:11:50.133] public be_http:hello-openshift:hello-openshift/pod:hello-openshift:hello-openshift:10.128.2.12:8080 0/0/1/0/1 200 142 - - --NI 1/1/0/0/0 0/0 "GET / HTTP/1.1"

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Configure Ingress access logging to a Syslog endpoint.

To configure Ingress access logging, you must specify a destination using spec.logging.access.destination. To specify logging to a Syslog endpoint destination, you must specify Syslog for spec.logging.access.destination.type. If the destination type is Syslog, you must also specify a destination endpoint using spec.logging.access.destination.syslog.endpoint and you can specify a facility using spec.logging.access.destination.syslog.facility. The following example is an Ingress Controller definition that logs to a Syslog destination:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 2
  logging:
    access:
      destination:
        type: Syslog
        syslog:
          address: 1.2.3.4
          port: 10514

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 2
  logging:
    access:
      destination:
        type: Syslog
        syslog:
          address: 1.2.3.4
          port: 10514

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Note

The syslog destination port must be UDP.

Configure Ingress access logging with a specific log format.

You can specify spec.logging.access.httpLogFormat to customize the log format. The following example is an Ingress Controller definition that logs to a syslog endpoint with IP address 1.2.3.4 and port 10514:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 2
  logging:
    access:
      destination:
        type: Syslog
        syslog:
          address: 1.2.3.4
          port: 10514
      httpLogFormat: '%ci:%cp [%t] %ft %b/%s %B %bq %HM %HU %HV'

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 2
  logging:
    access:
      destination:
        type: Syslog
        syslog:
          address: 1.2.3.4
          port: 10514
      httpLogFormat: '%ci:%cp [%t] %ft %b/%s %B %bq %HM %HU %HV'

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Disable Ingress access logging.

To disable Ingress access logging, leave spec.logging or spec.logging.access empty:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 2
  logging:
    access: null

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  replicas: 2
  logging:
    access: null

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7.8.6. Setting Ingress Controller thread count

A cluster administrator can set the thread count to increase the amount of incoming connections a cluster can handle. You can patch an existing Ingress Controller to increase the amount of threads.

Prerequisites

The following assumes that you already created an Ingress Controller.

Procedure

Update the Ingress Controller to increase the number of threads:
```
oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge -p '{"spec":{"tuningOptions": {"threadCount": 8}}}'
```
```
$ oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge -p '{"spec":{"tuningOptions": {"threadCount": 8}}}'
```
Copy to Clipboard
Note
If you have a node that is capable of running large amounts of resources, you can configure spec.nodePlacement.nodeSelector with labels that match the capacity of the intended node, and configure spec.tuningOptions.threadCount to an appropriately high value.

7.8.7. Configuring an Ingress Controller to use an internal load balancer

When creating an Ingress Controller on cloud platforms, the Ingress Controller is published by a public cloud load balancer by default. As an administrator, you can create an Ingress Controller that uses an internal cloud load balancer.

Warning

If your cloud provider is Microsoft Azure, you must have at least one public load balancer that points to your nodes. If you do not, all of your nodes will lose egress connectivity to the internet.

Important

If you want to change the scope for an IngressController, you can change the .spec.endpointPublishingStrategy.loadBalancer.scope parameter after the custom resource (CR) is created.

Figure 7.1. Diagram of LoadBalancer

OpenShift Container Platform Ingress LoadBalancerService endpoint publishing strategy

The preceding graphic shows the following concepts pertaining to OpenShift Container Platform Ingress LoadBalancerService endpoint publishing strategy:

You can load balance externally, using the cloud provider load balancer, or internally, using the OpenShift Ingress Controller Load Balancer.
You can use the single IP address of the load balancer and more familiar ports, such as 8080 and 4200 as shown on the cluster depicted in the graphic.
Traffic from the external load balancer is directed at the pods, and managed by the load balancer, as depicted in the instance of a down node. See the Kubernetes Services documentation for implementation details.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create an IngressController custom resource (CR) in a file named <name>-ingress-controller.yaml, such as in the following example:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  namespace: openshift-ingress-operator
  name: <name> 
spec:
  domain: <domain> 
  endpointPublishingStrategy:
    type: LoadBalancerService
    loadBalancer:
      scope: Internal

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  namespace: openshift-ingress-operator
  name: <name>

1


spec:
  domain: <domain>

2


  endpointPublishingStrategy:
    type: LoadBalancerService
    loadBalancer:
      scope: Internal

3

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1: Replace <name> with a name for the IngressController object.
2: Specify the domain for the application published by the controller.
3: Specify a value of Internal to use an internal load balancer.

Create the Ingress Controller defined in the previous step by running the following command:
```
oc create -f <name>-ingress-controller.yaml
```
```
$ oc create -f <name>-ingress-controller.yaml 
```
1
Copy to Clipboard
1
Replace <name> with the name of the IngressController object.
Optional: Confirm that the Ingress Controller was created by running the following command:
```
oc --all-namespaces=true get ingresscontrollers
```
```
$ oc --all-namespaces=true get ingresscontrollers
```
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7.8.8. Configuring global access for an Ingress Controller on GCP

An Ingress Controller created on GCP with an internal load balancer generates an internal IP address for the service. A cluster administrator can specify the global access option, which enables clients in any region within the same VPC network and compute region as the load balancer, to reach the workloads running on your cluster.

For more information, see the GCP documentation for global access.

Prerequisites

You deployed an OpenShift Container Platform cluster on GCP infrastructure.
You configured an Ingress Controller to use an internal load balancer.
You installed the OpenShift CLI (oc).

Procedure

Configure the Ingress Controller resource to allow global access.

Note

You can also create an Ingress Controller and specify the global access option.

Configure the Ingress Controller resource:

oc -n openshift-ingress-operator edit ingresscontroller/default

$ oc -n openshift-ingress-operator edit ingresscontroller/default

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Edit the YAML file:

Sample clientAccess configuration to Global

  spec:
    endpointPublishingStrategy:
      loadBalancer:
        providerParameters:
          gcp:
            clientAccess: Global 
          type: GCP
        scope: Internal
      type: LoadBalancerService

  spec:
    endpointPublishingStrategy:
      loadBalancer:
        providerParameters:
          gcp:
            clientAccess: Global

1


          type: GCP
        scope: Internal
      type: LoadBalancerService

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1: Set gcp.clientAccess to Global.

Save the file to apply the changes.

Run the following command to verify that the service allows global access:
```
oc -n openshift-ingress edit svc/router-default -o yaml
```
```
$ oc -n openshift-ingress edit svc/router-default -o yaml
```
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The output shows that global access is enabled for GCP with the annotation, networking.gke.io/internal-load-balancer-allow-global-access.

7.8.9. Setting the Ingress Controller health check interval

A cluster administrator can set the health check interval to define how long the router waits between two consecutive health checks. This value is applied globally as a default for all routes. The default value is 5 seconds.

Prerequisites

The following assumes that you already created an Ingress Controller.

Procedure

Update the Ingress Controller to change the interval between back end health checks:

oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge -p '{"spec":{"tuningOptions": {"healthCheckInterval": "8s"}}}'

$ oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge -p '{"spec":{"tuningOptions": {"healthCheckInterval": "8s"}}}'

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Note

To override the healthCheckInterval for a single route, use the route annotation router.openshift.io/haproxy.health.check.interval

7.8.10. Configuring the default Ingress Controller for your cluster to be internal

You can configure the default Ingress Controller for your cluster to be internal by deleting and recreating it.

Warning

If your cloud provider is Microsoft Azure, you must have at least one public load balancer that points to your nodes. If you do not, all of your nodes will lose egress connectivity to the internet.

Important

If you want to change the scope for an IngressController, you can change the .spec.endpointPublishingStrategy.loadBalancer.scope parameter after the custom resource (CR) is created.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Configure the default Ingress Controller for your cluster to be internal by deleting and recreating it.

oc replace --force --wait --filename - <<EOF
apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  namespace: openshift-ingress-operator
  name: default
spec:
  endpointPublishingStrategy:
    type: LoadBalancerService
    loadBalancer:
      scope: Internal
EOF

$ oc replace --force --wait --filename - <<EOF
apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  namespace: openshift-ingress-operator
  name: default
spec:
  endpointPublishingStrategy:
    type: LoadBalancerService
    loadBalancer:
      scope: Internal
EOF

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7.8.11. Configuring the route admission policy

Administrators and application developers can run applications in multiple namespaces with the same domain name. This is for organizations where multiple teams develop microservices that are exposed on the same hostname.

Warning

Allowing claims across namespaces should only be enabled for clusters with trust between namespaces, otherwise a malicious user could take over a hostname. For this reason, the default admission policy disallows hostname claims across namespaces.

Prerequisites

Cluster administrator privileges.

Procedure

Edit the .spec.routeAdmission field of the ingresscontroller resource variable using the following command:

oc -n openshift-ingress-operator patch ingresscontroller/default --patch '{"spec":{"routeAdmission":{"namespaceOwnership":"InterNamespaceAllowed"}}}' --type=merge

$ oc -n openshift-ingress-operator patch ingresscontroller/default --patch '{"spec":{"routeAdmission":{"namespaceOwnership":"InterNamespaceAllowed"}}}' --type=merge

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Sample Ingress Controller configuration

spec:
  routeAdmission:
    namespaceOwnership: InterNamespaceAllowed
...

spec:
  routeAdmission:
    namespaceOwnership: InterNamespaceAllowed
...

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Tip

You can alternatively apply the following YAML to configure the route admission policy:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  routeAdmission:
    namespaceOwnership: InterNamespaceAllowed

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  routeAdmission:
    namespaceOwnership: InterNamespaceAllowed

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7.8.12. Using wildcard routes

The HAProxy Ingress Controller has support for wildcard routes. The Ingress Operator uses wildcardPolicy to configure the ROUTER_ALLOW_WILDCARD_ROUTES environment variable of the Ingress Controller.

The default behavior of the Ingress Controller is to admit routes with a wildcard policy of None, which is backwards compatible with existing IngressController resources.

Procedure

Configure the wildcard policy.

Use the following command to edit the IngressController resource:
```
oc edit IngressController
```
```
$ oc edit IngressController
```
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Under spec, set the wildcardPolicy field to WildcardsDisallowed or WildcardsAllowed:

spec:
  routeAdmission:
    wildcardPolicy: WildcardsDisallowed # or WildcardsAllowed

spec:
  routeAdmission:
    wildcardPolicy: WildcardsDisallowed # or WildcardsAllowed

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7.8.13. Using X-Forwarded headers

You configure the HAProxy Ingress Controller to specify a policy for how to handle HTTP headers including Forwarded and X-Forwarded-For. The Ingress Operator uses the HTTPHeaders field to configure the ROUTER_SET_FORWARDED_HEADERS environment variable of the Ingress Controller.

Procedure

Configure the HTTPHeaders field for the Ingress Controller.

Use the following command to edit the IngressController resource:
```
oc edit IngressController
```
```
$ oc edit IngressController
```
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Under spec, set the HTTPHeaders policy field to Append, Replace, IfNone, or Never:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  httpHeaders:
    forwardedHeaderPolicy: Append

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  httpHeaders:
    forwardedHeaderPolicy: Append

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Example use cases

As a cluster administrator, you can:

Configure an external proxy that injects the X-Forwarded-For header into each request before forwarding it to an Ingress Controller.
To configure the Ingress Controller to pass the header through unmodified, you specify the never policy. The Ingress Controller then never sets the headers, and applications receive only the headers that the external proxy provides.
Configure the Ingress Controller to pass the X-Forwarded-For header that your external proxy sets on external cluster requests through unmodified.
To configure the Ingress Controller to set the X-Forwarded-For header on internal cluster requests, which do not go through the external proxy, specify the if-none policy. If an HTTP request already has the header set through the external proxy, then the Ingress Controller preserves it. If the header is absent because the request did not come through the proxy, then the Ingress Controller adds the header.

As an application developer, you can:

Configure an application-specific external proxy that injects the X-Forwarded-For header.
To configure an Ingress Controller to pass the header through unmodified for an application’s Route, without affecting the policy for other Routes, add an annotation haproxy.router.openshift.io/set-forwarded-headers: if-none or haproxy.router.openshift.io/set-forwarded-headers: never on the Route for the application.
Note
You can set the haproxy.router.openshift.io/set-forwarded-headers annotation on a per route basis, independent from the globally set value for the Ingress Controller.

7.8.14. Enabling HTTP/2 Ingress connectivity

You can enable transparent end-to-end HTTP/2 connectivity in HAProxy. It allows application owners to make use of HTTP/2 protocol capabilities, including single connection, header compression, binary streams, and more.

You can enable HTTP/2 connectivity for an individual Ingress Controller or for the entire cluster.

To enable the use of HTTP/2 for the connection from the client to HAProxy, a route must specify a custom certificate. A route that uses the default certificate cannot use HTTP/2. This restriction is necessary to avoid problems from connection coalescing, where the client re-uses a connection for different routes that use the same certificate.

The connection from HAProxy to the application pod can use HTTP/2 only for re-encrypt routes and not for edge-terminated or insecure routes. This restriction is because HAProxy uses Application-Level Protocol Negotiation (ALPN), which is a TLS extension, to negotiate the use of HTTP/2 with the back-end. The implication is that end-to-end HTTP/2 is possible with passthrough and re-encrypt and not with insecure or edge-terminated routes.

Warning

Using WebSockets with a re-encrypt route and with HTTP/2 enabled on an Ingress Controller requires WebSocket support over HTTP/2. WebSockets over HTTP/2 is a feature of HAProxy 2.4, which is unsupported in OpenShift Container Platform at this time.

Important

For non-passthrough routes, the Ingress Controller negotiates its connection to the application independently of the connection from the client. This means a client may connect to the Ingress Controller and negotiate HTTP/1.1, and the Ingress Controller may then connect to the application, negotiate HTTP/2, and forward the request from the client HTTP/1.1 connection using the HTTP/2 connection to the application. This poses a problem if the client subsequently tries to upgrade its connection from HTTP/1.1 to the WebSocket protocol, because the Ingress Controller cannot forward WebSocket to HTTP/2 and cannot upgrade its HTTP/2 connection to WebSocket. Consequently, if you have an application that is intended to accept WebSocket connections, it must not allow negotiating the HTTP/2 protocol or else clients will fail to upgrade to the WebSocket protocol.

Procedure

Enable HTTP/2 on a single Ingress Controller.

To enable HTTP/2 on an Ingress Controller, enter the oc annotate command:

oc -n openshift-ingress-operator annotate ingresscontrollers/<ingresscontroller_name> ingress.operator.openshift.io/default-enable-http2=true

$ oc -n openshift-ingress-operator annotate ingresscontrollers/<ingresscontroller_name> ingress.operator.openshift.io/default-enable-http2=true

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Replace <ingresscontroller_name> with the name of the Ingress Controller to annotate.

Enable HTTP/2 on the entire cluster.

To enable HTTP/2 for the entire cluster, enter the oc annotate command:

oc annotate ingresses.config/cluster ingress.operator.openshift.io/default-enable-http2=true

$ oc annotate ingresses.config/cluster ingress.operator.openshift.io/default-enable-http2=true

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Tip

You can alternatively apply the following YAML to add the annotation:

apiVersion: config.openshift.io/v1
kind: Ingress
metadata:
  name: cluster
  annotations:
    ingress.operator.openshift.io/default-enable-http2: "true"

apiVersion: config.openshift.io/v1
kind: Ingress
metadata:
  name: cluster
  annotations:
    ingress.operator.openshift.io/default-enable-http2: "true"

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7.8.15. Configuring the PROXY protocol for an Ingress Controller

A cluster administrator can configure the PROXY protocol when an Ingress Controller uses either the HostNetwork or NodePortService endpoint publishing strategy types. The PROXY protocol enables the load balancer to preserve the original client addresses for connections that the Ingress Controller receives. The original client addresses are useful for logging, filtering, and injecting HTTP headers. In the default configuration, the connections that the Ingress Controller receives only contain the source address that is associated with the load balancer.

This feature is not supported in cloud deployments. This restriction is because when OpenShift Container Platform runs in a cloud platform, and an IngressController specifies that a service load balancer should be used, the Ingress Operator configures the load balancer service and enables the PROXY protocol based on the platform requirement for preserving source addresses.

Important

You must configure both OpenShift Container Platform and the external load balancer to either use the PROXY protocol or to use TCP.

Warning

The PROXY protocol is unsupported for the default Ingress Controller with installer-provisioned clusters on non-cloud platforms that use a Keepalived Ingress VIP.

Prerequisites

You created an Ingress Controller.

Procedure

Edit the Ingress Controller resource:

oc -n openshift-ingress-operator edit ingresscontroller/default

$ oc -n openshift-ingress-operator edit ingresscontroller/default

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Set the PROXY configuration:

If your Ingress Controller uses the hostNetwork endpoint publishing strategy type, set the spec.endpointPublishingStrategy.hostNetwork.protocol subfield to PROXY:

Sample hostNetwork configuration to PROXY

  spec:
    endpointPublishingStrategy:
      hostNetwork:
        protocol: PROXY
      type: HostNetwork

  spec:
    endpointPublishingStrategy:
      hostNetwork:
        protocol: PROXY
      type: HostNetwork

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If your Ingress Controller uses the NodePortService endpoint publishing strategy type, set the spec.endpointPublishingStrategy.nodePort.protocol subfield to PROXY:

Sample nodePort configuration to PROXY

  spec:
    endpointPublishingStrategy:
      nodePort:
        protocol: PROXY
      type: NodePortService

  spec:
    endpointPublishingStrategy:
      nodePort:
        protocol: PROXY
      type: NodePortService

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7.8.16. Specifying an alternative cluster domain using the appsDomain option

As a cluster administrator, you can specify an alternative to the default cluster domain for user-created routes by configuring the appsDomain field. The appsDomain field is an optional domain for OpenShift Container Platform to use instead of the default, which is specified in the domain field. If you specify an alternative domain, it overrides the default cluster domain for the purpose of determining the default host for a new route.

For example, you can use the DNS domain for your company as the default domain for routes and ingresses for applications running on your cluster.

Prerequisites

You deployed an OpenShift Container Platform cluster.
You installed the oc command-line interface.

Procedure

Configure the appsDomain field by specifying an alternative default domain for user-created routes.
1. Edit the ingress cluster resource:
  $ oc edit ingresses.config/cluster -o yaml
  Copy to Clipboard
2. Edit the YAML file:
  Sample appsDomain configuration to test.example.com
  apiVersion: config.openshift.io/v1 kind: Ingress metadata: name: cluster spec: domain: apps.example.com
  1
  appsDomain: <test.example.com>
  2
  
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  1
  Specifies the default domain. You cannot modify the default domain after installation.
  2
  Optional: Domain for OpenShift Container Platform infrastructure to use for application routes. Instead of the default prefix, apps, you can use an alternative prefix like test.

Verify that an existing route contains the domain name specified in the appsDomain field by exposing the route and verifying the route domain change:

Note

Wait for the openshift-apiserver finish rolling updates before exposing the route.

Expose the route:

oc expose service hello-openshift

$ oc expose service hello-openshift
route.route.openshift.io/hello-openshift exposed

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Example output:

oc get routes

$ oc get routes
NAME              HOST/PORT                                   PATH   SERVICES          PORT       TERMINATION   WILDCARD
hello-openshift   hello_openshift-<my_project>.test.example.com
hello-openshift   8080-tcp                 None

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7.8.17. Converting HTTP header case

HAProxy lowercases HTTP header names by default; for example, changing Host: xyz.com to host: xyz.com. If legacy applications are sensitive to the capitalization of HTTP header names, use the Ingress Controller spec.httpHeaders.headerNameCaseAdjustments API field for a solution to accommodate legacy applications until they can be fixed.

Important

OpenShift Container Platform includes HAProxy 2.2. If you want to update to this version of the web-based load balancer, ensure that you add the spec.httpHeaders.headerNameCaseAdjustments section to your cluster’s configuration file.

As a cluster administrator, you can convert the HTTP header case by entering the oc patch command or by setting the HeaderNameCaseAdjustments field in the Ingress Controller YAML file.

Prerequisites

You have installed the OpenShift CLI (oc).
You have access to the cluster as a user with the cluster-admin role.

Procedure

Capitalize an HTTP header by using the oc patch command.

Change the HTTP header from host to Host by running the following command:

oc -n openshift-ingress-operator patch ingresscontrollers/default --type=merge --patch='{"spec":{"httpHeaders":{"headerNameCaseAdjustments":["Host"]}}}'

$ oc -n openshift-ingress-operator patch ingresscontrollers/default --type=merge --patch='{"spec":{"httpHeaders":{"headerNameCaseAdjustments":["Host"]}}}'

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Create a Route resource YAML file so that the annotation can be applied to the application.

Example of a route named my-application

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/h1-adjust-case: true 
  name: <application_name>
  namespace: <application_name>
# ...

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/h1-adjust-case: true

1


  name: <application_name>
  namespace: <application_name>
# ...

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1: Set haproxy.router.openshift.io/h1-adjust-case so that the Ingress Controller can adjust the host request header as specified.

Specify adjustments by configuring the HeaderNameCaseAdjustments field in the Ingress Controller YAML configuration file.

The following example Ingress Controller YAML file adjusts the host header to Host for HTTP/1 requests to appropriately annotated routes:

Example Ingress Controller YAML

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  httpHeaders:
    headerNameCaseAdjustments:
    - Host

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  httpHeaders:
    headerNameCaseAdjustments:
    - Host

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The following example route enables HTTP response header name case adjustments by using the haproxy.router.openshift.io/h1-adjust-case annotation:

Example route YAML

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/h1-adjust-case: true 
  name: my-application
  namespace: my-application
spec:
  to:
    kind: Service
    name: my-application

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/h1-adjust-case: true

1


  name: my-application
  namespace: my-application
spec:
  to:
    kind: Service
    name: my-application

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1: Set haproxy.router.openshift.io/h1-adjust-case to true.

7.8.18. Using router compression

You configure the HAProxy Ingress Controller to specify router compression globally for specific MIME types. You can use the mimeTypes variable to define the formats of MIME types to which compression is applied. The types are: application, image, message, multipart, text, video, or a custom type prefaced by "X-". To see the full notation for MIME types and subtypes, see RFC1341.

Note

Memory allocated for compression can affect the max connections. Additionally, compression of large buffers can cause latency, like heavy regex or long lists of regex.

Not all MIME types benefit from compression, but HAProxy still uses resources to try to compress if instructed to. Generally, text formats, such as html, css, and js, formats benefit from compression, but formats that are already compressed, such as image, audio, and video, benefit little in exchange for the time and resources spent on compression.

Procedure

Configure the httpCompression field for the Ingress Controller.

Use the following command to edit the IngressController resource:

oc edit -n openshift-ingress-operator ingresscontrollers/default

$ oc edit -n openshift-ingress-operator ingresscontrollers/default

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Under spec, set the httpCompression policy field to mimeTypes and specify a list of MIME types that should have compression applied:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  httpCompression:
    mimeTypes:
    - "text/html"
    - "text/css; charset=utf-8"
    - "application/json"
   ...

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  httpCompression:
    mimeTypes:
    - "text/html"
    - "text/css; charset=utf-8"
    - "application/json"
   ...

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7.8.19. Exposing router metrics

You can expose the HAProxy router metrics by default in Prometheus format on the default stats port, 1936. The external metrics collection and aggregation systems such as Prometheus can access the HAProxy router metrics. You can view the HAProxy router metrics in a browser in the HTML and comma separated values (CSV) format.

Prerequisites

You configured your firewall to access the default stats port, 1936.

Procedure

Get the router pod name by running the following command:

oc get pods -n openshift-ingress

$ oc get pods -n openshift-ingress

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Example output

NAME                              READY   STATUS    RESTARTS   AGE
router-default-76bfffb66c-46qwp   1/1     Running   0          11h

NAME                              READY   STATUS    RESTARTS   AGE
router-default-76bfffb66c-46qwp   1/1     Running   0          11h

Copy to Clipboard

Get the router’s username and password, which the router pod stores in the /var/lib/haproxy/conf/metrics-auth/statsUsername and /var/lib/haproxy/conf/metrics-auth/statsPassword files:
1. Get the username by running the following command:
  $ oc rsh <router_pod_name> cat metrics-auth/statsUsername
  Copy to Clipboard
2. Get the password by running the following command:
  $ oc rsh <router_pod_name> cat metrics-auth/statsPassword
  Copy to Clipboard
Get the router IP and metrics certificates by running the following command:
```
oc describe pod <router_pod>
```
```
$ oc describe pod <router_pod>
```
Copy to Clipboard

Get the raw statistics in Prometheus format by running the following command:

curl -u <user>:<password> http://<router_IP>:<stats_port>/metrics

$ curl -u <user>:<password> http://<router_IP>:<stats_port>/metrics

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Access the metrics securely by running the following command:

curl -u user:password https://<router_IP>:<stats_port>/metrics -k

$ curl -u user:password https://<router_IP>:<stats_port>/metrics -k

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Access the default stats port, 1936, by running the following command:

curl -u <user>:<password> http://<router_IP>:<stats_port>/metrics

$ curl -u <user>:<password> http://<router_IP>:<stats_port>/metrics

Copy to Clipboard

Example 7.1. Example output

...
# HELP haproxy_backend_connections_total Total number of connections.
# TYPE haproxy_backend_connections_total gauge
haproxy_backend_connections_total{backend="http",namespace="default",route="hello-route"} 0
haproxy_backend_connections_total{backend="http",namespace="default",route="hello-route-alt"} 0
haproxy_backend_connections_total{backend="http",namespace="default",route="hello-route01"} 0
...
# HELP haproxy_exporter_server_threshold Number of servers tracked and the current threshold value.
# TYPE haproxy_exporter_server_threshold gauge
haproxy_exporter_server_threshold{type="current"} 11
haproxy_exporter_server_threshold{type="limit"} 500
...
# HELP haproxy_frontend_bytes_in_total Current total of incoming bytes.
# TYPE haproxy_frontend_bytes_in_total gauge
haproxy_frontend_bytes_in_total{frontend="fe_no_sni"} 0
haproxy_frontend_bytes_in_total{frontend="fe_sni"} 0
haproxy_frontend_bytes_in_total{frontend="public"} 119070
...
# HELP haproxy_server_bytes_in_total Current total of incoming bytes.
# TYPE haproxy_server_bytes_in_total gauge
haproxy_server_bytes_in_total{namespace="",pod="",route="",server="fe_no_sni",service=""} 0
haproxy_server_bytes_in_total{namespace="",pod="",route="",server="fe_sni",service=""} 0
haproxy_server_bytes_in_total{namespace="default",pod="docker-registry-5-nk5fz",route="docker-registry",server="10.130.0.89:5000",service="docker-registry"} 0
haproxy_server_bytes_in_total{namespace="default",pod="hello-rc-vkjqx",route="hello-route",server="10.130.0.90:8080",service="hello-svc-1"} 0
...

...
# HELP haproxy_backend_connections_total Total number of connections.
# TYPE haproxy_backend_connections_total gauge
haproxy_backend_connections_total{backend="http",namespace="default",route="hello-route"} 0
haproxy_backend_connections_total{backend="http",namespace="default",route="hello-route-alt"} 0
haproxy_backend_connections_total{backend="http",namespace="default",route="hello-route01"} 0
...
# HELP haproxy_exporter_server_threshold Number of servers tracked and the current threshold value.
# TYPE haproxy_exporter_server_threshold gauge
haproxy_exporter_server_threshold{type="current"} 11
haproxy_exporter_server_threshold{type="limit"} 500
...
# HELP haproxy_frontend_bytes_in_total Current total of incoming bytes.
# TYPE haproxy_frontend_bytes_in_total gauge
haproxy_frontend_bytes_in_total{frontend="fe_no_sni"} 0
haproxy_frontend_bytes_in_total{frontend="fe_sni"} 0
haproxy_frontend_bytes_in_total{frontend="public"} 119070
...
# HELP haproxy_server_bytes_in_total Current total of incoming bytes.
# TYPE haproxy_server_bytes_in_total gauge
haproxy_server_bytes_in_total{namespace="",pod="",route="",server="fe_no_sni",service=""} 0
haproxy_server_bytes_in_total{namespace="",pod="",route="",server="fe_sni",service=""} 0
haproxy_server_bytes_in_total{namespace="default",pod="docker-registry-5-nk5fz",route="docker-registry",server="10.130.0.89:5000",service="docker-registry"} 0
haproxy_server_bytes_in_total{namespace="default",pod="hello-rc-vkjqx",route="hello-route",server="10.130.0.90:8080",service="hello-svc-1"} 0
...

Copy to Clipboard

Launch the stats window by entering the following URL in a browser:

http://<user>:<password>@<router_IP>:<stats_port>

http://<user>:<password>@<router_IP>:<stats_port>

Copy to Clipboard

Optional: Get the stats in CSV format by entering the following URL in a browser:

http://<user>:<password>@<router_ip>:1936/metrics;csv

http://<user>:<password>@<router_ip>:1936/metrics;csv

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7.8.20. Customizing HAProxy error code response pages

As a cluster administrator, you can specify a custom error code response page for either 503, 404, or both error pages. The HAProxy router serves a 503 error page when the application pod is not running or a 404 error page when the requested URL does not exist. For example, if you customize the 503 error code response page, then the page is served when the application pod is not running, and the default 404 error code HTTP response page is served by the HAProxy router for an incorrect route or a non-existing route.

Custom error code response pages are specified in a config map then patched to the Ingress Controller. The config map keys have two available file names as follows: error-page-503.http and error-page-404.http.

Custom HTTP error code response pages must follow the HAProxy HTTP error page configuration guidelines. Here is an example of the default OpenShift Container Platform HAProxy router http 503 error code response page. You can use the default content as a template for creating your own custom page.

By default, the HAProxy router serves only a 503 error page when the application is not running or when the route is incorrect or non-existent. This default behavior is the same as the behavior on OpenShift Container Platform 4.8 and earlier. If a config map for the customization of an HTTP error code response is not provided, and you are using a custom HTTP error code response page, the router serves a default 404 or 503 error code response page.

Note

If you use the OpenShift Container Platform default 503 error code page as a template for your customizations, the headers in the file require an editor that can use CRLF line endings.

Procedure

Create a config map named my-custom-error-code-pages in the openshift-config namespace:
```
oc -n openshift-config create configmap my-custom-error-code-pages \
--from-file=error-page-503.http \
--from-file=error-page-404.http
```
```
$ oc -n openshift-config create configmap my-custom-error-code-pages \
--from-file=error-page-503.http \
--from-file=error-page-404.http
```
Copy to Clipboard
Important
If you do not specify the correct format for the custom error code response page, a router pod outage occurs. To resolve this outage, you must delete or correct the config map and delete the affected router pods so they can be recreated with the correct information.
Patch the Ingress Controller to reference the my-custom-error-code-pages config map by name:
```
oc patch -n openshift-ingress-operator ingresscontroller/default --patch '{"spec":{"httpErrorCodePages":{"name":"my-custom-error-code-pages"}}}' --type=merge
```
```
$ oc patch -n openshift-ingress-operator ingresscontroller/default --patch '{"spec":{"httpErrorCodePages":{"name":"my-custom-error-code-pages"}}}' --type=merge
```
Copy to Clipboard
The Ingress Operator copies the my-custom-error-code-pages config map from the openshift-config namespace to the openshift-ingress namespace. The Operator names the config map according to the pattern, <your_ingresscontroller_name>-errorpages, in the openshift-ingress namespace.

Display the copy:

oc get cm default-errorpages -n openshift-ingress

$ oc get cm default-errorpages -n openshift-ingress

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Example output

NAME                       DATA   AGE
default-errorpages         2      25s

NAME                       DATA   AGE
default-errorpages         2      25s

1

Copy to Clipboard

1: The example config map name is default-errorpages because the default Ingress Controller custom resource (CR) was patched.

Confirm that the config map containing the custom error response page mounts on the router volume where the config map key is the filename that has the custom HTTP error code response:

For 503 custom HTTP custom error code response:

oc -n openshift-ingress rsh <router_pod> cat /var/lib/haproxy/conf/error_code_pages/error-page-503.http

$ oc -n openshift-ingress rsh <router_pod> cat /var/lib/haproxy/conf/error_code_pages/error-page-503.http

Copy to Clipboard

For 404 custom HTTP custom error code response:

oc -n openshift-ingress rsh <router_pod> cat /var/lib/haproxy/conf/error_code_pages/error-page-404.http

$ oc -n openshift-ingress rsh <router_pod> cat /var/lib/haproxy/conf/error_code_pages/error-page-404.http

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Verification

Verify your custom error code HTTP response:

Create a test project and application:

oc new-project test-ingress

 $ oc new-project test-ingress

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oc new-app django-psql-example

$ oc new-app django-psql-example

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For 503 custom http error code response:
1. Stop all the pods for the application.
2. Run the following curl command or visit the route hostname in the browser:
  $ curl -vk <route_hostname>
  Copy to Clipboard
For 404 custom http error code response:
1. Visit a non-existent route or an incorrect route.
2. Run the following curl command or visit the route hostname in the browser:
  $ curl -vk <route_hostname>
  Copy to Clipboard

Check if the errorfile attribute is properly in the haproxy.config file:

oc -n openshift-ingress rsh <router> cat /var/lib/haproxy/conf/haproxy.config | grep errorfile

$ oc -n openshift-ingress rsh <router> cat /var/lib/haproxy/conf/haproxy.config | grep errorfile

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7.8.21. Setting the Ingress Controller maximum connections

A cluster administrator can set the maximum number of simultaneous connections for OpenShift router deployments. You can patch an existing Ingress Controller to increase the maximum number of connections.

Prerequisites

The following assumes that you already created an Ingress Controller

Procedure

Update the Ingress Controller to change the maximum number of connections for HAProxy:
```
oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge -p '{"spec":{"tuningOptions": {"maxConnections": 7500}}}'
```
```
$ oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge -p '{"spec":{"tuningOptions": {"maxConnections": 7500}}}'
```
Copy to Clipboard
Warning
If you set the spec.tuningOptions.maxConnections value greater than the current operating system limit, the HAProxy process will not start. See the table in the "Ingress Controller configuration parameters" section for more information about this parameter.

Chapter 8. Ingress Node Firewall Operator in OpenShift Container Platform

The Ingress Node Firewall Operator provides a stateless, eBPF-based firewall for managing node-level ingress traffic in OpenShift Container Platform.

8.1. Ingress Node Firewall Operator

The Ingress Node Firewall Operator provides ingress firewall rules at a node level by deploying the daemon set to nodes you specify and manage in the firewall configurations. To deploy the daemon set, you create an IngressNodeFirewallConfig custom resource (CR). The Operator applies the IngressNodeFirewallConfig CR to create ingress node firewall daemon set daemon, which run on all nodes that match the nodeSelector.

You configure rules of the IngressNodeFirewall CR and apply them to clusters using the nodeSelector and setting values to "true".

Important

The Ingress Node Firewall Operator supports only stateless firewall rules.

The maximum transmission units (MTU) parameter is 4Kb (kilobytes) in OpenShift Container Platform 4.13.

Network interface controllers (NICs) that do not support native XDP drivers will run at a lower performance.

Ingress Node Firewall Operator is not supported on Amazon Web Services (AWS) with the default OpenShift installation or on Red Hat OpenShift Service on AWS (ROSA). For more information on Red Hat OpenShift Service on AWS support and ingress, see Ingress Operator in Red Hat OpenShift Service on AWS.

8.2. Installing the Ingress Node Firewall Operator

As a cluster administrator, you can install the Ingress Node Firewall Operator by using the OpenShift Container Platform CLI or the web console.

8.2.1. Installing the Ingress Node Firewall Operator using the CLI

As a cluster administrator, you can install the Operator using the CLI.

Prerequisites

You have installed the OpenShift CLI (oc).
You have an account with administrator privileges.

Procedure

To create the openshift-ingress-node-firewall namespace, enter the following command:

cat << EOF| oc create -f -
apiVersion: v1
kind: Namespace
metadata:
  labels:
    pod-security.kubernetes.io/enforce: privileged
    pod-security.kubernetes.io/enforce-version: v1.24
  name: openshift-ingress-node-firewall
EOF

$ cat << EOF| oc create -f -
apiVersion: v1
kind: Namespace
metadata:
  labels:
    pod-security.kubernetes.io/enforce: privileged
    pod-security.kubernetes.io/enforce-version: v1.24
  name: openshift-ingress-node-firewall
EOF

Copy to Clipboard

To create an OperatorGroup CR, enter the following command:

cat << EOF| oc create -f -
apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: ingress-node-firewall-operators
  namespace: openshift-ingress-node-firewall
EOF

$ cat << EOF| oc create -f -
apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: ingress-node-firewall-operators
  namespace: openshift-ingress-node-firewall
EOF

Copy to Clipboard

Subscribe to the Ingress Node Firewall Operator.

To create a Subscription CR for the Ingress Node Firewall Operator, enter the following command:

cat << EOF| oc create -f -
apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: ingress-node-firewall-sub
  namespace: openshift-ingress-node-firewall
spec:
  name: ingress-node-firewall
  channel: stable
  source: redhat-operators
  sourceNamespace: openshift-marketplace
EOF

$ cat << EOF| oc create -f -
apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: ingress-node-firewall-sub
  namespace: openshift-ingress-node-firewall
spec:
  name: ingress-node-firewall
  channel: stable
  source: redhat-operators
  sourceNamespace: openshift-marketplace
EOF

Copy to Clipboard

To verify that the Operator is installed, enter the following command:

oc get ip -n openshift-ingress-node-firewall

$ oc get ip -n openshift-ingress-node-firewall

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Example output

NAME            CSV                                         APPROVAL    APPROVED
install-5cvnz   ingress-node-firewall.4.13.0-202211122336   Automatic   true

NAME            CSV                                         APPROVAL    APPROVED
install-5cvnz   ingress-node-firewall.4.13.0-202211122336   Automatic   true

Copy to Clipboard

To verify the version of the Operator, enter the following command:

oc get csv -n openshift-ingress-node-firewall

$ oc get csv -n openshift-ingress-node-firewall

Copy to Clipboard

Example output

NAME                                        DISPLAY                          VERSION               REPLACES                                    PHASE
ingress-node-firewall.4.13.0-202211122336   Ingress Node Firewall Operator   4.13.0-202211122336   ingress-node-firewall.4.13.0-202211102047   Succeeded

NAME                                        DISPLAY                          VERSION               REPLACES                                    PHASE
ingress-node-firewall.4.13.0-202211122336   Ingress Node Firewall Operator   4.13.0-202211122336   ingress-node-firewall.4.13.0-202211102047   Succeeded

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8.2.2. Installing the Ingress Node Firewall Operator using the web console

As a cluster administrator, you can install the Operator using the web console.

Prerequisites

You have installed the OpenShift CLI (oc).
You have an account with administrator privileges.

Procedure

Install the Ingress Node Firewall Operator:
1. In the OpenShift Container Platform web console, click Operators → OperatorHub.
2. Select Ingress Node Firewall Operator from the list of available Operators, and then click Install.
3. On the Install Operator page, under Installed Namespace, select Operator recommended Namespace.
4. Click Install.
Verify that the Ingress Node Firewall Operator is installed successfully:
1. Navigate to the Operators → Installed Operators page.
2. Ensure that Ingress Node Firewall Operator is listed in the openshift-ingress-node-firewall project with a Status of InstallSucceeded.
  Note
  During installation an Operator might display a Failed status. If the installation later succeeds with an InstallSucceeded message, you can ignore the Failed message.
  If the Operator does not have a Status of InstallSucceeded, troubleshoot using the following steps:
  - Inspect the Operator Subscriptions and Install Plans tabs for any failures or errors under Status.
  - Navigate to the Workloads → Pods page and check the logs for pods in the openshift-ingress-node-firewall project.
  - Check the namespace of the YAML file. If the annotation is missing, you can add the annotation workload.openshift.io/allowed=management to the Operator namespace with the following command:
    
    $ oc annotate ns/openshift-ingress-node-firewall workload.openshift.io/allowed=management
    
    Copy to Clipboard
    
    Note
    For single-node OpenShift clusters, the openshift-ingress-node-firewall namespace requires the workload.openshift.io/allowed=management annotation.

8.3. Deploying Ingress Node Firewall Operator

Prerequisite

The Ingress Node Firewall Operator is installed.

Procedure

To deploy the Ingress Node Firewall Operator, create a IngressNodeFirewallConfig custom resource that will deploy the Operator’s daemon set. You can deploy one or multiple IngressNodeFirewall CRDs to nodes by applying firewall rules.

Create the IngressNodeFirewallConfig inside the openshift-ingress-node-firewall namespace named ingressnodefirewallconfig.
Run the following command to deploy Ingress Node Firewall Operator rules:
```
oc apply -f rule.yaml
```
```
$ oc apply -f rule.yaml
```
Copy to Clipboard

8.3.1. Ingress Node Firewall configuration object

The fields for the Ingress Node Firewall configuration object are described in the following table:

Table 8.1. Ingress Node Firewall Configuration object
Field	Type	Description
`metadata.name`	`string`	The name of the CR object. The name of the firewall rules object must be `ingressnodefirewallconfig`.
`metadata.namespace`	`string`	Namespace for the Ingress Firewall Operator CR object. The `IngressNodeFirewallConfig` CR must be created inside the `openshift-ingress-node-firewall` namespace.
`spec.nodeSelector`	`string`	A node selection constraint used to target nodes through specified node labels. For example: `spec: nodeSelector: node-role.kubernetes.io/worker: ""` Copy to Clipboard Note One label used in `nodeSelector` must match a label on the nodes in order for the daemon set to start. For example, if the node labels `node-role.kubernetes.io/worker` and `node-type.kubernetes.io/vm` are applied to a node, then at least one label must be set using `nodeSelector` for the daemon set to start.

Note

The Operator consumes the CR and creates an ingress node firewall daemon set on all the nodes that match the nodeSelector.

Ingress Node Firewall Operator example configuration

A complete Ingress Node Firewall Configuration is specified in the following example:

Example Ingress Node Firewall Configuration object

apiVersion: ingressnodefirewall.openshift.io/v1alpha1
kind: IngressNodeFirewallConfig
metadata:
  name: ingressnodefirewallconfig
  namespace: openshift-ingress-node-firewall
spec:
  nodeSelector:
    node-role.kubernetes.io/worker: ""

apiVersion: ingressnodefirewall.openshift.io/v1alpha1
kind: IngressNodeFirewallConfig
metadata:
  name: ingressnodefirewallconfig
  namespace: openshift-ingress-node-firewall
spec:
  nodeSelector:
    node-role.kubernetes.io/worker: ""

Copy to Clipboard

Note

The Operator consumes the CR and creates an ingress node firewall daemon set on all the nodes that match the nodeSelector.

8.3.2. Ingress Node Firewall rules object

The fields for the Ingress Node Firewall rules object are described in the following table:

Table 8.2. Ingress Node Firewall rules object
Field	Type	Description
`metadata.name`	`string`	The name of the CR object.
`interfaces`	`array`	The fields for this object specify the interfaces to apply the firewall rules to. For example, `- en0` and `- en1`.
`nodeSelector`	`array`	You can use `nodeSelector` to select the nodes to apply the firewall rules to. Set the value of your named `nodeselector` labels to `true` to apply the rule.
`ingress`	`object`	`ingress` allows you to configure the rules that allow outside access to the services on your cluster.

Ingress object configuration

The values for the ingress object are defined in the following table:

Table 8.3. ingress object
Field	Type	Description
`sourceCIDRs`	`array`	Allows you to set the CIDR block. You can configure multiple CIDRs from different address families. Note Different CIDRs allow you to use the same order rule. In the case that there are multiple `IngressNodeFirewall` objects for the same nodes and interfaces with overlapping CIDRs, the `order` field will specify which rule is applied first. Rules are applied in ascending order.
`rules`	`array`	Ingress firewall `rules.order` objects are ordered starting at `1` for each `source.CIDR` with up to 100 rules per CIDR. Lower order rules are executed first. `rules.protocolConfig.protocol` supports the following protocols: TCP, UDP, SCTP, ICMP and ICMPv6. ICMP and ICMPv6 rules can match against ICMP and ICMPv6 types or codes. TCP, UDP, and SCTP rules can match against a single destination port or a range of ports using `<start : end-1>` format. Set `rules.action` to `allow` to apply the rule or `deny` to disallow the rule. Note Ingress firewall rules are verified using a verification webhook that blocks any invalid configuration. The verification webhook prevents you from blocking any critical cluster services such as the API server or SSH.

Ingress Node Firewall rules object example

A complete Ingress Node Firewall configuration is specified in the following example:

Example Ingress Node Firewall configuration

apiVersion: ingressnodefirewall.openshift.io/v1alpha1
kind: IngressNodeFirewall
metadata:
  name: ingressnodefirewall
spec:
  interfaces:
  - eth0
  nodeSelector:
    matchLabels:
      <ingress_firewall_label_name>: <label_value> 
  ingress:
  - sourceCIDRs:
       - 172.16.0.0/12
    rules:
    - order: 10
      protocolConfig:
        protocol: ICMP
        icmp:
          icmpType: 8 #ICMP Echo request
      action: Deny
    - order: 20
      protocolConfig:
        protocol: TCP
        tcp:
          ports: "8000-9000"
      action: Deny
  - sourceCIDRs:
       - fc00:f853:ccd:e793::0/64
    rules:
    - order: 10
      protocolConfig:
        protocol: ICMPv6
        icmpv6:
          icmpType: 128 #ICMPV6 Echo request
      action: Deny

apiVersion: ingressnodefirewall.openshift.io/v1alpha1
kind: IngressNodeFirewall
metadata:
  name: ingressnodefirewall
spec:
  interfaces:
  - eth0
  nodeSelector:
    matchLabels:
      <ingress_firewall_label_name>: <label_value>

1


  ingress:
  - sourceCIDRs:
       - 172.16.0.0/12
    rules:
    - order: 10
      protocolConfig:
        protocol: ICMP
        icmp:
          icmpType: 8 #ICMP Echo request
      action: Deny
    - order: 20
      protocolConfig:
        protocol: TCP
        tcp:
          ports: "8000-9000"
      action: Deny
  - sourceCIDRs:
       - fc00:f853:ccd:e793::0/64
    rules:
    - order: 10
      protocolConfig:
        protocol: ICMPv6
        icmpv6:
          icmpType: 128 #ICMPV6 Echo request
      action: Deny

Copy to Clipboard

1: A <label_name> and a <label_value> must exist on the node and must match the nodeselector label and value applied to the nodes you want the ingressfirewallconfig CR to run on. The <label_value> can be true or false. By using nodeSelector labels, you can target separate groups of nodes to apply different rules to using the ingressfirewallconfig CR.

Zero trust Ingress Node Firewall rules object example

Zero trust Ingress Node Firewall rules can provide additional security to multi-interface clusters. For example, you can use zero trust Ingress Node Firewall rules to drop all traffic on a specific interface except for SSH.

A complete configuration of a zero trust Ingress Node Firewall rule set is specified in the following example:

Important

Users need to add all ports their application will use to their allowlist in the following case to ensure proper functionality.

Example zero trust Ingress Node Firewall rules

apiVersion: ingressnodefirewall.openshift.io/v1alpha1
kind: IngressNodeFirewall
metadata:
 name: ingressnodefirewall-zero-trust
spec:
 interfaces:
 - eth1 
 nodeSelector:
   matchLabels:
     <ingress_firewall_label_name>: <label_value> 
 ingress:
 - sourceCIDRs:
      - 0.0.0.0/0 
   rules:
   - order: 10
     protocolConfig:
       protocol: TCP
       tcp:
         ports: 22
     action: Allow
   - order: 20
     action: Deny

apiVersion: ingressnodefirewall.openshift.io/v1alpha1
kind: IngressNodeFirewall
metadata:
 name: ingressnodefirewall-zero-trust
spec:
 interfaces:
 - eth1

1


 nodeSelector:
   matchLabels:
     <ingress_firewall_label_name>: <label_value>

2


 ingress:
 - sourceCIDRs:
      - 0.0.0.0/0

3


   rules:
   - order: 10
     protocolConfig:
       protocol: TCP
       tcp:
         ports: 22
     action: Allow
   - order: 20
     action: Deny

4

Copy to Clipboard

1: Network-interface cluster
2: The <label_name> and <label_value> needs to match the nodeSelector label and value applied to the specific nodes with which you wish to apply the ingressfirewallconfig CR.
3: 0.0.0.0/0 set to match any CIDR
4: action set to Deny

8.4. Viewing Ingress Node Firewall Operator rules

Procedure

Run the following command to view all current rules :
```
oc get ingressnodefirewall
```
```
$ oc get ingressnodefirewall
```
Copy to Clipboard
Choose one of the returned <resource> names and run the following command to view the rules or configs:
```
oc get <resource> <name> -o yaml
```
```
$ oc get <resource> <name> -o yaml
```
Copy to Clipboard

8.5. Troubleshooting the Ingress Node Firewall Operator

Run the following command to list installed Ingress Node Firewall custom resource definitions (CRD):

oc get crds | grep ingressnodefirewall

$ oc get crds | grep ingressnodefirewall

Copy to Clipboard

Example output

NAME               READY   UP-TO-DATE   AVAILABLE   AGE
ingressnodefirewallconfigs.ingressnodefirewall.openshift.io       2022-08-25T10:03:01Z
ingressnodefirewallnodestates.ingressnodefirewall.openshift.io    2022-08-25T10:03:00Z
ingressnodefirewalls.ingressnodefirewall.openshift.io             2022-08-25T10:03:00Z

NAME               READY   UP-TO-DATE   AVAILABLE   AGE
ingressnodefirewallconfigs.ingressnodefirewall.openshift.io       2022-08-25T10:03:01Z
ingressnodefirewallnodestates.ingressnodefirewall.openshift.io    2022-08-25T10:03:00Z
ingressnodefirewalls.ingressnodefirewall.openshift.io             2022-08-25T10:03:00Z

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Run the following command to view the state of the Ingress Node Firewall Operator:

oc get pods -n openshift-ingress-node-firewall

$ oc get pods -n openshift-ingress-node-firewall

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Example output

NAME                                       READY  STATUS         RESTARTS  AGE
ingress-node-firewall-controller-manager   2/2    Running        0         5d21h
ingress-node-firewall-daemon-pqx56         3/3    Running        0         5d21h

NAME                                       READY  STATUS         RESTARTS  AGE
ingress-node-firewall-controller-manager   2/2    Running        0         5d21h
ingress-node-firewall-daemon-pqx56         3/3    Running        0         5d21h

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The following fields provide information about the status of the Operator: READY, STATUS, AGE, and RESTARTS. The STATUS field is Running when the Ingress Node Firewall Operator is deploying a daemon set to the assigned nodes.

Run the following command to collect all ingress firewall node pods' logs:
```
oc adm must-gather – gather_ingress_node_firewall
```
```
$ oc adm must-gather – gather_ingress_node_firewall
```
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The logs are available in the sos node’s report containing eBPF bpftool outputs at /sos_commands/ebpf. These reports include lookup tables used or updated as the ingress firewall XDP handles packet processing, updates statistics, and emits events.

Chapter 9. Configuring an Ingress Controller for manual DNS Management

As a cluster administrator, when you create an Ingress Controller, the Operator manages the DNS records automatically. This has some limitations when the required DNS zone is different from the cluster DNS zone or when the DNS zone is hosted outside the cloud provider.

As a cluster administrator, you can configure an Ingress Controller to stop automatic DNS management and start manual DNS management. Set dnsManagementPolicy to specify when it should be automatically or manually managed.

When you change an Ingress Controller from Managed to Unmanaged DNS management policy, the Operator does not clean up the previous wildcard DNS record provisioned on the cloud. When you change an Ingress Controller from Unmanaged to Managed DNS management policy, the Operator attempts to create the DNS record on the cloud provider if it does not exist or updates the DNS record if it already exists.

Important

When you set dnsManagementPolicy to unmanaged, you have to manually manage the lifecycle of the wildcard DNS record on the cloud provider.

9.1. `Managed` DNS management policy

The Managed DNS management policy for Ingress Controllers ensures that the lifecycle of the wildcard DNS record on the cloud provider is automatically managed by the Operator.

9.2. `Unmanaged` DNS management policy

The Unmanaged DNS management policy for Ingress Controllers ensures that the lifecycle of the wildcard DNS record on the cloud provider is not automatically managed, instead it becomes the responsibility of the cluster administrator.

Note

On the AWS cloud platform, if the domain on the Ingress Controller does not match with dnsConfig.Spec.BaseDomain then the DNS management policy is automatically set to Unmanaged.

9.3. Creating a custom Ingress Controller with the `Unmanaged` DNS management policy

As a cluster administrator, you can create a new custom Ingress Controller with the Unmanaged DNS management policy.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create a custom resource (CR) file named sample-ingress.yaml containing the following:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  namespace: openshift-ingress-operator
  name: <name> 
spec:
  domain: <domain> 
  endpointPublishingStrategy:
    type: LoadBalancerService
    loadBalancer:
      scope: External 
      dnsManagementPolicy: Unmanaged

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  namespace: openshift-ingress-operator
  name: <name>

1


spec:
  domain: <domain>

2


  endpointPublishingStrategy:
    type: LoadBalancerService
    loadBalancer:
      scope: External

3


      dnsManagementPolicy: Unmanaged

4

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1: Specify the <name> with a name for the IngressController object.
2: Specify the domain based on the DNS record that was created as a prerequisite.
3: Specify the scope as External to expose the load balancer externally.
4: dnsManagementPolicy indicates if the Ingress Controller is managing the lifecycle of the wildcard DNS record associated with the load balancer. The valid values are Managed and Unmanaged. The default value is Managed.

Save the file to apply the changes.
```
oc apply -f <name>.yaml 
```
```
oc apply -f <name>.yaml 
```
1
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9.4. Modifying an existing Ingress Controller

As a cluster administrator, you can modify an existing Ingress Controller to manually manage the DNS record lifecycle.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Modify the chosen IngressController to set dnsManagementPolicy:

SCOPE=$(oc -n openshift-ingress-operator get ingresscontroller <name> -o=jsonpath="{.status.endpointPublishingStrategy.loadBalancer.scope}")

oc -n openshift-ingress-operator patch ingresscontrollers/<name> --type=merge --patch='{"spec":{"endpointPublishingStrategy":{"type":"LoadBalancerService","loadBalancer":{"dnsManagementPolicy":"Unmanaged", "scope":"${SCOPE}"}}}}'

SCOPE=$(oc -n openshift-ingress-operator get ingresscontroller <name> -o=jsonpath="{.status.endpointPublishingStrategy.loadBalancer.scope}")

oc -n openshift-ingress-operator patch ingresscontrollers/<name> --type=merge --patch='{"spec":{"endpointPublishingStrategy":{"type":"LoadBalancerService","loadBalancer":{"dnsManagementPolicy":"Unmanaged", "scope":"${SCOPE}"}}}}'

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Optional: You can delete the associated DNS record in the cloud provider.

Chapter 10. Verifying connectivity to an endpoint

The Cluster Network Operator (CNO) runs a controller, the connectivity check controller, that performs a connection health check between resources within your cluster. By reviewing the results of the health checks, you can diagnose connection problems or eliminate network connectivity as the cause of an issue that you are investigating.

10.1. Connection health checks performed

To verify that cluster resources are reachable, a TCP connection is made to each of the following cluster API services:

Kubernetes API server service
Kubernetes API server endpoints
OpenShift API server service
OpenShift API server endpoints
Load balancers

To verify that services and service endpoints are reachable on every node in the cluster, a TCP connection is made to each of the following targets:

Health check target service
Health check target endpoints

10.2. Implementation of connection health checks

The connectivity check controller orchestrates connection verification checks in your cluster. The results for the connection tests are stored in PodNetworkConnectivity objects in the openshift-network-diagnostics namespace. Connection tests are performed every minute in parallel.

The Cluster Network Operator (CNO) deploys several resources to the cluster to send and receive connectivity health checks:

Health check source: This program deploys in a single pod replica set managed by a Deployment object. The program consumes PodNetworkConnectivity objects and connects to the spec.targetEndpoint specified in each object.
Health check target: A pod deployed as part of a daemon set on every node in the cluster. The pod listens for inbound health checks. The presence of this pod on every node allows for the testing of connectivity to each node.

10.3. PodNetworkConnectivityCheck object fields

The PodNetworkConnectivityCheck object fields are described in the following tables.

Table 10.1. PodNetworkConnectivityCheck object fields
Field	Type	Description
`metadata.name`	`string`	The name of the object in the following format: `<source>-to-<target>`. The destination described by `<target>` includes one of following strings: `load-balancer-api-external` `load-balancer-api-internal` `kubernetes-apiserver-endpoint` `kubernetes-apiserver-service-cluster` `network-check-target` `openshift-apiserver-endpoint` `openshift-apiserver-service-cluster`
`metadata.namespace`	`string`	The namespace that the object is associated with. This value is always `openshift-network-diagnostics`.
`spec.sourcePod`	`string`	The name of the pod where the connection check originates, such as `network-check-source-596b4c6566-rgh92`.
`spec.targetEndpoint`	`string`	The target of the connection check, such as `api.devcluster.example.com:6443`.
`spec.tlsClientCert`	`object`	Configuration for the TLS certificate to use.
`spec.tlsClientCert.name`	`string`	The name of the TLS certificate used, if any. The default value is an empty string.
`status`	`object`	An object representing the condition of the connection test and logs of recent connection successes and failures.
`status.conditions`	`array`	The latest status of the connection check and any previous statuses.
`status.failures`	`array`	Connection test logs from unsuccessful attempts.
`status.outages`	`array`	Connect test logs covering the time periods of any outages.
`status.successes`	`array`	Connection test logs from successful attempts.

The following table describes the fields for objects in the status.conditions array:

Table 10.2. status.conditions
Field	Type	Description
`lastTransitionTime`	`string`	The time that the condition of the connection transitioned from one status to another.
`message`	`string`	The details about last transition in a human readable format.
`reason`	`string`	The last status of the transition in a machine readable format.
`status`	`string`	The status of the condition.
`type`	`string`	The type of the condition.

The following table describes the fields for objects in the status.conditions array:

Table 10.3. status.outages
Field	Type	Description
`end`	`string`	The timestamp from when the connection failure is resolved.
`endLogs`	`array`	Connection log entries, including the log entry related to the successful end of the outage.
`message`	`string`	A summary of outage details in a human readable format.
`start`	`string`	The timestamp from when the connection failure is first detected.
`startLogs`	`array`	Connection log entries, including the original failure.

Connection log fields

The fields for a connection log entry are described in the following table. The object is used in the following fields:

status.failures[]
status.successes[]
status.outages[].startLogs[]
status.outages[].endLogs[]

Table 10.4. Connection log object
Field	Type	Description
`latency`	`string`	Records the duration of the action.
`message`	`string`	Provides the status in a human readable format.
`reason`	`string`	Provides the reason for status in a machine readable format. The value is one of `TCPConnect`, `TCPConnectError`, `DNSResolve`, `DNSError`.
`success`	`boolean`	Indicates if the log entry is a success or failure.
`time`	`string`	The start time of connection check.

10.4. Verifying network connectivity for an endpoint

As a cluster administrator, you can verify the connectivity of an endpoint, such as an API server, load balancer, service, or pod.

Prerequisites

Install the OpenShift CLI (oc).
Access to the cluster as a user with the cluster-admin role.

Procedure

To list the current PodNetworkConnectivityCheck objects, enter the following command:

oc get podnetworkconnectivitycheck -n openshift-network-diagnostics

$ oc get podnetworkconnectivitycheck -n openshift-network-diagnostics

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Example output

NAME                                                                                                                                AGE
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0   75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-1   73m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-2   75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-service-cluster                               75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-default-service-cluster                                 75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-load-balancer-api-external                                         75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-load-balancer-api-internal                                         75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-master-0            75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-master-1            75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-master-2            75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh      74m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-worker-c-n8mbf      74m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-worker-d-4hnrz      74m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-service-cluster                               75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-openshift-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0    75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-openshift-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-1    75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-openshift-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-2    74m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-openshift-apiserver-service-cluster                                75m

NAME                                                                                                                                AGE
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0   75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-1   73m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-2   75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-service-cluster                               75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-default-service-cluster                                 75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-load-balancer-api-external                                         75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-load-balancer-api-internal                                         75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-master-0            75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-master-1            75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-master-2            75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh      74m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-worker-c-n8mbf      74m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-ci-ln-x5sv9rb-f76d1-4rzrp-worker-d-4hnrz      74m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-network-check-target-service-cluster                               75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-openshift-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0    75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-openshift-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-1    75m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-openshift-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-2    74m
network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-openshift-apiserver-service-cluster                                75m

Copy to Clipboard

View the connection test logs:

From the output of the previous command, identify the endpoint that you want to review the connectivity logs for.

To view the object, enter the following command:

oc get podnetworkconnectivitycheck <name> \
  -n openshift-network-diagnostics -o yaml

$ oc get podnetworkconnectivitycheck <name> \
  -n openshift-network-diagnostics -o yaml

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where <name> specifies the name of the PodNetworkConnectivityCheck object.

Example output

apiVersion: controlplane.operator.openshift.io/v1alpha1
kind: PodNetworkConnectivityCheck
metadata:
  name: network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0
  namespace: openshift-network-diagnostics
  ...
spec:
  sourcePod: network-check-source-7c88f6d9f-hmg2f
  targetEndpoint: 10.0.0.4:6443
  tlsClientCert:
    name: ""
status:
  conditions:
  - lastTransitionTime: "2021-01-13T20:11:34Z"
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnectSuccess
    status: "True"
    type: Reachable
  failures:
  - latency: 2.241775ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: failed
      to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443: connect:
      connection refused'
    reason: TCPConnectError
    success: false
    time: "2021-01-13T20:10:34Z"
  - latency: 2.582129ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: failed
      to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443: connect:
      connection refused'
    reason: TCPConnectError
    success: false
    time: "2021-01-13T20:09:34Z"
  - latency: 3.483578ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: failed
      to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443: connect:
      connection refused'
    reason: TCPConnectError
    success: false
    time: "2021-01-13T20:08:34Z"
  outages:
  - end: "2021-01-13T20:11:34Z"
    endLogs:
    - latency: 2.032018ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        tcp connection to 10.0.0.4:6443 succeeded'
      reason: TCPConnect
      success: true
      time: "2021-01-13T20:11:34Z"
    - latency: 2.241775ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        failed to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443:
        connect: connection refused'
      reason: TCPConnectError
      success: false
      time: "2021-01-13T20:10:34Z"
    - latency: 2.582129ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        failed to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443:
        connect: connection refused'
      reason: TCPConnectError
      success: false
      time: "2021-01-13T20:09:34Z"
    - latency: 3.483578ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        failed to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443:
        connect: connection refused'
      reason: TCPConnectError
      success: false
      time: "2021-01-13T20:08:34Z"
    message: Connectivity restored after 2m59.999789186s
    start: "2021-01-13T20:08:34Z"
    startLogs:
    - latency: 3.483578ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        failed to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443:
        connect: connection refused'
      reason: TCPConnectError
      success: false
      time: "2021-01-13T20:08:34Z"
  successes:
  - latency: 2.845865ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:14:34Z"
  - latency: 2.926345ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:13:34Z"
  - latency: 2.895796ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:12:34Z"
  - latency: 2.696844ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:11:34Z"
  - latency: 1.502064ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:10:34Z"
  - latency: 1.388857ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:09:34Z"
  - latency: 1.906383ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:08:34Z"
  - latency: 2.089073ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:07:34Z"
  - latency: 2.156994ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:06:34Z"
  - latency: 1.777043ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:05:34Z"

apiVersion: controlplane.operator.openshift.io/v1alpha1
kind: PodNetworkConnectivityCheck
metadata:
  name: network-check-source-ci-ln-x5sv9rb-f76d1-4rzrp-worker-b-6xdmh-to-kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0
  namespace: openshift-network-diagnostics
  ...
spec:
  sourcePod: network-check-source-7c88f6d9f-hmg2f
  targetEndpoint: 10.0.0.4:6443
  tlsClientCert:
    name: ""
status:
  conditions:
  - lastTransitionTime: "2021-01-13T20:11:34Z"
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnectSuccess
    status: "True"
    type: Reachable
  failures:
  - latency: 2.241775ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: failed
      to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443: connect:
      connection refused'
    reason: TCPConnectError
    success: false
    time: "2021-01-13T20:10:34Z"
  - latency: 2.582129ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: failed
      to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443: connect:
      connection refused'
    reason: TCPConnectError
    success: false
    time: "2021-01-13T20:09:34Z"
  - latency: 3.483578ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: failed
      to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443: connect:
      connection refused'
    reason: TCPConnectError
    success: false
    time: "2021-01-13T20:08:34Z"
  outages:
  - end: "2021-01-13T20:11:34Z"
    endLogs:
    - latency: 2.032018ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        tcp connection to 10.0.0.4:6443 succeeded'
      reason: TCPConnect
      success: true
      time: "2021-01-13T20:11:34Z"
    - latency: 2.241775ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        failed to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443:
        connect: connection refused'
      reason: TCPConnectError
      success: false
      time: "2021-01-13T20:10:34Z"
    - latency: 2.582129ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        failed to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443:
        connect: connection refused'
      reason: TCPConnectError
      success: false
      time: "2021-01-13T20:09:34Z"
    - latency: 3.483578ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        failed to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443:
        connect: connection refused'
      reason: TCPConnectError
      success: false
      time: "2021-01-13T20:08:34Z"
    message: Connectivity restored after 2m59.999789186s
    start: "2021-01-13T20:08:34Z"
    startLogs:
    - latency: 3.483578ms
      message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0:
        failed to establish a TCP connection to 10.0.0.4:6443: dial tcp 10.0.0.4:6443:
        connect: connection refused'
      reason: TCPConnectError
      success: false
      time: "2021-01-13T20:08:34Z"
  successes:
  - latency: 2.845865ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:14:34Z"
  - latency: 2.926345ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:13:34Z"
  - latency: 2.895796ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:12:34Z"
  - latency: 2.696844ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:11:34Z"
  - latency: 1.502064ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:10:34Z"
  - latency: 1.388857ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:09:34Z"
  - latency: 1.906383ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:08:34Z"
  - latency: 2.089073ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:07:34Z"
  - latency: 2.156994ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:06:34Z"
  - latency: 1.777043ms
    message: 'kubernetes-apiserver-endpoint-ci-ln-x5sv9rb-f76d1-4rzrp-master-0: tcp
      connection to 10.0.0.4:6443 succeeded'
    reason: TCPConnect
    success: true
    time: "2021-01-13T21:05:34Z"

Copy to Clipboard

Chapter 11. Changing the MTU for the cluster network

As a cluster administrator, you can change the MTU for the cluster network after cluster installation. This change is disruptive as cluster nodes must be rebooted to finalize the MTU change. You can change the MTU only for clusters using the OVN-Kubernetes or OpenShift SDN network plugins.

11.1. About the cluster MTU

During installation the maximum transmission unit (MTU) for the cluster network is detected automatically based on the MTU of the primary network interface of nodes in the cluster. You do not normally need to override the detected MTU.

You might want to change the MTU of the cluster network for several reasons:

The MTU detected during cluster installation is not correct for your infrastructure
Your cluster infrastructure now requires a different MTU, such as from the addition of nodes that need a different MTU for optimal performance

You can change the cluster MTU for only the OVN-Kubernetes and OpenShift SDN cluster network plugins.

11.1.1. Service interruption considerations

When you initiate an MTU change on your cluster the following effects might impact service availability:

At least two rolling reboots are required to complete the migration to a new MTU. During this time, some nodes are not available as they restart.
Specific applications deployed to the cluster with shorter timeout intervals than the absolute TCP timeout interval might experience disruption during the MTU change.

11.1.2. MTU value selection

When planning your MTU migration there are two related but distinct MTU values to consider.

Hardware MTU: This MTU value is set based on the specifics of your network infrastructure.
Cluster network MTU: This MTU value is always less than your hardware MTU to account for the cluster network overlay overhead. The specific overhead is determined by your network plugin:
- OVN-Kubernetes: 100 bytes
- OpenShift SDN: 50 bytes

If your cluster requires different MTU values for different nodes, you must subtract the overhead value for your network plugin from the lowest MTU value that is used by any node in your cluster. For example, if some nodes in your cluster have an MTU of 9001, and some have an MTU of 1500, you must set this value to 1400.

Important

To avoid selecting an MTU value that is not acceptable by a node, verify the maximum MTU value (maxmtu) that is accepted by the network interface by using the ip -d link command.

11.1.3. How the migration process works

The following table summarizes the migration process by segmenting between the user-initiated steps in the process and the actions that the migration performs in response.

Table 11.1. Live migration of the cluster MTU
User-initiated steps	OpenShift Container Platform activity
Set the following values in the Cluster Network Operator configuration: `spec.migration.mtu.machine.to` `spec.migration.mtu.network.from` `spec.migration.mtu.network.to`	Cluster Network Operator (CNO): Confirms that each field is set to a valid value. The `mtu.machine.to` must be set to either the new hardware MTU or to the current hardware MTU if the MTU for the hardware is not changing. This value is transient and is used as part of the migration process. Separately, if you specify a hardware MTU that is different from your existing hardware MTU value, you must manually configure the MTU to persist by other means, such as with a machine config, DHCP setting, or a Linux kernel command line. The `mtu.network.from` field must equal the `network.status.clusterNetworkMTU` field, which is the current MTU of the cluster network. The `mtu.network.to` field must be set to the target cluster network MTU and must be lower than the hardware MTU to allow for the overlay overhead of the network plugin. For OVN-Kubernetes, the overhead is `100` bytes and for OpenShift SDN the overhead is `50` bytes. If the values provided are valid, the CNO writes out a new temporary configuration with the MTU for the cluster network set to the value of the `mtu.network.to` field. Machine Config Operator (MCO): Performs a rolling reboot of each node in the cluster.
Reconfigure the MTU of the primary network interface for the nodes on the cluster. You can use a variety of methods to accomplish this, including: Deploying a new NetworkManager connection profile with the MTU change Changing the MTU through a DHCP server setting Changing the MTU through boot parameters	N/A
Set the `mtu` value in the CNO configuration for the network plugin and set `spec.migration` to `null`.	Machine Config Operator (MCO): Performs a rolling reboot of each node in the cluster with the new MTU configuration.

11.2. Changing the cluster MTU

As a cluster administrator, you can change the maximum transmission unit (MTU) for your cluster. The migration is disruptive and nodes in your cluster might be temporarily unavailable as the MTU update rolls out.

The following procedure describes how to change the cluster MTU by using either machine configs, DHCP, or an ISO. If you use the DHCP or ISO approach, you must refer to configuration artifacts that you kept after installing your cluster to complete the procedure.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You identified the target MTU for your cluster. The correct MTU varies depending on the network plugin that your cluster uses:
- OVN-Kubernetes: The cluster MTU must be set to 100 less than the lowest hardware MTU value in your cluster.
- OpenShift SDN: The cluster MTU must be set to 50 less than the lowest hardware MTU value in your cluster.
If your nodes are physical machines, ensure that the cluster network and the connected network switches support jumbo frames.
If your nodes are virtual machines (VMs), ensure that the hypervisor and the connected network switches support jumbo frames.

Procedure

To increase or decrease the MTU for the cluster network complete the following procedure.

To obtain the current MTU for the cluster network, enter the following command:

oc describe network.config cluster

$ oc describe network.config cluster

Copy to Clipboard

Example output

...
Status:
  Cluster Network:
    Cidr:               10.217.0.0/22
    Host Prefix:        23
  Cluster Network MTU:  1400
  Network Type:         OpenShiftSDN
  Service Network:
    10.217.4.0/23
...

...
Status:
  Cluster Network:
    Cidr:               10.217.0.0/22
    Host Prefix:        23
  Cluster Network MTU:  1400
  Network Type:         OpenShiftSDN
  Service Network:
    10.217.4.0/23
...

Copy to Clipboard

Prepare your configuration for the hardware MTU:
- If your hardware MTU is specified with DHCP, update your DHCP configuration such as with the following dnsmasq configuration:
  dhcp-option-force=26,<mtu>
  Copy to Clipboard
  where:
  <mtu>
  Specifies the hardware MTU for the DHCP server to advertise.
- If your hardware MTU is specified with a kernel command line with PXE, update that configuration accordingly.
- If your hardware MTU is specified in a NetworkManager connection configuration, complete the following steps. This approach is the default for OpenShift Container Platform if you do not explicitly specify your network configuration with DHCP, a kernel command line, or some other method. Your cluster nodes must all use the same underlying network configuration for the following procedure to work unmodified.
  1. Find the primary network interface:
    If you are using the OpenShift SDN network plugin, enter the following command:
    
    $ oc debug node/<node_name> -- chroot /host ip route list match 0.0.0.0/0 | awk '{print $5 }'
    
    Copy to Clipboard
    
    where:
    <node_name>
    Specifies the name of a node in your cluster.
    If you are using the OVN-Kubernetes network plugin, enter the following command:
    
    $ oc debug node/<node_name> -- chroot /host nmcli -g connection.interface-name c show ovs-if-phys0
    
    Copy to Clipboard
    
    where:
    <node_name>
    Specifies the name of a node in your cluster.
  2. Create the following NetworkManager configuration in the <interface>-mtu.conf file:
    Example NetworkManager connection configuration
    
    [connection-<interface>-mtu] match-device=interface-name:<interface> ethernet.mtu=<mtu>
    
    Copy to Clipboard
    
    where:
    <mtu>
    Specifies the new hardware MTU value.
    <interface>
    Specifies the primary network interface name.
  3. Create two MachineConfig objects, one for the control plane nodes and another for the worker nodes in your cluster:
    Create the following Butane config in the control-plane-interface.bu file:
    Note
    The Butane version you specify in the config file should match the OpenShift Container Platform version and always ends in 0. For example, 4.13.0. See "Creating machine configs with Butane" for information about Butane.
    
    variant: openshift version: 4.13.0 metadata: name: 01-control-plane-interface labels: machineconfiguration.openshift.io/role: master storage: files: - path: /etc/NetworkManager/conf.d/99-<interface>-mtu.conf
    1
    contents: local: <interface>-mtu.conf
    2
    mode: 0600
    
    Copy to Clipboard
    
    1 1
    Specify the NetworkManager connection name for the primary network interface.
    2
    Specify the local filename for the updated NetworkManager configuration file from the previous step.
    Create the following Butane config in the worker-interface.bu file:
    Note
    The Butane version you specify in the config file should match the OpenShift Container Platform version and always ends in 0. For example, 4.13.0. See "Creating machine configs with Butane" for information about Butane.
    
    variant: openshift version: 4.13.0 metadata: name: 01-worker-interface labels: machineconfiguration.openshift.io/role: worker storage: files: - path: /etc/NetworkManager/conf.d/99-<interface>-mtu.conf
    1
    contents: local: <interface>-mtu.conf
    2
    mode: 0600
    
    Copy to Clipboard
    
    1
    Specify the NetworkManager connection name for the primary network interface.
    2
    Specify the local filename for the updated NetworkManager configuration file from the previous step.
    Create MachineConfig objects from the Butane configs by running the following command:
    
    $ for manifest in control-plane-interface worker-interface; do butane --files-dir . $manifest.bu > $manifest.yaml done
    
    Copy to Clipboard

To begin the MTU migration, specify the migration configuration by entering the following command. The Machine Config Operator performs a rolling reboot of the nodes in the cluster in preparation for the MTU change.

oc patch Network.operator.openshift.io cluster --type=merge --patch \
  '{"spec": { "migration": { "mtu": { "network": { "from": <overlay_from>, "to": <overlay_to> } , "machine": { "to" : <machine_to> } } } } }'

$ oc patch Network.operator.openshift.io cluster --type=merge --patch \
  '{"spec": { "migration": { "mtu": { "network": { "from": <overlay_from>, "to": <overlay_to> } , "machine": { "to" : <machine_to> } } } } }'

Copy to Clipboard

where:

<overlay_from>: Specifies the current cluster network MTU value.
<overlay_to>: Specifies the target MTU for the cluster network. This value is set relative to the value for <machine_to> and for OVN-Kubernetes must be 100 less and for OpenShift SDN must be 50 less.
<machine_to>: Specifies the MTU for the primary network interface on the underlying host network.

Example that increases the cluster MTU

oc patch Network.operator.openshift.io cluster --type=merge --patch \
  '{"spec": { "migration": { "mtu": { "network": { "from": 1400, "to": 9000 } , "machine": { "to" : 9100} } } } }'

$ oc patch Network.operator.openshift.io cluster --type=merge --patch \
  '{"spec": { "migration": { "mtu": { "network": { "from": 1400, "to": 9000 } , "machine": { "to" : 9100} } } } }'

Copy to Clipboard

As the MCO updates machines in each machine config pool, it reboots each node one by one. You must wait until all the nodes are updated. Check the machine config pool status by entering the following command:
```
oc get mcp
```
```
$ oc get mcp
```
Copy to Clipboard
A successfully updated node has the following status: UPDATED=true, UPDATING=false, DEGRADED=false.
Note
By default, the MCO updates one machine per pool at a time, causing the total time the migration takes to increase with the size of the cluster.

Confirm the status of the new machine configuration on the hosts:

To list the machine configuration state and the name of the applied machine configuration, enter the following command:

oc describe node | egrep "hostname|machineconfig"

$ oc describe node | egrep "hostname|machineconfig"

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Example output

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

Copy to Clipboard

Verify that the following statements are true:

The value of machineconfiguration.openshift.io/state field is Done.
The value of the machineconfiguration.openshift.io/currentConfig field is equal to the value of the machineconfiguration.openshift.io/desiredConfig field.

To confirm that the machine config is correct, enter the following command:
```
oc get machineconfig <config_name> -o yaml | grep ExecStart
```
```
$ oc get machineconfig <config_name> -o yaml | grep ExecStart
```
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where <config_name> is the name of the machine config from the machineconfiguration.openshift.io/currentConfig field.
The machine config must include the following update to the systemd configuration:
```
ExecStart=/usr/local/bin/mtu-migration.sh
```
```
ExecStart=/usr/local/bin/mtu-migration.sh
```
Copy to Clipboard

Update the underlying network interface MTU value:
- If you are specifying the new MTU with a NetworkManager connection configuration, enter the following command. The MachineConfig Operator automatically performs a rolling reboot of the nodes in your cluster.
  $ for manifest in control-plane-interface worker-interface; do oc create -f $manifest.yaml done
  Copy to Clipboard
- If you are specifying the new MTU with a DHCP server option or a kernel command line and PXE, make the necessary changes for your infrastructure.
As the MCO updates machines in each machine config pool, it reboots each node one by one. You must wait until all the nodes are updated. Check the machine config pool status by entering the following command:
```
oc get mcp
```
```
$ oc get mcp
```
Copy to Clipboard
A successfully updated node has the following status: UPDATED=true, UPDATING=false, DEGRADED=false.
Note
By default, the MCO updates one machine per pool at a time, causing the total time the migration takes to increase with the size of the cluster.
Confirm the status of the new machine configuration on the hosts:
1. To list the machine configuration state and the name of the applied machine configuration, enter the following command:
  $ oc describe node | egrep "hostname|machineconfig"
  Copy to Clipboard
  Example output
  kubernetes.io/hostname=master-0 machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b machineconfiguration.openshift.io/reason: machineconfiguration.openshift.io/state: Done
  
  Copy to Clipboard
  Verify that the following statements are true:
  - The value of machineconfiguration.openshift.io/state field is Done.
  - The value of the machineconfiguration.openshift.io/currentConfig field is equal to the value of the machineconfiguration.openshift.io/desiredConfig field.
2. To confirm that the machine config is correct, enter the following command:
  $ oc get machineconfig <config_name> -o yaml | grep path:
  Copy to Clipboard
  where <config_name> is the name of the machine config from the machineconfiguration.openshift.io/currentConfig field.
  If the machine config is successfully deployed, the previous output contains the /etc/NetworkManager/conf.d/99-<interface>-mtu.conf file path and the ExecStart=/usr/local/bin/mtu-migration.sh line.

To finalize the MTU migration, enter one of the following commands:

If you are using the OVN-Kubernetes network plugin:

oc patch Network.operator.openshift.io cluster --type=merge --patch \
  '{"spec": { "migration": null, "defaultNetwork":{ "ovnKubernetesConfig": { "mtu": <mtu> }}}}'

$ oc patch Network.operator.openshift.io cluster --type=merge --patch \
  '{"spec": { "migration": null, "defaultNetwork":{ "ovnKubernetesConfig": { "mtu": <mtu> }}}}'

Copy to Clipboard

where:

<mtu>: Specifies the new cluster network MTU that you specified with <overlay_to>.

If you are using the OpenShift SDN network plugin:

oc patch Network.operator.openshift.io cluster --type=merge --patch \
  '{"spec": { "migration": null, "defaultNetwork":{ "openshiftSDNConfig": { "mtu": <mtu> }}}}'

$ oc patch Network.operator.openshift.io cluster --type=merge --patch \
  '{"spec": { "migration": null, "defaultNetwork":{ "openshiftSDNConfig": { "mtu": <mtu> }}}}'

Copy to Clipboard

where:

<mtu>: Specifies the new cluster network MTU that you specified with <overlay_to>.

After finalizing the MTU migration, each MCP node is rebooted one by one. You must wait until all the nodes are updated. Check the machine config pool status by entering the following command:
```
oc get mcp
```
```
$ oc get mcp
```
Copy to Clipboard
A successfully updated node has the following status: UPDATED=true, UPDATING=false, DEGRADED=false.

Verification

You can verify that a node in your cluster uses an MTU that you specified in the previous procedure.

To get the current MTU for the cluster network, enter the following command:
```
oc describe network.config cluster
```
```
$ oc describe network.config cluster
```
Copy to Clipboard
Get the current MTU for the primary network interface of a node.
1. To list the nodes in your cluster, enter the following command:
  $ oc get nodes
  Copy to Clipboard
2. To obtain the current MTU setting for the primary network interface on a node, enter the following command:
  $ oc debug node/<node> -- chroot /host ip address show <interface>
  Copy to Clipboard
  where:
  <node>
  Specifies a node from the output from the previous step.
  <interface>
  Specifies the primary network interface name for the node.
  Example output
  ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8051
  
  Copy to Clipboard

Chapter 12. Configuring the node port service range

During cluster installation, you can configure the node port range to meet the requirements of your cluster. After cluster installation, only a cluster administrator can expand the range as a postinstallation task. If your cluster uses a large number of node ports, consider increasing the available port range according to the requirements of your cluster.

Important

Before you expand a node port range, consider that Red Hat has not performed testing outside the default port range of 30000-32768. For ranges outside the default port range, ensure that you test to verify the expanding node port range does not impact your cluster. If you expanded the range and a port allocation issue occurs, create a new cluster and set the required range for it.

If you do not set a node port range during cluster installation, the default range of 30000-32768 applies to your cluster. In this situation, you can expand the range on either side, but you must preserve 30000-32768 within your new port range.

Important

If you expand the node port range and OpenShift CLI (oc) stops working because of a port conflict with the OpenShift API server, you must create a new cluster. Ensure that the new node port range does not overlap with any ports already in use by host processes or pods that are configured with host networking.

12.1. Expanding the node port range

You can expand the node port range for your cluster. However, after you install your OpenShift Container Platform cluster, you cannot contract the node port range on either side.

Important

Before you expand a node port range, consider that Red Hat has not performed testing outside the default port range of 30000-32768. For ranges outside the default port range, ensure that you test to verify the expanding node port range does not impact your cluster. If you expanded the range and a port allocation issue occurs, create a new cluster and set the required range for it.

Prerequisites

Installed the OpenShift CLI (oc).
Logged in to the cluster as a user with cluster-admin privileges.
You ensured that your cluster infrastructure allows access to the ports that exist in the extended range. For example, if you expand the node port range to 30000-32900, your firewall or packet filtering configuration must allow the inclusive port range of 30000-32900.

Procedure

Expand the range for the serviceNodePortRange parameter in the network.config.openshift.io object that your cluster uses to manage traffic for pods by entering the following command in your command-line interface (CLI):

oc patch network.config.openshift.io cluster --type=merge -p \
  '{

$ oc patch network.config.openshift.io cluster --type=merge -p \
  '{
    "spec":
      { "serviceNodePortRange": "<port_range>" }

1

}'

Copy to Clipboard

1: Where <port_range> is your expanded range, such as 30000-32900.

Tip

You can also apply the following YAML to update the node port range:

apiVersion: config.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  serviceNodePortRange: "<port_range>"
# ...

apiVersion: config.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  serviceNodePortRange: "<port_range>"
# ...

Copy to Clipboard

Example output

network.config.openshift.io/cluster patched

network.config.openshift.io/cluster patched

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Verification

To confirm a successful configuration, enter the following command. The update can take several minutes to apply.

oc get configmaps -n openshift-kube-apiserver config \
  -o jsonpath="{.data['config\.yaml']}" | \
  grep -Eo '"service-node-port-range":["[[:digit:]]+-[[:digit:]]+"]'

$ oc get configmaps -n openshift-kube-apiserver config \
  -o jsonpath="{.data['config\.yaml']}" | \
  grep -Eo '"service-node-port-range":["[[:digit:]]+-[[:digit:]]+"]'

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Example output

"service-node-port-range":["30000-32900"]

"service-node-port-range":["30000-32900"]

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Chapter 13. Configuring the cluster network range

As a cluster administrator, you can expand the cluster network range after cluster installation. You might want to expand the cluster network range if you need more IP addresses for additional nodes.

For example, if you deployed a cluster and specified 10.128.0.0/19 as the cluster network range and a host prefix of 23, you are limited to 16 nodes. You can expand that to 510 nodes by changing the CIDR mask on a cluster to /14.

When expanding the cluster network address range, your cluster must use the OVN-Kubernetes network plugin. Other network plugins are not supported.

The following limitations apply when modifying the cluster network IP address range:

The CIDR mask size specified must always be smaller than the currently configured CIDR mask size, because you can only increase IP space by adding more nodes to an installed cluster
The host prefix cannot be modified
Pods that are configured with an overridden default gateway must be recreated after the cluster network expands

13.1. Expanding the cluster network IP address range

You can expand the IP address range for the cluster network. Because this change requires rolling out a new Operator configuration across the cluster, it can take up to 30 minutes to take effect.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster with a user with cluster-admin privileges.
Ensure that the cluster uses the OVN-Kubernetes network plugin.

Procedure

To obtain the cluster network range and host prefix for your cluster, enter the following command:

oc get network.operator.openshift.io \
  -o jsonpath="{.items[0].spec.clusterNetwork}"

$ oc get network.operator.openshift.io \
  -o jsonpath="{.items[0].spec.clusterNetwork}"

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Example output

[{"cidr":"10.217.0.0/22","hostPrefix":23}]

[{"cidr":"10.217.0.0/22","hostPrefix":23}]

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To expand the cluster network IP address range, enter the following command. Use the CIDR IP address range and host prefix returned from the output of the previous command.
```
oc patch Network.config.openshift.io cluster --type='merge' --patch \
  '{
```
```
$ oc patch Network.config.openshift.io cluster --type='merge' --patch \
  '{
    "spec":{
      "clusterNetwork": [ {"cidr":"<network>/<cidr>","hostPrefix":<prefix>} ],
      "networkType": "OVNKubernetes"
    }
  }'
```
Copy to Clipboard
where:
<network>
Specifies the network part of the cidr field that you obtained from the previous step. You cannot change this value.
<cidr>
Specifies the network prefix length. For example, 14. Change this value to a smaller number than the value from the output in the previous step to expand the cluster network range.
<prefix>
Specifies the current host prefix for your cluster. This value must be the same value for the hostPrefix field that you obtained from the previous step.
Example command
```
oc patch Network.config.openshift.io cluster --type='merge' --patch \
  '{
```
```
$ oc patch Network.config.openshift.io cluster --type='merge' --patch \
  '{
    "spec":{
      "clusterNetwork": [ {"cidr":"10.217.0.0/14","hostPrefix": 23} ],
      "networkType": "OVNKubernetes"
    }
  }'
```
Copy to Clipboard
Example output
```
network.config.openshift.io/cluster patched
```
```
network.config.openshift.io/cluster patched
```
Copy to Clipboard

To confirm that the configuration is active, enter the following command. It can take up to 30 minutes for this change to take effect.

oc get network.operator.openshift.io \
  -o jsonpath="{.items[0].spec.clusterNetwork}"

$ oc get network.operator.openshift.io \
  -o jsonpath="{.items[0].spec.clusterNetwork}"

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Example output

[{"cidr":"10.217.0.0/14","hostPrefix":23}]

[{"cidr":"10.217.0.0/14","hostPrefix":23}]

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Chapter 14. Configuring IP failover

This topic describes configuring IP failover for pods and services on your OpenShift Container Platform cluster.

IP failover uses Keepalived to host a set of externally accessible Virtual IP (VIP) addresses on a set of hosts. Each VIP address is only serviced by a single host at a time. Keepalived uses the Virtual Router Redundancy Protocol (VRRP) to determine which host, from the set of hosts, services which VIP. If a host becomes unavailable, or if the service that Keepalived is watching does not respond, the VIP is switched to another host from the set. This means a VIP is always serviced as long as a host is available.

Every VIP in the set is serviced by a node selected from the set. If a single node is available, the VIPs are served. There is no way to explicitly distribute the VIPs over the nodes, so there can be nodes with no VIPs and other nodes with many VIPs. If there is only one node, all VIPs are on it.

The administrator must ensure that all of the VIP addresses meet the following requirements:

Accessible on the configured hosts from outside the cluster.
Not used for any other purpose within the cluster.

Keepalived on each node determines whether the needed service is running. If it is, VIPs are supported and Keepalived participates in the negotiation to determine which node serves the VIP. For a node to participate, the service must be listening on the watch port on a VIP or the check must be disabled.

Note

Each VIP in the set might be served by a different node.

IP failover monitors a port on each VIP to determine whether the port is reachable on the node. If the port is not reachable, the VIP is not assigned to the node. If the port is set to 0, this check is suppressed. The check script does the needed testing.

When a node running Keepalived passes the check script, the VIP on that node can enter the master state based on its priority and the priority of the current master and as determined by the preemption strategy.

A cluster administrator can provide a script through the OPENSHIFT_HA_NOTIFY_SCRIPT variable, and this script is called whenever the state of the VIP on the node changes. Keepalived uses the master state when it is servicing the VIP, the backup state when another node is servicing the VIP, or in the fault state when the check script fails. The notify script is called with the new state whenever the state changes.

You can create an IP failover deployment configuration on OpenShift Container Platform. The IP failover deployment configuration specifies the set of VIP addresses, and the set of nodes on which to service them. A cluster can have multiple IP failover deployment configurations, with each managing its own set of unique VIP addresses. Each node in the IP failover configuration runs an IP failover pod, and this pod runs Keepalived.

When using VIPs to access a pod with host networking, the application pod runs on all nodes that are running the IP failover pods. This enables any of the IP failover nodes to become the master and service the VIPs when needed. If application pods are not running on all nodes with IP failover, either some IP failover nodes never service the VIPs or some application pods never receive any traffic. Use the same selector and replication count, for both IP failover and the application pods, to avoid this mismatch.

While using VIPs to access a service, any of the nodes can be in the IP failover set of nodes, since the service is reachable on all nodes, no matter where the application pod is running. Any of the IP failover nodes can become master at any time. The service can either use external IPs and a service port or it can use a NodePort. Setting up a NodePort is a privileged operation.

When using external IPs in the service definition, the VIPs are set to the external IPs, and the IP failover monitoring port is set to the service port. When using a node port, the port is open on every node in the cluster, and the service load-balances traffic from whatever node currently services the VIP. In this case, the IP failover monitoring port is set to the NodePort in the service definition.

Important

Even though a service VIP is highly available, performance can still be affected. Keepalived makes sure that each of the VIPs is serviced by some node in the configuration, and several VIPs can end up on the same node even when other nodes have none. Strategies that externally load-balance across a set of VIPs can be thwarted when IP failover puts multiple VIPs on the same node.

When you use ExternalIP, you can set up IP failover to have the same VIP range as the ExternalIP range. You can also disable the monitoring port. In this case, all of the VIPs appear on same node in the cluster. Any user can set up a service with an ExternalIP and make it highly available.

Important

There are a maximum of 254 VIPs in the cluster.

14.1. IP failover environment variables

The following table contains the variables used to configure IP failover.

Table 14.1. IP failover environment variables
Variable Name	Default	Description
`OPENSHIFT_HA_MONITOR_PORT`	`80`	The IP failover pod tries to open a TCP connection to this port on each Virtual IP (VIP). If connection is established, the service is considered to be running. If this port is set to `0`, the test always passes.
`OPENSHIFT_HA_NETWORK_INTERFACE`		The interface name that IP failover uses to send Virtual Router Redundancy Protocol (VRRP) traffic. The default value is `eth0`. If your cluster uses the OVN-Kubernetes network plugin, set this value to `br-ex` to avoid packet loss. For a cluster that uses the OVN-Kubernetes network plugin, all listening interfaces do not serve VRRP but instead expect inbound traffic over a `br-ex` bridge.
`OPENSHIFT_HA_REPLICA_COUNT`	`2`	The number of replicas to create. This must match `spec.replicas` value in IP failover deployment configuration.
`OPENSHIFT_HA_VIRTUAL_IPS`		The list of IP address ranges to replicate. This must be provided. For example, `1.2.3.4-6,1.2.3.9`.
`OPENSHIFT_HA_VRRP_ID_OFFSET`	`0`	The offset value used to set the virtual router IDs. Using different offset values allows multiple IP failover configurations to exist within the same cluster. The default offset is `0`, and the allowed range is `0` through `255`.
`OPENSHIFT_HA_VIP_GROUPS`		The number of groups to create for VRRP. If not set, a group is created for each virtual IP range specified with the `OPENSHIFT_HA_VIP_GROUPS` variable.
`OPENSHIFT_HA_IPTABLES_CHAIN`	INPUT	The name of the iptables chain, to automatically add an `iptables` rule to allow the VRRP traffic on. If the value is not set, an `iptables` rule is not added. If the chain does not exist, it is not created.
`OPENSHIFT_HA_CHECK_SCRIPT`		The full path name in the pod file system of a script that is periodically run to verify the application is operating.
`OPENSHIFT_HA_CHECK_INTERVAL`	`2`	The period, in seconds, that the check script is run.
`OPENSHIFT_HA_NOTIFY_SCRIPT`		The full path name in the pod file system of a script that is run whenever the state changes.
`OPENSHIFT_HA_PREEMPTION`	`preempt_nodelay 300`	The strategy for handling a new higher priority host. The `nopreempt` strategy does not move master from the lower priority host to the higher priority host.

14.2. Configuring IP failover in your cluster

As a cluster administrator, you can configure IP failover on an entire cluster, or on a subset of nodes, as defined by the label selector. You can also configure multiple IP failover deployments in your cluster, where each one is independent of the others.

The IP failover deployment ensures that a failover pod runs on each of the nodes matching the constraints or the label used.

This pod runs Keepalived, which can monitor an endpoint and use Virtual Router Redundancy Protocol (VRRP) to fail over the virtual IP (VIP) from one node to another if the first node cannot reach the service or endpoint.

For production use, set a selector that selects at least two nodes, and set replicas equal to the number of selected nodes.

Prerequisites

You are logged in to the cluster as a user with cluster-admin privileges.
You created a pull secret.
Red Hat OpenStack Platform (RHOSP) only:
- You installed an RHOSP client (RHCOS documentation) on the target environment.
- You also downloaded the RHOSP openrc.sh rc file (RHCOS documentation).

Procedure

Create an IP failover service account:
```
oc create sa ipfailover
```
```
$ oc create sa ipfailover
```
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Update security context constraints (SCC) for hostNetwork:

oc adm policy add-scc-to-user privileged -z ipfailover

$ oc adm policy add-scc-to-user privileged -z ipfailover

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oc adm policy add-scc-to-user hostnetwork -z ipfailover

$ oc adm policy add-scc-to-user hostnetwork -z ipfailover

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Red Hat OpenStack Platform (RHOSP) only: Complete the following steps to make a failover VIP address reachable on RHOSP ports.

Use the RHOSP CLI to show the default RHOSP API and VIP addresses in the allowed_address_pairs parameter of your RHOSP cluster:

openstack port show <cluster_name> -c allowed_address_pairs

$ openstack port show <cluster_name> -c allowed_address_pairs

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Output example

*Field*                  *Value*
allowed_address_pairs    ip_address='192.168.0.5', mac_address='fa:16:3e:31:f9:cb'
                         ip_address='192.168.0.7', mac_address='fa:16:3e:31:f9:cb'

*Field*                  *Value*
allowed_address_pairs    ip_address='192.168.0.5', mac_address='fa:16:3e:31:f9:cb'
                         ip_address='192.168.0.7', mac_address='fa:16:3e:31:f9:cb'

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Set a different VIP address for the IP failover deployment and make the address reachable on RHOSP ports by entering the following command in the RHOSP CLI. Do not set any default RHOSP API and VIP addresses as the failover VIP address for the IP failover deployment.
Example of adding the 1.1.1.1 failover IP address as an allowed address on RHOSP ports.
```
openstack port set <cluster_name> --allowed-address ip-address=1.1.1.1,mac-address=fa:fa:16:3e:31:f9:cb
```
```
$ openstack port set <cluster_name> --allowed-address ip-address=1.1.1.1,mac-address=fa:fa:16:3e:31:f9:cb
```
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Create a deployment YAML file to configure IP failover for your deployment. See "Example deployment YAML for IP failover configuration" in a later step.

Specify the following specification in the IP failover deployment so that you pass the failover VIP address to the OPENSHIFT_HA_VIRTUAL_IPS environment variable:

Example of adding the 1.1.1.1 VIP address to OPENSHIFT_HA_VIRTUAL_IPS

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ipfailover-keepalived
# ...
      spec:
          env:
          - name: OPENSHIFT_HA_VIRTUAL_IPS
          value: "1.1.1.1"
# ...

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ipfailover-keepalived
# ...
      spec:
          env:
          - name: OPENSHIFT_HA_VIRTUAL_IPS
          value: "1.1.1.1"
# ...

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Create a deployment YAML file to configure IP failover.

Note

For Red Hat OpenStack Platform (RHOSP), you do not need to re-create the deployment YAML file. You already created this file as part of the earlier instructions.

Example deployment YAML for IP failover configuration

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ipfailover-keepalived 
  labels:
    ipfailover: hello-openshift
spec:
  strategy:
    type: Recreate
  replicas: 2
  selector:
    matchLabels:
      ipfailover: hello-openshift
  template:
    metadata:
      labels:
        ipfailover: hello-openshift
    spec:
      serviceAccountName: ipfailover
      privileged: true
      hostNetwork: true
      nodeSelector:
        node-role.kubernetes.io/worker: ""
      containers:
      - name: openshift-ipfailover
        image: registry.redhat.io/openshift4/ose-keepalived-ipfailover:v4.13
        ports:
        - containerPort: 63000
          hostPort: 63000
        imagePullPolicy: IfNotPresent
        securityContext:
          privileged: true
        volumeMounts:
        - name: lib-modules
          mountPath: /lib/modules
          readOnly: true
        - name: host-slash
          mountPath: /host
          readOnly: true
          mountPropagation: HostToContainer
        - name: etc-sysconfig
          mountPath: /etc/sysconfig
          readOnly: true
        - name: config-volume
          mountPath: /etc/keepalive
        env:
        - name: OPENSHIFT_HA_CONFIG_NAME
          value: "ipfailover"
        - name: OPENSHIFT_HA_VIRTUAL_IPS 
          value: "1.1.1.1-2"
        - name: OPENSHIFT_HA_VIP_GROUPS 
          value: "10"
        - name: OPENSHIFT_HA_NETWORK_INTERFACE 
          value: "ens3" #The host interface to assign the VIPs
        - name: OPENSHIFT_HA_MONITOR_PORT 
          value: "30060"
        - name: OPENSHIFT_HA_VRRP_ID_OFFSET 
          value: "0"
        - name: OPENSHIFT_HA_REPLICA_COUNT 
          value: "2" #Must match the number of replicas in the deployment
        - name: OPENSHIFT_HA_USE_UNICAST
          value: "false"
        #- name: OPENSHIFT_HA_UNICAST_PEERS
          #value: "10.0.148.40,10.0.160.234,10.0.199.110"
        - name: OPENSHIFT_HA_IPTABLES_CHAIN 
          value: "INPUT"
        #- name: OPENSHIFT_HA_NOTIFY_SCRIPT 
        #  value: /etc/keepalive/mynotifyscript.sh
        - name: OPENSHIFT_HA_CHECK_SCRIPT 
          value: "/etc/keepalive/mycheckscript.sh"
        - name: OPENSHIFT_HA_PREEMPTION 
          value: "preempt_delay 300"
        - name: OPENSHIFT_HA_CHECK_INTERVAL 
          value: "2"
        livenessProbe:
          initialDelaySeconds: 10
          exec:
            command:
            - pgrep
            - keepalived
      volumes:
      - name: lib-modules
        hostPath:
          path: /lib/modules
      - name: host-slash
        hostPath:
          path: /
      - name: etc-sysconfig
        hostPath:
          path: /etc/sysconfig
      # config-volume contains the check script
      # created with `oc create configmap keepalived-checkscript --from-file=mycheckscript.sh`
      - configMap:
          defaultMode: 0755
          name: keepalived-checkscript
        name: config-volume
      imagePullSecrets:
        - name: openshift-pull-secret

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ipfailover-keepalived

1


  labels:
    ipfailover: hello-openshift
spec:
  strategy:
    type: Recreate
  replicas: 2
  selector:
    matchLabels:
      ipfailover: hello-openshift
  template:
    metadata:
      labels:
        ipfailover: hello-openshift
    spec:
      serviceAccountName: ipfailover
      privileged: true
      hostNetwork: true
      nodeSelector:
        node-role.kubernetes.io/worker: ""
      containers:
      - name: openshift-ipfailover
        image: registry.redhat.io/openshift4/ose-keepalived-ipfailover:v4.13
        ports:
        - containerPort: 63000
          hostPort: 63000
        imagePullPolicy: IfNotPresent
        securityContext:
          privileged: true
        volumeMounts:
        - name: lib-modules
          mountPath: /lib/modules
          readOnly: true
        - name: host-slash
          mountPath: /host
          readOnly: true
          mountPropagation: HostToContainer
        - name: etc-sysconfig
          mountPath: /etc/sysconfig
          readOnly: true
        - name: config-volume
          mountPath: /etc/keepalive
        env:
        - name: OPENSHIFT_HA_CONFIG_NAME
          value: "ipfailover"
        - name: OPENSHIFT_HA_VIRTUAL_IPS

2


          value: "1.1.1.1-2"
        - name: OPENSHIFT_HA_VIP_GROUPS

3


          value: "10"
        - name: OPENSHIFT_HA_NETWORK_INTERFACE

4


          value: "ens3" #The host interface to assign the VIPs
        - name: OPENSHIFT_HA_MONITOR_PORT

5


          value: "30060"
        - name: OPENSHIFT_HA_VRRP_ID_OFFSET

6


          value: "0"
        - name: OPENSHIFT_HA_REPLICA_COUNT

7


          value: "2" #Must match the number of replicas in the deployment
        - name: OPENSHIFT_HA_USE_UNICAST
          value: "false"
        #- name: OPENSHIFT_HA_UNICAST_PEERS
          #value: "10.0.148.40,10.0.160.234,10.0.199.110"
        - name: OPENSHIFT_HA_IPTABLES_CHAIN

8


          value: "INPUT"
        #- name: OPENSHIFT_HA_NOTIFY_SCRIPT

9


        #  value: /etc/keepalive/mynotifyscript.sh
        - name: OPENSHIFT_HA_CHECK_SCRIPT

10


          value: "/etc/keepalive/mycheckscript.sh"
        - name: OPENSHIFT_HA_PREEMPTION

11


          value: "preempt_delay 300"
        - name: OPENSHIFT_HA_CHECK_INTERVAL

12


          value: "2"
        livenessProbe:
          initialDelaySeconds: 10
          exec:
            command:
            - pgrep
            - keepalived
      volumes:
      - name: lib-modules
        hostPath:
          path: /lib/modules
      - name: host-slash
        hostPath:
          path: /
      - name: etc-sysconfig
        hostPath:
          path: /etc/sysconfig
      # config-volume contains the check script
      # created with `oc create configmap keepalived-checkscript --from-file=mycheckscript.sh`
      - configMap:
          defaultMode: 0755
          name: keepalived-checkscript
        name: config-volume
      imagePullSecrets:
        - name: openshift-pull-secret

13

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1: The name of the IP failover deployment.
2: The list of IP address ranges to replicate. This must be provided. For example, 1.2.3.4-6,1.2.3.9.
3: The number of groups to create for VRRP. If not set, a group is created for each virtual IP range specified with the OPENSHIFT_HA_VIP_GROUPS variable.
4: The interface name that IP failover uses to send VRRP traffic. By default, eth0 is used.
5: The IP failover pod tries to open a TCP connection to this port on each VIP. If connection is established, the service is considered to be running. If this port is set to 0, the test always passes. The default value is 80.
6: The offset value used to set the virtual router IDs. Using different offset values allows multiple IP failover configurations to exist within the same cluster. The default offset is 0, and the allowed range is 0 through 255.
7: The number of replicas to create. This must match spec.replicas value in IP failover deployment configuration. The default value is 2.
8: The name of the iptables chain to automatically add an iptables rule to allow the VRRP traffic on. If the value is not set, an iptables rule is not added. If the chain does not exist, it is not created, and Keepalived operates in unicast mode. The default is INPUT.
9: The full path name in the pod file system of a script that is run whenever the state changes.
10: The full path name in the pod file system of a script that is periodically run to verify the application is operating.
11: The strategy for handling a new higher priority host. The default value is preempt_delay 300, which causes a Keepalived instance to take over a VIP after 5 minutes if a lower-priority master is holding the VIP.
12: The period, in seconds, that the check script is run. The default value is 2.
13: Create the pull secret before creating the deployment, otherwise you will get an error when creating the deployment.

14.3. Configuring check and notify scripts

Keepalived monitors the health of the application by periodically running an optional user-supplied check script. For example, the script can test a web server by issuing a request and verifying the response. As cluster administrator, you can provide an optional notify script, which is called whenever the state changes.

The check and notify scripts run in the IP failover pod and use the pod file system, not the host file system. However, the IP failover pod makes the host file system available under the /hosts mount path. When configuring a check or notify script, you must provide the full path to the script. The recommended approach for providing the scripts is to use a ConfigMap object.

The full path names of the check and notify scripts are added to the Keepalived configuration file, _/etc/keepalived/keepalived.conf, which is loaded every time Keepalived starts. The scripts can be added to the pod with a ConfigMap object as described in the following methods.

Check script

When a check script is not provided, a simple default script is run that tests the TCP connection. This default test is suppressed when the monitor port is 0.

Each IP failover pod manages a Keepalived daemon that manages one or more virtual IP (VIP) addresses on the node where the pod is running. The Keepalived daemon keeps the state of each VIP for that node. A particular VIP on a particular node might be in master, backup, or fault state.

If the check script returns non-zero, the node enters the backup state, and any VIPs it holds are reassigned.

Notify script

Keepalived passes the following three parameters to the notify script:

$1 - group or instance
$2 - Name of the group or instance
$3 - The new state: master, backup, or fault

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.

Procedure

Create the desired script and create a ConfigMap object to hold it. The script has no input arguments and must return 0 for OK and 1 for fail.

The check script, mycheckscript.sh:

#!/bin/bash
    # Whatever tests are needed
    # E.g., send request and verify response
exit 0

#!/bin/bash
    # Whatever tests are needed
    # E.g., send request and verify response
exit 0

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Create the ConfigMap object :

oc create configmap mycustomcheck --from-file=mycheckscript.sh

$ oc create configmap mycustomcheck --from-file=mycheckscript.sh

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Add the script to the pod. The defaultMode for the mounted ConfigMap object files must able to run by using oc commands or by editing the deployment configuration. A value of 0755, 493 decimal, is typical:

oc set env deploy/ipfailover-keepalived \
    OPENSHIFT_HA_CHECK_SCRIPT=/etc/keepalive/mycheckscript.sh

$ oc set env deploy/ipfailover-keepalived \
    OPENSHIFT_HA_CHECK_SCRIPT=/etc/keepalive/mycheckscript.sh

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oc set volume deploy/ipfailover-keepalived --add --overwrite \
    --name=config-volume \
    --mount-path=/etc/keepalive \
    --source='{"configMap": { "name": "mycustomcheck", "defaultMode": 493}}'

$ oc set volume deploy/ipfailover-keepalived --add --overwrite \
    --name=config-volume \
    --mount-path=/etc/keepalive \
    --source='{"configMap": { "name": "mycustomcheck", "defaultMode": 493}}'

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Note

The oc set env command is whitespace sensitive. There must be no whitespace on either side of the = sign.

Tip

You can alternatively edit the ipfailover-keepalived deployment configuration:

oc edit deploy ipfailover-keepalived

$ oc edit deploy ipfailover-keepalived

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    spec:
      containers:
      - env:
        - name: OPENSHIFT_HA_CHECK_SCRIPT  
          value: /etc/keepalive/mycheckscript.sh
...
        volumeMounts: 
        - mountPath: /etc/keepalive
          name: config-volume
      dnsPolicy: ClusterFirst
...
      volumes: 
      - configMap:
          defaultMode: 0755 
          name: customrouter
        name: config-volume
...

    spec:
      containers:
      - env:
        - name: OPENSHIFT_HA_CHECK_SCRIPT

1


          value: /etc/keepalive/mycheckscript.sh
...
        volumeMounts:

2


        - mountPath: /etc/keepalive
          name: config-volume
      dnsPolicy: ClusterFirst
...
      volumes:

3


      - configMap:
          defaultMode: 0755

4


          name: customrouter
        name: config-volume
...

Copy to Clipboard

1: In the spec.container.env field, add the OPENSHIFT_HA_CHECK_SCRIPT environment variable to point to the mounted script file.
2: Add the spec.container.volumeMounts field to create the mount point.
3: Add a new spec.volumes field to mention the config map.
4: This sets run permission on the files. When read back, it is displayed in decimal, 493.

Save the changes and exit the editor. This restarts ipfailover-keepalived.

14.4. Configuring VRRP preemption

When a Virtual IP (VIP) on a node leaves the fault state by passing the check script, the VIP on the node enters the backup state if it has lower priority than the VIP on the node that is currently in the master state. The nopreempt strategy does not move master from the lower priority VIP on the host to the higher priority VIP on the host. With preempt_delay 300, the default, Keepalived waits the specified 300 seconds and moves master to the higher priority VIP on the host.

Procedure

To specify preemption enter oc edit deploy ipfailover-keepalived to edit the router deployment configuration:
```
oc edit deploy ipfailover-keepalived
```
```
$ oc edit deploy ipfailover-keepalived
```
Copy to Clipboard
```
...
    spec:
      containers:
      - env:
        - name: OPENSHIFT_HA_PREEMPTION  
          value: preempt_delay 300
...
```
```
...
    spec:
      containers:
      - env:
        - name: OPENSHIFT_HA_PREEMPTION  
```
1
```
          value: preempt_delay 300
...
```
Copy to Clipboard
1
Set the OPENSHIFT_HA_PREEMPTION value:
preempt_delay 300: Keepalived waits the specified 300 seconds and moves master to the higher priority VIP on the host. This is the default value.
nopreempt: does not move master from the lower priority VIP on the host to the higher priority VIP on the host.

14.5. Deploying multiple IP failover instances

Each IP failover pod managed by the IP failover deployment configuration, 1 pod per node or replica, runs a Keepalived daemon. As more IP failover deployment configurations are configured, more pods are created and more daemons join into the common Virtual Router Redundancy Protocol (VRRP) negotiation. This negotiation is done by all the Keepalived daemons and it determines which nodes service which virtual IPs (VIP).

Internally, Keepalived assigns a unique vrrp-id to each VIP. The negotiation uses this set of vrrp-ids, when a decision is made, the VIP corresponding to the winning vrrp-id is serviced on the winning node.

Therefore, for every VIP defined in the IP failover deployment configuration, the IP failover pod must assign a corresponding vrrp-id. This is done by starting at OPENSHIFT_HA_VRRP_ID_OFFSET and sequentially assigning the vrrp-ids to the list of VIPs. The vrrp-ids can have values in the range 1..255.

When there are multiple IP failover deployment configurations, you must specify OPENSHIFT_HA_VRRP_ID_OFFSET so that there is room to increase the number of VIPs in the deployment configuration and none of the vrrp-id ranges overlap.

14.6. Configuring IP failover for more than 254 addresses

IP failover management is limited to 254 groups of Virtual IP (VIP) addresses. By default OpenShift Container Platform assigns one IP address to each group. You can use the OPENSHIFT_HA_VIP_GROUPS variable to change this so multiple IP addresses are in each group and define the number of VIP groups available for each Virtual Router Redundancy Protocol (VRRP) instance when configuring IP failover.

Grouping VIPs creates a wider range of allocation of VIPs per VRRP in the case of VRRP failover events, and is useful when all hosts in the cluster have access to a service locally. For example, when a service is being exposed with an ExternalIP.

Note

As a rule for failover, do not limit services, such as the router, to one specific host. Instead, services should be replicated to each host so that in the case of IP failover, the services do not have to be recreated on the new host.

Note

If you are using OpenShift Container Platform health checks, the nature of IP failover and groups means that all instances in the group are not checked. For that reason, the Kubernetes health checks must be used to ensure that services are live.

Prerequisites

You are logged in to the cluster with a user with cluster-admin privileges.

Procedure

To change the number of IP addresses assigned to each group, change the value for the OPENSHIFT_HA_VIP_GROUPS variable, for example:
Example Deployment YAML for IP failover configuration
```
...
    spec:
        env:
        - name: OPENSHIFT_HA_VIP_GROUPS 
          value: "3"
...
```
```
...
    spec:
        env:
        - name: OPENSHIFT_HA_VIP_GROUPS 
```
1
```
          value: "3"
...
```
Copy to Clipboard
1
If OPENSHIFT_HA_VIP_GROUPS is set to 3 in an environment with seven VIPs, it creates three groups, assigning three VIPs to the first group, and two VIPs to the two remaining groups.

Note

If the number of groups set by OPENSHIFT_HA_VIP_GROUPS is fewer than the number of IP addresses set to fail over, the group contains more than one IP address, and all of the addresses move as a single unit.

14.7. High availability For ExternalIP

In non-cloud clusters, IP failover and ExternalIP to a service can be combined. The result is high availability services for users that create services using ExternalIP.

The approach is to specify an spec.ExternalIP.autoAssignCIDRs range of the cluster network configuration, and then use the same range in creating the IP failover configuration.

Because IP failover can support up to a maximum of 255 VIPs for the entire cluster, the spec.ExternalIP.autoAssignCIDRs must be /24 or smaller.

14.8. Removing IP failover

When IP failover is initially configured, the worker nodes in the cluster are modified with an iptables rule that explicitly allows multicast packets on 224.0.0.18 for Keepalived. Because of the change to the nodes, removing IP failover requires running a job to remove the iptables rule and removing the virtual IP addresses used by Keepalived.

Procedure

Optional: Identify and delete any check and notify scripts that are stored as config maps:

Identify whether any pods for IP failover use a config map as a volume:

oc get pod -l ipfailover \
  -o jsonpath="\
{range .items[?(@.spec.volumes[*].configMap)]}

$ oc get pod -l ipfailover \
  -o jsonpath="\
{range .items[?(@.spec.volumes[*].configMap)]}
{'Namespace: '}{.metadata.namespace}
{'Pod:       '}{.metadata.name}
{'Volumes that use config maps:'}
{range .spec.volumes[?(@.configMap)]}  {'volume:    '}{.name}
  {'configMap: '}{.configMap.name}{'\n'}{end}
{end}"

Copy to Clipboard

Example output

Namespace: default
Pod:       keepalived-worker-59df45db9c-2x9mn
Volumes that use config maps:
  volume:    config-volume
  configMap: mycustomcheck

Namespace: default
Pod:       keepalived-worker-59df45db9c-2x9mn
Volumes that use config maps:
  volume:    config-volume
  configMap: mycustomcheck

Copy to Clipboard

If the preceding step provided the names of config maps that are used as volumes, delete the config maps:
```
oc delete configmap <configmap_name>
```
```
$ oc delete configmap <configmap_name>
```
Copy to Clipboard

Identify an existing deployment for IP failover:

oc get deployment -l ipfailover

$ oc get deployment -l ipfailover

Copy to Clipboard

Example output

NAMESPACE   NAME         READY   UP-TO-DATE   AVAILABLE   AGE
default     ipfailover   2/2     2            2           105d

NAMESPACE   NAME         READY   UP-TO-DATE   AVAILABLE   AGE
default     ipfailover   2/2     2            2           105d

Copy to Clipboard

Delete the deployment:

oc delete deployment <ipfailover_deployment_name>

$ oc delete deployment <ipfailover_deployment_name>

Copy to Clipboard

Remove the ipfailover service account:
```
oc delete sa ipfailover
```
```
$ oc delete sa ipfailover
```
Copy to Clipboard

Run a job that removes the IP tables rule that was added when IP failover was initially configured:

Create a file such as remove-ipfailover-job.yaml with contents that are similar to the following example:

apiVersion: batch/v1
kind: Job
metadata:
  generateName: remove-ipfailover-
  labels:
    app: remove-ipfailover
spec:
  template:
    metadata:
      name: remove-ipfailover
    spec:
      containers:
      - name: remove-ipfailover
        image: registry.redhat.io/openshift4/ose-keepalived-ipfailover:v4.13
        command: ["/var/lib/ipfailover/keepalived/remove-failover.sh"]
      nodeSelector: 
        kubernetes.io/hostname: <host_name>  
      restartPolicy: Never

apiVersion: batch/v1
kind: Job
metadata:
  generateName: remove-ipfailover-
  labels:
    app: remove-ipfailover
spec:
  template:
    metadata:
      name: remove-ipfailover
    spec:
      containers:
      - name: remove-ipfailover
        image: registry.redhat.io/openshift4/ose-keepalived-ipfailover:v4.13
        command: ["/var/lib/ipfailover/keepalived/remove-failover.sh"]
      nodeSelector:

1


        kubernetes.io/hostname: <host_name>

2


      restartPolicy: Never

Copy to Clipboard

1: The nodeSelector is likely the same as the selector used in the old IP failover deployment.
2: Run the job for each node in your cluster that was configured for IP failover and replace the hostname each time.

Run the job:

oc create -f remove-ipfailover-job.yaml

$ oc create -f remove-ipfailover-job.yaml

Copy to Clipboard

Example output

job.batch/remove-ipfailover-2h8dm created

job.batch/remove-ipfailover-2h8dm created

Copy to Clipboard

Verification

Confirm that the job removed the initial configuration for IP failover.

oc logs job/remove-ipfailover-2h8dm

$ oc logs job/remove-ipfailover-2h8dm

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Example output

remove-failover.sh: OpenShift IP Failover service terminating.
  - Removing ip_vs module ...
  - Cleaning up ...
  - Releasing VIPs  (interface eth0) ...

remove-failover.sh: OpenShift IP Failover service terminating.
  - Removing ip_vs module ...
  - Cleaning up ...
  - Releasing VIPs  (interface eth0) ...

Copy to Clipboard

Chapter 15. Configuring interface-level network sysctls

In Linux, sysctl allows an administrator to modify kernel parameters at runtime. You can modify interface-level network sysctls using the tuning Container Network Interface (CNI) meta plugin. The tuning CNI meta plugin operates in a chain with a main CNI plugin as illustrated.

The main CNI plugin assigns the interface and passes this to the tuning CNI meta plugin at runtime. You can change some sysctls and several interface attributes (promiscuous mode, all-multicast mode, MTU, and MAC address) in the network namespace by using the tuning CNI meta plugin. In the tuning CNI meta plugin configuration, the interface name is represented by the IFNAME token, and is replaced with the actual name of the interface at runtime.

Note

In OpenShift Container Platform, the tuning CNI meta plugin only supports changing interface-level network sysctls.

15.1. Configuring the tuning CNI

The following procedure configures the tuning CNI to change the interface-level network net.ipv4.conf.IFNAME.accept_redirects sysctl. This example enables accepting and sending ICMP-redirected packets.

Procedure

Create a network attachment definition, such as tuning-example.yaml, with the following content:

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: <name> 
  namespace: default 
spec:
  config: '{
    "cniVersion": "0.4.0", 
    "name": "<name>", 
    "plugins": [{
       "type": "<main_CNI_plugin>" 
      },
      {
       "type": "tuning", 
       "sysctl": {
            "net.ipv4.conf.IFNAME.accept_redirects": "1" 
        }
      }
     ]
}

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: <name>

1


  namespace: default

2


spec:
  config: '{
    "cniVersion": "0.4.0",

3


    "name": "<name>",

4


    "plugins": [{
       "type": "<main_CNI_plugin>"

5


      },
      {
       "type": "tuning",

6


       "sysctl": {
            "net.ipv4.conf.IFNAME.accept_redirects": "1"

7

Copy to Clipboard

1: Specifies the name for the additional network attachment to create. The name must be unique within the specified namespace.
2: Specifies the namespace that the object is associated with.
3: Specifies the CNI specification version.
4: Specifies the name for the configuration. It is recommended to match the configuration name to the name value of the network attachment definition.
5: Specifies the name of the main CNI plugin to configure.
6: Specifies the name of the CNI meta plugin.
7: Specifies the sysctl to set.

An example yaml file is shown here:

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: tuningnad
  namespace: default
spec:
  config: '{
    "cniVersion": "0.4.0",
    "name": "tuningnad",
    "plugins": [{
      "type": "bridge"
      },
      {
      "type": "tuning",
      "sysctl": {
         "net.ipv4.conf.IFNAME.accept_redirects": "1"
        }
    }
  ]
}'

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: tuningnad
  namespace: default
spec:
  config: '{
    "cniVersion": "0.4.0",
    "name": "tuningnad",
    "plugins": [{
      "type": "bridge"
      },
      {
      "type": "tuning",
      "sysctl": {
         "net.ipv4.conf.IFNAME.accept_redirects": "1"
        }
    }
  ]
}'

Copy to Clipboard

Apply the yaml by running the following command:

oc apply -f tuning-example.yaml

$ oc apply -f tuning-example.yaml

Copy to Clipboard

Example output

networkattachmentdefinition.k8.cni.cncf.io/tuningnad created

networkattachmentdefinition.k8.cni.cncf.io/tuningnad created

Copy to Clipboard

Create a pod such as examplepod.yaml with the network attachment definition similar to the following:

apiVersion: v1
kind: Pod
metadata:
  name: tunepod
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/networks: tuningnad 
spec:
  containers:
  - name: podexample
    image: centos
    command: ["/bin/bash", "-c", "sleep INF"]
    securityContext:
      runAsUser: 2000 
      runAsGroup: 3000 
      allowPrivilegeEscalation: false 
      capabilities: 
        drop: ["ALL"]
  securityContext:
    runAsNonRoot: true 
    seccompProfile: 
      type: RuntimeDefault

apiVersion: v1
kind: Pod
metadata:
  name: tunepod
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/networks: tuningnad

1


spec:
  containers:
  - name: podexample
    image: centos
    command: ["/bin/bash", "-c", "sleep INF"]
    securityContext:
      runAsUser: 2000

2


      runAsGroup: 3000

3


      allowPrivilegeEscalation: false

4


      capabilities:

5


        drop: ["ALL"]
  securityContext:
    runAsNonRoot: true

6


    seccompProfile:

7


      type: RuntimeDefault

Copy to Clipboard

1: Specify the name of the configured NetworkAttachmentDefinition.
2: runAsUser controls which user ID the container is run with.
3: runAsGroup controls which primary group ID the containers is run with.
4: allowPrivilegeEscalation determines if a pod can request to allow privilege escalation. If unspecified, it defaults to true. This boolean directly controls whether the no_new_privs flag gets set on the container process.
5: capabilities permit privileged actions without giving full root access. This policy ensures all capabilities are dropped from the pod.
6: runAsNonRoot: true requires that the container will run with a user with any UID other than 0.
7: RuntimeDefault enables the default seccomp profile for a pod or container workload.

Apply the yaml by running the following command:
```
oc apply -f examplepod.yaml
```
```
$ oc apply -f examplepod.yaml
```
Copy to Clipboard

Verify that the pod is created by running the following command:

oc get pod

$ oc get pod

Copy to Clipboard

Example output

NAME      READY   STATUS    RESTARTS   AGE
tunepod   1/1     Running   0          47s

NAME      READY   STATUS    RESTARTS   AGE
tunepod   1/1     Running   0          47s

Copy to Clipboard

Log in to the pod by running the following command:
```
oc rsh tunepod
```
```
$ oc rsh tunepod
```
Copy to Clipboard
Verify the values of the configured sysctl flags. For example, find the value net.ipv4.conf.net1.accept_redirects by running the following command:
```
sysctl net.ipv4.conf.net1.accept_redirects
```
```
sh-4.4# sysctl net.ipv4.conf.net1.accept_redirects
```
Copy to Clipboard
Expected output
```
net.ipv4.conf.net1.accept_redirects = 1
```
```
net.ipv4.conf.net1.accept_redirects = 1
```
Copy to Clipboard

Chapter 16. Using the Stream Control Transmission Protocol (SCTP)

As a cluster administrator, you can use the Stream Control Transmission Protocol (SCTP) on a bare-metal cluster.

16.1. Support for SCTP on OpenShift Container Platform

As a cluster administrator, you can enable SCTP on the hosts in the cluster. On Red Hat Enterprise Linux CoreOS (RHCOS), the SCTP module is disabled by default.

SCTP is a reliable message based protocol that runs on top of an IP network.

When enabled, you can use SCTP as a protocol with pods, services, and network policy. A Service object must be defined with the type parameter set to either the ClusterIP or NodePort value.

16.1.1. Example configurations using SCTP protocol

You can configure a pod or service to use SCTP by setting the protocol parameter to the SCTP value in the pod or service object.

In the following example, a pod is configured to use SCTP:

apiVersion: v1
kind: Pod
metadata:
  namespace: project1
  name: example-pod
spec:
  containers:
    - name: example-pod
...
      ports:
        - containerPort: 30100
          name: sctpserver
          protocol: SCTP

apiVersion: v1
kind: Pod
metadata:
  namespace: project1
  name: example-pod
spec:
  containers:
    - name: example-pod
...
      ports:
        - containerPort: 30100
          name: sctpserver
          protocol: SCTP

Copy to Clipboard

In the following example, a service is configured to use SCTP:

apiVersion: v1
kind: Service
metadata:
  namespace: project1
  name: sctpserver
spec:
...
  ports:
    - name: sctpserver
      protocol: SCTP
      port: 30100
      targetPort: 30100
  type: ClusterIP

apiVersion: v1
kind: Service
metadata:
  namespace: project1
  name: sctpserver
spec:
...
  ports:
    - name: sctpserver
      protocol: SCTP
      port: 30100
      targetPort: 30100
  type: ClusterIP

Copy to Clipboard

In the following example, a NetworkPolicy object is configured to apply to SCTP network traffic on port 80 from any pods with a specific label:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-sctp-on-http
spec:
  podSelector:
    matchLabels:
      role: web
  ingress:
  - ports:
    - protocol: SCTP
      port: 80

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-sctp-on-http
spec:
  podSelector:
    matchLabels:
      role: web
  ingress:
  - ports:
    - protocol: SCTP
      port: 80

Copy to Clipboard

16.2. Enabling Stream Control Transmission Protocol (SCTP)

As a cluster administrator, you can load and enable the blacklisted SCTP kernel module on worker nodes in your cluster.

Prerequisites

Install the OpenShift CLI (oc).
Access to the cluster as a user with the cluster-admin role.

Procedure

Create a file named load-sctp-module.yaml that contains the following YAML definition:

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  name: load-sctp-module
  labels:
    machineconfiguration.openshift.io/role: worker
spec:
  config:
    ignition:
      version: 3.2.0
    storage:
      files:
        - path: /etc/modprobe.d/sctp-blacklist.conf
          mode: 0644
          overwrite: true
          contents:
            source: data:,
        - path: /etc/modules-load.d/sctp-load.conf
          mode: 0644
          overwrite: true
          contents:
            source: data:,sctp

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  name: load-sctp-module
  labels:
    machineconfiguration.openshift.io/role: worker
spec:
  config:
    ignition:
      version: 3.2.0
    storage:
      files:
        - path: /etc/modprobe.d/sctp-blacklist.conf
          mode: 0644
          overwrite: true
          contents:
            source: data:,
        - path: /etc/modules-load.d/sctp-load.conf
          mode: 0644
          overwrite: true
          contents:
            source: data:,sctp

Copy to Clipboard

To create the MachineConfig object, enter the following command:
```
oc create -f load-sctp-module.yaml
```
```
$ oc create -f load-sctp-module.yaml
```
Copy to Clipboard
Optional: To watch the status of the nodes while the MachineConfig Operator applies the configuration change, enter the following command. When the status of a node transitions to Ready, the configuration update is applied.
```
oc get nodes
```
```
$ oc get nodes
```
Copy to Clipboard

16.3. Verifying Stream Control Transmission Protocol (SCTP) is enabled

You can verify that SCTP is working on a cluster by creating a pod with an application that listens for SCTP traffic, associating it with a service, and then connecting to the exposed service.

Prerequisites

Access to the internet from the cluster to install the nc package.
Install the OpenShift CLI (oc).
Access to the cluster as a user with the cluster-admin role.

Procedure

Create a pod starts an SCTP listener:

Create a file named sctp-server.yaml that defines a pod with the following YAML:

apiVersion: v1
kind: Pod
metadata:
  name: sctpserver
  labels:
    app: sctpserver
spec:
  containers:
    - name: sctpserver
      image: registry.access.redhat.com/ubi9/ubi
      command: ["/bin/sh", "-c"]
      args:
        ["dnf install -y nc && sleep inf"]
      ports:
        - containerPort: 30102
          name: sctpserver
          protocol: SCTP

apiVersion: v1
kind: Pod
metadata:
  name: sctpserver
  labels:
    app: sctpserver
spec:
  containers:
    - name: sctpserver
      image: registry.access.redhat.com/ubi9/ubi
      command: ["/bin/sh", "-c"]
      args:
        ["dnf install -y nc && sleep inf"]
      ports:
        - containerPort: 30102
          name: sctpserver
          protocol: SCTP

Copy to Clipboard

Create the pod by entering the following command:
```
oc create -f sctp-server.yaml
```
```
$ oc create -f sctp-server.yaml
```
Copy to Clipboard

Create a service for the SCTP listener pod.

Create a file named sctp-service.yaml that defines a service with the following YAML:

apiVersion: v1
kind: Service
metadata:
  name: sctpservice
  labels:
    app: sctpserver
spec:
  type: NodePort
  selector:
    app: sctpserver
  ports:
    - name: sctpserver
      protocol: SCTP
      port: 30102
      targetPort: 30102

apiVersion: v1
kind: Service
metadata:
  name: sctpservice
  labels:
    app: sctpserver
spec:
  type: NodePort
  selector:
    app: sctpserver
  ports:
    - name: sctpserver
      protocol: SCTP
      port: 30102
      targetPort: 30102

Copy to Clipboard

To create the service, enter the following command:
```
oc create -f sctp-service.yaml
```
```
$ oc create -f sctp-service.yaml
```
Copy to Clipboard

Create a pod for the SCTP client.

Create a file named sctp-client.yaml with the following YAML:

apiVersion: v1
kind: Pod
metadata:
  name: sctpclient
  labels:
    app: sctpclient
spec:
  containers:
    - name: sctpclient
      image: registry.access.redhat.com/ubi9/ubi
      command: ["/bin/sh", "-c"]
      args:
        ["dnf install -y nc && sleep inf"]

apiVersion: v1
kind: Pod
metadata:
  name: sctpclient
  labels:
    app: sctpclient
spec:
  containers:
    - name: sctpclient
      image: registry.access.redhat.com/ubi9/ubi
      command: ["/bin/sh", "-c"]
      args:
        ["dnf install -y nc && sleep inf"]

Copy to Clipboard

To create the Pod object, enter the following command:
```
oc apply -f sctp-client.yaml
```
```
$ oc apply -f sctp-client.yaml
```
Copy to Clipboard

Run an SCTP listener on the server.
1. To connect to the server pod, enter the following command:
  $ oc rsh sctpserver
  Copy to Clipboard
2. To start the SCTP listener, enter the following command:
  $ nc -l 30102 --sctp
  Copy to Clipboard
Connect to the SCTP listener on the server.
1. Open a new terminal window or tab in your terminal program.
2. Obtain the IP address of the sctpservice service. Enter the following command:
  $ oc get services sctpservice -o go-template='{{.spec.clusterIP}}{{"\n"}}'
  Copy to Clipboard
3. To connect to the client pod, enter the following command:
  $ oc rsh sctpclient
  Copy to Clipboard
4. To start the SCTP client, enter the following command. Replace <cluster_IP> with the cluster IP address of the sctpservice service.
  # nc <cluster_IP> 30102 --sctp
  Copy to Clipboard

Chapter 17. Using Precision Time Protocol (PTP) hardware

You can configure linuxptp services and use PTP-capable hardware in OpenShift Container Platform cluster nodes.

17.1. About PTP hardware

You can use the OpenShift Container Platform console or OpenShift CLI (oc) to install PTP by deploying the PTP Operator. The PTP Operator creates and manages the linuxptp services and provides the following features:

Discovery of the PTP-capable devices in the cluster.
Management of the configuration of linuxptp services.
Notification of PTP clock events that negatively affect the performance and reliability of your application with the PTP Operator cloud-event-proxy sidecar.

Note

The PTP Operator works with PTP-capable devices on clusters provisioned only on bare-metal infrastructure.

17.2. About PTP

Precision Time Protocol (PTP) is used to synchronize clocks in a network. When used in conjunction with hardware support, PTP is capable of sub-microsecond accuracy, and is more accurate than Network Time Protocol (NTP).

17.2.1. Elements of a PTP domain

PTP is used to synchronize multiple nodes connected in a network, with clocks for each node. The clocks synchronized by PTP are organized in a source-destination hierarchy. The hierarchy is created and updated automatically by the best master clock (BMC) algorithm, which runs on every clock. Destination clocks are synchronized to source clocks, and destination clocks can themselves be the source for other downstream clocks. The three primary types of PTP clocks are described below.

Grandmaster clock: The grandmaster clock provides standard time information to other clocks across the network and ensures accurate and stable synchronisation. It writes time stamps and responds to time requests from other clocks. Grandmaster clocks synchronize to a Global Navigation Satellite System (GNSS) time source. The Grandmaster clock is the authoritative source of time in the network and is responsible for providing time synchronization to all other devices.
Ordinary clock: The ordinary clock has a single port connection that can play the role of source or destination clock, depending on its position in the network. The ordinary clock can read and write time stamps.
Boundary clock: The boundary clock has ports in two or more communication paths and can be a source and a destination to other destination clocks at the same time. The boundary clock works as a destination clock upstream. The destination clock receives the timing message, adjusts for delay, and then creates a new source time signal to pass down the network. The boundary clock produces a new timing packet that is still correctly synced with the source clock and can reduce the number of connected devices reporting directly to the source clock.

17.2.2. Advantages of PTP over NTP

One of the main advantages that PTP has over NTP is the hardware support present in various network interface controllers (NIC) and network switches. The specialized hardware allows PTP to account for delays in message transfer and improves the accuracy of time synchronization. To achieve the best possible accuracy, it is recommended that all networking components between PTP clocks are PTP hardware enabled.

Hardware-based PTP provides optimal accuracy, since the NIC can time stamp the PTP packets at the exact moment they are sent and received. Compare this to software-based PTP, which requires additional processing of the PTP packets by the operating system.

Important

Before enabling PTP, ensure that NTP is disabled for the required nodes. You can disable the chrony time service (chronyd) using a MachineConfig custom resource. For more information, see Disabling chrony time service.

17.2.3. Using PTP with dual NIC hardware

OpenShift Container Platform supports single and dual NIC hardware for precision PTP timing in the cluster.

For 5G telco networks that deliver mid-band spectrum coverage, each virtual distributed unit (vDU) requires connections to 6 radio units (RUs). To make these connections, each vDU host requires 2 NICs configured as boundary clocks.

Dual NIC hardware allows you to connect each NIC to the same upstream leader clock with separate ptp4l instances for each NIC feeding the downstream clocks.

17.3. Overview of linuxptp in OpenShift Container Platform nodes

OpenShift Container Platform uses PTP and linuxptp for high precision system timing in bare-metal infrastructure. The linuxptp package includes the ts2phc, pmc, ptp4l, and phc2sys programs for system clock synchronization.

ts2phc

ts2phc synchronizes the PTP hardware clock (PHC) across PTP devices with a high degree of precision. ts2phc is used in grandmaster clock configurations. It receives the precision timing signal a high precision clock source such as Global Navigation Satellite System (GNSS). GNSS provides an accurate and reliable source of synchronized time for use in large distributed networks. GNSS clocks typically provide time information with a precision of a few nanoseconds.

The ts2phc system daemon sends timing information from the grandmaster clock to other PTP devices in the network by reading time information from the grandmaster clock and converting it to PHC format. PHC time is used by other devices in the network to synchronize their clocks with the grandmaster clock.

pmc

pmc implements a PTP management client (pmc) according to IEEE standard 1588.1588. pmc provides basic management access for the ptp4l system daemon. pmc reads from standard input and sends the output over the selected transport, printing any replies it receives.

ptp4l

ptp4l implements the PTP boundary clock and ordinary clock and runs as a system daemon. ptp4l does the following:

Synchronizes the PHC to the source clock with hardware time stamping
Synchronizes the system clock to the source clock with software time stamping

phc2sys

phc2sys synchronizes the system clock to the PHC on the network interface controller (NIC). The phc2sys system daemon continuously monitors the PHC for timing information. When it detects a timing error, the PHC corrects the system clock.

17.4. Installing the PTP Operator using the CLI

As a cluster administrator, you can install the Operator by using the CLI.

Prerequisites

A cluster installed on bare-metal hardware with nodes that have hardware that supports PTP.
Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create a namespace for the PTP Operator.

Save the following YAML in the ptp-namespace.yaml file:

apiVersion: v1
kind: Namespace
metadata:
  name: openshift-ptp
  annotations:
    workload.openshift.io/allowed: management
  labels:
    name: openshift-ptp
    openshift.io/cluster-monitoring: "true"

apiVersion: v1
kind: Namespace
metadata:
  name: openshift-ptp
  annotations:
    workload.openshift.io/allowed: management
  labels:
    name: openshift-ptp
    openshift.io/cluster-monitoring: "true"

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Create the Namespace CR:

oc create -f ptp-namespace.yaml

$ oc create -f ptp-namespace.yaml

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Create an Operator group for the PTP Operator.

Save the following YAML in the ptp-operatorgroup.yaml file:

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: ptp-operators
  namespace: openshift-ptp
spec:
  targetNamespaces:
  - openshift-ptp

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: ptp-operators
  namespace: openshift-ptp
spec:
  targetNamespaces:
  - openshift-ptp

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Create the OperatorGroup CR:

oc create -f ptp-operatorgroup.yaml

$ oc create -f ptp-operatorgroup.yaml

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Subscribe to the PTP Operator.

Save the following YAML in the ptp-sub.yaml file:

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: ptp-operator-subscription
  namespace: openshift-ptp
spec:
  channel: "stable"
  name: ptp-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: ptp-operator-subscription
  namespace: openshift-ptp
spec:
  channel: "stable"
  name: ptp-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace

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Create the Subscription CR:

oc create -f ptp-sub.yaml

$ oc create -f ptp-sub.yaml

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To verify that the Operator is installed, enter the following command:

oc get csv -n openshift-ptp -o custom-columns=Name:.metadata.name,Phase:.status.phase

$ oc get csv -n openshift-ptp -o custom-columns=Name:.metadata.name,Phase:.status.phase

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Example output

Name                         Phase
4.13.0-202301261535          Succeeded

Name                         Phase
4.13.0-202301261535          Succeeded

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17.5. Installing the PTP Operator using the web console

As a cluster administrator, you can install the PTP Operator using the web console.

Note

You have to create the namespace and Operator group as mentioned in the previous section.

Procedure

Install the PTP Operator using the OpenShift Container Platform web console:
1. In the OpenShift Container Platform web console, click Operators → OperatorHub.
2. Choose PTP Operator from the list of available Operators, and then click Install.
3. On the Install Operator page, under A specific namespace on the cluster select openshift-ptp. Then, click Install.
Optional: Verify that the PTP Operator installed successfully:
1. Switch to the Operators → Installed Operators page.
2. Ensure that PTP Operator is listed in the openshift-ptp project with a Status of InstallSucceeded.
  Note
  During installation an Operator might display a Failed status. If the installation later succeeds with an InstallSucceeded message, you can ignore the Failed message.
  If the Operator does not appear as installed, to troubleshoot further:
  - Go to the Operators → Installed Operators page and inspect the Operator Subscriptions and Install Plans tabs for any failure or errors under Status.
  - Go to the Workloads → Pods page and check the logs for pods in the openshift-ptp project.

17.6. Configuring PTP devices

The PTP Operator adds the NodePtpDevice.ptp.openshift.io custom resource definition (CRD) to OpenShift Container Platform.

When installed, the PTP Operator searches your cluster for PTP-capable network devices on each node. It creates and updates a NodePtpDevice custom resource (CR) object for each node that provides a compatible PTP-capable network device.

17.6.1. Discovering PTP-capable network devices in your cluster

Identify PTP-capable network devices that exist in your cluster so that you can configure them

Prerequisties

You installed the PTP Operator.

Procedure

To return a complete list of PTP capable network devices in your cluster, run the following command:

oc get NodePtpDevice -n openshift-ptp -o yaml

$ oc get NodePtpDevice -n openshift-ptp -o yaml

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Example output

apiVersion: v1
items:
- apiVersion: ptp.openshift.io/v1
  kind: NodePtpDevice
  metadata:
    creationTimestamp: "2022-01-27T15:16:28Z"
    generation: 1
    name: dev-worker-0 
    namespace: openshift-ptp
    resourceVersion: "6538103"
    uid: d42fc9ad-bcbf-4590-b6d8-b676c642781a
  spec: {}
  status:
    devices: 
    - name: eno1
    - name: eno2
    - name: eno3
    - name: eno4
    - name: enp5s0f0
    - name: enp5s0f1
...

apiVersion: v1
items:
- apiVersion: ptp.openshift.io/v1
  kind: NodePtpDevice
  metadata:
    creationTimestamp: "2022-01-27T15:16:28Z"
    generation: 1
    name: dev-worker-0

1


    namespace: openshift-ptp
    resourceVersion: "6538103"
    uid: d42fc9ad-bcbf-4590-b6d8-b676c642781a
  spec: {}
  status:
    devices:

2


    - name: eno1
    - name: eno2
    - name: eno3
    - name: eno4
    - name: enp5s0f0
    - name: enp5s0f1
...

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1: The value for the name parameter is the same as the name of the parent node.
2: The devices collection includes a list of the PTP capable devices that the PTP Operator discovers for the node.

17.6.2. Configuring linuxptp services as a grandmaster clock

You can configure the linuxptp services (ptp4l, phc2sys, ts2phc) as a grandmaster clock (T-GM) by creating a PtpConfig custom resource (CR) that configures the host NIC.

The ts2phc utility allows you to synchronize the system clock with the PTP grandmaster clock so that the node can stream precision clock signal to downstream PTP ordinary clocks and boundary clocks.

Note

Use the following example PtpConfig CR as the basis to configure linuxptp services as the grandmaster clock for your particular hardware and environment. This example CR does not configure PTP fast events. To configure PTP fast events, set appropriate values for ptp4lOpts, ptp4lConf, and ptpClockThreshold. ptpClockThreshold is used only when events are enabled. See "Configuring the PTP fast event notifications publisher" for more information.

Prerequisites

For T-GM clocks in production environments, install an Intel E810 Westport Channel NIC in the bare-metal cluster host.
Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.
Install the PTP Operator.

Procedure

Create the PtpConfig resource. For example:

Depending on your requirements, use one of the following T-GM configurations for your deployment. Save the YAML in the grandmaster-clock-ptp-config.yaml file:

Example 17.1. Example PTP grandmaster clock configuration

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: grandmaster-clock
  namespace: openshift-ptp
  annotations: {}
spec:
  profile:
    - name: grandmaster-clock
      # The interface name is hardware-specific
      interface: $interface
      ptp4lOpts: "-2"
      phc2sysOpts: "-a -r -r -n 24"
      ptpSchedulingPolicy: SCHED_FIFO
      ptpSchedulingPriority: 10
      ptpSettings:
        logReduce: "true"
      ptp4lConf: |
        [global]
        #
        # Default Data Set
        #
        twoStepFlag 1
        slaveOnly 0
        priority1 128
        priority2 128
        domainNumber 24
        #utc_offset 37
        clockClass 255
        clockAccuracy 0xFE
        offsetScaledLogVariance 0xFFFF
        free_running 0
        freq_est_interval 1
        dscp_event 0
        dscp_general 0
        dataset_comparison G.8275.x
        G.8275.defaultDS.localPriority 128
        #
        # Port Data Set
        #
        logAnnounceInterval -3
        logSyncInterval -4
        logMinDelayReqInterval -4
        logMinPdelayReqInterval -4
        announceReceiptTimeout 3
        syncReceiptTimeout 0
        delayAsymmetry 0
        fault_reset_interval -4
        neighborPropDelayThresh 20000000
        masterOnly 0
        G.8275.portDS.localPriority 128
        #
        # Run time options
        #
        assume_two_step 0
        logging_level 6
        path_trace_enabled 0
        follow_up_info 0
        hybrid_e2e 0
        inhibit_multicast_service 0
        net_sync_monitor 0
        tc_spanning_tree 0
        tx_timestamp_timeout 50
        unicast_listen 0
        unicast_master_table 0
        unicast_req_duration 3600
        use_syslog 1
        verbose 0
        summary_interval 0
        kernel_leap 1
        check_fup_sync 0
        clock_class_threshold 7
        #
        # Servo Options
        #
        pi_proportional_const 0.0
        pi_integral_const 0.0
        pi_proportional_scale 0.0
        pi_proportional_exponent -0.3
        pi_proportional_norm_max 0.7
        pi_integral_scale 0.0
        pi_integral_exponent 0.4
        pi_integral_norm_max 0.3
        step_threshold 2.0
        first_step_threshold 0.00002
        max_frequency 900000000
        clock_servo pi
        sanity_freq_limit 200000000
        ntpshm_segment 0
        #
        # Transport options
        #
        transportSpecific 0x0
        ptp_dst_mac 01:1B:19:00:00:00
        p2p_dst_mac 01:80:C2:00:00:0E
        udp_ttl 1
        udp6_scope 0x0E
        uds_address /var/run/ptp4l
        #
        # Default interface options
        #
        clock_type OC
        network_transport L2
        delay_mechanism E2E
        time_stamping hardware
        tsproc_mode filter
        delay_filter moving_median
        delay_filter_length 10
        egressLatency 0
        ingressLatency 0
        boundary_clock_jbod 0
        #
        # Clock description
        #
        productDescription ;;
        revisionData ;;
        manufacturerIdentity 00:00:00
        userDescription ;
        timeSource 0xA0
  recommend:
    - profile: grandmaster-clock
      priority: 4
      match:
        - nodeLabel: "node-role.kubernetes.io/$mcp"

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: grandmaster-clock
  namespace: openshift-ptp
  annotations: {}
spec:
  profile:
    - name: grandmaster-clock
      # The interface name is hardware-specific
      interface: $interface
      ptp4lOpts: "-2"
      phc2sysOpts: "-a -r -r -n 24"
      ptpSchedulingPolicy: SCHED_FIFO
      ptpSchedulingPriority: 10
      ptpSettings:
        logReduce: "true"
      ptp4lConf: |
        [global]
        #
        # Default Data Set
        #
        twoStepFlag 1
        slaveOnly 0
        priority1 128
        priority2 128
        domainNumber 24
        #utc_offset 37
        clockClass 255
        clockAccuracy 0xFE
        offsetScaledLogVariance 0xFFFF
        free_running 0
        freq_est_interval 1
        dscp_event 0
        dscp_general 0
        dataset_comparison G.8275.x
        G.8275.defaultDS.localPriority 128
        #
        # Port Data Set
        #
        logAnnounceInterval -3
        logSyncInterval -4
        logMinDelayReqInterval -4
        logMinPdelayReqInterval -4
        announceReceiptTimeout 3
        syncReceiptTimeout 0
        delayAsymmetry 0
        fault_reset_interval -4
        neighborPropDelayThresh 20000000
        masterOnly 0
        G.8275.portDS.localPriority 128
        #
        # Run time options
        #
        assume_two_step 0
        logging_level 6
        path_trace_enabled 0
        follow_up_info 0
        hybrid_e2e 0
        inhibit_multicast_service 0
        net_sync_monitor 0
        tc_spanning_tree 0
        tx_timestamp_timeout 50
        unicast_listen 0
        unicast_master_table 0
        unicast_req_duration 3600
        use_syslog 1
        verbose 0
        summary_interval 0
        kernel_leap 1
        check_fup_sync 0
        clock_class_threshold 7
        #
        # Servo Options
        #
        pi_proportional_const 0.0
        pi_integral_const 0.0
        pi_proportional_scale 0.0
        pi_proportional_exponent -0.3
        pi_proportional_norm_max 0.7
        pi_integral_scale 0.0
        pi_integral_exponent 0.4
        pi_integral_norm_max 0.3
        step_threshold 2.0
        first_step_threshold 0.00002
        max_frequency 900000000
        clock_servo pi
        sanity_freq_limit 200000000
        ntpshm_segment 0
        #
        # Transport options
        #
        transportSpecific 0x0
        ptp_dst_mac 01:1B:19:00:00:00
        p2p_dst_mac 01:80:C2:00:00:0E
        udp_ttl 1
        udp6_scope 0x0E
        uds_address /var/run/ptp4l
        #
        # Default interface options
        #
        clock_type OC
        network_transport L2
        delay_mechanism E2E
        time_stamping hardware
        tsproc_mode filter
        delay_filter moving_median
        delay_filter_length 10
        egressLatency 0
        ingressLatency 0
        boundary_clock_jbod 0
        #
        # Clock description
        #
        productDescription ;;
        revisionData ;;
        manufacturerIdentity 00:00:00
        userDescription ;
        timeSource 0xA0
  recommend:
    - profile: grandmaster-clock
      priority: 4
      match:
        - nodeLabel: "node-role.kubernetes.io/$mcp"

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Note

The example PTP grandmaster clock configuration is for test purposes only and is not intended for production.

Example 17.2. PTP grandmaster clock configuration for E810 NIC

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: grandmaster
  namespace: openshift-ptp
  annotations:
    ran.openshift.io/ztp-deploy-wave: "10"
spec:
  profile:
  - name: "grandmaster"
    ptp4lOpts: "-2 --summary_interval -4"
    phc2sysOpts: -r -u 0 -m -O -37 -N 8 -R 16 -s $iface_master -n 24
    ptpSchedulingPolicy: SCHED_FIFO
    ptpSchedulingPriority: 10
    ptpSettings:
      logReduce: "true"
    plugins:
      e810:
        enableDefaultConfig: true
    ts2phcOpts: " "
    ts2phcConf: |
      [nmea]
      ts2phc.master 1
      [global]
      use_syslog  0
      verbose 1
      logging_level 7
      ts2phc.pulsewidth 100000000
      ts2phc.nmea_serialport $gnss_serialport
      leapfile  /usr/share/zoneinfo/leap-seconds.list
      [$iface_master]
      ts2phc.extts_polarity rising
      ts2phc.extts_correction 0
    ptp4lConf: |
      [$iface_master]
      masterOnly 1
      [$iface_master_1]
      masterOnly 1
      [$iface_master_2]
      masterOnly 1
      [$iface_master_3]
      masterOnly 1
      [global]
      #
      # Default Data Set
      #
      twoStepFlag 1
      priority1 128
      priority2 128
      domainNumber 24
      #utc_offset 37
      clockClass 6
      clockAccuracy 0x27
      offsetScaledLogVariance 0xFFFF
      free_running 0
      freq_est_interval 1
      dscp_event 0
      dscp_general 0
      dataset_comparison G.8275.x
      G.8275.defaultDS.localPriority 128
      #
      # Port Data Set
      #
      logAnnounceInterval -3
      logSyncInterval -4
      logMinDelayReqInterval -4
      logMinPdelayReqInterval 0
      announceReceiptTimeout 3
      syncReceiptTimeout 0
      delayAsymmetry 0
      fault_reset_interval -4
      neighborPropDelayThresh 20000000
      masterOnly 0
      G.8275.portDS.localPriority 128
      #
      # Run time options
      #
      assume_two_step 0
      logging_level 6
      path_trace_enabled 0
      follow_up_info 0
      hybrid_e2e 0
      inhibit_multicast_service 0
      net_sync_monitor 0
      tc_spanning_tree 0
      tx_timestamp_timeout 50
      unicast_listen 0
      unicast_master_table 0
      unicast_req_duration 3600
      use_syslog 1
      verbose 0
      summary_interval -4
      kernel_leap 1
      check_fup_sync 0
      clock_class_threshold 7
      #
      # Servo Options
      #
      pi_proportional_const 0.0
      pi_integral_const 0.0
      pi_proportional_scale 0.0
      pi_proportional_exponent -0.3
      pi_proportional_norm_max 0.7
      pi_integral_scale 0.0
      pi_integral_exponent 0.4
      pi_integral_norm_max 0.3
      step_threshold 2.0
      first_step_threshold 0.00002
      clock_servo pi
      sanity_freq_limit  200000000
      ntpshm_segment 0
      #
      # Transport options
      #
      transportSpecific 0x0
      ptp_dst_mac 01:1B:19:00:00:00
      p2p_dst_mac 01:80:C2:00:00:0E
      udp_ttl 1
      udp6_scope 0x0E
      uds_address /var/run/ptp4l
      #
      # Default interface options
      #
      clock_type BC
      network_transport L2
      delay_mechanism E2E
      time_stamping hardware
      tsproc_mode filter
      delay_filter moving_median
      delay_filter_length 10
      egressLatency 0
      ingressLatency 0
      boundary_clock_jbod 0
      #
      # Clock description
      #
      productDescription ;;
      revisionData ;;
      manufacturerIdentity 00:00:00
      userDescription ;
      timeSource 0x20
  recommend:
  - profile: "grandmaster"
    priority: 4
    match:
    - nodeLabel: "node-role.kubernetes.io/$mcp"

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: grandmaster
  namespace: openshift-ptp
  annotations:
    ran.openshift.io/ztp-deploy-wave: "10"
spec:
  profile:
  - name: "grandmaster"
    ptp4lOpts: "-2 --summary_interval -4"
    phc2sysOpts: -r -u 0 -m -O -37 -N 8 -R 16 -s $iface_master -n 24
    ptpSchedulingPolicy: SCHED_FIFO
    ptpSchedulingPriority: 10
    ptpSettings:
      logReduce: "true"
    plugins:
      e810:
        enableDefaultConfig: true
    ts2phcOpts: " "
    ts2phcConf: |
      [nmea]
      ts2phc.master 1
      [global]
      use_syslog  0
      verbose 1
      logging_level 7
      ts2phc.pulsewidth 100000000
      ts2phc.nmea_serialport $gnss_serialport
      leapfile  /usr/share/zoneinfo/leap-seconds.list
      [$iface_master]
      ts2phc.extts_polarity rising
      ts2phc.extts_correction 0
    ptp4lConf: |
      [$iface_master]
      masterOnly 1
      [$iface_master_1]
      masterOnly 1
      [$iface_master_2]
      masterOnly 1
      [$iface_master_3]
      masterOnly 1
      [global]
      #
      # Default Data Set
      #
      twoStepFlag 1
      priority1 128
      priority2 128
      domainNumber 24
      #utc_offset 37
      clockClass 6
      clockAccuracy 0x27
      offsetScaledLogVariance 0xFFFF
      free_running 0
      freq_est_interval 1
      dscp_event 0
      dscp_general 0
      dataset_comparison G.8275.x
      G.8275.defaultDS.localPriority 128
      #
      # Port Data Set
      #
      logAnnounceInterval -3
      logSyncInterval -4
      logMinDelayReqInterval -4
      logMinPdelayReqInterval 0
      announceReceiptTimeout 3
      syncReceiptTimeout 0
      delayAsymmetry 0
      fault_reset_interval -4
      neighborPropDelayThresh 20000000
      masterOnly 0
      G.8275.portDS.localPriority 128
      #
      # Run time options
      #
      assume_two_step 0
      logging_level 6
      path_trace_enabled 0
      follow_up_info 0
      hybrid_e2e 0
      inhibit_multicast_service 0
      net_sync_monitor 0
      tc_spanning_tree 0
      tx_timestamp_timeout 50
      unicast_listen 0
      unicast_master_table 0
      unicast_req_duration 3600
      use_syslog 1
      verbose 0
      summary_interval -4
      kernel_leap 1
      check_fup_sync 0
      clock_class_threshold 7
      #
      # Servo Options
      #
      pi_proportional_const 0.0
      pi_integral_const 0.0
      pi_proportional_scale 0.0
      pi_proportional_exponent -0.3
      pi_proportional_norm_max 0.7
      pi_integral_scale 0.0
      pi_integral_exponent 0.4
      pi_integral_norm_max 0.3
      step_threshold 2.0
      first_step_threshold 0.00002
      clock_servo pi
      sanity_freq_limit  200000000
      ntpshm_segment 0
      #
      # Transport options
      #
      transportSpecific 0x0
      ptp_dst_mac 01:1B:19:00:00:00
      p2p_dst_mac 01:80:C2:00:00:0E
      udp_ttl 1
      udp6_scope 0x0E
      uds_address /var/run/ptp4l
      #
      # Default interface options
      #
      clock_type BC
      network_transport L2
      delay_mechanism E2E
      time_stamping hardware
      tsproc_mode filter
      delay_filter moving_median
      delay_filter_length 10
      egressLatency 0
      ingressLatency 0
      boundary_clock_jbod 0
      #
      # Clock description
      #
      productDescription ;;
      revisionData ;;
      manufacturerIdentity 00:00:00
      userDescription ;
      timeSource 0x20
  recommend:
  - profile: "grandmaster"
    priority: 4
    match:
    - nodeLabel: "node-role.kubernetes.io/$mcp"

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Create the CR by running the following command:

oc create -f grandmaster-clock-ptp-config.yaml

$ oc create -f grandmaster-clock-ptp-config.yaml

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Verification

Check that the PtpConfig profile is applied to the node.

Get the list of pods in the openshift-ptp namespace by running the following command:

oc get pods -n openshift-ptp -o wide

$ oc get pods -n openshift-ptp -o wide

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Example output

NAME                          READY   STATUS    RESTARTS   AGE     IP             NODE
linuxptp-daemon-74m2g         3/3     Running   3          4d15h   10.16.230.7    compute-1.example.com
ptp-operator-5f4f48d7c-x7zkf  1/1     Running   1          4d15h   10.128.1.145   compute-1.example.com

NAME                          READY   STATUS    RESTARTS   AGE     IP             NODE
linuxptp-daemon-74m2g         3/3     Running   3          4d15h   10.16.230.7    compute-1.example.com
ptp-operator-5f4f48d7c-x7zkf  1/1     Running   1          4d15h   10.128.1.145   compute-1.example.com

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Check that the profile is correct. Examine the logs of the linuxptp daemon that corresponds to the node you specified in the PtpConfig profile. Run the following command:

oc logs linuxptp-daemon-74m2g -n openshift-ptp -c linuxptp-daemon-container

$ oc logs linuxptp-daemon-74m2g -n openshift-ptp -c linuxptp-daemon-container

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Example output

ts2phc[94980.334]: [ts2phc.0.config] nmea delay: 98690975 ns
ts2phc[94980.334]: [ts2phc.0.config] ens3f0 extts index 0 at 1676577329.999999999 corr 0 src 1676577330.901342528 diff -1
ts2phc[94980.334]: [ts2phc.0.config] ens3f0 master offset         -1 s2 freq      -1
ts2phc[94980.441]: [ts2phc.0.config] nmea sentence: GNRMC,195453.00,A,4233.24427,N,07126.64420,W,0.008,,160223,,,A,V
phc2sys[94980.450]: [ptp4l.0.config] CLOCK_REALTIME phc offset       943 s2 freq  -89604 delay    504
phc2sys[94980.512]: [ptp4l.0.config] CLOCK_REALTIME phc offset      1000 s2 freq  -89264 delay    474

ts2phc[94980.334]: [ts2phc.0.config] nmea delay: 98690975 ns
ts2phc[94980.334]: [ts2phc.0.config] ens3f0 extts index 0 at 1676577329.999999999 corr 0 src 1676577330.901342528 diff -1
ts2phc[94980.334]: [ts2phc.0.config] ens3f0 master offset         -1 s2 freq      -1
ts2phc[94980.441]: [ts2phc.0.config] nmea sentence: GNRMC,195453.00,A,4233.24427,N,07126.64420,W,0.008,,160223,,,A,V
phc2sys[94980.450]: [ptp4l.0.config] CLOCK_REALTIME phc offset       943 s2 freq  -89604 delay    504
phc2sys[94980.512]: [ptp4l.0.config] CLOCK_REALTIME phc offset      1000 s2 freq  -89264 delay    474

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17.6.2.1. Grandmaster clock PtpConfig configuration reference

The following reference information describes the configuration options for the PtpConfig custom resource (CR) that configures the linuxptp services (ptp4l, phc2sys, ts2phc) as a grandmaster clock.

Table 17.1. PtpConfig configuration options for PTP Grandmaster clock
PtpConfig CR field	Description
`plugins`	Specify an array of `.exec.cmdline` options that configure the NIC for grandmaster clock operation. Grandmaster clock configuration requires certain PTP pins to be disabled. The plugin mechanism allows the PTP Operator to do automated hardware configuration. For the Intel Westport Channel NIC, when `enableDefaultConfig` is true, The PTP Operator runs a hard-coded script to do the required configuration for the NIC.
`ptp4lOpts`	Specify system configuration options for the `ptp4l` service. The options should not include the network interface name `-i <interface>` and service config file `-f /etc/ptp4l.conf` because the network interface name and the service config file are automatically appended.
`ptp4lConf`	Specify the required configuration to start `ptp4l` as a grandmaster clock. For example, the `ens2f1` interface synchronizes downstream connected devices. For grandmaster clocks, set `clockClass` to `6` and set `clockAccuracy` to `0x27`. Set `timeSource` to `0x20` for when receiving the timing signal from a Global navigation satellite system (GNSS).
`tx_timestamp_timeout`	Specify the maximum amount of time to wait for the transmit (TX) timestamp from the sender before discarding the data.
`boundary_clock_jbod`	Specify the JBOD boundary clock time delay value. This value is used to correct the time values that are passed between the network time devices.
`phc2sysOpts`	Specify system config options for the `phc2sys` service. If this field is empty the PTP Operator does not start the `phc2sys` service. Note Ensure that the network interface listed here is configured as grandmaster and is referenced as required in the `ts2phcConf` and `ptp4lConf` fields.
`ptpSchedulingPolicy`	Configure the scheduling policy for `ptp4l` and `phc2sys` processes. Default value is `SCHED_OTHER`. Use `SCHED_FIFO` on systems that support FIFO scheduling.
`ptpSchedulingPriority`	Set an integer value from 1-65 to configure FIFO priority for `ptp4l` and `phc2sys` processes when `ptpSchedulingPolicy` is set to `SCHED_FIFO`. The `ptpSchedulingPriority` field is not used when `ptpSchedulingPolicy` is set to `SCHED_OTHER`.
`ptpClockThreshold`	Optional. If `ptpClockThreshold` stanza is not present, default values are used for `ptpClockThreshold` fields. Stanza shows default `ptpClockThreshold` values. `ptpClockThreshold` values configure how long after the PTP master clock is disconnected before PTP events are triggered. `holdOverTimeout` is the time value in seconds before the PTP clock event state changes to `FREERUN` when the PTP master clock is disconnected. The `maxOffsetThreshold` and `minOffsetThreshold` settings configure offset values in nanoseconds that compare against the values for `CLOCK_REALTIME` (`phc2sys`) or master offset (`ptp4l`). When the `ptp4l` or `phc2sys` offset value is outside this range, the PTP clock state is set to `FREERUN`. When the offset value is within this range, the PTP clock state is set to `LOCKED`.
`ts2phcConf`	Sets the configuration for the `ts2phc` command. `leapfile` is the default path to the current leap seconds definition file in the PTP Operator container image. `ts2phc.nmea_serialport` is the serial port device that is connected to the NMEA GPS clock source. When configured, the GNSS receiver is accessible on `/dev/gnss<id>`. If the host has multiple GNSS receivers, you can find the correct device by enumerating either of the following devices: `/sys/class/net/<eth_port>/device/gnss/` `/sys/class/gnss/gnss<id>/device/`
`ts2phcOpts`	Set options for the `ts2phc` command.
`recommend`	Specify an array of one or more `recommend` objects that define rules on how the `profile` should be applied to nodes.
`.recommend.profile`	Specify the `.recommend.profile` object name that is defined in the `profile` section.
`.recommend.priority`	Specify the `priority` with an integer value between `0` and `99`. A larger number gets lower priority, so a priority of `99` is lower than a priority of `10`. If a node can be matched with multiple profiles according to rules defined in the `match` field, the profile with the higher priority is applied to that node.
`.recommend.match`	Specify `.recommend.match` rules with `nodeLabel` or `nodeName` values.
`.recommend.match.nodeLabel`	Set `nodeLabel` with the `key` of the `node.Labels` field from the node object by using the `oc get nodes --show-labels` command. For example, `node-role.kubernetes.io/worker`.
`.recommend.match.nodeName`	Set `nodeName` with the value of the `node.Name` field from the node object by using the `oc get nodes` command. For example, `compute-1.example.com`.

17.6.3. Configuring linuxptp services as an ordinary clock

You can configure linuxptp services (ptp4l, phc2sys) as ordinary clock by creating a PtpConfig custom resource (CR) object.

Note

Use the following example PtpConfig CR as the basis to configure linuxptp services as an ordinary clock for your particular hardware and environment. This example CR does not configure PTP fast events. To configure PTP fast events, set appropriate values for ptp4lOpts, ptp4lConf, and ptpClockThreshold. ptpClockThreshold is required only when events are enabled. See "Configuring the PTP fast event notifications publisher" for more information.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.
Install the PTP Operator.

Procedure

Create the following PtpConfig CR, and then save the YAML in the ordinary-clock-ptp-config.yaml file.

Example PTP ordinary clock configuration

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: ordinary-clock
  namespace: openshift-ptp
  annotations: {}
spec:
  profile:
    - name: ordinary-clock
      # The interface name is hardware-specific
      interface: $interface
      ptp4lOpts: "-2 -s"
      phc2sysOpts: "-a -r -n 24"
      ptpSchedulingPolicy: SCHED_FIFO
      ptpSchedulingPriority: 10
      ptpSettings:
        logReduce: "true"
      ptp4lConf: |
        [global]
        #
        # Default Data Set
        #
        twoStepFlag 1
        slaveOnly 1
        priority1 128
        priority2 128
        domainNumber 24
        #utc_offset 37
        clockClass 255
        clockAccuracy 0xFE
        offsetScaledLogVariance 0xFFFF
        free_running 0
        freq_est_interval 1
        dscp_event 0
        dscp_general 0
        dataset_comparison G.8275.x
        G.8275.defaultDS.localPriority 128
        #
        # Port Data Set
        #
        logAnnounceInterval -3
        logSyncInterval -4
        logMinDelayReqInterval -4
        logMinPdelayReqInterval -4
        announceReceiptTimeout 3
        syncReceiptTimeout 0
        delayAsymmetry 0
        fault_reset_interval -4
        neighborPropDelayThresh 20000000
        masterOnly 0
        G.8275.portDS.localPriority 128
        #
        # Run time options
        #
        assume_two_step 0
        logging_level 6
        path_trace_enabled 0
        follow_up_info 0
        hybrid_e2e 0
        inhibit_multicast_service 0
        net_sync_monitor 0
        tc_spanning_tree 0
        tx_timestamp_timeout 50
        unicast_listen 0
        unicast_master_table 0
        unicast_req_duration 3600
        use_syslog 1
        verbose 0
        summary_interval 0
        kernel_leap 1
        check_fup_sync 0
        clock_class_threshold 7
        #
        # Servo Options
        #
        pi_proportional_const 0.0
        pi_integral_const 0.0
        pi_proportional_scale 0.0
        pi_proportional_exponent -0.3
        pi_proportional_norm_max 0.7
        pi_integral_scale 0.0
        pi_integral_exponent 0.4
        pi_integral_norm_max 0.3
        step_threshold 2.0
        first_step_threshold 0.00002
        max_frequency 900000000
        clock_servo pi
        sanity_freq_limit 200000000
        ntpshm_segment 0
        #
        # Transport options
        #
        transportSpecific 0x0
        ptp_dst_mac 01:1B:19:00:00:00
        p2p_dst_mac 01:80:C2:00:00:0E
        udp_ttl 1
        udp6_scope 0x0E
        uds_address /var/run/ptp4l
        #
        # Default interface options
        #
        clock_type OC
        network_transport L2
        delay_mechanism E2E
        time_stamping hardware
        tsproc_mode filter
        delay_filter moving_median
        delay_filter_length 10
        egressLatency 0
        ingressLatency 0
        boundary_clock_jbod 0
        #
        # Clock description
        #
        productDescription ;;
        revisionData ;;
        manufacturerIdentity 00:00:00
        userDescription ;
        timeSource 0xA0
  recommend:
    - profile: ordinary-clock
      priority: 4
      match:
        - nodeLabel: "node-role.kubernetes.io/$mcp"

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: ordinary-clock
  namespace: openshift-ptp
  annotations: {}
spec:
  profile:
    - name: ordinary-clock
      # The interface name is hardware-specific
      interface: $interface
      ptp4lOpts: "-2 -s"
      phc2sysOpts: "-a -r -n 24"
      ptpSchedulingPolicy: SCHED_FIFO
      ptpSchedulingPriority: 10
      ptpSettings:
        logReduce: "true"
      ptp4lConf: |
        [global]
        #
        # Default Data Set
        #
        twoStepFlag 1
        slaveOnly 1
        priority1 128
        priority2 128
        domainNumber 24
        #utc_offset 37
        clockClass 255
        clockAccuracy 0xFE
        offsetScaledLogVariance 0xFFFF
        free_running 0
        freq_est_interval 1
        dscp_event 0
        dscp_general 0
        dataset_comparison G.8275.x
        G.8275.defaultDS.localPriority 128
        #
        # Port Data Set
        #
        logAnnounceInterval -3
        logSyncInterval -4
        logMinDelayReqInterval -4
        logMinPdelayReqInterval -4
        announceReceiptTimeout 3
        syncReceiptTimeout 0
        delayAsymmetry 0
        fault_reset_interval -4
        neighborPropDelayThresh 20000000
        masterOnly 0
        G.8275.portDS.localPriority 128
        #
        # Run time options
        #
        assume_two_step 0
        logging_level 6
        path_trace_enabled 0
        follow_up_info 0
        hybrid_e2e 0
        inhibit_multicast_service 0
        net_sync_monitor 0
        tc_spanning_tree 0
        tx_timestamp_timeout 50
        unicast_listen 0
        unicast_master_table 0
        unicast_req_duration 3600
        use_syslog 1
        verbose 0
        summary_interval 0
        kernel_leap 1
        check_fup_sync 0
        clock_class_threshold 7
        #
        # Servo Options
        #
        pi_proportional_const 0.0
        pi_integral_const 0.0
        pi_proportional_scale 0.0
        pi_proportional_exponent -0.3
        pi_proportional_norm_max 0.7
        pi_integral_scale 0.0
        pi_integral_exponent 0.4
        pi_integral_norm_max 0.3
        step_threshold 2.0
        first_step_threshold 0.00002
        max_frequency 900000000
        clock_servo pi
        sanity_freq_limit 200000000
        ntpshm_segment 0
        #
        # Transport options
        #
        transportSpecific 0x0
        ptp_dst_mac 01:1B:19:00:00:00
        p2p_dst_mac 01:80:C2:00:00:0E
        udp_ttl 1
        udp6_scope 0x0E
        uds_address /var/run/ptp4l
        #
        # Default interface options
        #
        clock_type OC
        network_transport L2
        delay_mechanism E2E
        time_stamping hardware
        tsproc_mode filter
        delay_filter moving_median
        delay_filter_length 10
        egressLatency 0
        ingressLatency 0
        boundary_clock_jbod 0
        #
        # Clock description
        #
        productDescription ;;
        revisionData ;;
        manufacturerIdentity 00:00:00
        userDescription ;
        timeSource 0xA0
  recommend:
    - profile: ordinary-clock
      priority: 4
      match:
        - nodeLabel: "node-role.kubernetes.io/$mcp"

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Table 17.2. PTP ordinary clock CR configuration options
Custom resource field	Description
`name`	The name of the `PtpConfig` CR.
`profile`	Specify an array of one or more `profile` objects. Each profile must be uniquely named.
`interface`	Specify the network interface to be used by the `ptp4l` service, for example `ens787f1`.
`ptp4lOpts`	Specify system config options for the `ptp4l` service, for example `-2` to select the IEEE 802.3 network transport. The options should not include the network interface name `-i <interface>` and service config file `-f /etc/ptp4l.conf` because the network interface name and the service config file are automatically appended. Append `--summary_interval -4` to use PTP fast events with this interface.
`phc2sysOpts`	Specify system config options for the `phc2sys` service. If this field is empty, the PTP Operator does not start the `phc2sys` service. For Intel Columbiaville 800 Series NICs, set `phc2sysOpts` options to `-a -r -m -n 24 -N 8 -R 16`. `-m` prints messages to `stdout`. The `linuxptp-daemon` `DaemonSet` parses the logs and generates Prometheus metrics.
`ptp4lConf`	Specify a string that contains the configuration to replace the default `/etc/ptp4l.conf` file. To use the default configuration, leave the field empty.
`tx_timestamp_timeout`	For Intel Columbiaville 800 Series NICs, set `tx_timestamp_timeout` to `50`.
`boundary_clock_jbod`	For Intel Columbiaville 800 Series NICs, set `boundary_clock_jbod` to `0`.
`ptpSchedulingPolicy`	Scheduling policy for `ptp4l` and `phc2sys` processes. Default value is `SCHED_OTHER`. Use `SCHED_FIFO` on systems that support FIFO scheduling.
`ptpSchedulingPriority`	Integer value from 1-65 used to set FIFO priority for `ptp4l` and `phc2sys` processes when `ptpSchedulingPolicy` is set to `SCHED_FIFO`. The `ptpSchedulingPriority` field is not used when `ptpSchedulingPolicy` is set to `SCHED_OTHER`.
`ptpClockThreshold`	Optional. If `ptpClockThreshold` is not present, default values are used for the `ptpClockThreshold` fields. `ptpClockThreshold` configures how long after the PTP master clock is disconnected before PTP events are triggered. `holdOverTimeout` is the time value in seconds before the PTP clock event state changes to `FREERUN` when the PTP master clock is disconnected. The `maxOffsetThreshold` and `minOffsetThreshold` settings configure offset values in nanoseconds that compare against the values for `CLOCK_REALTIME` (`phc2sys`) or master offset (`ptp4l`). When the `ptp4l` or `phc2sys` offset value is outside this range, the PTP clock state is set to `FREERUN`. When the offset value is within this range, the PTP clock state is set to `LOCKED`.
`recommend`	Specify an array of one or more `recommend` objects that define rules on how the `profile` should be applied to nodes.
`.recommend.profile`	Specify the `.recommend.profile` object name defined in the `profile` section.
`.recommend.priority`	Set `.recommend.priority` to `0` for ordinary clock.
`.recommend.match`	Specify `.recommend.match` rules with `nodeLabel` or `nodeName` values.
`.recommend.match.nodeLabel`	Set `nodeLabel` with the `key` of the `node.Labels` field from the node object by using the `oc get nodes --show-labels` command. For example, `node-role.kubernetes.io/worker`.
`.recommend.match.nodeName`	Set `nodeName` with the value of the `node.Name` field from the node object by using the `oc get nodes` command. For example, `compute-1.example.com`.

Create the PtpConfig CR by running the following command:

oc create -f ordinary-clock-ptp-config.yaml

$ oc create -f ordinary-clock-ptp-config.yaml

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Verification

Check that the PtpConfig profile is applied to the node.

Get the list of pods in the openshift-ptp namespace by running the following command:

oc get pods -n openshift-ptp -o wide

$ oc get pods -n openshift-ptp -o wide

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Example output

NAME                            READY   STATUS    RESTARTS   AGE   IP               NODE
linuxptp-daemon-4xkbb           1/1     Running   0          43m   10.1.196.24      compute-0.example.com
linuxptp-daemon-tdspf           1/1     Running   0          43m   10.1.196.25      compute-1.example.com
ptp-operator-657bbb64c8-2f8sj   1/1     Running   0          43m   10.129.0.61      control-plane-1.example.com

NAME                            READY   STATUS    RESTARTS   AGE   IP               NODE
linuxptp-daemon-4xkbb           1/1     Running   0          43m   10.1.196.24      compute-0.example.com
linuxptp-daemon-tdspf           1/1     Running   0          43m   10.1.196.25      compute-1.example.com
ptp-operator-657bbb64c8-2f8sj   1/1     Running   0          43m   10.129.0.61      control-plane-1.example.com

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Check that the profile is correct. Examine the logs of the linuxptp daemon that corresponds to the node you specified in the PtpConfig profile. Run the following command:

oc logs linuxptp-daemon-4xkbb -n openshift-ptp -c linuxptp-daemon-container

$ oc logs linuxptp-daemon-4xkbb -n openshift-ptp -c linuxptp-daemon-container

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Example output

I1115 09:41:17.117596 4143292 daemon.go:107] in applyNodePTPProfile
I1115 09:41:17.117604 4143292 daemon.go:109] updating NodePTPProfile to:
I1115 09:41:17.117607 4143292 daemon.go:110] ------------------------------------
I1115 09:41:17.117612 4143292 daemon.go:102] Profile Name: profile1
I1115 09:41:17.117616 4143292 daemon.go:102] Interface: ens787f1
I1115 09:41:17.117620 4143292 daemon.go:102] Ptp4lOpts: -2 -s
I1115 09:41:17.117623 4143292 daemon.go:102] Phc2sysOpts: -a -r -n 24
I1115 09:41:17.117626 4143292 daemon.go:116] ------------------------------------

I1115 09:41:17.117596 4143292 daemon.go:107] in applyNodePTPProfile
I1115 09:41:17.117604 4143292 daemon.go:109] updating NodePTPProfile to:
I1115 09:41:17.117607 4143292 daemon.go:110] ------------------------------------
I1115 09:41:17.117612 4143292 daemon.go:102] Profile Name: profile1
I1115 09:41:17.117616 4143292 daemon.go:102] Interface: ens787f1
I1115 09:41:17.117620 4143292 daemon.go:102] Ptp4lOpts: -2 -s
I1115 09:41:17.117623 4143292 daemon.go:102] Phc2sysOpts: -a -r -n 24
I1115 09:41:17.117626 4143292 daemon.go:116] ------------------------------------

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17.6.4. Configuring linuxptp services as a boundary clock

You can configure the linuxptp services (ptp4l, phc2sys) as boundary clock by creating a PtpConfig custom resource (CR) object.

Note

Use the following example PtpConfig CR as the basis to configure linuxptp services as the boundary clock for your particular hardware and environment. This example CR does not configure PTP fast events. To configure PTP fast events, set appropriate values for ptp4lOpts, ptp4lConf, and ptpClockThreshold. ptpClockThreshold is used only when events are enabled. See "Configuring the PTP fast event notifications publisher" for more information.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.
Install the PTP Operator.

Procedure

Create the following PtpConfig CR, and then save the YAML in the boundary-clock-ptp-config.yaml file.

Example PTP boundary clock configuration

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: boundary-clock
  namespace: openshift-ptp
  annotations: {}
spec:
  profile:
    - name: boundary-clock
      ptp4lOpts: "-2"
      phc2sysOpts: "-a -r -n 24"
      ptpSchedulingPolicy: SCHED_FIFO
      ptpSchedulingPriority: 10
      ptpSettings:
        logReduce: "true"
      ptp4lConf: |
        # The interface name is hardware-specific
        [$iface_slave]
        masterOnly 0
        [$iface_master_1]
        masterOnly 1
        [$iface_master_2]
        masterOnly 1
        [$iface_master_3]
        masterOnly 1
        [global]
        #
        # Default Data Set
        #
        twoStepFlag 1
        slaveOnly 0
        priority1 128
        priority2 128
        domainNumber 24
        #utc_offset 37
        clockClass 248
        clockAccuracy 0xFE
        offsetScaledLogVariance 0xFFFF
        free_running 0
        freq_est_interval 1
        dscp_event 0
        dscp_general 0
        dataset_comparison G.8275.x
        G.8275.defaultDS.localPriority 128
        #
        # Port Data Set
        #
        logAnnounceInterval -3
        logSyncInterval -4
        logMinDelayReqInterval -4
        logMinPdelayReqInterval -4
        announceReceiptTimeout 3
        syncReceiptTimeout 0
        delayAsymmetry 0
        fault_reset_interval -4
        neighborPropDelayThresh 20000000
        masterOnly 0
        G.8275.portDS.localPriority 128
        #
        # Run time options
        #
        assume_two_step 0
        logging_level 6
        path_trace_enabled 0
        follow_up_info 0
        hybrid_e2e 0
        inhibit_multicast_service 0
        net_sync_monitor 0
        tc_spanning_tree 0
        tx_timestamp_timeout 50
        unicast_listen 0
        unicast_master_table 0
        unicast_req_duration 3600
        use_syslog 1
        verbose 0
        summary_interval 0
        kernel_leap 1
        check_fup_sync 0
        clock_class_threshold 135
        #
        # Servo Options
        #
        pi_proportional_const 0.0
        pi_integral_const 0.0
        pi_proportional_scale 0.0
        pi_proportional_exponent -0.3
        pi_proportional_norm_max 0.7
        pi_integral_scale 0.0
        pi_integral_exponent 0.4
        pi_integral_norm_max 0.3
        step_threshold 2.0
        first_step_threshold 0.00002
        max_frequency 900000000
        clock_servo pi
        sanity_freq_limit 200000000
        ntpshm_segment 0
        #
        # Transport options
        #
        transportSpecific 0x0
        ptp_dst_mac 01:1B:19:00:00:00
        p2p_dst_mac 01:80:C2:00:00:0E
        udp_ttl 1
        udp6_scope 0x0E
        uds_address /var/run/ptp4l
        #
        # Default interface options
        #
        clock_type BC
        network_transport L2
        delay_mechanism E2E
        time_stamping hardware
        tsproc_mode filter
        delay_filter moving_median
        delay_filter_length 10
        egressLatency 0
        ingressLatency 0
        boundary_clock_jbod 0
        #
        # Clock description
        #
        productDescription ;;
        revisionData ;;
        manufacturerIdentity 00:00:00
        userDescription ;
        timeSource 0xA0
  recommend:
    - profile: boundary-clock
      priority: 4
      match:
        - nodeLabel: "node-role.kubernetes.io/$mcp"

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: boundary-clock
  namespace: openshift-ptp
  annotations: {}
spec:
  profile:
    - name: boundary-clock
      ptp4lOpts: "-2"
      phc2sysOpts: "-a -r -n 24"
      ptpSchedulingPolicy: SCHED_FIFO
      ptpSchedulingPriority: 10
      ptpSettings:
        logReduce: "true"
      ptp4lConf: |
        # The interface name is hardware-specific
        [$iface_slave]
        masterOnly 0
        [$iface_master_1]
        masterOnly 1
        [$iface_master_2]
        masterOnly 1
        [$iface_master_3]
        masterOnly 1
        [global]
        #
        # Default Data Set
        #
        twoStepFlag 1
        slaveOnly 0
        priority1 128
        priority2 128
        domainNumber 24
        #utc_offset 37
        clockClass 248
        clockAccuracy 0xFE
        offsetScaledLogVariance 0xFFFF
        free_running 0
        freq_est_interval 1
        dscp_event 0
        dscp_general 0
        dataset_comparison G.8275.x
        G.8275.defaultDS.localPriority 128
        #
        # Port Data Set
        #
        logAnnounceInterval -3
        logSyncInterval -4
        logMinDelayReqInterval -4
        logMinPdelayReqInterval -4
        announceReceiptTimeout 3
        syncReceiptTimeout 0
        delayAsymmetry 0
        fault_reset_interval -4
        neighborPropDelayThresh 20000000
        masterOnly 0
        G.8275.portDS.localPriority 128
        #
        # Run time options
        #
        assume_two_step 0
        logging_level 6
        path_trace_enabled 0
        follow_up_info 0
        hybrid_e2e 0
        inhibit_multicast_service 0
        net_sync_monitor 0
        tc_spanning_tree 0
        tx_timestamp_timeout 50
        unicast_listen 0
        unicast_master_table 0
        unicast_req_duration 3600
        use_syslog 1
        verbose 0
        summary_interval 0
        kernel_leap 1
        check_fup_sync 0
        clock_class_threshold 135
        #
        # Servo Options
        #
        pi_proportional_const 0.0
        pi_integral_const 0.0
        pi_proportional_scale 0.0
        pi_proportional_exponent -0.3
        pi_proportional_norm_max 0.7
        pi_integral_scale 0.0
        pi_integral_exponent 0.4
        pi_integral_norm_max 0.3
        step_threshold 2.0
        first_step_threshold 0.00002
        max_frequency 900000000
        clock_servo pi
        sanity_freq_limit 200000000
        ntpshm_segment 0
        #
        # Transport options
        #
        transportSpecific 0x0
        ptp_dst_mac 01:1B:19:00:00:00
        p2p_dst_mac 01:80:C2:00:00:0E
        udp_ttl 1
        udp6_scope 0x0E
        uds_address /var/run/ptp4l
        #
        # Default interface options
        #
        clock_type BC
        network_transport L2
        delay_mechanism E2E
        time_stamping hardware
        tsproc_mode filter
        delay_filter moving_median
        delay_filter_length 10
        egressLatency 0
        ingressLatency 0
        boundary_clock_jbod 0
        #
        # Clock description
        #
        productDescription ;;
        revisionData ;;
        manufacturerIdentity 00:00:00
        userDescription ;
        timeSource 0xA0
  recommend:
    - profile: boundary-clock
      priority: 4
      match:
        - nodeLabel: "node-role.kubernetes.io/$mcp"

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Table 17.3. PTP boundary clock CR configuration options
Custom resource field	Description
`name`	The name of the `PtpConfig` CR.
`profile`	Specify an array of one or more `profile` objects.
`name`	Specify the name of a profile object which uniquely identifies a profile object.
`ptp4lOpts`	Specify system config options for the `ptp4l` service. The options should not include the network interface name `-i <interface>` and service config file `-f /etc/ptp4l.conf` because the network interface name and the service config file are automatically appended.
`ptp4lConf`	Specify the required configuration to start `ptp4l` as boundary clock. For example, `ens1f0` synchronizes from a grandmaster clock and `ens1f3` synchronizes connected devices.
`<interface_1>`	The interface that receives the synchronization clock.
`<interface_2>`	The interface that sends the synchronization clock.
`tx_timestamp_timeout`	For Intel Columbiaville 800 Series NICs, set `tx_timestamp_timeout` to `50`.
`boundary_clock_jbod`	For Intel Columbiaville 800 Series NICs, ensure `boundary_clock_jbod` is set to `0`. For Intel Fortville X710 Series NICs, ensure `boundary_clock_jbod` is set to `1`.
`phc2sysOpts`	Specify system config options for the `phc2sys` service. If this field is empty, the PTP Operator does not start the `phc2sys` service.
`ptpSchedulingPolicy`	Scheduling policy for ptp4l and phc2sys processes. Default value is `SCHED_OTHER`. Use `SCHED_FIFO` on systems that support FIFO scheduling.
`ptpSchedulingPriority`	Integer value from 1-65 used to set FIFO priority for `ptp4l` and `phc2sys` processes when `ptpSchedulingPolicy` is set to `SCHED_FIFO`. The `ptpSchedulingPriority` field is not used when `ptpSchedulingPolicy` is set to `SCHED_OTHER`.
`ptpClockThreshold`	Optional. If `ptpClockThreshold` is not present, default values are used for the `ptpClockThreshold` fields. `ptpClockThreshold` configures how long after the PTP master clock is disconnected before PTP events are triggered. `holdOverTimeout` is the time value in seconds before the PTP clock event state changes to `FREERUN` when the PTP master clock is disconnected. The `maxOffsetThreshold` and `minOffsetThreshold` settings configure offset values in nanoseconds that compare against the values for `CLOCK_REALTIME` (`phc2sys`) or master offset (`ptp4l`). When the `ptp4l` or `phc2sys` offset value is outside this range, the PTP clock state is set to `FREERUN`. When the offset value is within this range, the PTP clock state is set to `LOCKED`.
`recommend`	Specify an array of one or more `recommend` objects that define rules on how the `profile` should be applied to nodes.
`.recommend.profile`	Specify the `.recommend.profile` object name defined in the `profile` section.
`.recommend.priority`	Specify the `priority` with an integer value between `0` and `99`. A larger number gets lower priority, so a priority of `99` is lower than a priority of `10`. If a node can be matched with multiple profiles according to rules defined in the `match` field, the profile with the higher priority is applied to that node.
`.recommend.match`	Specify `.recommend.match` rules with `nodeLabel` or `nodeName` values.
`.recommend.match.nodeLabel`	Set `nodeLabel` with the `key` of the `node.Labels` field from the node object by using the `oc get nodes --show-labels` command. For example, `node-role.kubernetes.io/worker`.
`.recommend.match.nodeName`	Set `nodeName` with the value of the `node.Name` field from the node object by using the `oc get nodes` command. For example, `compute-1.example.com`.

Create the CR by running the following command:

oc create -f boundary-clock-ptp-config.yaml

$ oc create -f boundary-clock-ptp-config.yaml

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Verification

Check that the PtpConfig profile is applied to the node.

Get the list of pods in the openshift-ptp namespace by running the following command:

oc get pods -n openshift-ptp -o wide

$ oc get pods -n openshift-ptp -o wide

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Example output

NAME                            READY   STATUS    RESTARTS   AGE   IP               NODE
linuxptp-daemon-4xkbb           1/1     Running   0          43m   10.1.196.24      compute-0.example.com
linuxptp-daemon-tdspf           1/1     Running   0          43m   10.1.196.25      compute-1.example.com
ptp-operator-657bbb64c8-2f8sj   1/1     Running   0          43m   10.129.0.61      control-plane-1.example.com

NAME                            READY   STATUS    RESTARTS   AGE   IP               NODE
linuxptp-daemon-4xkbb           1/1     Running   0          43m   10.1.196.24      compute-0.example.com
linuxptp-daemon-tdspf           1/1     Running   0          43m   10.1.196.25      compute-1.example.com
ptp-operator-657bbb64c8-2f8sj   1/1     Running   0          43m   10.129.0.61      control-plane-1.example.com

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Check that the profile is correct. Examine the logs of the linuxptp daemon that corresponds to the node you specified in the PtpConfig profile. Run the following command:

oc logs linuxptp-daemon-4xkbb -n openshift-ptp -c linuxptp-daemon-container

$ oc logs linuxptp-daemon-4xkbb -n openshift-ptp -c linuxptp-daemon-container

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Example output

I1115 09:41:17.117596 4143292 daemon.go:107] in applyNodePTPProfile
I1115 09:41:17.117604 4143292 daemon.go:109] updating NodePTPProfile to:
I1115 09:41:17.117607 4143292 daemon.go:110] ------------------------------------
I1115 09:41:17.117612 4143292 daemon.go:102] Profile Name: profile1
I1115 09:41:17.117616 4143292 daemon.go:102] Interface:
I1115 09:41:17.117620 4143292 daemon.go:102] Ptp4lOpts: -2
I1115 09:41:17.117623 4143292 daemon.go:102] Phc2sysOpts: -a -r -n 24
I1115 09:41:17.117626 4143292 daemon.go:116] ------------------------------------

I1115 09:41:17.117596 4143292 daemon.go:107] in applyNodePTPProfile
I1115 09:41:17.117604 4143292 daemon.go:109] updating NodePTPProfile to:
I1115 09:41:17.117607 4143292 daemon.go:110] ------------------------------------
I1115 09:41:17.117612 4143292 daemon.go:102] Profile Name: profile1
I1115 09:41:17.117616 4143292 daemon.go:102] Interface:
I1115 09:41:17.117620 4143292 daemon.go:102] Ptp4lOpts: -2
I1115 09:41:17.117623 4143292 daemon.go:102] Phc2sysOpts: -a -r -n 24
I1115 09:41:17.117626 4143292 daemon.go:116] ------------------------------------

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17.6.5. Configuring linuxptp services as boundary clocks for dual NIC hardware

You can configure the linuxptp services (ptp4l, phc2sys) as boundary clocks for dual-NIC hardware by creating a PtpConfig custom resource (CR) object for each NIC.

Dual NIC hardware allows you to connect each NIC to the same upstream leader clock with separate ptp4l instances for each NIC feeding the downstream clocks.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.
Install the PTP Operator.

Procedure

Create two separate PtpConfig CRs, one for each NIC, using the reference CR in "Configuring linuxptp services as a boundary clock" as the basis for each CR. For example:

Create boundary-clock-ptp-config-nic1.yaml, specifying values for phc2sysOpts:

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: boundary-clock-ptp-config-nic1
  namespace: openshift-ptp
spec:
  profile:
  - name: "profile1"
    ptp4lOpts: "-2 --summary_interval -4"
    ptp4lConf: | 
      [ens5f1]
      masterOnly 1
      [ens5f0]
      masterOnly 0
    ...
    phc2sysOpts: "-a -r -m -n 24 -N 8 -R 16"

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: boundary-clock-ptp-config-nic1
  namespace: openshift-ptp
spec:
  profile:
  - name: "profile1"
    ptp4lOpts: "-2 --summary_interval -4"
    ptp4lConf: |

1


      [ens5f1]
      masterOnly 1
      [ens5f0]
      masterOnly 0
    ...
    phc2sysOpts: "-a -r -m -n 24 -N 8 -R 16"

2

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1: Specify the required interfaces to start ptp4l as a boundary clock. For example, ens5f0 synchronizes from a grandmaster clock and ens5f1 synchronizes connected devices.
2: Required phc2sysOpts values. -m prints messages to stdout. The linuxptp-daemon DaemonSet parses the logs and generates Prometheus metrics.

Create boundary-clock-ptp-config-nic2.yaml, removing the phc2sysOpts field altogether to disable the phc2sys service for the second NIC:

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: boundary-clock-ptp-config-nic2
  namespace: openshift-ptp
spec:
  profile:
  - name: "profile2"
    ptp4lOpts: "-2 --summary_interval -4"
    ptp4lConf: | 
      [ens7f1]
      masterOnly 1
      [ens7f0]
      masterOnly 0
...

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: boundary-clock-ptp-config-nic2
  namespace: openshift-ptp
spec:
  profile:
  - name: "profile2"
    ptp4lOpts: "-2 --summary_interval -4"
    ptp4lConf: |

1


      [ens7f1]
      masterOnly 1
      [ens7f0]
      masterOnly 0
...

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1: Specify the required interfaces to start ptp4l as a boundary clock on the second NIC.

Note

You must completely remove the phc2sysOpts field from the second PtpConfig CR to disable the phc2sys service on the second NIC.

Create the dual NIC PtpConfig CRs by running the following commands:
1. Create the CR that configures PTP for the first NIC:
  $ oc create -f boundary-clock-ptp-config-nic1.yaml
  Copy to Clipboard
2. Create the CR that configures PTP for the second NIC:
  $ oc create -f boundary-clock-ptp-config-nic2.yaml
  Copy to Clipboard

Verification

Check that the PTP Operator has applied the PtpConfig CRs for both NICs. Examine the logs for the linuxptp daemon corresponding to the node that has the dual NIC hardware installed. For example, run the following command:

oc logs linuxptp-daemon-cvgr6 -n openshift-ptp -c linuxptp-daemon-container

$ oc logs linuxptp-daemon-cvgr6 -n openshift-ptp -c linuxptp-daemon-container

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Example output

ptp4l[80828.335]: [ptp4l.1.config] master offset          5 s2 freq   -5727 path delay       519
ptp4l[80828.343]: [ptp4l.0.config] master offset         -5 s2 freq  -10607 path delay       533
phc2sys[80828.390]: [ptp4l.0.config] CLOCK_REALTIME phc offset         1 s2 freq  -87239 delay    539

ptp4l[80828.335]: [ptp4l.1.config] master offset          5 s2 freq   -5727 path delay       519
ptp4l[80828.343]: [ptp4l.0.config] master offset         -5 s2 freq  -10607 path delay       533
phc2sys[80828.390]: [ptp4l.0.config] CLOCK_REALTIME phc offset         1 s2 freq  -87239 delay    539

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17.6.6. Intel Columbiaville E800 series NIC as PTP ordinary clock reference

The following table describes the changes that you must make to the reference PTP configuration in order to use Intel Columbiaville E800 series NICs as ordinary clocks. Make the changes in a PtpConfig custom resource (CR) that you apply to the cluster.

Table 17.4. Recommended PTP settings for Intel Columbiaville NIC
PTP configuration	Recommended setting
`phc2sysOpts`	`-a -r -m -n 24 -N 8 -R 16`
`tx_timestamp_timeout`	`50`
`boundary_clock_jbod`	`0`

Note

For phc2sysOpts, -m prints messages to stdout. The linuxptp-daemon DaemonSet parses the logs and generates Prometheus metrics.

17.6.7. Configuring FIFO priority scheduling for PTP hardware

In telco or other deployment configurations that require low latency performance, PTP daemon threads run in a constrained CPU footprint alongside the rest of the infrastructure components. By default, PTP threads run with the SCHED_OTHER policy. Under high load, these threads might not get the scheduling latency they require for error-free operation.

To mitigate against potential scheduling latency errors, you can configure the PTP Operator linuxptp services to allow threads to run with a SCHED_FIFO policy. If SCHED_FIFO is set for a PtpConfig CR, then ptp4l and phc2sys will run in the parent container under chrt with a priority set by the ptpSchedulingPriority field of the PtpConfig CR.

Note

Setting ptpSchedulingPolicy is optional, and is only required if you are experiencing latency errors.

Procedure

Edit the PtpConfig CR profile:

oc edit PtpConfig -n openshift-ptp

$ oc edit PtpConfig -n openshift-ptp

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Change the ptpSchedulingPolicy and ptpSchedulingPriority fields:

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: <ptp_config_name>
  namespace: openshift-ptp
...
spec:
  profile:
  - name: "profile1"
...
    ptpSchedulingPolicy: SCHED_FIFO 
    ptpSchedulingPriority: 10

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: <ptp_config_name>
  namespace: openshift-ptp
...
spec:
  profile:
  - name: "profile1"
...
    ptpSchedulingPolicy: SCHED_FIFO

1


    ptpSchedulingPriority: 10

2

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1: Scheduling policy for ptp4l and phc2sys processes. Use SCHED_FIFO on systems that support FIFO scheduling.
2: Required. Sets the integer value 1-65 used to configure FIFO priority for ptp4l and phc2sys processes.

Save and exit to apply the changes to the PtpConfig CR.

Verification

Get the name of the linuxptp-daemon pod and corresponding node where the PtpConfig CR has been applied:

oc get pods -n openshift-ptp -o wide

$ oc get pods -n openshift-ptp -o wide

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Example output

NAME                            READY   STATUS    RESTARTS   AGE     IP            NODE
linuxptp-daemon-gmv2n           3/3     Running   0          1d17h   10.1.196.24   compute-0.example.com
linuxptp-daemon-lgm55           3/3     Running   0          1d17h   10.1.196.25   compute-1.example.com
ptp-operator-3r4dcvf7f4-zndk7   1/1     Running   0          1d7h    10.129.0.61   control-plane-1.example.com

NAME                            READY   STATUS    RESTARTS   AGE     IP            NODE
linuxptp-daemon-gmv2n           3/3     Running   0          1d17h   10.1.196.24   compute-0.example.com
linuxptp-daemon-lgm55           3/3     Running   0          1d17h   10.1.196.25   compute-1.example.com
ptp-operator-3r4dcvf7f4-zndk7   1/1     Running   0          1d7h    10.129.0.61   control-plane-1.example.com

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Check that the ptp4l process is running with the updated chrt FIFO priority:

oc -n openshift-ptp logs linuxptp-daemon-lgm55 -c linuxptp-daemon-container|grep chrt

$ oc -n openshift-ptp logs linuxptp-daemon-lgm55 -c linuxptp-daemon-container|grep chrt

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Example output

I1216 19:24:57.091872 1600715 daemon.go:285] /bin/chrt -f 65 /usr/sbin/ptp4l -f /var/run/ptp4l.0.config -2  --summary_interval -4 -m

I1216 19:24:57.091872 1600715 daemon.go:285] /bin/chrt -f 65 /usr/sbin/ptp4l -f /var/run/ptp4l.0.config -2  --summary_interval -4 -m

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17.6.8. Configuring log filtering for linuxptp services

The linuxptp daemon generates logs that you can use for debugging purposes. In telco or other deployment configurations that feature a limited storage capacity, these logs can add to the storage demand.

To reduce the number log messages, you can configure the PtpConfig custom resource (CR) to exclude log messages that report the master offset value. The master offset log message reports the difference between the current node’s clock and the master clock in nanoseconds.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.
Install the PTP Operator.

Procedure

Edit the PtpConfig CR:

oc edit PtpConfig -n openshift-ptp

$ oc edit PtpConfig -n openshift-ptp

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In spec.profile, add the ptpSettings.logReduce specification and set the value to true:

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: <ptp_config_name>
  namespace: openshift-ptp
...
spec:
  profile:
  - name: "profile1"
...
    ptpSettings:
      logReduce: "true"

apiVersion: ptp.openshift.io/v1
kind: PtpConfig
metadata:
  name: <ptp_config_name>
  namespace: openshift-ptp
...
spec:
  profile:
  - name: "profile1"
...
    ptpSettings:
      logReduce: "true"

Copy to Clipboard

Note

For debugging purposes, you can revert this specification to False to include the master offset messages.

Save and exit to apply the changes to the PtpConfig CR.

Verification

Get the name of the linuxptp-daemon pod and corresponding node where the PtpConfig CR has been applied:

oc get pods -n openshift-ptp -o wide

$ oc get pods -n openshift-ptp -o wide

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Example output

NAME                            READY   STATUS    RESTARTS   AGE     IP            NODE
linuxptp-daemon-gmv2n           3/3     Running   0          1d17h   10.1.196.24   compute-0.example.com
linuxptp-daemon-lgm55           3/3     Running   0          1d17h   10.1.196.25   compute-1.example.com
ptp-operator-3r4dcvf7f4-zndk7   1/1     Running   0          1d7h    10.129.0.61   control-plane-1.example.com

NAME                            READY   STATUS    RESTARTS   AGE     IP            NODE
linuxptp-daemon-gmv2n           3/3     Running   0          1d17h   10.1.196.24   compute-0.example.com
linuxptp-daemon-lgm55           3/3     Running   0          1d17h   10.1.196.25   compute-1.example.com
ptp-operator-3r4dcvf7f4-zndk7   1/1     Running   0          1d7h    10.129.0.61   control-plane-1.example.com

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Verify that master offset messages are excluded from the logs by running the following command:
```
oc -n openshift-ptp logs <linux_daemon_container> -c linuxptp-daemon-container | grep "master offset"
```
```
$ oc -n openshift-ptp logs <linux_daemon_container> -c linuxptp-daemon-container | grep "master offset" 
```
1
Copy to Clipboard
1
<linux_daemon_container> is the name of the linuxptp-daemon pod, for example linuxptp-daemon-gmv2n.
When you configure the logReduce specification, this command does not report any instances of master offset in the logs of the linuxptp daemon.

17.7. Troubleshooting common PTP Operator issues

Troubleshoot common problems with the PTP Operator by performing the following steps.

Prerequisites

Install the OpenShift Container Platform CLI (oc).
Log in as a user with cluster-admin privileges.
Install the PTP Operator on a bare-metal cluster with hosts that support PTP.

Procedure

Check the Operator and operands are successfully deployed in the cluster for the configured nodes.

oc get pods -n openshift-ptp -o wide

$ oc get pods -n openshift-ptp -o wide

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Example output

NAME                            READY   STATUS    RESTARTS   AGE     IP            NODE
linuxptp-daemon-lmvgn           3/3     Running   0          4d17h   10.1.196.24   compute-0.example.com
linuxptp-daemon-qhfg7           3/3     Running   0          4d17h   10.1.196.25   compute-1.example.com
ptp-operator-6b8dcbf7f4-zndk7   1/1     Running   0          5d7h    10.129.0.61   control-plane-1.example.com

NAME                            READY   STATUS    RESTARTS   AGE     IP            NODE
linuxptp-daemon-lmvgn           3/3     Running   0          4d17h   10.1.196.24   compute-0.example.com
linuxptp-daemon-qhfg7           3/3     Running   0          4d17h   10.1.196.25   compute-1.example.com
ptp-operator-6b8dcbf7f4-zndk7   1/1     Running   0          5d7h    10.129.0.61   control-plane-1.example.com

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Note

When the PTP fast event bus is enabled, the number of ready linuxptp-daemon pods is 3/3. If the PTP fast event bus is not enabled, 2/2 is displayed.

Check that supported hardware is found in the cluster.

oc -n openshift-ptp get nodeptpdevices.ptp.openshift.io

$ oc -n openshift-ptp get nodeptpdevices.ptp.openshift.io

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Example output

NAME                                  AGE
control-plane-0.example.com           10d
control-plane-1.example.com           10d
compute-0.example.com                 10d
compute-1.example.com                 10d
compute-2.example.com                 10d

NAME                                  AGE
control-plane-0.example.com           10d
control-plane-1.example.com           10d
compute-0.example.com                 10d
compute-1.example.com                 10d
compute-2.example.com                 10d

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Check the available PTP network interfaces for a node:

oc -n openshift-ptp get nodeptpdevices.ptp.openshift.io <node_name> -o yaml

$ oc -n openshift-ptp get nodeptpdevices.ptp.openshift.io <node_name> -o yaml

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where:

<node_name>

Specifies the node you want to query, for example, compute-0.example.com.

Example output

apiVersion: ptp.openshift.io/v1
kind: NodePtpDevice
metadata:
  creationTimestamp: "2021-09-14T16:52:33Z"
  generation: 1
  name: compute-0.example.com
  namespace: openshift-ptp
  resourceVersion: "177400"
  uid: 30413db0-4d8d-46da-9bef-737bacd548fd
spec: {}
status:
  devices:
  - name: eno1
  - name: eno2
  - name: eno3
  - name: eno4
  - name: enp5s0f0
  - name: enp5s0f1

apiVersion: ptp.openshift.io/v1
kind: NodePtpDevice
metadata:
  creationTimestamp: "2021-09-14T16:52:33Z"
  generation: 1
  name: compute-0.example.com
  namespace: openshift-ptp
  resourceVersion: "177400"
  uid: 30413db0-4d8d-46da-9bef-737bacd548fd
spec: {}
status:
  devices:
  - name: eno1
  - name: eno2
  - name: eno3
  - name: eno4
  - name: enp5s0f0
  - name: enp5s0f1

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Check that the PTP interface is successfully synchronized to the primary clock by accessing the linuxptp-daemon pod for the corresponding node.

Get the name of the linuxptp-daemon pod and corresponding node you want to troubleshoot by running the following command:

oc get pods -n openshift-ptp -o wide

$ oc get pods -n openshift-ptp -o wide

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Example output

NAME                            READY   STATUS    RESTARTS   AGE     IP            NODE
linuxptp-daemon-lmvgn           3/3     Running   0          4d17h   10.1.196.24   compute-0.example.com
linuxptp-daemon-qhfg7           3/3     Running   0          4d17h   10.1.196.25   compute-1.example.com
ptp-operator-6b8dcbf7f4-zndk7   1/1     Running   0          5d7h    10.129.0.61   control-plane-1.example.com

NAME                            READY   STATUS    RESTARTS   AGE     IP            NODE
linuxptp-daemon-lmvgn           3/3     Running   0          4d17h   10.1.196.24   compute-0.example.com
linuxptp-daemon-qhfg7           3/3     Running   0          4d17h   10.1.196.25   compute-1.example.com
ptp-operator-6b8dcbf7f4-zndk7   1/1     Running   0          5d7h    10.129.0.61   control-plane-1.example.com

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Remote shell into the required linuxptp-daemon container:
```
oc rsh -n openshift-ptp -c linuxptp-daemon-container <linux_daemon_container>
```
```
$ oc rsh -n openshift-ptp -c linuxptp-daemon-container <linux_daemon_container>
```
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where:
<linux_daemon_container>
is the container you want to diagnose, for example linuxptp-daemon-lmvgn.

In the remote shell connection to the linuxptp-daemon container, use the PTP Management Client (pmc) tool to diagnose the network interface. Run the following pmc command to check the sync status of the PTP device, for example ptp4l.

pmc -u -f /var/run/ptp4l.0.config -b 0 'GET PORT_DATA_SET'

# pmc -u -f /var/run/ptp4l.0.config -b 0 'GET PORT_DATA_SET'

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Example output when the node is successfully synced to the primary clock

sending: GET PORT_DATA_SET
    40a6b7.fffe.166ef0-1 seq 0 RESPONSE MANAGEMENT PORT_DATA_SET
        portIdentity            40a6b7.fffe.166ef0-1
        portState               SLAVE
        logMinDelayReqInterval  -4
        peerMeanPathDelay       0
        logAnnounceInterval     -3
        announceReceiptTimeout  3
        logSyncInterval         -4
        delayMechanism          1
        logMinPdelayReqInterval -4
        versionNumber           2

sending: GET PORT_DATA_SET
    40a6b7.fffe.166ef0-1 seq 0 RESPONSE MANAGEMENT PORT_DATA_SET
        portIdentity            40a6b7.fffe.166ef0-1
        portState               SLAVE
        logMinDelayReqInterval  -4
        peerMeanPathDelay       0
        logAnnounceInterval     -3
        announceReceiptTimeout  3
        logSyncInterval         -4
        delayMechanism          1
        logMinPdelayReqInterval -4
        versionNumber           2

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17.7.1. Collecting Precision Time Protocol (PTP) Operator data

You can use the oc adm must-gather CLI command to collect information about your cluster, including features and objects associated with Precision Time Protocol (PTP) Operator.

Prerequisites

You have access to the cluster as a user with the cluster-admin role.
You have installed the OpenShift CLI (oc).
You have installed the PTP Operator.

Procedure

To collect PTP Operator data with must-gather, you must specify the PTP Operator must-gather image.

oc adm must-gather --image=registry.redhat.io/openshift4/ptp-must-gather-rhel8:v4.13

$ oc adm must-gather --image=registry.redhat.io/openshift4/ptp-must-gather-rhel8:v4.13

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17.8. PTP hardware fast event notifications framework

Cloud native applications such as virtual RAN (vRAN) require access to notifications about hardware timing events that are critical to the functioning of the overall network. PTP clock synchronization errors can negatively affect the performance and reliability of your low-latency application, for example, a vRAN application running in a distributed unit (DU).

17.8.1. About PTP and clock synchronization error events

Loss of PTP synchronization is a critical error for a RAN network. If synchronization is lost on a node, the radio might be shut down and the network Over the Air (OTA) traffic might be shifted to another node in the wireless network. Fast event notifications mitigate against workload errors by allowing cluster nodes to communicate PTP clock sync status to the vRAN application running in the DU.

Event notifications are available to vRAN applications running on the same DU node. A publish-subscribe REST API passes events notifications to the messaging bus. Publish-subscribe messaging, or pub-sub messaging, is an asynchronous service-to-service communication architecture where any message published to a topic is immediately received by all of the subscribers to the topic.

The PTP Operator generates fast event notifications for every PTP-capable network interface. You can access the events by using a cloud-event-proxy sidecar container over an HTTP or Advanced Message Queuing Protocol (AMQP) message bus.

Note

PTP fast event notifications are available for network interfaces configured to use PTP ordinary clocks or PTP boundary clocks.

Note

HTTP transport is the default transport for PTP and bare-metal events. Use HTTP transport instead of AMQP for PTP and bare-metal events where possible. AMQ Interconnect is EOL from 30 June 2024. Extended life cycle support (ELS) for AMQ Interconnect ends 29 November 2029. For more information see, Red Hat AMQ Interconnect support status.

17.8.2. About the PTP fast event notifications framework

Use the Precision Time Protocol (PTP) fast event notifications framework to subscribe cluster applications to PTP events that the bare-metal cluster node generates.

Note

The fast events notifications framework uses a REST API for communication. The REST API is based on the O-RAN O-Cloud Notification API Specification for Event Consumers 3.0 that is available from O-RAN ALLIANCE Specifications.

The framework consists of a publisher, subscriber, and an AMQ or HTTP messaging protocol to handle communications between the publisher and subscriber applications. Applications run the cloud-event-proxy container in a sidecar pattern to subscribe to PTP events. The cloud-event-proxy sidecar container can access the same resources as the primary application container without using any of the resources of the primary application and with no significant latency.

Note

HTTP transport is the default transport for PTP and bare-metal events. Use HTTP transport instead of AMQP for PTP and bare-metal events where possible. AMQ Interconnect is EOL from 30 June 2024. Extended life cycle support (ELS) for AMQ Interconnect ends 29 November 2029. For more information see, Red Hat AMQ Interconnect support status.

Figure 17.1. Overview of PTP fast events

Event is generated on the cluster host: linuxptp-daemon in the PTP Operator-managed pod runs as a Kubernetes DaemonSet and manages the various linuxptp processes (ptp4l, phc2sys, and optionally for grandmaster clocks, ts2phc). The linuxptp-daemon passes the event to the UNIX domain socket.
Event is passed to the cloud-event-proxy sidecar: The PTP plugin reads the event from the UNIX domain socket and passes it to the cloud-event-proxy sidecar in the PTP Operator-managed pod. cloud-event-proxy delivers the event from the Kubernetes infrastructure to Cloud-Native Network Functions (CNFs) with low latency.
Event is persisted: The cloud-event-proxy sidecar in the PTP Operator-managed pod processes the event and publishes the cloud-native event by using a REST API.
Message is transported: The message transporter transports the event to the cloud-event-proxy sidecar in the application pod over HTTP or AMQP 1.0 QPID.
Event is available from the REST API: The cloud-event-proxy sidecar in the Application pod processes the event and makes it available by using the REST API.
Consumer application requests a subscription and receives the subscribed event: The consumer application sends an API request to the cloud-event-proxy sidecar in the application pod to create a PTP events subscription. The cloud-event-proxy sidecar creates an AMQ or HTTP messaging listener protocol for the resource specified in the subscription.

The cloud-event-proxy sidecar in the application pod receives the event from the PTP Operator-managed pod, unwraps the cloud events object to retrieve the data, and posts the event to the consumer application. The consumer application listens to the address specified in the resource qualifier and receives and processes the PTP event.

17.8.3. Configuring the PTP fast event notifications publisher

To start using PTP fast event notifications for a network interface in your cluster, you must enable the fast event publisher in the PTP Operator PtpOperatorConfig custom resource (CR) and configure ptpClockThreshold values in a PtpConfig CR that you create.

Prerequisites

You have installed the OpenShift Container Platform CLI (oc).
You have logged in as a user with cluster-admin privileges.
You have installed the PTP Operator.

Procedure

Modify the default PTP Operator config to enable PTP fast events.

Save the following YAML in the ptp-operatorconfig.yaml file:

apiVersion: ptp.openshift.io/v1
kind: PtpOperatorConfig
metadata:
  name: default
  namespace: openshift-ptp
spec:
  daemonNodeSelector:
    node-role.kubernetes.io/worker: ""
  ptpEventConfig:
    enableEventPublisher: true

apiVersion: ptp.openshift.io/v1
kind: PtpOperatorConfig
metadata:
  name: default
  namespace: openshift-ptp
spec:
  daemonNodeSelector:
    node-role.kubernetes.io/worker: ""
  ptpEventConfig:
    enableEventPublisher: true

1

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1: Set enableEventPublisher to true to enable PTP fast event notifications.

Note

In OpenShift Container Platform 4.13 or later, you do not need to set the spec.ptpEventConfig.transportHost field in the PtpOperatorConfig resource when you use HTTP transport for PTP events. Set transportHost only when you use AMQP transport for PTP events.

Update the PtpOperatorConfig CR:

oc apply -f ptp-operatorconfig.yaml

$ oc apply -f ptp-operatorconfig.yaml

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Create a PtpConfig custom resource (CR) for the PTP enabled interface, and set the required values for ptpClockThreshold and ptp4lOpts. The following YAML illustrates the required values that you must set in the PtpConfig CR:
```
spec:
  profile:
  - name: "profile1"
    interface: "enp5s0f0"
    ptp4lOpts: "-2 -s --summary_interval -4" 
    phc2sysOpts: "-a -r -m -n 24 -N 8 -R 16" 
    ptp4lConf: "" 
    ptpClockThreshold: 
      holdOverTimeout: 5
      maxOffsetThreshold: 100
      minOffsetThreshold: -100
```
```
spec:
  profile:
  - name: "profile1"
    interface: "enp5s0f0"
    ptp4lOpts: "-2 -s --summary_interval -4" 
```
1
```
    phc2sysOpts: "-a -r -m -n 24 -N 8 -R 16" 
```
2
```
    ptp4lConf: "" 
```
3
```
    ptpClockThreshold: 
```
4
```
      holdOverTimeout: 5
      maxOffsetThreshold: 100
      minOffsetThreshold: -100
```
Copy to Clipboard
1
Append --summary_interval -4 to use PTP fast events.
2
Required phc2sysOpts values. -m prints messages to stdout. The linuxptp-daemon DaemonSet parses the logs and generates Prometheus metrics.
3
Specify a string that contains the configuration to replace the default /etc/ptp4l.conf file. To use the default configuration, leave the field empty.
4
Optional. If the ptpClockThreshold stanza is not present, default values are used for the ptpClockThreshold fields. The stanza shows default ptpClockThreshold values. The ptpClockThreshold values configure how long after the PTP master clock is disconnected before PTP events are triggered. holdOverTimeout is the time value in seconds before the PTP clock event state changes to FREERUN when the PTP master clock is disconnected. The maxOffsetThreshold and minOffsetThreshold settings configure offset values in nanoseconds that compare against the values for CLOCK_REALTIME (phc2sys) or master offset (ptp4l). When the ptp4l or phc2sys offset value is outside this range, the PTP clock state is set to FREERUN. When the offset value is within this range, the PTP clock state is set to LOCKED.

17.8.4. Migrating consumer applications to use HTTP transport for PTP or bare-metal events

If you have previously deployed PTP or bare-metal events consumer applications, you need to update the applications to use HTTP message transport.

Prerequisites

You have installed the OpenShift CLI (oc).
You have logged in as a user with cluster-admin privileges.
You have updated the PTP Operator or Bare Metal Event Relay to version 4.13+ which uses HTTP transport by default.

Procedure

Update your events consumer application to use HTTP transport. Set the http-event-publishers variable for the cloud event sidecar deployment.

For example, in a cluster with PTP events configured, the following YAML snippet illustrates a cloud event sidecar deployment:

containers:
  - name: cloud-event-sidecar
    image: cloud-event-sidecar
    args:
      - "--metrics-addr=127.0.0.1:9091"
      - "--store-path=/store"
      - "--transport-host=consumer-events-subscription-service.cloud-events.svc.cluster.local:9043"
      - "--http-event-publishers=ptp-event-publisher-service-NODE_NAME.openshift-ptp.svc.cluster.local:9043" 
      - "--api-port=8089"

containers:
  - name: cloud-event-sidecar
    image: cloud-event-sidecar
    args:
      - "--metrics-addr=127.0.0.1:9091"
      - "--store-path=/store"
      - "--transport-host=consumer-events-subscription-service.cloud-events.svc.cluster.local:9043"
      - "--http-event-publishers=ptp-event-publisher-service-NODE_NAME.openshift-ptp.svc.cluster.local:9043"

1


      - "--api-port=8089"

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1: The PTP Operator automatically resolves NODE_NAME to the host that is generating the PTP events. For example, compute-1.example.com.

In a cluster with bare-metal events configured, set the http-event-publishers field to hw-event-publisher-service.openshift-bare-metal-events.svc.cluster.local:9043 in the cloud event sidecar deployment CR.

Deploy the consumer-events-subscription-service service alongside the events consumer application. For example:

apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: "true"
    service.alpha.openshift.io/serving-cert-secret-name: sidecar-consumer-secret
  name: consumer-events-subscription-service
  namespace: cloud-events
  labels:
    app: consumer-service
spec:
  ports:
    - name: sub-port
      port: 9043
  selector:
    app: consumer
  clusterIP: None
  sessionAffinity: None
  type: ClusterIP

apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: "true"
    service.alpha.openshift.io/serving-cert-secret-name: sidecar-consumer-secret
  name: consumer-events-subscription-service
  namespace: cloud-events
  labels:
    app: consumer-service
spec:
  ports:
    - name: sub-port
      port: 9043
  selector:
    app: consumer
  clusterIP: None
  sessionAffinity: None
  type: ClusterIP

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17.8.5. Installing the AMQ messaging bus

To pass PTP fast event notifications between publisher and subscriber on a node, you can install and configure an AMQ messaging bus to run locally on the node. To use AMQ messaging, you must install the AMQ Interconnect Operator.

Note

HTTP transport is the default transport for PTP and bare-metal events. Use HTTP transport instead of AMQP for PTP and bare-metal events where possible. AMQ Interconnect is EOL from 30 June 2024. Extended life cycle support (ELS) for AMQ Interconnect ends 29 November 2029. For more information see, Red Hat AMQ Interconnect support status.

Prerequisites

Install the OpenShift Container Platform CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Install the AMQ Interconnect Operator to its own amq-interconnect namespace. See Adding the Red Hat Integration - AMQ Interconnect Operator.

Verification

Check that the AMQ Interconnect Operator is available and the required pods are running:

oc get pods -n amq-interconnect

$ oc get pods -n amq-interconnect

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Example output

NAME                                    READY   STATUS    RESTARTS   AGE
amq-interconnect-645db76c76-k8ghs       1/1     Running   0          23h
interconnect-operator-5cb5fc7cc-4v7qm   1/1     Running   0          23h

NAME                                    READY   STATUS    RESTARTS   AGE
amq-interconnect-645db76c76-k8ghs       1/1     Running   0          23h
interconnect-operator-5cb5fc7cc-4v7qm   1/1     Running   0          23h

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Check that the required linuxptp-daemon PTP event producer pods are running in the openshift-ptp namespace.

oc get pods -n openshift-ptp

$ oc get pods -n openshift-ptp

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Example output

NAME                     READY   STATUS    RESTARTS       AGE
linuxptp-daemon-2t78p    3/3     Running   0              12h
linuxptp-daemon-k8n88    3/3     Running   0              12h

NAME                     READY   STATUS    RESTARTS       AGE
linuxptp-daemon-2t78p    3/3     Running   0              12h
linuxptp-daemon-k8n88    3/3     Running   0              12h

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17.8.6. Subscribing DU applications to PTP events REST API reference

Use the PTP event notifications REST API to subscribe a distributed unit (DU) application to the PTP events that are generated on the parent node.

Subscribe applications to PTP events by using the resource address /cluster/node/<node_name>/ptp, where <node_name> is the cluster node running the DU application.

Deploy your cloud-event-consumer DU application container and cloud-event-proxy sidecar container in a separate DU application pod. The cloud-event-consumer DU application subscribes to the cloud-event-proxy container in the application pod.

Use the following API endpoints to subscribe the cloud-event-consumer DU application to PTP events posted by the cloud-event-proxy container at http://localhost:8089/api/ocloudNotifications/v1/ in the DU application pod:

/api/ocloudNotifications/v1/subscriptions
- POST: Creates a new subscription
- GET: Retrieves a list of subscriptions
- DELETE: Deletes all subscriptions
/api/ocloudNotifications/v1/subscriptions/<subscription_id>
- GET: Returns details for the specified subscription ID
- DELETE: Deletes the subscription associated with the specified subscription ID
/api/ocloudNotifications/v1/health
- GET: Returns the health status of ocloudNotifications API
api/ocloudNotifications/v1/publishers
- GET: Returns an array of os-clock-sync-state, ptp-clock-class-change, and lock-state messages for the cluster node
/api/ocloudnotifications/v1/{resource_address}/CurrentState
- GET: Returns the current state of one the following event types: os-clock-sync-state, ptp-clock-class-change, or lock-state events

Note

9089 is the default port for the cloud-event-consumer container deployed in the application pod. You can configure a different port for your DU application as required.

17.8.6.1. api/ocloudNotifications/v1/subscriptions

HTTP method

GET api/ocloudNotifications/v1/subscriptions

Description

Returns a list of subscriptions. If subscriptions exist, a 200 OK status code is returned along with the list of subscriptions.

Example API response

[
 {
  "id": "75b1ad8f-c807-4c23-acf5-56f4b7ee3826",
  "endpointUri": "http://localhost:9089/event",
  "uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/75b1ad8f-c807-4c23-acf5-56f4b7ee3826",
  "resource": "/cluster/node/compute-1.example.com/ptp"
 }
]

[
 {
  "id": "75b1ad8f-c807-4c23-acf5-56f4b7ee3826",
  "endpointUri": "http://localhost:9089/event",
  "uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/75b1ad8f-c807-4c23-acf5-56f4b7ee3826",
  "resource": "/cluster/node/compute-1.example.com/ptp"
 }
]

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HTTP method

POST api/ocloudNotifications/v1/subscriptions

Description

Creates a new subscription. If a subscription is successfully created, or if it already exists, a 201 Created status code is returned.

Table 17.5. Query parameters
Parameter	Type
subscription	data

Example payload

{
  "uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions",
  "resource": "/cluster/node/compute-1.example.com/ptp"
}

{
  "uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions",
  "resource": "/cluster/node/compute-1.example.com/ptp"
}

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HTTP method

DELETE api/ocloudNotifications/v1/subscriptions

Description

Deletes all subscriptions.

Example API response

{
"status": "deleted all subscriptions"
}

{
"status": "deleted all subscriptions"
}

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17.8.6.2. api/ocloudNotifications/v1/subscriptions/{subscription_id}

HTTP method

GET api/ocloudNotifications/v1/subscriptions/{subscription_id}

Description

Returns details for the subscription with ID subscription_id.

Table 17.6. Global path parameters
Parameter	Type
`subscription_id`	string

Example API response

{
  "id":"48210fb3-45be-4ce0-aa9b-41a0e58730ab",
  "endpointUri": "http://localhost:9089/event",
  "uriLocation":"http://localhost:8089/api/ocloudNotifications/v1/subscriptions/48210fb3-45be-4ce0-aa9b-41a0e58730ab",
  "resource":"/cluster/node/compute-1.example.com/ptp"
}

{
  "id":"48210fb3-45be-4ce0-aa9b-41a0e58730ab",
  "endpointUri": "http://localhost:9089/event",
  "uriLocation":"http://localhost:8089/api/ocloudNotifications/v1/subscriptions/48210fb3-45be-4ce0-aa9b-41a0e58730ab",
  "resource":"/cluster/node/compute-1.example.com/ptp"
}

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HTTP method

DELETE api/ocloudNotifications/v1/subscriptions/{subscription_id}

Description

Deletes the subscription with ID subscription_id.

Table 17.7. Global path parameters
Parameter	Type
`subscription_id`	string

Example API response

{
"status": "OK"
}

{
"status": "OK"
}

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17.8.6.3. api/ocloudNotifications/v1/health

HTTP method

GET api/ocloudNotifications/v1/health/

Description

Returns the health status for the ocloudNotifications REST API.

Example API response

OK

OK

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17.8.6.4. api/ocloudNotifications/v1/publishers

HTTP method

GET api/ocloudNotifications/v1/publishers

Description

Returns an array of os-clock-sync-state, ptp-clock-class-change, and lock-state details for the cluster node. The system generates notifications when the relevant equipment state changes.

os-clock-sync-state notifications describe the host operating system clock synchronization state. Can be in LOCKED or FREERUN state.
ptp-clock-class-change notifications describe the current state of the PTP clock class.
lock-state notifications describe the current status of the PTP equipment lock state. Can be in LOCKED, HOLDOVER or FREERUN state.

Example API response

[
  {
    "id": "0fa415ae-a3cf-4299-876a-589438bacf75",
    "endpointUri": "http://localhost:9085/api/ocloudNotifications/v1/dummy",
    "uriLocation": "http://localhost:9085/api/ocloudNotifications/v1/publishers/0fa415ae-a3cf-4299-876a-589438bacf75",
    "resource": "/cluster/node/compute-1.example.com/sync/sync-status/os-clock-sync-state"
  },
  {
    "id": "28cd82df-8436-4f50-bbd9-7a9742828a71",
    "endpointUri": "http://localhost:9085/api/ocloudNotifications/v1/dummy",
    "uriLocation": "http://localhost:9085/api/ocloudNotifications/v1/publishers/28cd82df-8436-4f50-bbd9-7a9742828a71",
    "resource": "/cluster/node/compute-1.example.com/sync/ptp-status/ptp-clock-class-change"
  },
  {
    "id": "44aa480d-7347-48b0-a5b0-e0af01fa9677",
    "endpointUri": "http://localhost:9085/api/ocloudNotifications/v1/dummy",
    "uriLocation": "http://localhost:9085/api/ocloudNotifications/v1/publishers/44aa480d-7347-48b0-a5b0-e0af01fa9677",
    "resource": "/cluster/node/compute-1.example.com/sync/ptp-status/lock-state"
  }
]

[
  {
    "id": "0fa415ae-a3cf-4299-876a-589438bacf75",
    "endpointUri": "http://localhost:9085/api/ocloudNotifications/v1/dummy",
    "uriLocation": "http://localhost:9085/api/ocloudNotifications/v1/publishers/0fa415ae-a3cf-4299-876a-589438bacf75",
    "resource": "/cluster/node/compute-1.example.com/sync/sync-status/os-clock-sync-state"
  },
  {
    "id": "28cd82df-8436-4f50-bbd9-7a9742828a71",
    "endpointUri": "http://localhost:9085/api/ocloudNotifications/v1/dummy",
    "uriLocation": "http://localhost:9085/api/ocloudNotifications/v1/publishers/28cd82df-8436-4f50-bbd9-7a9742828a71",
    "resource": "/cluster/node/compute-1.example.com/sync/ptp-status/ptp-clock-class-change"
  },
  {
    "id": "44aa480d-7347-48b0-a5b0-e0af01fa9677",
    "endpointUri": "http://localhost:9085/api/ocloudNotifications/v1/dummy",
    "uriLocation": "http://localhost:9085/api/ocloudNotifications/v1/publishers/44aa480d-7347-48b0-a5b0-e0af01fa9677",
    "resource": "/cluster/node/compute-1.example.com/sync/ptp-status/lock-state"
  }
]

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You can find os-clock-sync-state, ptp-clock-class-change and lock-state events in the logs for the cloud-event-proxy container. For example:

oc logs -f linuxptp-daemon-cvgr6 -n openshift-ptp -c cloud-event-proxy

$ oc logs -f linuxptp-daemon-cvgr6 -n openshift-ptp -c cloud-event-proxy

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Example os-clock-sync-state event

{
   "id":"c8a784d1-5f4a-4c16-9a81-a3b4313affe5",
   "type":"event.sync.sync-status.os-clock-sync-state-change",
   "source":"/cluster/compute-1.example.com/ptp/CLOCK_REALTIME",
   "dataContentType":"application/json",
   "time":"2022-05-06T15:31:23.906277159Z",
   "data":{
      "version":"v1",
      "values":[
         {
            "resource":"/sync/sync-status/os-clock-sync-state",
            "dataType":"notification",
            "valueType":"enumeration",
            "value":"LOCKED"
         },
         {
            "resource":"/sync/sync-status/os-clock-sync-state",
            "dataType":"metric",
            "valueType":"decimal64.3",
            "value":"-53"
         }
      ]
   }
}

{
   "id":"c8a784d1-5f4a-4c16-9a81-a3b4313affe5",
   "type":"event.sync.sync-status.os-clock-sync-state-change",
   "source":"/cluster/compute-1.example.com/ptp/CLOCK_REALTIME",
   "dataContentType":"application/json",
   "time":"2022-05-06T15:31:23.906277159Z",
   "data":{
      "version":"v1",
      "values":[
         {
            "resource":"/sync/sync-status/os-clock-sync-state",
            "dataType":"notification",
            "valueType":"enumeration",
            "value":"LOCKED"
         },
         {
            "resource":"/sync/sync-status/os-clock-sync-state",
            "dataType":"metric",
            "valueType":"decimal64.3",
            "value":"-53"
         }
      ]
   }
}

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Example ptp-clock-class-change event

{
   "id":"69eddb52-1650-4e56-b325-86d44688d02b",
   "type":"event.sync.ptp-status.ptp-clock-class-change",
   "source":"/cluster/compute-1.example.com/ptp/ens2fx/master",
   "dataContentType":"application/json",
   "time":"2022-05-06T15:31:23.147100033Z",
   "data":{
      "version":"v1",
      "values":[
         {
            "resource":"/sync/ptp-status/ptp-clock-class-change",
            "dataType":"metric",
            "valueType":"decimal64.3",
            "value":"135"
         }
      ]
   }
}

{
   "id":"69eddb52-1650-4e56-b325-86d44688d02b",
   "type":"event.sync.ptp-status.ptp-clock-class-change",
   "source":"/cluster/compute-1.example.com/ptp/ens2fx/master",
   "dataContentType":"application/json",
   "time":"2022-05-06T15:31:23.147100033Z",
   "data":{
      "version":"v1",
      "values":[
         {
            "resource":"/sync/ptp-status/ptp-clock-class-change",
            "dataType":"metric",
            "valueType":"decimal64.3",
            "value":"135"
         }
      ]
   }
}

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Example lock-state event

{
   "id":"305ec18b-1472-47b3-aadd-8f37933249a9",
   "type":"event.sync.ptp-status.ptp-state-change",
   "source":"/cluster/compute-1.example.com/ptp/ens2fx/master",
   "dataContentType":"application/json",
   "time":"2022-05-06T15:31:23.467684081Z",
   "data":{
      "version":"v1",
      "values":[
         {
            "resource":"/sync/ptp-status/lock-state",
            "dataType":"notification",
            "valueType":"enumeration",
            "value":"LOCKED"
         },
         {
            "resource":"/sync/ptp-status/lock-state",
            "dataType":"metric",
            "valueType":"decimal64.3",
            "value":"62"
         }
      ]
   }
}

{
   "id":"305ec18b-1472-47b3-aadd-8f37933249a9",
   "type":"event.sync.ptp-status.ptp-state-change",
   "source":"/cluster/compute-1.example.com/ptp/ens2fx/master",
   "dataContentType":"application/json",
   "time":"2022-05-06T15:31:23.467684081Z",
   "data":{
      "version":"v1",
      "values":[
         {
            "resource":"/sync/ptp-status/lock-state",
            "dataType":"notification",
            "valueType":"enumeration",
            "value":"LOCKED"
         },
         {
            "resource":"/sync/ptp-status/lock-state",
            "dataType":"metric",
            "valueType":"decimal64.3",
            "value":"62"
         }
      ]
   }
}

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17.8.6.5. api/ocloudNotifications/v1/{resource_address}/CurrentState

HTTP method

GET api/ocloudNotifications/v1/cluster/node/<node_name>/sync/ptp-status/lock-state/CurrentState

GET api/ocloudNotifications/v1/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state/CurrentState

GET api/ocloudNotifications/v1/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change/CurrentState

Description

Configure the CurrentState API endpoint to return the current state of the os-clock-sync-state, ptp-clock-class-change, or lock-state events for the cluster node.

os-clock-sync-state notifications describe the host operating system clock synchronization state. Can be in LOCKED or FREERUN state.
ptp-clock-class-change notifications describe the current state of the PTP clock class.
lock-state notifications describe the current status of the PTP equipment lock state. Can be in LOCKED, HOLDOVER or FREERUN state.

Table 17.8. Global path parameters
Parameter	Type
`resource_address`	string

Example lock-state API response

{
  "id": "c1ac3aa5-1195-4786-84f8-da0ea4462921",
  "type": "event.sync.ptp-status.ptp-state-change",
  "source": "/cluster/node/compute-1.example.com/sync/ptp-status/lock-state",
  "dataContentType": "application/json",
  "time": "2023-01-10T02:41:57.094981478Z",
  "data": {
    "version": "v1",
    "values": [
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "notification",
        "valueType": "enumeration",
        "value": "LOCKED"
      },
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "metric",
        "valueType": "decimal64.3",
        "value": "29"
      }
    ]
  }
}

{
  "id": "c1ac3aa5-1195-4786-84f8-da0ea4462921",
  "type": "event.sync.ptp-status.ptp-state-change",
  "source": "/cluster/node/compute-1.example.com/sync/ptp-status/lock-state",
  "dataContentType": "application/json",
  "time": "2023-01-10T02:41:57.094981478Z",
  "data": {
    "version": "v1",
    "values": [
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "notification",
        "valueType": "enumeration",
        "value": "LOCKED"
      },
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "metric",
        "valueType": "decimal64.3",
        "value": "29"
      }
    ]
  }
}

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Example os-clock-sync-state API response

{
  "specversion": "0.3",
  "id": "4f51fe99-feaa-4e66-9112-66c5c9b9afcb",
  "source": "/cluster/node/compute-1.example.com/sync/sync-status/os-clock-sync-state",
  "type": "event.sync.sync-status.os-clock-sync-state-change",
  "subject": "/cluster/node/compute-1.example.com/sync/sync-status/os-clock-sync-state",
  "datacontenttype": "application/json",
  "time": "2022-11-29T17:44:22.202Z",
  "data": {
    "version": "v1",
    "values": [
      {
        "resource": "/cluster/node/compute-1.example.com/CLOCK_REALTIME",
        "dataType": "notification",
        "valueType": "enumeration",
        "value": "LOCKED"
      },
      {
        "resource": "/cluster/node/compute-1.example.com/CLOCK_REALTIME",
        "dataType": "metric",
        "valueType": "decimal64.3",
        "value": "27"
      }
    ]
  }
}

{
  "specversion": "0.3",
  "id": "4f51fe99-feaa-4e66-9112-66c5c9b9afcb",
  "source": "/cluster/node/compute-1.example.com/sync/sync-status/os-clock-sync-state",
  "type": "event.sync.sync-status.os-clock-sync-state-change",
  "subject": "/cluster/node/compute-1.example.com/sync/sync-status/os-clock-sync-state",
  "datacontenttype": "application/json",
  "time": "2022-11-29T17:44:22.202Z",
  "data": {
    "version": "v1",
    "values": [
      {
        "resource": "/cluster/node/compute-1.example.com/CLOCK_REALTIME",
        "dataType": "notification",
        "valueType": "enumeration",
        "value": "LOCKED"
      },
      {
        "resource": "/cluster/node/compute-1.example.com/CLOCK_REALTIME",
        "dataType": "metric",
        "valueType": "decimal64.3",
        "value": "27"
      }
    ]
  }
}

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Example ptp-clock-class-change API response

{
  "id": "064c9e67-5ad4-4afb-98ff-189c6aa9c205",
  "type": "event.sync.ptp-status.ptp-clock-class-change",
  "source": "/cluster/node/compute-1.example.com/sync/ptp-status/ptp-clock-class-change",
  "dataContentType": "application/json",
  "time": "2023-01-10T02:41:56.785673989Z",
  "data": {
    "version": "v1",
    "values": [
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "metric",
        "valueType": "decimal64.3",
        "value": "165"
      }
    ]
  }
}

{
  "id": "064c9e67-5ad4-4afb-98ff-189c6aa9c205",
  "type": "event.sync.ptp-status.ptp-clock-class-change",
  "source": "/cluster/node/compute-1.example.com/sync/ptp-status/ptp-clock-class-change",
  "dataContentType": "application/json",
  "time": "2023-01-10T02:41:56.785673989Z",
  "data": {
    "version": "v1",
    "values": [
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "metric",
        "valueType": "decimal64.3",
        "value": "165"
      }
    ]
  }
}

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17.8.7. Monitoring PTP fast event metrics

You can monitor PTP fast events metrics from cluster nodes where the linuxptp-daemon is running. You can also monitor PTP fast event metrics in the OpenShift Container Platform web console by using the preconfigured and self-updating Prometheus monitoring stack.

Prerequisites

Install the OpenShift Container Platform CLI oc.
Log in as a user with cluster-admin privileges.
Install and configure the PTP Operator on a node with PTP-capable hardware.

Procedure

Check for exposed PTP metrics on any node where the linuxptp-daemon is running. For example, run the following command:

curl http://<node_name>:9091/metrics

$ curl http://<node_name>:9091/metrics

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Example output

HELP openshift_ptp_clock_state 0 = FREERUN, 1 = LOCKED, 2 = HOLDOVER
TYPE openshift_ptp_clock_state gauge
HELP openshift_ptp_delay_ns
TYPE openshift_ptp_delay_ns gauge
HELP openshift_ptp_offset_ns
TYPE openshift_ptp_offset_ns gauge

# HELP openshift_ptp_clock_state 0 = FREERUN, 1 = LOCKED, 2 = HOLDOVER
# TYPE openshift_ptp_clock_state gauge
openshift_ptp_clock_state{iface="ens1fx",node="compute-1.example.com",process="ptp4l"} 1
openshift_ptp_clock_state{iface="ens3fx",node="compute-1.example.com",process="ptp4l"} 1
openshift_ptp_clock_state{iface="ens5fx",node="compute-1.example.com",process="ptp4l"} 1
openshift_ptp_clock_state{iface="ens7fx",node="compute-1.example.com",process="ptp4l"} 1
# HELP openshift_ptp_delay_ns
# TYPE openshift_ptp_delay_ns gauge
openshift_ptp_delay_ns{from="master",iface="ens1fx",node="compute-1.example.com",process="ptp4l"} 842
openshift_ptp_delay_ns{from="master",iface="ens3fx",node="compute-1.example.com",process="ptp4l"} 480
openshift_ptp_delay_ns{from="master",iface="ens5fx",node="compute-1.example.com",process="ptp4l"} 584
openshift_ptp_delay_ns{from="master",iface="ens7fx",node="compute-1.example.com",process="ptp4l"} 482
openshift_ptp_delay_ns{from="phc",iface="CLOCK_REALTIME",node="compute-1.example.com",process="phc2sys"} 547
# HELP openshift_ptp_offset_ns
# TYPE openshift_ptp_offset_ns gauge
openshift_ptp_offset_ns{from="master",iface="ens1fx",node="compute-1.example.com",process="ptp4l"} -2
openshift_ptp_offset_ns{from="master",iface="ens3fx",node="compute-1.example.com",process="ptp4l"} -44
openshift_ptp_offset_ns{from="master",iface="ens5fx",node="compute-1.example.com",process="ptp4l"} -8
openshift_ptp_offset_ns{from="master",iface="ens7fx",node="compute-1.example.com",process="ptp4l"} 3
openshift_ptp_offset_ns{from="phc",iface="CLOCK_REALTIME",node="compute-1.example.com",process="phc2sys"} 12

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To view the PTP event in the OpenShift Container Platform web console, copy the name of the PTP metric you want to query, for example, openshift_ptp_offset_ns.
In the OpenShift Container Platform web console, click Observe → Metrics.
Paste the PTP metric name into the Expression field, and click Run queries.

Chapter 18. Developing Precision Time Protocol events consumer applications

When developing consumer applications that make use of Precision Time Protocol (PTP) events on a bare-metal cluster node, you need to deploy your consumer application and a cloud-event-proxy container in a separate application pod. The cloud-event-proxy container receives the events from the PTP Operator pod and passes it to the consumer application. The consumer application subscribes to the events posted in the cloud-event-proxy container by using a REST API.

For more information about deploying PTP events applications, see About the PTP fast event notifications framework.

Note

The following information provides general guidance for developing consumer applications that use PTP events. A complete events consumer application example is outside the scope of this information.

18.1. PTP events consumer application reference

PTP event consumer applications require the following features:

A web service running with a POST handler to receive the cloud native PTP events JSON payload
A createSubscription function to subscribe to the PTP events producer
A getCurrentState function to poll the current state of the PTP events producer

The following example Go snippets illustrate these requirements:

Example PTP events consumer server function in Go

func server() {
  http.HandleFunc("/event", getEvent)
  http.ListenAndServe("localhost:8989", nil)
}

func getEvent(w http.ResponseWriter, req *http.Request) {
  defer req.Body.Close()
  bodyBytes, err := io.ReadAll(req.Body)
  if err != nil {
    log.Errorf("error reading event %v", err)
  }
  e := string(bodyBytes)
  if e != "" {
    processEvent(bodyBytes)
    log.Infof("received event %s", string(bodyBytes))
  } else {
    w.WriteHeader(http.StatusNoContent)
  }
}

func server() {
  http.HandleFunc("/event", getEvent)
  http.ListenAndServe("localhost:8989", nil)
}

func getEvent(w http.ResponseWriter, req *http.Request) {
  defer req.Body.Close()
  bodyBytes, err := io.ReadAll(req.Body)
  if err != nil {
    log.Errorf("error reading event %v", err)
  }
  e := string(bodyBytes)
  if e != "" {
    processEvent(bodyBytes)
    log.Infof("received event %s", string(bodyBytes))
  } else {
    w.WriteHeader(http.StatusNoContent)
  }
}

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Example PTP events createSubscription function in Go

import (
"github.com/redhat-cne/sdk-go/pkg/pubsub"
"github.com/redhat-cne/sdk-go/pkg/types"
v1pubsub "github.com/redhat-cne/sdk-go/v1/pubsub"
)

// Subscribe to PTP events using REST API
s1,_:=createsubscription("/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state") 
s2,_:=createsubscription("/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change")
s3,_:=createsubscription("/cluster/node/<node_name>/sync/ptp-status/lock-state")

// Create PTP event subscriptions POST
func createSubscription(resourceAddress string) (sub pubsub.PubSub, err error) {
  var status int
      apiPath:= "/api/ocloudNotifications/v1/"
      localAPIAddr:=localhost:8989 // vDU service API address
      apiAddr:= "localhost:8089" // event framework API address

  subURL := &types.URI{URL: url.URL{Scheme: "http",
    Host: apiAddr
    Path: fmt.Sprintf("%s%s", apiPath, "subscriptions")}}
  endpointURL := &types.URI{URL: url.URL{Scheme: "http",
    Host: localAPIAddr,
    Path: "event"}}

  sub = v1pubsub.NewPubSub(endpointURL, resourceAddress)
  var subB []byte

  if subB, err = json.Marshal(&sub); err == nil {
    rc := restclient.New()
    if status, subB = rc.PostWithReturn(subURL, subB); status != http.StatusCreated {
      err = fmt.Errorf("error in subscription creation api at %s, returned status %d", subURL, status)
    } else {
      err = json.Unmarshal(subB, &sub)
    }
  } else {
    err = fmt.Errorf("failed to marshal subscription for %s", resourceAddress)
  }
  return
}

import (
"github.com/redhat-cne/sdk-go/pkg/pubsub"
"github.com/redhat-cne/sdk-go/pkg/types"
v1pubsub "github.com/redhat-cne/sdk-go/v1/pubsub"
)

// Subscribe to PTP events using REST API
s1,_:=createsubscription("/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state")

1


s2,_:=createsubscription("/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change")
s3,_:=createsubscription("/cluster/node/<node_name>/sync/ptp-status/lock-state")

// Create PTP event subscriptions POST
func createSubscription(resourceAddress string) (sub pubsub.PubSub, err error) {
  var status int
      apiPath:= "/api/ocloudNotifications/v1/"
      localAPIAddr:=localhost:8989 // vDU service API address
      apiAddr:= "localhost:8089" // event framework API address

  subURL := &types.URI{URL: url.URL{Scheme: "http",
    Host: apiAddr
    Path: fmt.Sprintf("%s%s", apiPath, "subscriptions")}}
  endpointURL := &types.URI{URL: url.URL{Scheme: "http",
    Host: localAPIAddr,
    Path: "event"}}

  sub = v1pubsub.NewPubSub(endpointURL, resourceAddress)
  var subB []byte

  if subB, err = json.Marshal(&sub); err == nil {
    rc := restclient.New()
    if status, subB = rc.PostWithReturn(subURL, subB); status != http.StatusCreated {
      err = fmt.Errorf("error in subscription creation api at %s, returned status %d", subURL, status)
    } else {
      err = json.Unmarshal(subB, &sub)
    }
  } else {
    err = fmt.Errorf("failed to marshal subscription for %s", resourceAddress)
  }
  return
}

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1: Replace <node_name> with the FQDN of the node that is generating the PTP events. For example, compute-1.example.com.

Example PTP events consumer getCurrentState function in Go

//Get PTP event state for the resource
func getCurrentState(resource string) {
  //Create publisher
  url := &types.URI{URL: url.URL{Scheme: "http",
    Host: localhost:8989,
    Path: fmt.SPrintf("/api/ocloudNotifications/v1/%s/CurrentState",resource}}
  rc := restclient.New()
  status, event := rc.Get(url)
  if status != http.StatusOK {
    log.Errorf("CurrentState:error %d from url %s, %s", status, url.String(), event)
  } else {
    log.Debugf("Got CurrentState: %s ", event)
  }
}

//Get PTP event state for the resource
func getCurrentState(resource string) {
  //Create publisher
  url := &types.URI{URL: url.URL{Scheme: "http",
    Host: localhost:8989,
    Path: fmt.SPrintf("/api/ocloudNotifications/v1/%s/CurrentState",resource}}
  rc := restclient.New()
  status, event := rc.Get(url)
  if status != http.StatusOK {
    log.Errorf("CurrentState:error %d from url %s, %s", status, url.String(), event)
  } else {
    log.Debugf("Got CurrentState: %s ", event)
  }
}

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18.2. Reference cloud-event-proxy deployment and service CRs

Use the following example cloud-event-proxy deployment and subscriber service CRs as a reference when deploying your PTP events consumer application.

Note

HTTP transport is the default transport for PTP and bare-metal events. Use HTTP transport instead of AMQP for PTP and bare-metal events where possible. AMQ Interconnect is EOL from 30 June 2024. Extended life cycle support (ELS) for AMQ Interconnect ends 29 November 2029. For more information see, Red Hat AMQ Interconnect support status.

Reference cloud-event-proxy deployment with HTTP transport

apiVersion: apps/v1
kind: Deployment
metadata:
  name: event-consumer-deployment
  namespace: <namespace>
  labels:
    app: consumer
spec:
  replicas: 1
  selector:
    matchLabels:
      app: consumer
  template:
    metadata:
      labels:
        app: consumer
    spec:
      serviceAccountName: sidecar-consumer-sa
      containers:
        - name: event-subscriber
          image: event-subscriber-app
        - name: cloud-event-proxy-as-sidecar
          image: openshift4/ose-cloud-event-proxy
          args:
            - "--metrics-addr=127.0.0.1:9091"
            - "--store-path=/store"
            - "--transport-host=consumer-events-subscription-service.cloud-events.svc.cluster.local:9043"
            - "--http-event-publishers=ptp-event-publisher-service-NODE_NAME.openshift-ptp.svc.cluster.local:9043"
            - "--api-port=8089"
          env:
            - name: NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: NODE_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.hostIP
              volumeMounts:
                - name: pubsubstore
                  mountPath: /store
          ports:
            - name: metrics-port
              containerPort: 9091
            - name: sub-port
              containerPort: 9043
          volumes:
            - name: pubsubstore
              emptyDir: {}

apiVersion: apps/v1
kind: Deployment
metadata:
  name: event-consumer-deployment
  namespace: <namespace>
  labels:
    app: consumer
spec:
  replicas: 1
  selector:
    matchLabels:
      app: consumer
  template:
    metadata:
      labels:
        app: consumer
    spec:
      serviceAccountName: sidecar-consumer-sa
      containers:
        - name: event-subscriber
          image: event-subscriber-app
        - name: cloud-event-proxy-as-sidecar
          image: openshift4/ose-cloud-event-proxy
          args:
            - "--metrics-addr=127.0.0.1:9091"
            - "--store-path=/store"
            - "--transport-host=consumer-events-subscription-service.cloud-events.svc.cluster.local:9043"
            - "--http-event-publishers=ptp-event-publisher-service-NODE_NAME.openshift-ptp.svc.cluster.local:9043"
            - "--api-port=8089"
          env:
            - name: NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: NODE_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.hostIP
              volumeMounts:
                - name: pubsubstore
                  mountPath: /store
          ports:
            - name: metrics-port
              containerPort: 9091
            - name: sub-port
              containerPort: 9043
          volumes:
            - name: pubsubstore
              emptyDir: {}

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Reference cloud-event-proxy deployment with AMQ transport

apiVersion: apps/v1
kind: Deployment
metadata:
  name: cloud-event-proxy-sidecar
  namespace: cloud-events
  labels:
    app: cloud-event-proxy
spec:
  selector:
    matchLabels:
      app: cloud-event-proxy
  template:
    metadata:
      labels:
        app: cloud-event-proxy
    spec:
      nodeSelector:
        node-role.kubernetes.io/worker: ""
      containers:
        - name: cloud-event-sidecar
          image: openshift4/ose-cloud-event-proxy
          args:
            - "--metrics-addr=127.0.0.1:9091"
            - "--store-path=/store"
            - "--transport-host=amqp://router.router.svc.cluster.local"
            - "--api-port=8089"
          env:
            - name: <node_name>
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: <node_ip>
              valueFrom:
                fieldRef:
                  fieldPath: status.hostIP
          volumeMounts:
            - name: pubsubstore
              mountPath: /store
          ports:
            - name: metrics-port
              containerPort: 9091
            - name: sub-port
              containerPort: 9043
          volumes:
            - name: pubsubstore
              emptyDir: {}

apiVersion: apps/v1
kind: Deployment
metadata:
  name: cloud-event-proxy-sidecar
  namespace: cloud-events
  labels:
    app: cloud-event-proxy
spec:
  selector:
    matchLabels:
      app: cloud-event-proxy
  template:
    metadata:
      labels:
        app: cloud-event-proxy
    spec:
      nodeSelector:
        node-role.kubernetes.io/worker: ""
      containers:
        - name: cloud-event-sidecar
          image: openshift4/ose-cloud-event-proxy
          args:
            - "--metrics-addr=127.0.0.1:9091"
            - "--store-path=/store"
            - "--transport-host=amqp://router.router.svc.cluster.local"
            - "--api-port=8089"
          env:
            - name: <node_name>
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
            - name: <node_ip>
              valueFrom:
                fieldRef:
                  fieldPath: status.hostIP
          volumeMounts:
            - name: pubsubstore
              mountPath: /store
          ports:
            - name: metrics-port
              containerPort: 9091
            - name: sub-port
              containerPort: 9043
          volumes:
            - name: pubsubstore
              emptyDir: {}

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Reference cloud-event-proxy subscriber service

apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: "true"
    service.alpha.openshift.io/serving-cert-secret-name: sidecar-consumer-secret
  name: consumer-events-subscription-service
  namespace: cloud-events
  labels:
    app: consumer-service
spec:
  ports:
    - name: sub-port
      port: 9043
  selector:
    app: consumer
  clusterIP: None
  sessionAffinity: None
  type: ClusterIP

apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: "true"
    service.alpha.openshift.io/serving-cert-secret-name: sidecar-consumer-secret
  name: consumer-events-subscription-service
  namespace: cloud-events
  labels:
    app: consumer-service
spec:
  ports:
    - name: sub-port
      port: 9043
  selector:
    app: consumer
  clusterIP: None
  sessionAffinity: None
  type: ClusterIP

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18.3. PTP events available from the cloud-event-proxy sidecar REST API

PTP events consumer applications can poll the PTP events producer for the following PTP timing events.

Table 18.1. PTP events available from the cloud-event-proxy sidecar
Resource URI	Description
`/cluster/node/<node_name>/sync/ptp-status/lock-state`	Describes the current status of the PTP equipment lock state. Can be in `LOCKED`, `HOLDOVER`, or `FREERUN` state.
`/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state`	Describes the host operating system clock synchronization state. Can be in `LOCKED` or `FREERUN` state.
`/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change`	Describes the current state of the PTP clock class.

18.4. Subscribing the consumer application to PTP events

Before the PTP events consumer application can poll for events, you need to subscribe the application to the event producer.

18.4.1. Subscribing to PTP lock-state events

To create a subscription for PTP lock-state events, send a POST action to the cloud event API at http://localhost:8081/api/ocloudNotifications/v1/subscriptions with the following payload:

{
"endpointUri": "http://localhost:8989/event",
"resource": "/cluster/node/<node_name>/sync/ptp-status/lock-state",
}

{
"endpointUri": "http://localhost:8989/event",
"resource": "/cluster/node/<node_name>/sync/ptp-status/lock-state",
}

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Example response

{
"id": "e23473d9-ba18-4f78-946e-401a0caeff90",
"endpointUri": "http://localhost:8989/event",
"uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/e23473d9-ba18-4f78-946e-401a0caeff90",
"resource": "/cluster/node/<node_name>/sync/ptp-status/lock-state",
}

{
"id": "e23473d9-ba18-4f78-946e-401a0caeff90",
"endpointUri": "http://localhost:8989/event",
"uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/e23473d9-ba18-4f78-946e-401a0caeff90",
"resource": "/cluster/node/<node_name>/sync/ptp-status/lock-state",
}

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18.4.2. Subscribing to PTP os-clock-sync-state events

To create a subscription for PTP os-clock-sync-state events, send a POST action to the cloud event API at http://localhost:8081/api/ocloudNotifications/v1/subscriptions with the following payload:

{
"endpointUri": "http://localhost:8989/event",
"resource": "/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state",
}

{
"endpointUri": "http://localhost:8989/event",
"resource": "/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state",
}

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Example response

{
"id": "e23473d9-ba18-4f78-946e-401a0caeff90",
"endpointUri": "http://localhost:8989/event",
"uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/e23473d9-ba18-4f78-946e-401a0caeff90",
"resource": "/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state",
}

{
"id": "e23473d9-ba18-4f78-946e-401a0caeff90",
"endpointUri": "http://localhost:8989/event",
"uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/e23473d9-ba18-4f78-946e-401a0caeff90",
"resource": "/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state",
}

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18.4.3. Subscribing to PTP ptp-clock-class-change events

To create a subscription for PTP ptp-clock-class-change events, send a POST action to the cloud event API at http://localhost:8081/api/ocloudNotifications/v1/subscriptions with the following payload:

{
"endpointUri": "http://localhost:8989/event",
"resource": "/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change",
}

{
"endpointUri": "http://localhost:8989/event",
"resource": "/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change",
}

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Example response

{
"id": "e23473d9-ba18-4f78-946e-401a0caeff90",
"endpointUri": "http://localhost:8989/event",
"uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/e23473d9-ba18-4f78-946e-401a0caeff90",
"resource": "/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change",
}

{
"id": "e23473d9-ba18-4f78-946e-401a0caeff90",
"endpointUri": "http://localhost:8989/event",
"uriLocation": "http://localhost:8089/api/ocloudNotifications/v1/subscriptions/e23473d9-ba18-4f78-946e-401a0caeff90",
"resource": "/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change",
}

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18.5. Getting the current PTP clock status

To get the current PTP status for the node, send a GET action to one of the following event REST APIs:

http://localhost:8081/api/ocloudNotifications/v1/cluster/node/<node_name>/sync/ptp-status/lock-state/CurrentState
http://localhost:8081/api/ocloudNotifications/v1/cluster/node/<node_name>/sync/sync-status/os-clock-sync-state/CurrentState
http://localhost:8081/api/ocloudNotifications/v1/cluster/node/<node_name>/sync/ptp-status/ptp-clock-class-change/CurrentState

The response is a cloud native event JSON object. For example:

Example lock-state API response

{
  "id": "c1ac3aa5-1195-4786-84f8-da0ea4462921",
  "type": "event.sync.ptp-status.ptp-state-change",
  "source": "/cluster/node/compute-1.example.com/sync/ptp-status/lock-state",
  "dataContentType": "application/json",
  "time": "2023-01-10T02:41:57.094981478Z",
  "data": {
    "version": "v1",
    "values": [
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "notification",
        "valueType": "enumeration",
        "value": "LOCKED"
      },
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "metric",
        "valueType": "decimal64.3",
        "value": "29"
      }
    ]
  }
}

{
  "id": "c1ac3aa5-1195-4786-84f8-da0ea4462921",
  "type": "event.sync.ptp-status.ptp-state-change",
  "source": "/cluster/node/compute-1.example.com/sync/ptp-status/lock-state",
  "dataContentType": "application/json",
  "time": "2023-01-10T02:41:57.094981478Z",
  "data": {
    "version": "v1",
    "values": [
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "notification",
        "valueType": "enumeration",
        "value": "LOCKED"
      },
      {
        "resource": "/cluster/node/compute-1.example.com/ens5fx/master",
        "dataType": "metric",
        "valueType": "decimal64.3",
        "value": "29"
      }
    ]
  }
}

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18.6. Verifying that the PTP events consumer application is receiving events

Verify that the cloud-event-proxy container in the application pod is receiving PTP events.

Prerequisites

You have installed the OpenShift CLI (oc).
You have logged in as a user with cluster-admin privileges.
You have installed and configured the PTP Operator.

Procedure

Get the list of active linuxptp-daemon pods. Run the following command:

oc get pods -n openshift-ptp

$ oc get pods -n openshift-ptp

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Example output

NAME                    READY   STATUS    RESTARTS   AGE
linuxptp-daemon-2t78p   3/3     Running   0          8h
linuxptp-daemon-k8n88   3/3     Running   0          8h

NAME                    READY   STATUS    RESTARTS   AGE
linuxptp-daemon-2t78p   3/3     Running   0          8h
linuxptp-daemon-k8n88   3/3     Running   0          8h

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Access the metrics for the required consumer-side cloud-event-proxy container by running the following command:

oc exec -it <linuxptp-daemon> -n openshift-ptp -c cloud-event-proxy -- curl 127.0.0.1:9091/metrics

$ oc exec -it <linuxptp-daemon> -n openshift-ptp -c cloud-event-proxy -- curl 127.0.0.1:9091/metrics

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where:

<linuxptp-daemon>

Specifies the pod you want to query, for example, linuxptp-daemon-2t78p.

Example output

HELP cne_transport_connections_resets Metric to get number of connection resets
TYPE cne_transport_connections_resets gauge
HELP cne_transport_receiver Metric to get number of receiver created
TYPE cne_transport_receiver gauge
HELP cne_transport_sender Metric to get number of sender created
TYPE cne_transport_sender gauge
HELP cne_events_ack Metric to get number of events produced
TYPE cne_events_ack gauge
HELP cne_events_transport_published Metric to get number of events published by the transport
TYPE cne_events_transport_published gauge
HELP cne_events_transport_received Metric to get number of events received  by the transport
TYPE cne_events_transport_received gauge
HELP cne_events_api_published Metric to get number of events published by the rest api
TYPE cne_events_api_published gauge
HELP cne_events_received Metric to get number of events received
TYPE cne_events_received gauge
HELP promhttp_metric_handler_requests_in_flight Current number of scrapes being served.
TYPE promhttp_metric_handler_requests_in_flight gauge
HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.
TYPE promhttp_metric_handler_requests_total counter

# HELP cne_transport_connections_resets Metric to get number of connection resets
# TYPE cne_transport_connections_resets gauge
cne_transport_connection_reset 1
# HELP cne_transport_receiver Metric to get number of receiver created
# TYPE cne_transport_receiver gauge
cne_transport_receiver{address="/cluster/node/compute-1.example.com/ptp",status="active"} 2
cne_transport_receiver{address="/cluster/node/compute-1.example.com/redfish/event",status="active"} 2
# HELP cne_transport_sender Metric to get number of sender created
# TYPE cne_transport_sender gauge
cne_transport_sender{address="/cluster/node/compute-1.example.com/ptp",status="active"} 1
cne_transport_sender{address="/cluster/node/compute-1.example.com/redfish/event",status="active"} 1
# HELP cne_events_ack Metric to get number of events produced
# TYPE cne_events_ack gauge
cne_events_ack{status="success",type="/cluster/node/compute-1.example.com/ptp"} 18
cne_events_ack{status="success",type="/cluster/node/compute-1.example.com/redfish/event"} 18
# HELP cne_events_transport_published Metric to get number of events published by the transport
# TYPE cne_events_transport_published gauge
cne_events_transport_published{address="/cluster/node/compute-1.example.com/ptp",status="failed"} 1
cne_events_transport_published{address="/cluster/node/compute-1.example.com/ptp",status="success"} 18
cne_events_transport_published{address="/cluster/node/compute-1.example.com/redfish/event",status="failed"} 1
cne_events_transport_published{address="/cluster/node/compute-1.example.com/redfish/event",status="success"} 18
# HELP cne_events_transport_received Metric to get number of events received  by the transport
# TYPE cne_events_transport_received gauge
cne_events_transport_received{address="/cluster/node/compute-1.example.com/ptp",status="success"} 18
cne_events_transport_received{address="/cluster/node/compute-1.example.com/redfish/event",status="success"} 18
# HELP cne_events_api_published Metric to get number of events published by the rest api
# TYPE cne_events_api_published gauge
cne_events_api_published{address="/cluster/node/compute-1.example.com/ptp",status="success"} 19
cne_events_api_published{address="/cluster/node/compute-1.example.com/redfish/event",status="success"} 19
# HELP cne_events_received Metric to get number of events received
# TYPE cne_events_received gauge
cne_events_received{status="success",type="/cluster/node/compute-1.example.com/ptp"} 18
cne_events_received{status="success",type="/cluster/node/compute-1.example.com/redfish/event"} 18
# HELP promhttp_metric_handler_requests_in_flight Current number of scrapes being served.
# TYPE promhttp_metric_handler_requests_in_flight gauge
promhttp_metric_handler_requests_in_flight 1
# HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.
# TYPE promhttp_metric_handler_requests_total counter
promhttp_metric_handler_requests_total{code="200"} 4
promhttp_metric_handler_requests_total{code="500"} 0
promhttp_metric_handler_requests_total{code="503"} 0

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Chapter 19. External DNS Operator

19.1. External DNS Operator in OpenShift Container Platform

The External DNS Operator deploys and manages ExternalDNS to provide the name resolution for services and routes from the external DNS provider to OpenShift Container Platform.

19.1.1. External DNS Operator

The External DNS Operator implements the External DNS API from the olm.openshift.io API group. The External DNS Operator updates services, routes, and external DNS providers.

Prerequisites

You have installed the yq CLI tool.

Procedure

You can deploy the External DNS Operator on demand from the OperatorHub. Deploying the External DNS Operator creates a Subscription object.

Check the name of an install plan by running the following command:

oc -n external-dns-operator get sub external-dns-operator -o yaml | yq '.status.installplan.name'

$ oc -n external-dns-operator get sub external-dns-operator -o yaml | yq '.status.installplan.name'

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Example output

install-zcvlr

install-zcvlr

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Check if the status of an install plan is Complete by running the following command:

oc -n external-dns-operator get ip <install_plan_name> -o yaml | yq '.status.phase'

$ oc -n external-dns-operator get ip <install_plan_name> -o yaml | yq '.status.phase'

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Example output

Complete

Complete

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View the status of the external-dns-operator deployment by running the following command:

oc get -n external-dns-operator deployment/external-dns-operator

$ oc get -n external-dns-operator deployment/external-dns-operator

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Example output

NAME                    READY     UP-TO-DATE   AVAILABLE   AGE
external-dns-operator   1/1       1            1           23h

NAME                    READY     UP-TO-DATE   AVAILABLE   AGE
external-dns-operator   1/1       1            1           23h

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19.1.2. External DNS Operator logs

You can view External DNS Operator logs by using the oc logs command.

Procedure

View the logs of the External DNS Operator by running the following command:

oc logs -n external-dns-operator deployment/external-dns-operator -c external-dns-operator

$ oc logs -n external-dns-operator deployment/external-dns-operator -c external-dns-operator

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19.1.2.1. External DNS Operator domain name limitations

The External DNS Operator uses the TXT registry which adds the prefix for TXT records. This reduces the maximum length of the domain name for TXT records. A DNS record cannot be present without a corresponding TXT record, so the domain name of the DNS record must follow the same limit as the TXT records. For example, a DNS record of <domain_name_from_source> results in a TXT record of external-dns-<record_type>-<domain_name_from_source>.

The domain name of the DNS records generated by the External DNS Operator has the following limitations:

Record type	Number of characters
CNAME	44
Wildcard CNAME records on AzureDNS	42
A	48
Wildcard A records on AzureDNS	46

The following error appears in the External DNS Operator logs if the generated domain name exceeds any of the domain name limitations:

time="2022-09-02T08:53:57Z" level=error msg="Failure in zone test.example.io. [Id: /hostedzone/Z06988883Q0H0RL6UMXXX]"
time="2022-09-02T08:53:57Z" level=error msg="InvalidChangeBatch: [FATAL problem: DomainLabelTooLong (Domain label is too long) encountered with 'external-dns-a-hello-openshift-aaaaaaaaaa-bbbbbbbbbb-ccccccc']\n\tstatus code: 400, request id: e54dfd5a-06c6-47b0-bcb9-a4f7c3a4e0c6"

time="2022-09-02T08:53:57Z" level=error msg="Failure in zone test.example.io. [Id: /hostedzone/Z06988883Q0H0RL6UMXXX]"
time="2022-09-02T08:53:57Z" level=error msg="InvalidChangeBatch: [FATAL problem: DomainLabelTooLong (Domain label is too long) encountered with 'external-dns-a-hello-openshift-aaaaaaaaaa-bbbbbbbbbb-ccccccc']\n\tstatus code: 400, request id: e54dfd5a-06c6-47b0-bcb9-a4f7c3a4e0c6"

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19.2. Installing External DNS Operator on cloud providers

You can install the External DNS Operator on cloud providers such as AWS, Azure, and GCP.

19.2.1. Installing the External DNS Operator with OperatorHub

You can install the External DNS Operator by using the OpenShift Container Platform OperatorHub.

Procedure

Click Operators → OperatorHub in the OpenShift Container Platform web console.
Click External DNS Operator. You can use the Filter by keyword text box or the filter list to search for External DNS Operator from the list of Operators.
Select the external-dns-operator namespace.
On the External DNS Operator page, click Install.
On the Install Operator page, ensure that you selected the following options:
1. Update the channel as stable-v1.
2. Installation mode as A specific name on the cluster.
3. Installed namespace as external-dns-operator. If namespace external-dns-operator does not exist, it gets created during the Operator installation.
4. Select Approval Strategy as Automatic or Manual. Approval Strategy is set to Automatic by default.
5. Click Install.

If you select Automatic updates, the Operator Lifecycle Manager (OLM) automatically upgrades the running instance of your Operator without any intervention.

If you select Manual updates, the OLM creates an update request. As a cluster administrator, you must then manually approve that update request to have the Operator updated to the new version.

Verification

Verify that the External DNS Operator shows the Status as Succeeded on the Installed Operators dashboard.

19.2.2. Installing the External DNS Operator by using the CLI

You can install the External DNS Operator by using the CLI.

Prerequisites

You are logged in to the OpenShift Container Platform web console as a user with cluster-admin permissions.
You are logged into the OpenShift CLI (oc).

Procedure

Create a Namespace object:
1. Create a YAML file that defines the Namespace object:
  Example namespace.yaml file
  apiVersion: v1 kind: Namespace metadata: name: external-dns-operator
  
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2. Create the Namespace object by running the following command:
  $ oc apply -f namespace.yaml
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Create an OperatorGroup object:

Create a YAML file that defines the OperatorGroup object:

Example operatorgroup.yaml file

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: external-dns-operator
  namespace: external-dns-operator
spec:
  upgradeStrategy: Default
  targetNamespaces:
  - external-dns-operator

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: external-dns-operator
  namespace: external-dns-operator
spec:
  upgradeStrategy: Default
  targetNamespaces:
  - external-dns-operator

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Create the OperatorGroup object by running the following command:
```
oc apply -f operatorgroup.yaml
```
```
$ oc apply -f operatorgroup.yaml
```
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Create a Subscription object:

Create a YAML file that defines the Subscription object:

Example subscription.yaml file

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: external-dns-operator
  namespace: external-dns-operator
spec:
  channel: stable-v1
  installPlanApproval: Automatic
  name: external-dns-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: external-dns-operator
  namespace: external-dns-operator
spec:
  channel: stable-v1
  installPlanApproval: Automatic
  name: external-dns-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace

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Create the Subscription object by running the following command:
```
oc apply -f subscription.yaml
```
```
$ oc apply -f subscription.yaml
```
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Verification

Get the name of the install plan from the subscription by running the following command:

oc -n external-dns-operator \
    get subscription external-dns-operator \
    --template='{{.status.installplan.name}}{{"\n"}}'

$ oc -n external-dns-operator \
    get subscription external-dns-operator \
    --template='{{.status.installplan.name}}{{"\n"}}'

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Verify that the status of the install plan is Complete by running the following command:

oc -n external-dns-operator \
    get ip <install_plan_name> \
    --template='{{.status.phase}}{{"\n"}}'

$ oc -n external-dns-operator \
    get ip <install_plan_name> \
    --template='{{.status.phase}}{{"\n"}}'

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Verify that the status of the external-dns-operator pod is Running by running the following command:

oc -n external-dns-operator get pod

$ oc -n external-dns-operator get pod

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Example output

NAME                                     READY   STATUS    RESTARTS   AGE
external-dns-operator-5584585fd7-5lwqm   2/2     Running   0          11m

NAME                                     READY   STATUS    RESTARTS   AGE
external-dns-operator-5584585fd7-5lwqm   2/2     Running   0          11m

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Verify that the catalog source of the subscription is redhat-operators by running the following command:

oc -n external-dns-operator get subscription

$ oc -n external-dns-operator get subscription

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Example output

NAME                    PACKAGE                 SOURCE             CHANNEL
external-dns-operator   external-dns-operator   redhat-operators   stable-v1

NAME                    PACKAGE                 SOURCE             CHANNEL
external-dns-operator   external-dns-operator   redhat-operators   stable-v1

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Check the external-dns-operator version by running the following command:

oc -n external-dns-operator get csv

$ oc -n external-dns-operator get csv

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Example output

NAME                           DISPLAY                VERSION   REPLACES   PHASE
external-dns-operator.v<1.y.z>   ExternalDNS Operator   <1.y.z>                Succeeded

NAME                           DISPLAY                VERSION   REPLACES   PHASE
external-dns-operator.v<1.y.z>   ExternalDNS Operator   <1.y.z>                Succeeded

Copy to Clipboard

19.3. External DNS Operator configuration parameters

The External DNS Operator includes the following configuration parameters.

19.3.1. External DNS Operator configuration parameters

The External DNS Operator includes the following configuration parameters:

Parameter	Description
`spec`	Enables the type of a cloud provider. `spec: provider: type: AWS` 1 `aws: credentials: name: aws-access-key` 2 Copy to Clipboard 1 Defines available options such as AWS, GCP, Azure, and Infoblox. 2 Defines a secret name for your cloud provider.
`zones`	Enables you to specify DNS zones by their domains. If you do not specify zones, the `ExternalDNS` resource discovers all of the zones present in your cloud provider account. `zones: - "myzoneid"` 1 Copy to Clipboard 1 Specifies the name of DNS zones.
`domains`	Enables you to specify AWS zones by their domains. If you do not specify domains, the `ExternalDNS` resource discovers all of the zones present in your cloud provider account. `domains: - filterType: Include` 1 `matchType: Exact` 2 `name: "myzonedomain1.com"` 3 `- filterType: Include matchType: Pattern` 4 `pattern: ".*\\.otherzonedomain\\.com"` 5 Copy to Clipboard 1 Ensures that the `ExternalDNS` resource includes the domain name. 2 Instructs `ExternalDNS` that the domain matching has to be exact as opposed to regular expression match. 3 Defines the name of the domain. 4 Sets the `regex-domain-filter` flag in the `ExternalDNS` resource. You can limit possible domains by using a Regex filter. 5 Defines the regex pattern to be used by the `ExternalDNS` resource to filter the domains of the target zones.
`source`	Enables you to specify the source for the DNS records, `Service` or `Route`. `source:` 1 `type: Service` 2 `service: serviceType:` 3 `- LoadBalancer - ClusterIP labelFilter:` 4 `matchLabels: external-dns.mydomain.org/publish: "yes" hostnameAnnotation: "Allow"` 5 `fqdnTemplate: - "{{.Name}}.myzonedomain.com"` 6 Copy to Clipboard 1 Defines the settings for the source of DNS records. 2 The `ExternalDNS` resource uses the `Service` type as the source for creating DNS records. 3 Sets the `service-type-filter` flag in the `ExternalDNS` resource. The `serviceType` contains the following fields: `default`: `LoadBalancer` `expected`: `ClusterIP` `NodePort` `LoadBalancer` `ExternalName` 4 Ensures that the controller considers only those resources which matches with label filter. 5 The default value for `hostnameAnnotation` is `Ignore` which instructs `ExternalDNS` to generate DNS records using the templates specified in the field `fqdnTemplates`. When the value is `Allow` the DNS records get generated based on the value specified in the `external-dns.alpha.kubernetes.io/hostname` annotation. 6 The External DNS Operator uses a string to generate DNS names from sources that don’t define a hostname, or to add a hostname suffix when paired with the fake source. `source: type: OpenShiftRoute` 1 `openshiftRouteOptions: routerName: default` 2 `labelFilter: matchLabels: external-dns.mydomain.org/publish: "yes"` Copy to Clipboard 1 Creates DNS records. 2 If the source type is `OpenShiftRoute`, then you can pass the Ingress Controller name. The `ExternalDNS` resource uses the canonical name of the Ingress Controller as the target for CNAME records.

19.4. Creating DNS records on AWS

You can create DNS records on AWS and AWS GovCloud by using External DNS Operator.

19.4.1. Creating DNS records on an public hosted zone for AWS by using Red Hat External DNS Operator

You can create DNS records on a public hosted zone for AWS by using the Red Hat External DNS Operator. You can use the same instructions to create DNS records on a hosted zone for AWS GovCloud.

Procedure

Check the user. The user must have access to the kube-system namespace. If you don’t have the credentials, as you can fetch the credentials from the kube-system namespace to use the cloud provider client:
```
oc whoami
```
```
$ oc whoami
```
Copy to Clipboard
Example output
```
system:admin
```
```
system:admin
```
Copy to Clipboard

Fetch the values from aws-creds secret present in kube-system namespace.

export AWS_ACCESS_KEY_ID=$(oc get secrets aws-creds -n kube-system  --template={{.data.aws_access_key_id}} | base64 -d)
export AWS_SECRET_ACCESS_KEY=$(oc get secrets aws-creds -n kube-system  --template={{.data.aws_secret_access_key}} | base64 -d)

$ export AWS_ACCESS_KEY_ID=$(oc get secrets aws-creds -n kube-system  --template={{.data.aws_access_key_id}} | base64 -d)
$ export AWS_SECRET_ACCESS_KEY=$(oc get secrets aws-creds -n kube-system  --template={{.data.aws_secret_access_key}} | base64 -d)

Copy to Clipboard

Get the routes to check the domain:

oc get routes --all-namespaces | grep console

$ oc get routes --all-namespaces | grep console

Copy to Clipboard

Example output

openshift-console          console             console-openshift-console.apps.testextdnsoperator.apacshift.support                       console             https   reencrypt/Redirect     None
openshift-console          downloads           downloads-openshift-console.apps.testextdnsoperator.apacshift.support                     downloads           http    edge/Redirect          None

openshift-console          console             console-openshift-console.apps.testextdnsoperator.apacshift.support                       console             https   reencrypt/Redirect     None
openshift-console          downloads           downloads-openshift-console.apps.testextdnsoperator.apacshift.support                     downloads           http    edge/Redirect          None

Copy to Clipboard

Get the list of dns zones to find the one which corresponds to the previously found route’s domain:

aws route53 list-hosted-zones | grep testextdnsoperator.apacshift.support

$ aws route53 list-hosted-zones | grep testextdnsoperator.apacshift.support

Copy to Clipboard

Example output

HOSTEDZONES	terraform	/hostedzone/Z02355203TNN1XXXX1J6O	testextdnsoperator.apacshift.support.	5

HOSTEDZONES	terraform	/hostedzone/Z02355203TNN1XXXX1J6O	testextdnsoperator.apacshift.support.	5

Copy to Clipboard

Create ExternalDNS resource for route source:
```
$ cat <<EOF | oc create -f -
apiVersion: externaldns.olm.openshift.io/v1beta1
kind: ExternalDNS
metadata:
  name: sample-aws 
spec:
  domains:
  - filterType: Include   
    matchType: Exact   
    name: testextdnsoperator.apacshift.support 
  provider:
    type: AWS 
  source:  
    type: OpenShiftRoute 
    openshiftRouteOptions:
      routerName: default 
EOF
```
```
$ cat <<EOF | oc create -f -
apiVersion: externaldns.olm.openshift.io/v1beta1
kind: ExternalDNS
metadata:
  name: sample-aws 
```
1
```
spec:
  domains:
  - filterType: Include   
```
2
```
    matchType: Exact   
```
3
```
    name: testextdnsoperator.apacshift.support 
```
4
```
  provider:
    type: AWS 
```
5
```
  source:  
```
6
```
    type: OpenShiftRoute 
```
7
```
    openshiftRouteOptions:
      routerName: default 
```
8
```
EOF
```
Copy to Clipboard
1
Defines the name of external DNS resource.
2
By default all hosted zones are selected as potential targets. You can include a hosted zone that you need.
3
The matching of the target zone’s domain has to be exact (as opposed to regular expression match).
4
Specify the exact domain of the zone you want to update. The hostname of the routes must be subdomains of the specified domain.
5
Defines the AWS Route53 DNS provider.
6
Defines options for the source of DNS records.
7
Defines OpenShift route resource as the source for the DNS records which gets created in the previously specified DNS provider.
8
If the source is OpenShiftRoute, then you can pass the OpenShift Ingress Controller name. External DNS Operator selects the canonical hostname of that router as the target while creating CNAME record.

Check the records created for OCP routes using the following command:

aws route53 list-resource-record-sets --hosted-zone-id Z02355203TNN1XXXX1J6O --query "ResourceRecordSets[?Type == 'CNAME']" | grep console

$ aws route53 list-resource-record-sets --hosted-zone-id Z02355203TNN1XXXX1J6O --query "ResourceRecordSets[?Type == 'CNAME']" | grep console

Copy to Clipboard

19.5. Creating DNS records on Azure

You can create DNS records on Azure by using the External DNS Operator.

Important

Using the External DNS Operator on a {entra-first}-enabled cluster or a cluster that runs in Microsoft Azure Government (MAG) regions is not supported.

19.5.1. Creating DNS records on an Azure public DNS zone

You can create DNS records on a public DNS zone for Azure by using the External DNS Operator.

Prerequisites

You must have administrator privileges.
The admin user must have access to the kube-system namespace.

Procedure

Fetch the credentials from the kube-system namespace to use the cloud provider client by running the following command:

CLIENT_ID=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_client_id}} | base64 -d)
CLIENT_SECRET=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_client_secret}} | base64 -d)
RESOURCE_GROUP=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_resourcegroup}} | base64 -d)
SUBSCRIPTION_ID=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_subscription_id}} | base64 -d)
TENANT_ID=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_tenant_id}} | base64 -d)

$ CLIENT_ID=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_client_id}} | base64 -d)
$ CLIENT_SECRET=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_client_secret}} | base64 -d)
$ RESOURCE_GROUP=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_resourcegroup}} | base64 -d)
$ SUBSCRIPTION_ID=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_subscription_id}} | base64 -d)
$ TENANT_ID=$(oc get secrets azure-credentials  -n kube-system  --template={{.data.azure_tenant_id}} | base64 -d)

Copy to Clipboard

Log in to Azure by running the following command:

az login --service-principal -u "${CLIENT_ID}" -p "${CLIENT_SECRET}" --tenant "${TENANT_ID}"

$ az login --service-principal -u "${CLIENT_ID}" -p "${CLIENT_SECRET}" --tenant "${TENANT_ID}"

Copy to Clipboard

Get a list of routes by running the following command:

oc get routes --all-namespaces | grep console

$ oc get routes --all-namespaces | grep console

Copy to Clipboard

Example output

openshift-console          console             console-openshift-console.apps.test.azure.example.com                       console             https   reencrypt/Redirect     None
openshift-console          downloads           downloads-openshift-console.apps.test.azure.example.com                     downloads           http    edge/Redirect          None

openshift-console          console             console-openshift-console.apps.test.azure.example.com                       console             https   reencrypt/Redirect     None
openshift-console          downloads           downloads-openshift-console.apps.test.azure.example.com                     downloads           http    edge/Redirect          None

Copy to Clipboard

Get a list of DNS zones by running the following command:

az network dns zone list --resource-group "${RESOURCE_GROUP}"

$ az network dns zone list --resource-group "${RESOURCE_GROUP}"

Copy to Clipboard

Create a YAML file, for example, external-dns-sample-azure.yaml, that defines the ExternalDNS object:

Example external-dns-sample-azure.yaml file

apiVersion: externaldns.olm.openshift.io/v1beta1
kind: ExternalDNS
metadata:
  name: sample-azure 
spec:
  zones:
  - "/subscriptions/1234567890/resourceGroups/test-azure-xxxxx-rg/providers/Microsoft.Network/dnszones/test.azure.example.com" 
  provider:
    type: Azure 
  source:
    openshiftRouteOptions: 
      routerName: default 
    type: OpenShiftRoute

apiVersion: externaldns.olm.openshift.io/v1beta1
kind: ExternalDNS
metadata:
  name: sample-azure

1


spec:
  zones:
  - "/subscriptions/1234567890/resourceGroups/test-azure-xxxxx-rg/providers/Microsoft.Network/dnszones/test.azure.example.com"

2


  provider:
    type: Azure

3


  source:
    openshiftRouteOptions:

4


      routerName: default

5


    type: OpenShiftRoute

6

Copy to Clipboard

1: Specifies the External DNS name.
2: Defines the zone ID.
3: Defines the provider type.
4: You can define options for the source of DNS records.
5: If the source type is OpenShiftRoute, you can pass the OpenShift Ingress Controller name. External DNS selects the canonical hostname of that router as the target while creating CNAME record.
6: Defines the route resource as the source for the Azure DNS records.

Check the DNS records created for OpenShift Container Platform routes by running the following command:
```
az network dns record-set list -g "${RESOURCE_GROUP}"  -z test.azure.example.com | grep console
```
```
$ az network dns record-set list -g "${RESOURCE_GROUP}"  -z test.azure.example.com | grep console
```
Copy to Clipboard
Note
To create records on private hosted zones on private Azure DNS, you need to specify the private zone under the zones field which populates the provider type to azure-private-dns in the ExternalDNS container arguments.

19.6. Creating DNS records on GCP

You can create DNS records on Google Cloud Platform (GCP) by using the External DNS Operator.

Important

Using the External DNS Operator on a cluster with GCP Workload Identity enabled is not supported. For more information about the GCP Workload Identity, see Using manual mode with GCP Workload Identity.

19.6.1. Creating DNS records on a public managed zone for GCP

You can create DNS records on a public managed zone for GCP by using the External DNS Operator.

Prerequisites

You must have administrator privileges.

Procedure

Copy the gcp-credentials secret in the encoded-gcloud.json file by running the following command:

oc get secret gcp-credentials -n kube-system --template='{{$v := index .data "service_account.json"}}{{$v}}' | base64 -d - > decoded-gcloud.json

$ oc get secret gcp-credentials -n kube-system --template='{{$v := index .data "service_account.json"}}{{$v}}' | base64 -d - > decoded-gcloud.json

Copy to Clipboard

Export your Google credentials by running the following command:

export GOOGLE_CREDENTIALS=decoded-gcloud.json

$ export GOOGLE_CREDENTIALS=decoded-gcloud.json

Copy to Clipboard

Activate your account by using the following command:

gcloud auth activate-service-account  <client_email as per decoded-gcloud.json> --key-file=decoded-gcloud.json

$ gcloud auth activate-service-account  <client_email as per decoded-gcloud.json> --key-file=decoded-gcloud.json

Copy to Clipboard

Set your project by running the following command:

gcloud config set project <project_id as per decoded-gcloud.json>

$ gcloud config set project <project_id as per decoded-gcloud.json>

Copy to Clipboard

Get a list of routes by running the following command:

oc get routes --all-namespaces | grep console

$ oc get routes --all-namespaces | grep console

Copy to Clipboard

Example output

openshift-console          console             console-openshift-console.apps.test.gcp.example.com                       console             https   reencrypt/Redirect     None
openshift-console          downloads           downloads-openshift-console.apps.test.gcp.example.com                     downloads           http    edge/Redirect          None

openshift-console          console             console-openshift-console.apps.test.gcp.example.com                       console             https   reencrypt/Redirect     None
openshift-console          downloads           downloads-openshift-console.apps.test.gcp.example.com                     downloads           http    edge/Redirect          None

Copy to Clipboard

Get a list of managed zones by running the following command:

gcloud dns managed-zones list | grep test.gcp.example.com

$ gcloud dns managed-zones list | grep test.gcp.example.com

Copy to Clipboard

Example output

qe-cvs4g-private-zone test.gcp.example.com

qe-cvs4g-private-zone test.gcp.example.com

Copy to Clipboard

Create a YAML file, for example, external-dns-sample-gcp.yaml, that defines the ExternalDNS object:
Example external-dns-sample-gcp.yaml file
```
apiVersion: externaldns.olm.openshift.io/v1beta1
kind: ExternalDNS
metadata:
  name: sample-gcp 
spec:
  domains:
    - filterType: Include 
      matchType: Exact 
      name: test.gcp.example.com 
  provider:
    type: GCP 
  source:
    openshiftRouteOptions: 
      routerName: default 
    type: OpenShiftRoute 
```
```
apiVersion: externaldns.olm.openshift.io/v1beta1
kind: ExternalDNS
metadata:
  name: sample-gcp 
```
1
```
spec:
  domains:
    - filterType: Include 
```
2
```
      matchType: Exact 
```
3
```
      name: test.gcp.example.com 
```
4
```
  provider:
    type: GCP 
```
5
```
  source:
    openshiftRouteOptions: 
```
6
```
      routerName: default 
```
7
```
    type: OpenShiftRoute 
```
8
Copy to Clipboard
1
Specifies the External DNS name.
2
By default, all hosted zones are selected as potential targets. You can include your hosted zone.
3
The domain of the target must match the string defined by the name key.
4
Specify the exact domain of the zone you want to update. The hostname of the routes must be subdomains of the specified domain.
5
Defines the provider type.
6
You can define options for the source of DNS records.
7
If the source type is OpenShiftRoute, you can pass the OpenShift Ingress Controller name. External DNS selects the canonical hostname of that router as the target while creating CNAME record.
8
Defines the route resource as the source for GCP DNS records.

Check the DNS records created for OpenShift Container Platform routes by running the following command:

gcloud dns record-sets list --zone=qe-cvs4g-private-zone | grep console

$ gcloud dns record-sets list --zone=qe-cvs4g-private-zone | grep console

Copy to Clipboard

19.7. Creating DNS records on Infoblox

You can create DNS records on Infoblox by using the External DNS Operator.

19.7.1. Creating DNS records on a public DNS zone on Infoblox

You can create DNS records on a public DNS zone on Infoblox by using the External DNS Operator.

Prerequisites

You have access to the OpenShift CLI (oc).
You have access to the Infoblox UI.

Procedure

Create a secret object with Infoblox credentials by running the following command:

oc -n external-dns-operator create secret generic infoblox-credentials --from-literal=EXTERNAL_DNS_INFOBLOX_WAPI_USERNAME=<infoblox_username> --from-literal=EXTERNAL_DNS_INFOBLOX_WAPI_PASSWORD=<infoblox_password>

$ oc -n external-dns-operator create secret generic infoblox-credentials --from-literal=EXTERNAL_DNS_INFOBLOX_WAPI_USERNAME=<infoblox_username> --from-literal=EXTERNAL_DNS_INFOBLOX_WAPI_PASSWORD=<infoblox_password>

Copy to Clipboard

Get a list of routes by running the following command:

oc get routes --all-namespaces | grep console

$ oc get routes --all-namespaces | grep console

Copy to Clipboard

Example Output

openshift-console          console             console-openshift-console.apps.test.example.com                       console             https   reencrypt/Redirect     None
openshift-console          downloads           downloads-openshift-console.apps.test.example.com                     downloads           http    edge/Redirect          None

openshift-console          console             console-openshift-console.apps.test.example.com                       console             https   reencrypt/Redirect     None
openshift-console          downloads           downloads-openshift-console.apps.test.example.com                     downloads           http    edge/Redirect          None

Copy to Clipboard

Create a YAML file, for example, external-dns-sample-infoblox.yaml, that defines the ExternalDNS object:

Example external-dns-sample-infoblox.yaml file

apiVersion: externaldns.olm.openshift.io/v1beta1
kind: ExternalDNS
metadata:
  name: sample-infoblox 
spec:
  provider:
    type: Infoblox 
    infoblox:
      credentials:
        name: infoblox-credentials
      gridHost: ${INFOBLOX_GRID_PUBLIC_IP}
      wapiPort: 443
      wapiVersion: "2.3.1"
  domains:
  - filterType: Include
    matchType: Exact
    name: test.example.com
  source:
    type: OpenShiftRoute 
    openshiftRouteOptions:
      routerName: default

apiVersion: externaldns.olm.openshift.io/v1beta1
kind: ExternalDNS
metadata:
  name: sample-infoblox

1


spec:
  provider:
    type: Infoblox

2


    infoblox:
      credentials:
        name: infoblox-credentials
      gridHost: ${INFOBLOX_GRID_PUBLIC_IP}
      wapiPort: 443
      wapiVersion: "2.3.1"
  domains:
  - filterType: Include
    matchType: Exact
    name: test.example.com
  source:
    type: OpenShiftRoute

3


    openshiftRouteOptions:
      routerName: default

4

Copy to Clipboard

1: Specifies the External DNS name.
2: Defines the provider type.
3: You can define options for the source of DNS records.
4: If the source type is OpenShiftRoute, you can pass the OpenShift Ingress Controller name. External DNS selects the canonical hostname of that router as the target while creating CNAME record.

Create the ExternalDNS resource on Infoblox by running the following command:
```
oc create -f external-dns-sample-infoblox.yaml
```
```
$ oc create -f external-dns-sample-infoblox.yaml
```
Copy to Clipboard
From the Infoblox UI, check the DNS records created for console routes:
1. Click Data Management → DNS → Zones.
2. Select the zone name.

19.8. Configuring the cluster-wide proxy on the External DNS Operator

After configuring the cluster-wide proxy, the Operator Lifecycle Manager (OLM) triggers automatic updates to all of the deployed Operators with the new contents of the HTTP_PROXY, HTTPS_PROXY, and NO_PROXY environment variables.

19.8.1. Trusting the certificate authority of the cluster-wide proxy

You can configure the External DNS Operator to trust the certificate authority of the cluster-wide proxy.

Procedure

Create the config map to contain the CA bundle in the external-dns-operator namespace by running the following command:
```
oc -n external-dns-operator create configmap trusted-ca
```
```
$ oc -n external-dns-operator create configmap trusted-ca
```
Copy to Clipboard

To inject the trusted CA bundle into the config map, add the config.openshift.io/inject-trusted-cabundle=true label to the config map by running the following command:

oc -n external-dns-operator label cm trusted-ca config.openshift.io/inject-trusted-cabundle=true

$ oc -n external-dns-operator label cm trusted-ca config.openshift.io/inject-trusted-cabundle=true

Copy to Clipboard

Update the subscription of the External DNS Operator by running the following command:

oc -n external-dns-operator patch subscription external-dns-operator --type='json' -p='[{"op": "add", "path": "/spec/config", "value":{"env":[{"name":"TRUSTED_CA_CONFIGMAP_NAME","value":"trusted-ca"}]}}]'

$ oc -n external-dns-operator patch subscription external-dns-operator --type='json' -p='[{"op": "add", "path": "/spec/config", "value":{"env":[{"name":"TRUSTED_CA_CONFIGMAP_NAME","value":"trusted-ca"}]}}]'

Copy to Clipboard

Verification

After the deployment of the External DNS Operator is completed, verify that the trusted CA environment variable is added to the external-dns-operator deployment by running the following command:

oc -n external-dns-operator exec deploy/external-dns-operator -c external-dns-operator -- printenv TRUSTED_CA_CONFIGMAP_NAME

$ oc -n external-dns-operator exec deploy/external-dns-operator -c external-dns-operator -- printenv TRUSTED_CA_CONFIGMAP_NAME

Copy to Clipboard

Example output

trusted-ca

trusted-ca

Copy to Clipboard

Chapter 20. Network policy

20.1. About network policy

As a developer, you can define network policies that restrict traffic to pods in your cluster.

20.1.1. About network policy

In a cluster using a network plugin that supports Kubernetes network policy, network isolation is controlled entirely by NetworkPolicy objects. In OpenShift Container Platform 4.13, OpenShift SDN supports using network policy in its default network isolation mode.

Warning

A network policy does not apply to the host network namespace. Pods with host networking enabled are unaffected by network policy rules. However, pods connecting to the host-networked pods might be affected by the network policy rules.
Using the namespaceSelector field without the podSelector field set to {} will not include hostNetwork pods. You must use the podSelector set to {} with the namespaceSelector field in order to target hostNetwork pods when creating network policies.
Network policies cannot block traffic from localhost or from their resident nodes.

By default, all pods in a project are accessible from other pods and network endpoints. To isolate one or more pods in a project, you can create NetworkPolicy objects in that project to indicate the allowed incoming connections. Project administrators can create and delete NetworkPolicy objects within their own project.

If a pod is matched by selectors in one or more NetworkPolicy objects, then the pod will accept only connections that are allowed by at least one of those NetworkPolicy objects. A pod that is not selected by any NetworkPolicy objects is fully accessible.

A network policy applies to only the Transmission Control Protocol (TCP), User Datagram Protocol (UDP), Internet Control Message Protocol (ICMP), and Stream Control Transmission Protocol (SCTP) protocols. Other protocols are not affected.

The following example NetworkPolicy objects demonstrate supporting different scenarios:

Deny all traffic:

To make a project deny by default, add a NetworkPolicy object that matches all pods but accepts no traffic:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: deny-by-default
spec:
  podSelector: {}
  ingress: []

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: deny-by-default
spec:
  podSelector: {}
  ingress: []

Copy to Clipboard

Only allow connections from the OpenShift Container Platform Ingress Controller:

To make a project allow only connections from the OpenShift Container Platform Ingress Controller, add the following NetworkPolicy object.

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-openshift-ingress
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          network.openshift.io/policy-group: ingress
  podSelector: {}
  policyTypes:
  - Ingress

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-openshift-ingress
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          network.openshift.io/policy-group: ingress
  podSelector: {}
  policyTypes:
  - Ingress

Copy to Clipboard

Only accept connections from pods within a project:
Important
To allow ingress connections from hostNetwork pods in the same namespace, you need to apply the allow-from-hostnetwork policy together with the allow-same-namespace policy.
To make pods accept connections from other pods in the same project, but reject all other connections from pods in other projects, add the following NetworkPolicy object:
```
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-same-namespace
spec:
  podSelector: {}
  ingress:
  - from:
    - podSelector: {}
```
```
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-same-namespace
spec:
  podSelector: {}
  ingress:
  - from:
    - podSelector: {}
```
Copy to Clipboard

Only allow HTTP and HTTPS traffic based on pod labels:

To enable only HTTP and HTTPS access to the pods with a specific label (role=frontend in following example), add a NetworkPolicy object similar to the following:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-http-and-https
spec:
  podSelector:
    matchLabels:
      role: frontend
  ingress:
  - ports:
    - protocol: TCP
      port: 80
    - protocol: TCP
      port: 443

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-http-and-https
spec:
  podSelector:
    matchLabels:
      role: frontend
  ingress:
  - ports:
    - protocol: TCP
      port: 80
    - protocol: TCP
      port: 443

Copy to Clipboard

Accept connections by using both namespace and pod selectors:

To match network traffic by combining namespace and pod selectors, you can use a NetworkPolicy object similar to the following:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-pod-and-namespace-both
spec:
  podSelector:
    matchLabels:
      name: test-pods
  ingress:
    - from:
      - namespaceSelector:
          matchLabels:
            project: project_name
        podSelector:
          matchLabels:
            name: test-pods

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-pod-and-namespace-both
spec:
  podSelector:
    matchLabels:
      name: test-pods
  ingress:
    - from:
      - namespaceSelector:
          matchLabels:
            project: project_name
        podSelector:
          matchLabels:
            name: test-pods

Copy to Clipboard

NetworkPolicy objects are additive, which means you can combine multiple NetworkPolicy objects together to satisfy complex network requirements.

For example, for the NetworkPolicy objects defined in previous samples, you can define both allow-same-namespace and allow-http-and-https policies within the same project. Thus allowing the pods with the label role=frontend, to accept any connection allowed by each policy. That is, connections on any port from pods in the same namespace, and connections on ports 80 and 443 from pods in any namespace.

20.1.1.1. Using the allow-from-router network policy

Use the following NetworkPolicy to allow external traffic regardless of the router configuration:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-router
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          policy-group.network.openshift.io/ingress: ""
  podSelector: {}
  policyTypes:
  - Ingress

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-router
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          policy-group.network.openshift.io/ingress: ""

1


  podSelector: {}
  policyTypes:
  - Ingress

Copy to Clipboard

1: policy-group.network.openshift.io/ingress:"" label supports both OpenShift-SDN and OVN-Kubernetes.

20.1.1.2. Using the allow-from-hostnetwork network policy

Add the following allow-from-hostnetwork NetworkPolicy object to direct traffic from the host network pods.

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-hostnetwork
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          policy-group.network.openshift.io/host-network: ""
  podSelector: {}
  policyTypes:
  - Ingress

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-hostnetwork
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          policy-group.network.openshift.io/host-network: ""
  podSelector: {}
  policyTypes:
  - Ingress

Copy to Clipboard

20.1.2. Optimizations for network policy with OpenShift SDN

Use a network policy to isolate pods that are differentiated from one another by labels within a namespace.

It is inefficient to apply NetworkPolicy objects to large numbers of individual pods in a single namespace. Pod labels do not exist at the IP address level, so a network policy generates a separate Open vSwitch (OVS) flow rule for every possible link between every pod selected with a podSelector.

For example, if the spec podSelector and the ingress podSelector within a NetworkPolicy object each match 200 pods, then 40,000 (200*200) OVS flow rules are generated. This might slow down a node.

When designing your network policy, refer to the following guidelines:

Reduce the number of OVS flow rules by using namespaces to contain groups of pods that need to be isolated.
NetworkPolicy objects that select a whole namespace, by using the namespaceSelector or an empty podSelector, generate only a single OVS flow rule that matches the VXLAN virtual network ID (VNID) of the namespace.
Keep the pods that do not need to be isolated in their original namespace, and move the pods that require isolation into one or more different namespaces.
Create additional targeted cross-namespace network policies to allow the specific traffic that you do want to allow from the isolated pods.

20.1.3. Optimizations for network policy with OVN-Kubernetes network plugin

When designing your network policy, refer to the following guidelines:

For network policies with the same spec.podSelector spec, it is more efficient to use one network policy with multiple ingress or egress rules, than multiple network policies with subsets of ingress or egress rules.

Every ingress or egress rule based on the podSelector or namespaceSelector spec generates the number of OVS flows proportional to number of pods selected by network policy + number of pods selected by ingress or egress rule. Therefore, it is preferable to use the podSelector or namespaceSelector spec that can select as many pods as you need in one rule, instead of creating individual rules for every pod.

For example, the following policy contains two rules:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: test-network-policy
spec:
  podSelector: {}
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: frontend
  - from:
    - podSelector:
        matchLabels:
          role: backend

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: test-network-policy
spec:
  podSelector: {}
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: frontend
  - from:
    - podSelector:
        matchLabels:
          role: backend

Copy to Clipboard

The following policy expresses those same two rules as one:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: test-network-policy
spec:
  podSelector: {}
  ingress:
  - from:
    - podSelector:
        matchExpressions:
        - {key: role, operator: In, values: [frontend, backend]}

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: test-network-policy
spec:
  podSelector: {}
  ingress:
  - from:
    - podSelector:
        matchExpressions:
        - {key: role, operator: In, values: [frontend, backend]}

Copy to Clipboard

The same guideline applies to the spec.podSelector spec. If you have the same ingress or egress rules for different network policies, it might be more efficient to create one network policy with a common spec.podSelector spec. For example, the following two policies have different rules:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: policy1
spec:
  podSelector:
    matchLabels:
      role: db
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: frontend
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: policy2
spec:
  podSelector:
    matchLabels:
      role: client
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: frontend

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: policy1
spec:
  podSelector:
    matchLabels:
      role: db
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: frontend
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: policy2
spec:
  podSelector:
    matchLabels:
      role: client
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: frontend

Copy to Clipboard

The following network policy expresses those same two rules as one:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: policy3
spec:
  podSelector:
    matchExpressions:
    - {key: role, operator: In, values: [db, client]}
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: frontend

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: policy3
spec:
  podSelector:
    matchExpressions:
    - {key: role, operator: In, values: [db, client]}
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: frontend

Copy to Clipboard

You can apply this optimization when only multiple selectors are expressed as one. In cases where selectors are based on different labels, it may not be possible to apply this optimization. In those cases, consider applying some new labels for network policy optimization specifically.

20.1.3.1. NetworkPolicy CR and external IPs in OVN-Kubernetes

In OVN-Kubernetes, the NetworkPolicy custom resource (CR) enforces strict isolation rules. If a service is exposed using an external IP, a network policy can block access from other namespaces unless explicitly configured to allow traffic.

To allow access to external IPs across namespaces, create a NetworkPolicy CR that explicitly permits ingress from the required namespaces and ensures traffic is allowed to the designated service ports. Without allowing traffic to the required ports, access might still be restricted.

Example output

  apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    annotations:
    name: <policy_name>
    namespace: openshift-ingress
  spec:
    ingress:
    - ports:
      - port: 80
        protocol: TCP
    - ports:
      - port: 443
        protocol: TCP
    - from:
      - namespaceSelector:
          matchLabels:
          kubernetes.io/metadata.name: <my_namespace>
    podSelector: {}
    policyTypes:
    - Ingress

  apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    annotations:
    name: <policy_name>
    namespace: openshift-ingress
  spec:
    ingress:
    - ports:
      - port: 80
        protocol: TCP
    - ports:
      - port: 443
        protocol: TCP
    - from:
      - namespaceSelector:
          matchLabels:
          kubernetes.io/metadata.name: <my_namespace>
    podSelector: {}
    policyTypes:
    - Ingress

Copy to Clipboard

where:

<policy_name>: Specifies your name for the policy.
<my_namespace>: Specifies the name of the namespace where the policy is deployed.

For more details, see "About network policy".

20.1.4. Next steps

Creating a network policy
Optional: Defining a default network policy

20.2. Creating a network policy

As a user with the admin role, you can create a network policy for a namespace.

20.2.1. Example NetworkPolicy object

The following annotates an example NetworkPolicy object:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-27107 
spec:
  podSelector: 
    matchLabels:
      app: mongodb
  ingress:
  - from:
    - podSelector: 
        matchLabels:
          app: app
    ports: 
    - protocol: TCP
      port: 27017

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-27107

1


spec:
  podSelector:

2


    matchLabels:
      app: mongodb
  ingress:
  - from:
    - podSelector:

3


        matchLabels:
          app: app
    ports:

4


    - protocol: TCP
      port: 27017

Copy to Clipboard

1: The name of the NetworkPolicy object.
2: A selector that describes the pods to which the policy applies. The policy object can only select pods in the project that defines the NetworkPolicy object.
3: A selector that matches the pods from which the policy object allows ingress traffic. The selector matches pods in the same namespace as the NetworkPolicy.
4: A list of one or more destination ports on which to accept traffic.

20.2.2. Creating a network policy using the CLI

To define granular rules describing ingress or egress network traffic allowed for namespaces in your cluster, you can create a network policy.

Note

If you log in with a user with the cluster-admin role, then you can create a network policy in any namespace in the cluster.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with admin privileges.
You are working in the namespace that the network policy applies to.

Procedure

Create a policy rule:

Create a <policy_name>.yaml file:
```
touch <policy_name>.yaml
```
```
$ touch <policy_name>.yaml
```
Copy to Clipboard
where:
<policy_name>
Specifies the network policy file name.

Define a network policy in the file that you just created, such as in the following examples:

Deny ingress from all pods in all namespaces

This is a fundamental policy, blocking all cross-pod networking other than cross-pod traffic allowed by the configuration of other Network Policies.

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: deny-by-default
spec:
  podSelector:
  ingress: []

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: deny-by-default
spec:
  podSelector:
  ingress: []

Copy to Clipboard

Allow ingress from all pods in the same namespace

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-same-namespace
spec:
  podSelector:
  ingress:
  - from:
    - podSelector: {}

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-same-namespace
spec:
  podSelector:
  ingress:
  - from:
    - podSelector: {}

Copy to Clipboard

Allow ingress traffic to one pod from a particular namespace

This policy allows traffic to pods labelled pod-a from pods running in namespace-y.

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-traffic-pod
spec:
  podSelector:
   matchLabels:
      pod: pod-a
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
           kubernetes.io/metadata.name: namespace-y

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-traffic-pod
spec:
  podSelector:
   matchLabels:
      pod: pod-a
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
           kubernetes.io/metadata.name: namespace-y

Copy to Clipboard

To create the network policy object, enter the following command:
```
oc apply -f <policy_name>.yaml -n <namespace>
```
```
$ oc apply -f <policy_name>.yaml -n <namespace>
```
Copy to Clipboard
where:
<policy_name>
Specifies the network policy file name.
<namespace>
Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
Example output
```
networkpolicy.networking.k8s.io/deny-by-default created
```
```
networkpolicy.networking.k8s.io/deny-by-default created
```
Copy to Clipboard

Note

If you log in to the web console with cluster-admin privileges, you have a choice of creating a network policy in any namespace in the cluster directly in YAML or from a form in the web console.

20.2.3. Creating a default deny all network policy

This is a fundamental policy, blocking all cross-pod networking other than network traffic allowed by the configuration of other deployed network policies. This procedure enforces a default deny-by-default policy.

Note

If you log in with a user with the cluster-admin role, then you can create a network policy in any namespace in the cluster.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with admin privileges.
You are working in the namespace that the network policy applies to.

Procedure

Create the following YAML that defines a deny-by-default policy to deny ingress from all pods in all namespaces. Save the YAML in the deny-by-default.yaml file:
```
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: deny-by-default
  namespace: default 
spec:
  podSelector: {} 
  ingress: [] 
```
```
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: deny-by-default
  namespace: default 
```
1
```
spec:
  podSelector: {} 
```
2
```
  ingress: [] 
```
3
Copy to Clipboard
1
namespace: default deploys this policy to the default namespace.
2
podSelector: is empty, this means it matches all the pods. Therefore, the policy applies to all pods in the default namespace.
3
There are no ingress rules specified. This causes incoming traffic to be dropped to all pods.

Apply the policy by entering the following command:

oc apply -f deny-by-default.yaml

$ oc apply -f deny-by-default.yaml

Copy to Clipboard

Example output

networkpolicy.networking.k8s.io/deny-by-default created

networkpolicy.networking.k8s.io/deny-by-default created

Copy to Clipboard

20.2.4. Creating a network policy to allow traffic from external clients

With the deny-by-default policy in place you can proceed to configure a policy that allows traffic from external clients to a pod with the label app=web.

Note

If you log in with a user with the cluster-admin role, then you can create a network policy in any namespace in the cluster.

Follow this procedure to configure a policy that allows external service from the public Internet directly or by using a Load Balancer to access the pod. Traffic is only allowed to a pod with the label app=web.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with admin privileges.
You are working in the namespace that the network policy applies to.

Procedure

Create a policy that allows traffic from the public Internet directly or by using a load balancer to access the pod. Save the YAML in the web-allow-external.yaml file:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: web-allow-external
  namespace: default
spec:
  policyTypes:
  - Ingress
  podSelector:
    matchLabels:
      app: web
  ingress:
    - {}

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: web-allow-external
  namespace: default
spec:
  policyTypes:
  - Ingress
  podSelector:
    matchLabels:
      app: web
  ingress:
    - {}

Copy to Clipboard

Apply the policy by entering the following command:

oc apply -f web-allow-external.yaml

$ oc apply -f web-allow-external.yaml

Copy to Clipboard

Example output

networkpolicy.networking.k8s.io/web-allow-external created

networkpolicy.networking.k8s.io/web-allow-external created

Copy to Clipboard

This policy allows traffic from all resources, including external traffic as illustrated in the following diagram:

20.2.5. Creating a network policy allowing traffic to an application from all namespaces

Note

If you log in with a user with the cluster-admin role, then you can create a network policy in any namespace in the cluster.

Follow this procedure to configure a policy that allows traffic from all pods in all namespaces to a particular application.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with admin privileges.
You are working in the namespace that the network policy applies to.

Procedure

Create a policy that allows traffic from all pods in all namespaces to a particular application. Save the YAML in the web-allow-all-namespaces.yaml file:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: web-allow-all-namespaces
  namespace: default
spec:
  podSelector:
    matchLabels:
      app: web 
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector: {}

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: web-allow-all-namespaces
  namespace: default
spec:
  podSelector:
    matchLabels:
      app: web

1


  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector: {}

2

Copy to Clipboard

1: Applies the policy only to app:web pods in default namespace.
2: Selects all pods in all namespaces.

Note

By default, if you omit specifying a namespaceSelector it does not select any namespaces, which means the policy allows traffic only from the namespace the network policy is deployed to.

Apply the policy by entering the following command:

oc apply -f web-allow-all-namespaces.yaml

$ oc apply -f web-allow-all-namespaces.yaml

Copy to Clipboard

Example output

networkpolicy.networking.k8s.io/web-allow-all-namespaces created

networkpolicy.networking.k8s.io/web-allow-all-namespaces created

Copy to Clipboard

Verification

Start a web service in the default namespace by entering the following command:

oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

$ oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

Copy to Clipboard

Run the following command to deploy an alpine image in the secondary namespace and to start a shell:

oc run test-$RANDOM --namespace=secondary --rm -i -t --image=alpine -- sh

$ oc run test-$RANDOM --namespace=secondary --rm -i -t --image=alpine -- sh

Copy to Clipboard

Run the following command in the shell and observe that the request is allowed:

wget -qO- --timeout=2 http://web.default

# wget -qO- --timeout=2 http://web.default

Copy to Clipboard

Expected output

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

Copy to Clipboard

20.2.6. Creating a network policy allowing traffic to an application from a namespace

Note

If you log in with a user with the cluster-admin role, then you can create a network policy in any namespace in the cluster.

Follow this procedure to configure a policy that allows traffic to a pod with the label app=web from a particular namespace. You might want to do this to:

Restrict traffic to a production database only to namespaces where production workloads are deployed.
Enable monitoring tools deployed to a particular namespace to scrape metrics from the current namespace.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with admin privileges.
You are working in the namespace that the network policy applies to.

Procedure

Create a policy that allows traffic from all pods in a particular namespaces with a label purpose=production. Save the YAML in the web-allow-prod.yaml file:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: web-allow-prod
  namespace: default
spec:
  podSelector:
    matchLabels:
      app: web 
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          purpose: production

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: web-allow-prod
  namespace: default
spec:
  podSelector:
    matchLabels:
      app: web

1


  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          purpose: production

2

Copy to Clipboard

1: Applies the policy only to app:web pods in the default namespace.
2: Restricts traffic to only pods in namespaces that have the label purpose=production.

Apply the policy by entering the following command:

oc apply -f web-allow-prod.yaml

$ oc apply -f web-allow-prod.yaml

Copy to Clipboard

Example output

networkpolicy.networking.k8s.io/web-allow-prod created

networkpolicy.networking.k8s.io/web-allow-prod created

Copy to Clipboard

Verification

Start a web service in the default namespace by entering the following command:

oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

$ oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

Copy to Clipboard

Run the following command to create the prod namespace:
```
oc create namespace prod
```
```
$ oc create namespace prod
```
Copy to Clipboard

Run the following command to label the prod namespace:

oc label namespace/prod purpose=production

$ oc label namespace/prod purpose=production

Copy to Clipboard

Run the following command to create the dev namespace:
```
oc create namespace dev
```
```
$ oc create namespace dev
```
Copy to Clipboard

Run the following command to label the dev namespace:

oc label namespace/dev purpose=testing

$ oc label namespace/dev purpose=testing

Copy to Clipboard

Run the following command to deploy an alpine image in the dev namespace and to start a shell:

oc run test-$RANDOM --namespace=dev --rm -i -t --image=alpine -- sh

$ oc run test-$RANDOM --namespace=dev --rm -i -t --image=alpine -- sh

Copy to Clipboard

Run the following command in the shell and observe that the request is blocked:
```
wget -qO- --timeout=2 http://web.default
```
```
# wget -qO- --timeout=2 http://web.default
```
Copy to Clipboard
Expected output
```
wget: download timed out
```
```
wget: download timed out
```
Copy to Clipboard

Run the following command to deploy an alpine image in the prod namespace and start a shell:

oc run test-$RANDOM --namespace=prod --rm -i -t --image=alpine -- sh

$ oc run test-$RANDOM --namespace=prod --rm -i -t --image=alpine -- sh

Copy to Clipboard

Run the following command in the shell and observe that the request is allowed:

wget -qO- --timeout=2 http://web.default

# wget -qO- --timeout=2 http://web.default

Copy to Clipboard

Expected output

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

Copy to Clipboard

20.3. Viewing a network policy

As a user with the admin role, you can view a network policy for a namespace.

20.3.1. Example NetworkPolicy object

The following annotates an example NetworkPolicy object:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-27107 
spec:
  podSelector: 
    matchLabels:
      app: mongodb
  ingress:
  - from:
    - podSelector: 
        matchLabels:
          app: app
    ports: 
    - protocol: TCP
      port: 27017

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-27107

1


spec:
  podSelector:

2


    matchLabels:
      app: mongodb
  ingress:
  - from:
    - podSelector:

3


        matchLabels:
          app: app
    ports:

4


    - protocol: TCP
      port: 27017

Copy to Clipboard

1: The name of the NetworkPolicy object.
2: A selector that describes the pods to which the policy applies. The policy object can only select pods in the project that defines the NetworkPolicy object.
3: A selector that matches the pods from which the policy object allows ingress traffic. The selector matches pods in the same namespace as the NetworkPolicy.
4: A list of one or more destination ports on which to accept traffic.

20.3.2. Viewing network policies using the CLI

You can examine the network policies in a namespace.

Note

If you log in with a user with the cluster-admin role, then you can view any network policy in the cluster.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with admin privileges.
You are working in the namespace where the network policy exists.

Procedure

List network policies in a namespace:

To view network policy objects defined in a namespace, enter the following command:
```
oc get networkpolicy
```
```
$ oc get networkpolicy
```
Copy to Clipboard

Optional: To examine a specific network policy, enter the following command:

oc describe networkpolicy <policy_name> -n <namespace>

$ oc describe networkpolicy <policy_name> -n <namespace>

Copy to Clipboard

where:

<policy_name>: Specifies the name of the network policy to inspect.
<namespace>: Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

For example:

oc describe networkpolicy allow-same-namespace

$ oc describe networkpolicy allow-same-namespace

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Output for oc describe command

Name:         allow-same-namespace
Namespace:    ns1
Created on:   2021-05-24 22:28:56 -0400 EDT
Labels:       <none>
Annotations:  <none>
Spec:
  PodSelector:     <none> (Allowing the specific traffic to all pods in this namespace)
  Allowing ingress traffic:
    To Port: <any> (traffic allowed to all ports)
    From:
      PodSelector: <none>
  Not affecting egress traffic
  Policy Types: Ingress

Name:         allow-same-namespace
Namespace:    ns1
Created on:   2021-05-24 22:28:56 -0400 EDT
Labels:       <none>
Annotations:  <none>
Spec:
  PodSelector:     <none> (Allowing the specific traffic to all pods in this namespace)
  Allowing ingress traffic:
    To Port: <any> (traffic allowed to all ports)
    From:
      PodSelector: <none>
  Not affecting egress traffic
  Policy Types: Ingress

Copy to Clipboard

Note

If you log in to the web console with cluster-admin privileges, you have a choice of viewing a network policy in any namespace in the cluster directly in YAML or from a form in the web console.

20.4. Editing a network policy

As a user with the admin role, you can edit an existing network policy for a namespace.

20.4.1. Editing a network policy

You can edit a network policy in a namespace.

Note

If you log in with a user with the cluster-admin role, then you can edit a network policy in any namespace in the cluster.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with admin privileges.
You are working in the namespace where the network policy exists.

Procedure

Optional: To list the network policy objects in a namespace, enter the following command:
```
oc get networkpolicy
```
```
$ oc get networkpolicy
```
Copy to Clipboard
where:
<namespace>
Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
Edit the network policy object.
- If you saved the network policy definition in a file, edit the file and make any necessary changes, and then enter the following command.
  $ oc apply -n <namespace> -f <policy_file>.yaml
  Copy to Clipboard
  where:
  <namespace>
  Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
  <policy_file>
  Specifies the name of the file containing the network policy.
- If you need to update the network policy object directly, enter the following command:
  $ oc edit networkpolicy <policy_name> -n <namespace>
  Copy to Clipboard
  where:
  <policy_name>
  Specifies the name of the network policy.
  <namespace>
  Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
Confirm that the network policy object is updated.
```
oc describe networkpolicy <policy_name> -n <namespace>
```
```
$ oc describe networkpolicy <policy_name> -n <namespace>
```
Copy to Clipboard
where:
<policy_name>
Specifies the name of the network policy.
<namespace>
Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

Note

If you log in to the web console with cluster-admin privileges, you have a choice of editing a network policy in any namespace in the cluster directly in YAML or from the policy in the web console through the Actions menu.

20.4.2. Example NetworkPolicy object

The following annotates an example NetworkPolicy object:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-27107 
spec:
  podSelector: 
    matchLabels:
      app: mongodb
  ingress:
  - from:
    - podSelector: 
        matchLabels:
          app: app
    ports: 
    - protocol: TCP
      port: 27017

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-27107

1


spec:
  podSelector:

2


    matchLabels:
      app: mongodb
  ingress:
  - from:
    - podSelector:

3


        matchLabels:
          app: app
    ports:

4


    - protocol: TCP
      port: 27017

Copy to Clipboard

1: The name of the NetworkPolicy object.
2: A selector that describes the pods to which the policy applies. The policy object can only select pods in the project that defines the NetworkPolicy object.
3: A selector that matches the pods from which the policy object allows ingress traffic. The selector matches pods in the same namespace as the NetworkPolicy.
4: A list of one or more destination ports on which to accept traffic.

20.5. Deleting a network policy

As a user with the admin role, you can delete a network policy from a namespace.

20.5.1. Deleting a network policy using the CLI

You can delete a network policy in a namespace.

Note

If you log in with a user with the cluster-admin role, then you can delete any network policy in the cluster.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with admin privileges.
You are working in the namespace where the network policy exists.

Procedure

To delete a network policy object, enter the following command:
```
oc delete networkpolicy <policy_name> -n <namespace>
```
```
$ oc delete networkpolicy <policy_name> -n <namespace>
```
Copy to Clipboard
where:
<policy_name>
Specifies the name of the network policy.
<namespace>
Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
Example output
```
networkpolicy.networking.k8s.io/default-deny deleted
```
```
networkpolicy.networking.k8s.io/default-deny deleted
```
Copy to Clipboard

Note

If you log in to the web console with cluster-admin privileges, you have a choice of deleting a network policy in any namespace in the cluster directly in YAML or from the policy in the web console through the Actions menu.

20.6. Defining a default network policy for projects

As a cluster administrator, you can modify the new project template to automatically include network policies when you create a new project. If you do not yet have a customized template for new projects, you must first create one.

20.6.1. Modifying the template for new projects

As a cluster administrator, you can modify the default project template so that new projects are created using your custom requirements.

To create your own custom project template:

Procedure

Log in as a user with cluster-admin privileges.

Generate the default project template:

oc adm create-bootstrap-project-template -o yaml > template.yaml

$ oc adm create-bootstrap-project-template -o yaml > template.yaml

Copy to Clipboard

Use a text editor to modify the generated template.yaml file by adding objects or modifying existing objects.
The project template must be created in the openshift-config namespace. Load your modified template:
```
oc create -f template.yaml -n openshift-config
```
```
$ oc create -f template.yaml -n openshift-config
```
Copy to Clipboard
Edit the project configuration resource using the web console or CLI.
- Using the web console:
  1. Navigate to the Administration → Cluster Settings page.
  2. Click Configuration to view all configuration resources.
  3. Find the entry for Project and click Edit YAML.
- Using the CLI:
  1. Edit the project.config.openshift.io/cluster resource:
    
    $ oc edit project.config.openshift.io/cluster
    
    Copy to Clipboard

Update the spec section to include the projectRequestTemplate and name parameters, and set the name of your uploaded project template. The default name is project-request.

Project configuration resource with custom project template

apiVersion: config.openshift.io/v1
kind: Project
metadata:
# ...
spec:
  projectRequestTemplate:
    name: <template_name>
# ...

apiVersion: config.openshift.io/v1
kind: Project
metadata:
# ...
spec:
  projectRequestTemplate:
    name: <template_name>
# ...

Copy to Clipboard

After you save your changes, create a new project to verify that your changes were successfully applied.

20.6.2. Adding network policies to the new project template

As a cluster administrator, you can add network policies to the default template for new projects. OpenShift Container Platform will automatically create all the NetworkPolicy objects specified in the template in the project.

Prerequisites

Your cluster uses a default CNI network plugin that supports NetworkPolicy objects, such as the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You must log in to the cluster with a user with cluster-admin privileges.
You must have created a custom default project template for new projects.

Procedure

Edit the default template for a new project by running the following command:
```
oc edit template <project_template> -n openshift-config
```
```
$ oc edit template <project_template> -n openshift-config
```
Copy to Clipboard
Replace <project_template> with the name of the default template that you configured for your cluster. The default template name is project-request.

In the template, add each NetworkPolicy object as an element to the objects parameter. The objects parameter accepts a collection of one or more objects.

In the following example, the objects parameter collection includes several NetworkPolicy objects.

objects:
- apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    name: allow-from-same-namespace
  spec:
    podSelector: {}
    ingress:
    - from:
      - podSelector: {}
- apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    name: allow-from-openshift-ingress
  spec:
    ingress:
    - from:
      - namespaceSelector:
          matchLabels:
            network.openshift.io/policy-group: ingress
    podSelector: {}
    policyTypes:
    - Ingress
- apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    name: allow-from-kube-apiserver-operator
  spec:
    ingress:
    - from:
      - namespaceSelector:
          matchLabels:
            kubernetes.io/metadata.name: openshift-kube-apiserver-operator
        podSelector:
          matchLabels:
            app: kube-apiserver-operator
    policyTypes:
    - Ingress
...

objects:
- apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    name: allow-from-same-namespace
  spec:
    podSelector: {}
    ingress:
    - from:
      - podSelector: {}
- apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    name: allow-from-openshift-ingress
  spec:
    ingress:
    - from:
      - namespaceSelector:
          matchLabels:
            network.openshift.io/policy-group: ingress
    podSelector: {}
    policyTypes:
    - Ingress
- apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    name: allow-from-kube-apiserver-operator
  spec:
    ingress:
    - from:
      - namespaceSelector:
          matchLabels:
            kubernetes.io/metadata.name: openshift-kube-apiserver-operator
        podSelector:
          matchLabels:
            app: kube-apiserver-operator
    policyTypes:
    - Ingress
...

Copy to Clipboard

Optional: Create a new project to confirm that your network policy objects are created successfully by running the following commands:
1. Create a new project:
  $ oc new-project <project>
  1
  Copy to Clipboard
  1
  Replace <project> with the name for the project you are creating.
2. Confirm that the network policy objects in the new project template exist in the new project:
  $ oc get networkpolicy NAME POD-SELECTOR AGE allow-from-openshift-ingress <none> 7s allow-from-same-namespace <none> 7s
  Copy to Clipboard

20.7. Configuring multitenant isolation with network policy

As a cluster administrator, you can configure your network policies to provide multitenant network isolation.

Note

If you are using the OpenShift SDN network plugin, configuring network policies as described in this section provides network isolation similar to multitenant mode but with network policy mode set.

20.7.1. Configuring multitenant isolation by using network policy

You can configure your project to isolate it from pods and services in other project namespaces.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with admin privileges.

Procedure

Create the following NetworkPolicy objects:

A policy named allow-from-openshift-ingress.

cat << EOF| oc create -f -
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-openshift-ingress
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          policy-group.network.openshift.io/ingress: ""
  podSelector: {}
  policyTypes:
  - Ingress
EOF

$ cat << EOF| oc create -f -
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-openshift-ingress
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          policy-group.network.openshift.io/ingress: ""
  podSelector: {}
  policyTypes:
  - Ingress
EOF

Copy to Clipboard

Note

policy-group.network.openshift.io/ingress: "" is the preferred namespace selector label for OpenShift SDN. You can use the network.openshift.io/policy-group: ingress namespace selector label, but this is a legacy label.

A policy named allow-from-openshift-monitoring:

cat << EOF| oc create -f -
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-openshift-monitoring
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          network.openshift.io/policy-group: monitoring
  podSelector: {}
  policyTypes:
  - Ingress
EOF

$ cat << EOF| oc create -f -
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-openshift-monitoring
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          network.openshift.io/policy-group: monitoring
  podSelector: {}
  policyTypes:
  - Ingress
EOF

Copy to Clipboard

A policy named allow-same-namespace:

cat << EOF| oc create -f -
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-same-namespace
spec:
  podSelector:
  ingress:
  - from:
    - podSelector: {}
EOF

$ cat << EOF| oc create -f -
kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: allow-same-namespace
spec:
  podSelector:
  ingress:
  - from:
    - podSelector: {}
EOF

Copy to Clipboard

A policy named allow-from-kube-apiserver-operator:

cat << EOF| oc create -f -
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-kube-apiserver-operator
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: openshift-kube-apiserver-operator
      podSelector:
        matchLabels:
          app: kube-apiserver-operator
  policyTypes:
  - Ingress
EOF

$ cat << EOF| oc create -f -
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-kube-apiserver-operator
spec:
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          kubernetes.io/metadata.name: openshift-kube-apiserver-operator
      podSelector:
        matchLabels:
          app: kube-apiserver-operator
  policyTypes:
  - Ingress
EOF

Copy to Clipboard

For more details, see New kube-apiserver-operator webhook controller validating health of webhook.

Optional: To confirm that the network policies exist in your current project, enter the following command:

oc describe networkpolicy

$ oc describe networkpolicy

Copy to Clipboard

Example output

Name:         allow-from-openshift-ingress
Namespace:    example1
Created on:   2020-06-09 00:28:17 -0400 EDT
Labels:       <none>
Annotations:  <none>
Spec:
  PodSelector:     <none> (Allowing the specific traffic to all pods in this namespace)
  Allowing ingress traffic:
    To Port: <any> (traffic allowed to all ports)
    From:
      NamespaceSelector: network.openshift.io/policy-group: ingress
  Not affecting egress traffic
  Policy Types: Ingress


Name:         allow-from-openshift-monitoring
Namespace:    example1
Created on:   2020-06-09 00:29:57 -0400 EDT
Labels:       <none>
Annotations:  <none>
Spec:
  PodSelector:     <none> (Allowing the specific traffic to all pods in this namespace)
  Allowing ingress traffic:
    To Port: <any> (traffic allowed to all ports)
    From:
      NamespaceSelector: network.openshift.io/policy-group: monitoring
  Not affecting egress traffic
  Policy Types: Ingress

Name:         allow-from-openshift-ingress
Namespace:    example1
Created on:   2020-06-09 00:28:17 -0400 EDT
Labels:       <none>
Annotations:  <none>
Spec:
  PodSelector:     <none> (Allowing the specific traffic to all pods in this namespace)
  Allowing ingress traffic:
    To Port: <any> (traffic allowed to all ports)
    From:
      NamespaceSelector: network.openshift.io/policy-group: ingress
  Not affecting egress traffic
  Policy Types: Ingress


Name:         allow-from-openshift-monitoring
Namespace:    example1
Created on:   2020-06-09 00:29:57 -0400 EDT
Labels:       <none>
Annotations:  <none>
Spec:
  PodSelector:     <none> (Allowing the specific traffic to all pods in this namespace)
  Allowing ingress traffic:
    To Port: <any> (traffic allowed to all ports)
    From:
      NamespaceSelector: network.openshift.io/policy-group: monitoring
  Not affecting egress traffic
  Policy Types: Ingress

Copy to Clipboard

20.7.2. Next steps

Defining a default network policy

Chapter 21. CIDR range definitions

You must specify non-overlapping ranges for the following CIDR ranges.

Note

Machine CIDR ranges cannot be changed after creating your cluster.

Important

OVN-Kubernetes, the default network provider in OpenShift Container Platform 4.11 to 4.13, uses the following IP address ranges internally: 100.64.0.0/16, 169.254.169.0/29, fd98::/64 and fd69::/125. If your cluster uses OVN-Kubernetes, do not include any IP address ranges in any other CIDR definitions in your cluster.

21.1. Machine CIDR

In the Machine classless inter-domain routing (CIDR) field, you must specify the IP address range for machines or cluster nodes.

The default is 10.0.0.0/16. This range must not conflict with any connected networks.

21.2. Service CIDR

In the Service CIDR field, you must specify the IP address range for services. The range must be large enough to accommodate your workload. The address block must not overlap with any external service accessed from within the cluster. The default is 172.30.0.0/16.

21.3. Pod CIDR

In the pod CIDR field, you must specify the IP address range for pods.

The pod CIDR is the same as the clusterNetwork CIDR and the cluster CIDR. The range must be large enough to accommodate your workload. The address block must not overlap with any external service accessed from within the cluster. The default is 10.128.0.0/14. You can expand the range after cluster installation.

21.4. Host Prefix

In the Host Prefix field, you must specify the subnet prefix length assigned to pods scheduled to individual machines. The host prefix determines the pod IP address pool for each machine.

For example, if the host prefix is set to /23, each machine is assigned a /23 subnet from the pod CIDR address range. The default is /23, allowing 510 cluster nodes, and 510 pod IP addresses per node.

Chapter 22. AWS Load Balancer Operator

22.1. AWS Load Balancer Operator release notes

The AWS Load Balancer (ALB) Operator deploys and manages an instance of the AWSLoadBalancerController resource.

Important

The AWS Load Balancer (ALB) Operator is only supported on the x86_64 architecture.

These release notes track the development of the AWS Load Balancer Operator in OpenShift Container Platform.

For an overview of the AWS Load Balancer Operator, see AWS Load Balancer Operator in OpenShift Container Platform.

Note

AWS Load Balancer Operator currently does not support AWS GovCloud.

22.1.1. AWS Load Balancer Operator 1.0.0

The AWS Load Balancer Operator is now generally available with this release. The AWS Load Balancer Operator version 1.0.0 supports the AWS Load Balancer Controller version 2.4.4.

The following advisory is available for the AWS Load Balancer Operator version 1.0.0:

RHEA-2023:1954 Release of AWS Load Balancer Operator on OperatorHub Enhancement Advisory Update

22.1.1.1. Notable changes

This release uses the new v1 API version.

22.1.1.2. Bug fixes

Previously, the controller provisioned by the AWS Load Balancer Operator did not properly use the configuration for the cluster-wide proxy. These settings are now applied appropriately to the controller. (OCPBUGS-4052, OCPBUGS-5295)

22.1.2. Earlier versions

The two earliest versions of the AWS Load Balancer Operator are available as a Technology Preview. These versions should not be used in a production cluster. For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

The following advisory is available for the AWS Load Balancer Operator version 0.2.0:

RHEA-2022:9084 Release of AWS Load Balancer Operator on OperatorHub Enhancement Advisory Update

The following advisory is available for the AWS Load Balancer Operator version 0.0.1:

RHEA-2022:5780 Release of AWS Load Balancer Operator on OperatorHub Enhancement Advisory Update

22.2. AWS Load Balancer Operator in OpenShift Container Platform

The AWS Load Balancer Operator deploys and manages the AWS Load Balancer Controller. You can install the AWS Load Balancer Operator from OperatorHub by using OpenShift Container Platform web console or CLI.

22.2.1. AWS Load Balancer Operator considerations

Review the following limitations before installing and using the AWS Load Balancer Operator:

The IP traffic mode only works on AWS Elastic Kubernetes Service (EKS). The AWS Load Balancer Operator disables the IP traffic mode for the AWS Load Balancer Controller. As a result of disabling the IP traffic mode, the AWS Load Balancer Controller cannot use the pod readiness gate.
The AWS Load Balancer Operator adds command-line flags such as --disable-ingress-class-annotation and --disable-ingress-group-name-annotation to the AWS Load Balancer Controller. Therefore, the AWS Load Balancer Operator does not allow using the kubernetes.io/ingress.class and alb.ingress.kubernetes.io/group.name annotations in the Ingress resource.
You have configured the AWS Load Balancer Operator so that the SVC type is NodePort (not LoadBalancer or ClusterIP).

22.2.2. AWS Load Balancer Operator

The AWS Load Balancer Operator can tag the public subnets if the kubernetes.io/role/elb tag is missing. Also, the AWS Load Balancer Operator detects the following information from the underlying AWS cloud:

The ID of the virtual private cloud (VPC) on which the cluster hosting the Operator is deployed in.
Public and private subnets of the discovered VPC.

The AWS Load Balancer Operator supports the Kubernetes service resource of type LoadBalancer by using Network Load Balancer (NLB) with the instance target type only.

Prerequisites

You must have the AWS credentials secret. The credentials are used to provide subnet tagging and VPC discovery.

Procedure

You can deploy the AWS Load Balancer Operator on demand from OperatorHub, by creating a Subscription object by running the following command:

oc -n aws-load-balancer-operator get sub aws-load-balancer-operator --template='{{.status.installplan.name}}{{"\n"}}'

$ oc -n aws-load-balancer-operator get sub aws-load-balancer-operator --template='{{.status.installplan.name}}{{"\n"}}'

Copy to Clipboard

Example output

install-zlfbt

install-zlfbt

Copy to Clipboard

Check if the status of an install plan is Complete by running the following command:

oc -n aws-load-balancer-operator get ip <install_plan_name> --template='{{.status.phase}}{{"\n"}}'

$ oc -n aws-load-balancer-operator get ip <install_plan_name> --template='{{.status.phase}}{{"\n"}}'

Copy to Clipboard

Example output

Complete

Complete

Copy to Clipboard

View the status of the aws-load-balancer-operator-controller-manager deployment by running the following command:

oc get -n aws-load-balancer-operator deployment/aws-load-balancer-operator-controller-manager

$ oc get -n aws-load-balancer-operator deployment/aws-load-balancer-operator-controller-manager

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Example output

NAME                                           READY     UP-TO-DATE   AVAILABLE   AGE
aws-load-balancer-operator-controller-manager  1/1       1            1           23h

NAME                                           READY     UP-TO-DATE   AVAILABLE   AGE
aws-load-balancer-operator-controller-manager  1/1       1            1           23h

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22.2.3. AWS Load Balancer Operator logs

You can view the AWS Load Balancer Operator logs by using the oc logs command.

Procedure

View the logs of the AWS Load Balancer Operator by running the following command:

oc logs -n aws-load-balancer-operator deployment/aws-load-balancer-operator-controller-manager -c manager

$ oc logs -n aws-load-balancer-operator deployment/aws-load-balancer-operator-controller-manager -c manager

Copy to Clipboard

22.3. Installing the AWS Load Balancer Operator

The AWS Load Balancer Operator deploys and manages the AWS Load Balancer Controller. You can install the AWS Load Balancer Operator from the OperatorHub by using OpenShift Container Platform web console or CLI.

22.3.1. Installing the AWS Load Balancer Operator by using the web console

You can install the AWS Load Balancer Operator by using the web console.

Prerequisites

You have logged in to the OpenShift Container Platform web console as a user with cluster-admin permissions.
Your cluster is configured with AWS as the platform type and cloud provider.
If you are using a security token service (STS) or user-provisioned infrastructure, follow the related preparation steps. For example, if you are using AWS Security Token Service, see "Preparing for the AWS Load Balancer Operator on a cluster using the AWS Security Token Service (STS)".

Procedure

Navigate to Operators → OperatorHub in the OpenShift Container Platform web console.
Select the AWS Load Balancer Operator. You can use the Filter by keyword text box or use the filter list to search for the AWS Load Balancer Operator from the list of Operators.
Select the aws-load-balancer-operator namespace.
On the Install Operator page, select the following options:
1. Update the channel as stable-v1.
2. Installation mode as All namespaces on the cluster (default).
3. Installed Namespace as aws-load-balancer-operator. If the aws-load-balancer-operator namespace does not exist, it gets created during the Operator installation.
4. Select Update approval as Automatic or Manual. By default, the Update approval is set to Automatic. If you select automatic updates, the Operator Lifecycle Manager (OLM) automatically upgrades the running instance of your Operator without any intervention. If you select manual updates, the OLM creates an update request. As a cluster administrator, you must then manually approve that update request to update the Operator updated to the new version.
Click Install.

Verification

Verify that the AWS Load Balancer Operator shows the Status as Succeeded on the Installed Operators dashboard.

22.3.2. Installing the AWS Load Balancer Operator by using the CLI

You can install the AWS Load Balancer Operator by using the CLI.

Prerequisites

You are logged in to the OpenShift Container Platform web console as a user with cluster-admin permissions.
Your cluster is configured with AWS as the platform type and cloud provider.
You are logged into the OpenShift CLI (oc).

Procedure

Create a Namespace object:

Create a YAML file that defines the Namespace object:

Example namespace.yaml file

apiVersion: v1
kind: Namespace
metadata:
  name: aws-load-balancer-operator

apiVersion: v1
kind: Namespace
metadata:
  name: aws-load-balancer-operator

Copy to Clipboard

Create the Namespace object by running the following command:
```
oc apply -f namespace.yaml
```
```
$ oc apply -f namespace.yaml
```
Copy to Clipboard

Create a CredentialsRequest object:

Create a YAML file that defines the CredentialsRequest object:

Example credentialsrequest.yaml file

apiVersion: cloudcredential.openshift.io/v1
kind: CredentialsRequest
metadata:
  name: aws-load-balancer-operator
  namespace: openshift-cloud-credential-operator
spec:
  providerSpec:
    apiVersion: cloudcredential.openshift.io/v1
    kind: AWSProviderSpec
    statementEntries:
      - action:
          - ec2:DescribeSubnets
        effect: Allow
        resource: "*"
      - action:
          - ec2:CreateTags
          - ec2:DeleteTags
        effect: Allow
        resource: arn:aws:ec2:*:*:subnet/*
      - action:
          - ec2:DescribeVpcs
        effect: Allow
        resource: "*"
  secretRef:
    name: aws-load-balancer-operator
    namespace: aws-load-balancer-operator
  serviceAccountNames:
    - aws-load-balancer-operator-controller-manager

apiVersion: cloudcredential.openshift.io/v1
kind: CredentialsRequest
metadata:
  name: aws-load-balancer-operator
  namespace: openshift-cloud-credential-operator
spec:
  providerSpec:
    apiVersion: cloudcredential.openshift.io/v1
    kind: AWSProviderSpec
    statementEntries:
      - action:
          - ec2:DescribeSubnets
        effect: Allow
        resource: "*"
      - action:
          - ec2:CreateTags
          - ec2:DeleteTags
        effect: Allow
        resource: arn:aws:ec2:*:*:subnet/*
      - action:
          - ec2:DescribeVpcs
        effect: Allow
        resource: "*"
  secretRef:
    name: aws-load-balancer-operator
    namespace: aws-load-balancer-operator
  serviceAccountNames:
    - aws-load-balancer-operator-controller-manager

Copy to Clipboard

Create the CredentialsRequest object by running the following command:
```
oc apply -f credentialsrequest.yaml
```
```
$ oc apply -f credentialsrequest.yaml
```
Copy to Clipboard

Create an OperatorGroup object:

Create a YAML file that defines the OperatorGroup object:

Example operatorgroup.yaml file

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: aws-lb-operatorgroup
  namespace: aws-load-balancer-operator
spec:
  upgradeStrategy: Default

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: aws-lb-operatorgroup
  namespace: aws-load-balancer-operator
spec:
  upgradeStrategy: Default

Copy to Clipboard

Create the OperatorGroup object by running the following command:
```
oc apply -f operatorgroup.yaml
```
```
$ oc apply -f operatorgroup.yaml
```
Copy to Clipboard

Create a Subscription object:

Create a YAML file that defines the Subscription object:

Example subscription.yaml file

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: aws-load-balancer-operator
  namespace: aws-load-balancer-operator
spec:
  channel: stable-v1
  installPlanApproval: Automatic
  name: aws-load-balancer-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: aws-load-balancer-operator
  namespace: aws-load-balancer-operator
spec:
  channel: stable-v1
  installPlanApproval: Automatic
  name: aws-load-balancer-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace

Copy to Clipboard

Create the Subscription object by running the following command:
```
oc apply -f subscription.yaml
```
```
$ oc apply -f subscription.yaml
```
Copy to Clipboard

Verification

Get the name of the install plan from the subscription:

oc -n aws-load-balancer-operator \
    get subscription aws-load-balancer-operator \
    --template='{{.status.installplan.name}}{{"\n"}}'

$ oc -n aws-load-balancer-operator \
    get subscription aws-load-balancer-operator \
    --template='{{.status.installplan.name}}{{"\n"}}'

Copy to Clipboard

Check the status of the install plan:

oc -n aws-load-balancer-operator \
    get ip <install_plan_name> \
    --template='{{.status.phase}}{{"\n"}}'

$ oc -n aws-load-balancer-operator \
    get ip <install_plan_name> \
    --template='{{.status.phase}}{{"\n"}}'

Copy to Clipboard

The output must be Complete.

22.4. Preparing for the AWS Load Balancer Operator on a cluster using the AWS Security Token Service

You can install the AWS Load Balancer Operator on a cluster that uses STS. Follow these steps to prepare your cluster before installing the Operator.

The AWS Load Balancer Operator relies on the CredentialsRequest object to bootstrap the Operator and the AWS Load Balancer Controller. The AWS Load Balancer Operator waits until the required secrets are created and available. The Cloud Credential Operator does not provision the secrets automatically in the STS cluster. You must set the credentials secrets manually by using the ccoctl binary.

If you do not want to provision credential secret by using the Cloud Credential Operator, you can configure the AWSLoadBalancerController instance on the STS cluster by specifying the credential secret in the AWS load Balancer Controller custom resource (CR).

22.4.1. Bootstrapping AWS Load Balancer Operator on Security Token Service cluster

Prerequisites

You must extract and prepare the ccoctl binary.

Procedure

Create the aws-load-balancer-operator namespace by running the following command:
```
oc create namespace aws-load-balancer-operator
```
```
$ oc create namespace aws-load-balancer-operator
```
Copy to Clipboard

Download the CredentialsRequest custom resource (CR) of the AWS Load Balancer Operator, and create a directory to store it by running the following command:

curl --create-dirs -o <path-to-credrequests-dir>/cr.yaml https://raw.githubusercontent.com/openshift/aws-load-balancer-operator/main/hack/operator-credentials-request.yaml

$ curl --create-dirs -o <path-to-credrequests-dir>/cr.yaml https://raw.githubusercontent.com/openshift/aws-load-balancer-operator/main/hack/operator-credentials-request.yaml

Copy to Clipboard

Use the ccoctl tool to process CredentialsRequest objects of the AWS Load Balancer Operator, by running the following command:

ccoctl aws create-iam-roles \
    --name <name> --region=<aws_region> \
    --credentials-requests-dir=<path-to-credrequests-dir> \
    --identity-provider-arn <oidc-arn>

$ ccoctl aws create-iam-roles \
    --name <name> --region=<aws_region> \
    --credentials-requests-dir=<path-to-credrequests-dir> \
    --identity-provider-arn <oidc-arn>

Copy to Clipboard

Apply the secrets generated in the manifests directory of your cluster by running the following command:

ls manifests/*-credentials.yaml | xargs -I{} oc apply -f {}

$ ls manifests/*-credentials.yaml | xargs -I{} oc apply -f {}

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Verify that the credentials secret of the AWS Load Balancer Operator is created by running the following command:

oc -n aws-load-balancer-operator get secret aws-load-balancer-operator --template='{{index .data "credentials"}}' | base64 -d

$ oc -n aws-load-balancer-operator get secret aws-load-balancer-operator --template='{{index .data "credentials"}}' | base64 -d

Copy to Clipboard

Example output

[default]
sts_regional_endpoints = regional
role_arn = arn:aws:iam::999999999999:role/aws-load-balancer-operator-aws-load-balancer-operator
web_identity_token_file = /var/run/secrets/openshift/serviceaccount/token

[default]
sts_regional_endpoints = regional
role_arn = arn:aws:iam::999999999999:role/aws-load-balancer-operator-aws-load-balancer-operator
web_identity_token_file = /var/run/secrets/openshift/serviceaccount/token

Copy to Clipboard

22.4.2. Configuring AWS Load Balancer Operator on Security Token Service cluster by using managed `CredentialsRequest` objects

Prerequisites

You must extract and prepare the ccoctl binary.

Procedure

The AWS Load Balancer Operator creates the CredentialsRequest object in the openshift-cloud-credential-operator namespace for each AWSLoadBalancerController custom resource (CR). You can extract and save the created CredentialsRequest object in a directory by running the following command:
```
oc get credentialsrequest -n openshift-cloud-credential-operator  \
    aws-load-balancer-controller-<cr-name> -o yaml > <path-to-credrequests-dir>/cr.yaml
```
```
$ oc get credentialsrequest -n openshift-cloud-credential-operator  \
    aws-load-balancer-controller-<cr-name> -o yaml > <path-to-credrequests-dir>/cr.yaml 
```
1
Copy to Clipboard
1
The aws-load-balancer-controller-<cr-name> parameter specifies the credential request name created by the AWS Load Balancer Operator. The cr-name specifies the name of the AWS Load Balancer Controller instance.

Use the ccoctl tool to process all CredentialsRequest objects in the credrequests directory by running the following command:

ccoctl aws create-iam-roles \
    --name <name> --region=<aws_region> \
    --credentials-requests-dir=<path-to-credrequests-dir> \
    --identity-provider-arn <oidc-arn>

$ ccoctl aws create-iam-roles \
    --name <name> --region=<aws_region> \
    --credentials-requests-dir=<path-to-credrequests-dir> \
    --identity-provider-arn <oidc-arn>

Copy to Clipboard

Apply the secrets generated in manifests directory to your cluster, by running the following command:

ls manifests/*-credentials.yaml | xargs -I{} oc apply -f {}

$ ls manifests/*-credentials.yaml | xargs -I{} oc apply -f {}

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Verify that the aws-load-balancer-controller pod is created:

oc -n aws-load-balancer-operator get pods

$ oc -n aws-load-balancer-operator get pods
NAME                                                            READY   STATUS    RESTARTS   AGE
aws-load-balancer-controller-cluster-9b766d6-gg82c              1/1     Running   0          137m
aws-load-balancer-operator-controller-manager-b55ff68cc-85jzg   2/2     Running   0          3h26m

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22.4.3. Configuring the AWS Load Balancer Operator on Security Token Service cluster by using specific credentials

You can specify the credential secret by using the spec.credentials field in the AWS Load Balancer Controller custom resource (CR). You can use the predefined CredentialsRequest object of the controller to know which roles are required.

Prerequisites

You must extract and prepare the ccoctl binary.

Procedure

Download the CredentialsRequest custom resource (CR) of the AWS Load Balancer Controller, and create a directory to store it by running the following command:

curl --create-dirs -o <path-to-credrequests-dir>/cr.yaml https://raw.githubusercontent.com/openshift/aws-load-balancer-operator/main/hack/controller/controller-credentials-request.yaml

$ curl --create-dirs -o <path-to-credrequests-dir>/cr.yaml https://raw.githubusercontent.com/openshift/aws-load-balancer-operator/main/hack/controller/controller-credentials-request.yaml

Copy to Clipboard

Use the ccoctl tool to process the CredentialsRequest object of the controller:

ccoctl aws create-iam-roles \
        --name <name> --region=<aws_region> \
        --credentials-requests-dir=<path-to-credrequests-dir> \
        --identity-provider-arn <oidc-arn>

$ ccoctl aws create-iam-roles \
        --name <name> --region=<aws_region> \
        --credentials-requests-dir=<path-to-credrequests-dir> \
        --identity-provider-arn <oidc-arn>

Copy to Clipboard

Apply the secrets to your cluster:

ls manifests/*-credentials.yaml | xargs -I{} oc apply -f {}

$ ls manifests/*-credentials.yaml | xargs -I{} oc apply -f {}

Copy to Clipboard

Verify the credentials secret has been created for use by the controller:

oc -n aws-load-balancer-operator get secret aws-load-balancer-controller-manual-cluster --template='{{index .data "credentials"}}' | base64 -d

$ oc -n aws-load-balancer-operator get secret aws-load-balancer-controller-manual-cluster --template='{{index .data "credentials"}}' | base64 -d

Copy to Clipboard

Example output

[default]
    sts_regional_endpoints = regional
    role_arn = arn:aws:iam::999999999999:role/aws-load-balancer-operator-aws-load-balancer-controller
    web_identity_token_file = /var/run/secrets/openshift/serviceaccount/token

[default]
    sts_regional_endpoints = regional
    role_arn = arn:aws:iam::999999999999:role/aws-load-balancer-operator-aws-load-balancer-controller
    web_identity_token_file = /var/run/secrets/openshift/serviceaccount/token

Copy to Clipboard

Create the AWSLoadBalancerController resource YAML file, for example, sample-aws-lb-manual-creds.yaml, as follows:
```
apiVersion: networking.olm.openshift.io/v1
kind: AWSLoadBalancerController 
metadata:
  name: cluster 
spec:
  credentials:
    name: <secret-name> 
```
```
apiVersion: networking.olm.openshift.io/v1
kind: AWSLoadBalancerController 
```
1
```
metadata:
  name: cluster 
```
2
```
spec:
  credentials:
    name: <secret-name> 
```
3
Copy to Clipboard
1
Defines the AWSLoadBalancerController resource.
2
Defines the AWS Load Balancer Controller instance name. This instance name gets added as a suffix to all related resources.
3
Specifies the secret name containing AWS credentials that the controller uses.

22.5. Creating an instance of the AWS Load Balancer Controller

After installing the AWS Load Balancer Operator, you can create the AWS Load Balancer Controller.

22.5.1. Creating the AWS Load Balancer Controller

You can install only a single instance of the AWSLoadBalancerController object in a cluster. You can create the AWS Load Balancer Controller by using CLI. The AWS Load Balancer Operator reconciles only the cluster named resource.

Prerequisites

You have created the echoserver namespace.
You have access to the OpenShift CLI (oc).

Procedure

Create a YAML file that defines the AWSLoadBalancerController object:
Example sample-aws-lb.yaml file
```
apiVersion: networking.olm.openshift.io/v1
kind: AWSLoadBalancerController 
metadata:
  name: cluster 
spec:
  subnetTagging: Auto 
  additionalResourceTags: 
  - key: example.org/security-scope
    value: staging
  ingressClass: alb 
  config:
    replicas: 2 
  enabledAddons: 
    - AWSWAFv2 
```
```
apiVersion: networking.olm.openshift.io/v1
kind: AWSLoadBalancerController 
```
1
```
metadata:
  name: cluster 
```
2
```
spec:
  subnetTagging: Auto 
```
3
```
  additionalResourceTags: 
```
4
```
  - key: example.org/security-scope
    value: staging
  ingressClass: alb 
```
5
```
  config:
    replicas: 2 
```
6
```
  enabledAddons: 
```
7
```
    - AWSWAFv2 
```
8
Copy to Clipboard
1
Defines the AWSLoadBalancerController object.
2
Defines the AWS Load Balancer Controller name. This instance name gets added as a suffix to all related resources.
3
Configures the subnet tagging method for the AWS Load Balancer Controller. The following values are valid:
Auto: The AWS Load Balancer Operator determines the subnets that belong to the cluster and tags them appropriately. The Operator cannot determine the role correctly if the internal subnet tags are not present on internal subnet.
Manual: You manually tag the subnets that belong to the cluster with the appropriate role tags. Use this option if you installed your cluster on user-provided infrastructure.
4
Defines the tags used by the AWS Load Balancer Controller when it provisions AWS resources.
5
Defines the ingress class name. The default value is alb.
6
Specifies the number of replicas of the AWS Load Balancer Controller.
7
Specifies annotations as an add-on for the AWS Load Balancer Controller.
8
Enables the alb.ingress.kubernetes.io/wafv2-acl-arn annotation.
Create the AWSLoadBalancerController object by running the following command:
```
oc create -f sample-aws-lb.yaml
```
```
$ oc create -f sample-aws-lb.yaml
```
Copy to Clipboard

Create a YAML file that defines the Deployment resource:

Example sample-aws-lb.yaml file

apiVersion: apps/v1
kind: Deployment 
metadata:
  name: <echoserver> 
  namespace: echoserver
spec:
  selector:
    matchLabels:
      app: echoserver
  replicas: 3 
  template:
    metadata:
      labels:
        app: echoserver
    spec:
      containers:
        - image: openshift/origin-node
          command:
           - "/bin/socat"
          args:
            - TCP4-LISTEN:8080,reuseaddr,fork
            - EXEC:'/bin/bash -c \"printf \\\"HTTP/1.0 200 OK\r\n\r\n\\\"; sed -e \\\"/^\r/q\\\"\"'
          imagePullPolicy: Always
          name: echoserver
          ports:
            - containerPort: 8080

apiVersion: apps/v1
kind: Deployment

1


metadata:
  name: <echoserver>

2


  namespace: echoserver
spec:
  selector:
    matchLabels:
      app: echoserver
  replicas: 3

3


  template:
    metadata:
      labels:
        app: echoserver
    spec:
      containers:
        - image: openshift/origin-node
          command:
           - "/bin/socat"
          args:
            - TCP4-LISTEN:8080,reuseaddr,fork
            - EXEC:'/bin/bash -c \"printf \\\"HTTP/1.0 200 OK\r\n\r\n\\\"; sed -e \\\"/^\r/q\\\"\"'
          imagePullPolicy: Always
          name: echoserver
          ports:
            - containerPort: 8080

Copy to Clipboard

1: Defines the deployment resource.
2: Specifies the deployment name.
3: Specifies the number of replicas of the deployment.

Create a YAML file that defines the Service resource:

Example service-albo.yaml file:

apiVersion: v1
kind: Service 
metadata:
  name: <echoserver> 
  namespace: echoserver
spec:
  ports:
    - port: 80
      targetPort: 8080
      protocol: TCP
  type: NodePort
  selector:
    app: echoserver

apiVersion: v1
kind: Service

1


metadata:
  name: <echoserver>

2


  namespace: echoserver
spec:
  ports:
    - port: 80
      targetPort: 8080
      protocol: TCP
  type: NodePort
  selector:
    app: echoserver

Copy to Clipboard

1: Defines the service resource.
2: Specifies the service name.

Create a YAML file that defines the Ingress resource:

Example ingress-albo.yaml file:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: <name> 
  namespace: echoserver
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/target-type: instance
spec:
  ingressClassName: alb
  rules:
    - http:
        paths:
          - path: /
            pathType: Exact
            backend:
              service:
                name: <echoserver> 
                port:
                  number: 80

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: <name>

1


  namespace: echoserver
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/target-type: instance
spec:
  ingressClassName: alb
  rules:
    - http:
        paths:
          - path: /
            pathType: Exact
            backend:
              service:
                name: <echoserver>

2


                port:
                  number: 80

Copy to Clipboard

1: Specify a name for the Ingress resource.
2: Specifies the service name.

Verification

Save the status of the Ingress resource in the HOST variable by running the following command:

HOST=$(oc get ingress -n echoserver echoserver --template='{{(index .status.loadBalancer.ingress 0).hostname}}')

$ HOST=$(oc get ingress -n echoserver echoserver --template='{{(index .status.loadBalancer.ingress 0).hostname}}')

Copy to Clipboard

Verify the status of the Ingress resource by running the following command:
```
curl $HOST
```
```
$ curl $HOST
```
Copy to Clipboard

22.6. Serving multiple ingress resources through a single AWS Load Balancer

You can route the traffic to different services that are part of a single domain through a single AWS Load Balancer. Each Ingress resource provides different endpoints of the domain.

22.6.1. Creating multiple ingress resources through a single AWS Load Balancer

You can route the traffic to multiple ingress resources through a single AWS Load Balancer by using the CLI.

Prerequisites

You have an access to the OpenShift CLI (oc).

Procedure

Create an IngressClassParams resource YAML file, for example, sample-single-lb-params.yaml, as follows:
```
apiVersion: elbv2.k8s.aws/v1beta1 
kind: IngressClassParams
metadata:
  name: single-lb-params 
spec:
  group:
    name: single-lb 
```
```
apiVersion: elbv2.k8s.aws/v1beta1 
```
1
```
kind: IngressClassParams
metadata:
  name: single-lb-params 
```
2
```
spec:
  group:
    name: single-lb 
```
3
Copy to Clipboard
1
Defines the API group and version of the IngressClassParams resource.
2
Specifies the IngressClassParams resource name.
3
Specifies the IngressGroup resource name. All of the Ingress resources of this class belong to this IngressGroup.
Create the IngressClassParams resource by running the following command:
```
oc create -f sample-single-lb-params.yaml
```
```
$ oc create -f sample-single-lb-params.yaml
```
Copy to Clipboard
Create the IngressClass resource YAML file, for example, sample-single-lb-class.yaml, as follows:
```
apiVersion: networking.k8s.io/v1 
kind: IngressClass
metadata:
  name: single-lb 
spec:
  controller: ingress.k8s.aws/alb 
  parameters:
    apiGroup: elbv2.k8s.aws 
    kind: IngressClassParams 
    name: single-lb-params 
```
```
apiVersion: networking.k8s.io/v1 
```
1
```
kind: IngressClass
metadata:
  name: single-lb 
```
2
```
spec:
  controller: ingress.k8s.aws/alb 
```
3
```
  parameters:
    apiGroup: elbv2.k8s.aws 
```
4
```
    kind: IngressClassParams 
```
5
```
    name: single-lb-params 
```
6
Copy to Clipboard
1
Defines the API group and version of the IngressClass resource.
2
Specifies the ingress class name.
3
Defines the controller name. The ingress.k8s.aws/alb value denotes that all ingress resources of this class should be managed by the AWS Load Balancer Controller.
4
Defines the API group of the IngressClassParams resource.
5
Defines the resource type of the IngressClassParams resource.
6
Defines the IngressClassParams resource name.
Create the IngressClass resource by running the following command:
```
oc create -f sample-single-lb-class.yaml
```
```
$ oc create -f sample-single-lb-class.yaml
```
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Create the AWSLoadBalancerController resource YAML file, for example, sample-single-lb.yaml, as follows:

apiVersion: networking.olm.openshift.io/v1
kind: AWSLoadBalancerController
metadata:
  name: cluster
spec:
  subnetTagging: Auto
  ingressClass: single-lb

apiVersion: networking.olm.openshift.io/v1
kind: AWSLoadBalancerController
metadata:
  name: cluster
spec:
  subnetTagging: Auto
  ingressClass: single-lb

1

Copy to Clipboard

1: Defines the name of the IngressClass resource.

Create the AWSLoadBalancerController resource by running the following command:
```
oc create -f sample-single-lb.yaml
```
```
$ oc create -f sample-single-lb.yaml
```
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Create the Ingress resource YAML file, for example, sample-multiple-ingress.yaml, as follows:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-1 
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing 
    alb.ingress.kubernetes.io/group.order: "1" 
    alb.ingress.kubernetes.io/target-type: instance 
spec:
  ingressClassName: single-lb 
  rules:
  - host: example.com 
    http:
        paths:
        - path: /blog 
          pathType: Prefix
          backend:
            service:
              name: example-1 
              port:
                number: 80 
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-2
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/group.order: "2"
    alb.ingress.kubernetes.io/target-type: instance
spec:
  ingressClassName: single-lb
  rules:
  - host: example.com
    http:
        paths:
        - path: /store
          pathType: Prefix
          backend:
            service:
              name: example-2
              port:
                number: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-3
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/group.order: "3"
    alb.ingress.kubernetes.io/target-type: instance
spec:
  ingressClassName: single-lb
  rules:
  - host: example.com
    http:
        paths:
        - path: /
          pathType: Prefix
          backend:
            service:
              name: example-3
              port:
                number: 80

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-1

1


  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing

2


    alb.ingress.kubernetes.io/group.order: "1"

3


    alb.ingress.kubernetes.io/target-type: instance

4


spec:
  ingressClassName: single-lb

5


  rules:
  - host: example.com

6


    http:
        paths:
        - path: /blog

7


          pathType: Prefix
          backend:
            service:
              name: example-1

8


              port:
                number: 80

9


---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-2
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/group.order: "2"
    alb.ingress.kubernetes.io/target-type: instance
spec:
  ingressClassName: single-lb
  rules:
  - host: example.com
    http:
        paths:
        - path: /store
          pathType: Prefix
          backend:
            service:
              name: example-2
              port:
                number: 80
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-3
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/group.order: "3"
    alb.ingress.kubernetes.io/target-type: instance
spec:
  ingressClassName: single-lb
  rules:
  - host: example.com
    http:
        paths:
        - path: /
          pathType: Prefix
          backend:
            service:
              name: example-3
              port:
                number: 80

Copy to Clipboard

1: Specifies the ingress name.
2: Indicates the load balancer to provision in the public subnet to access the internet.
3: Specifies the order in which the rules from the multiple ingress resources are matched when the request is received at the load balancer.
4: Indicates that the load balancer will target OpenShift Container Platform nodes to reach the service.
5: Specifies the ingress class that belongs to this ingress.
6: Defines a domain name used for request routing.
7: Defines the path that must route to the service.
8: Defines the service name that serves the endpoint configured in the Ingress resource.
9: Defines the port on the service that serves the endpoint.

Create the Ingress resource by running the following command:

oc create -f sample-multiple-ingress.yaml

$ oc create -f sample-multiple-ingress.yaml

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22.7. Adding TLS termination

You can add TLS termination on the AWS Load Balancer.

22.7.1. Adding TLS termination on the AWS Load Balancer

You can route the traffic for the domain to pods of a service and add TLS termination on the AWS Load Balancer.

Prerequisites

You have an access to the OpenShift CLI (oc).

Procedure

Create a YAML file that defines the AWSLoadBalancerController resource:
Example add-tls-termination-albc.yaml file
```
apiVersion: networking.olm.openshift.io/v1
kind: AWSLoadBalancerController
metadata:
  name: cluster
spec:
  subnetTagging: Auto
  ingressClass: tls-termination 
```
```
apiVersion: networking.olm.openshift.io/v1
kind: AWSLoadBalancerController
metadata:
  name: cluster
spec:
  subnetTagging: Auto
  ingressClass: tls-termination 
```
1
Copy to Clipboard
1
Defines the ingress class name. If the ingress class is not present in your cluster the AWS Load Balancer Controller creates one. The AWS Load Balancer Controller reconciles the additional ingress class values if spec.controller is set to ingress.k8s.aws/alb.

Create a YAML file that defines the Ingress resource:

Example add-tls-termination-ingress.yaml file

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: <example> 
  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing 
    alb.ingress.kubernetes.io/certificate-arn: arn:aws:acm:us-west-2:xxxxx 
spec:
  ingressClassName: tls-termination 
  rules:
  - host: <example.com> 
    http:
        paths:
          - path: /
            pathType: Exact
            backend:
              service:
                name: <example-service> 
                port:
                  number: 80

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: <example>

1


  annotations:
    alb.ingress.kubernetes.io/scheme: internet-facing

2


    alb.ingress.kubernetes.io/certificate-arn: arn:aws:acm:us-west-2:xxxxx

3


spec:
  ingressClassName: tls-termination

4


  rules:
  - host: <example.com>

5


    http:
        paths:
          - path: /
            pathType: Exact
            backend:
              service:
                name: <example-service>

6


                port:
                  number: 80

Copy to Clipboard

1: Specifies the ingress name.
2: The controller provisions the load balancer for ingress in a public subnet to access the load balancer over the internet.
3: The Amazon Resource Name (ARN) of the certificate that you attach to the load balancer.
4: Defines the ingress class name.
5: Defines the domain for traffic routing.
6: Defines the service for traffic routing.

22.8. Configuring cluster-wide proxy

You can configure the cluster-wide proxy in the AWS Load Balancer Operator. After configuring the cluster-wide proxy, Operator Lifecycle Manager (OLM) automatically updates all the deployments of the Operators with the environment variables such as HTTP_PROXY, HTTPS_PROXY, and NO_PROXY. These variables are populated to the managed controller by the AWS Load Balancer Operator.

22.8.1. Trusting the certificate authority of the cluster-wide proxy

Create the config map to contain the certificate authority (CA) bundle in the aws-load-balancer-operator namespace by running the following command:
```
oc -n aws-load-balancer-operator create configmap trusted-ca
```
```
$ oc -n aws-load-balancer-operator create configmap trusted-ca
```
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To inject the trusted CA bundle into the config map, add the config.openshift.io/inject-trusted-cabundle=true label to the config map by running the following command:

oc -n aws-load-balancer-operator label cm trusted-ca config.openshift.io/inject-trusted-cabundle=true

$ oc -n aws-load-balancer-operator label cm trusted-ca config.openshift.io/inject-trusted-cabundle=true

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Update the AWS Load Balancer Operator subscription to access the config map in the AWS Load Balancer Operator deployment by running the following command:

oc -n aws-load-balancer-operator patch subscription aws-load-balancer-operator --type='merge' -p '{"spec":{"config":{"env":[{"name":"TRUSTED_CA_CONFIGMAP_NAME","value":"trusted-ca"}],"volumes":[{"name":"trusted-ca","configMap":{"name":"trusted-ca"}}],"volumeMounts":[{"name":"trusted-ca","mountPath":"/etc/pki/tls/certs/albo-tls-ca-bundle.crt","subPath":"ca-bundle.crt"}]}}}'

$ oc -n aws-load-balancer-operator patch subscription aws-load-balancer-operator --type='merge' -p '{"spec":{"config":{"env":[{"name":"TRUSTED_CA_CONFIGMAP_NAME","value":"trusted-ca"}],"volumes":[{"name":"trusted-ca","configMap":{"name":"trusted-ca"}}],"volumeMounts":[{"name":"trusted-ca","mountPath":"/etc/pki/tls/certs/albo-tls-ca-bundle.crt","subPath":"ca-bundle.crt"}]}}}'

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After the AWS Load Balancer Operator is deployed, verify that the CA bundle is added to the aws-load-balancer-operator-controller-manager deployment by running the following command:

oc -n aws-load-balancer-operator exec deploy/aws-load-balancer-operator-controller-manager -c manager -- bash -c "ls -l /etc/pki/tls/certs/albo-tls-ca-bundle.crt; printenv TRUSTED_CA_CONFIGMAP_NAME"

$ oc -n aws-load-balancer-operator exec deploy/aws-load-balancer-operator-controller-manager -c manager -- bash -c "ls -l /etc/pki/tls/certs/albo-tls-ca-bundle.crt; printenv TRUSTED_CA_CONFIGMAP_NAME"

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Example output

-rw-r--r--. 1 root 1000690000 5875 Jan 11 12:25 /etc/pki/tls/certs/albo-tls-ca-bundle.crt
trusted-ca

-rw-r--r--. 1 root 1000690000 5875 Jan 11 12:25 /etc/pki/tls/certs/albo-tls-ca-bundle.crt
trusted-ca

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Optional: Restart deployment of the AWS Load Balancer Operator every time the config map changes by running the following command:

oc -n aws-load-balancer-operator rollout restart deployment/aws-load-balancer-operator-controller-manager

$ oc -n aws-load-balancer-operator rollout restart deployment/aws-load-balancer-operator-controller-manager

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Chapter 23. Multiple networks

23.1. Understanding multiple networks

In Kubernetes, container networking is delegated to networking plugins that implement the Container Network Interface (CNI).

OpenShift Container Platform uses the Multus CNI plugin to allow chaining of CNI plugins. During cluster installation, you configure your default pod network. The default network handles all ordinary network traffic for the cluster. You can define an additional network based on the available CNI plugins and attach one or more of these networks to your pods. You can define more than one additional network for your cluster, depending on your needs. This gives you flexibility when you configure pods that deliver network functionality, such as switching or routing.

23.1.1. Usage scenarios for an additional network

You can use an additional network in situations where network isolation is needed, including data plane and control plane separation. Isolating network traffic is useful for the following performance and security reasons:

Performance: You can send traffic on two different planes to manage how much traffic is along each plane.
Security: You can send sensitive traffic onto a network plane that is managed specifically for security considerations, and you can separate private data that must not be shared between tenants or customers.

All of the pods in the cluster still use the cluster-wide default network to maintain connectivity across the cluster. Every pod has an eth0 interface that is attached to the cluster-wide pod network. You can view the interfaces for a pod by using the oc exec -it <pod_name> -- ip a command. If you add additional network interfaces that use Multus CNI, they are named net1, net2, …, netN.

To attach additional network interfaces to a pod, you must create configurations that define how the interfaces are attached. You specify each interface by using a NetworkAttachmentDefinition custom resource (CR). A CNI configuration inside each of these CRs defines how that interface is created.

23.1.2. Additional networks in OpenShift Container Platform

OpenShift Container Platform provides the following CNI plugins for creating additional networks in your cluster:

bridge: Configure a bridge-based additional network to allow pods on the same host to communicate with each other and the host.
host-device: Configure a host-device additional network to allow pods access to a physical Ethernet network device on the host system.
ipvlan: Configure an ipvlan-based additional network to allow pods on a host to communicate with other hosts and pods on those hosts, similar to a macvlan-based additional network. Unlike a macvlan-based additional network, each pod shares the same MAC address as the parent physical network interface.
vlan: Configure a vlan-based additional network to allow VLAN-based network isolation and connectivity for pods.
macvlan: Configure a macvlan-based additional network to allow pods on a host to communicate with other hosts and pods on those hosts by using a physical network interface. Each pod that is attached to a macvlan-based additional network is provided a unique MAC address.
SR-IOV: Configure an SR-IOV based additional network to allow pods to attach to a virtual function (VF) interface on SR-IOV capable hardware on the host system.

23.2. Configuring an additional network

As a cluster administrator, you can configure an additional network for your cluster. The following network types are supported:

Bridge
Host device
VLAN
IPVLAN
MACVLAN
OVN-Kubernetes

23.2.1. Approaches to managing an additional network

You can manage the lifecycle of an additional network in OpenShift Container Platform by using one of two approaches: modifying the Cluster Network Operator (CNO) configuration or applying a YAML manifest. Each approach is mutually exclusive and you can only use one approach for managing an additional network at a time. For either approach, the additional network is managed by a Container Network Interface (CNI) plugin that you configure. The two different approaches are summarized here:

Modifying the Cluster Network Operator (CNO) configuration: Configuring additional networks through CNO is only possible for cluster administrators. The CNO automatically creates and manages the NetworkAttachmentDefinition object. By using this approach, you can define NetworkAttachmentDefinition objects at install time through configuration of the install-config.
Applying a YAML manifest: You can manage the additional network directly by creating an NetworkAttachmentDefinition object. Compared to modifying the CNO configuration, this approach gives you more granular control and flexibility when it comes to configuration.

Note

When deploying OpenShift Container Platform nodes with multiple network interfaces on Red Hat OpenStack Platform (RHOSP) with OVN Kubernetes, DNS configuration of the secondary interface might take precedence over the DNS configuration of the primary interface. In this case, remove the DNS nameservers for the subnet ID that is attached to the secondary interface:

openstack subnet set --dns-nameserver 0.0.0.0 <subnet_id>

$ openstack subnet set --dns-nameserver 0.0.0.0 <subnet_id>

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23.2.2. IP address assignment for additional networks

For additional networks, IP addresses can be assigned using an IP Address Management (IPAM) CNI plugin, which supports various assignment methods, including Dynamic Host Configuration Protocol (DHCP) and static assignment.

The DHCP IPAM CNI plugin responsible for dynamic assignment of IP addresses operates with two distinct components:

CNI Plugin: Responsible for integrating with the Kubernetes networking stack to request and release IP addresses.
DHCP IPAM CNI Daemon: A listener for DHCP events that coordinates with existing DHCP servers in the environment to handle IP address assignment requests. This daemon is not a DHCP server itself.

For networks requiring type: dhcp in their IPAM configuration, ensure the following:

A DHCP server is available and running in the environment. The DHCP server is external to the cluster and is expected to be part of the customer’s existing network infrastructure.
The DHCP server is appropriately configured to serve IP addresses to the nodes.

In cases where a DHCP server is unavailable in the environment, it is recommended to use the Whereabouts IPAM CNI plugin instead. The Whereabouts CNI provides similar IP address management capabilities without the need for an external DHCP server.

Note

Use the Whereabouts CNI plugin when there is no external DHCP server or where static IP address management is preferred. The Whereabouts plugin includes a reconciler daemon to manage stale IP address allocations.

A DHCP lease must be periodically renewed throughout the container’s lifetime, so a separate daemon, the DHCP IPAM CNI Daemon, is required. To deploy the DHCP IPAM CNI daemon, modify the Cluster Network Operator (CNO) configuration to trigger the deployment of this daemon as part of the additional network setup.

23.2.3. Configuration for an additional network attachment

An additional network is configured by using the NetworkAttachmentDefinition API in the k8s.cni.cncf.io API group.

Important

Do not store any sensitive information or a secret in the NetworkAttachmentDefinition object because this information is accessible by the project administration user.

The configuration for the API is described in the following table:

Table 23.1. NetworkAttachmentDefinition API fields
Field	Type	Description
`metadata.name`	`string`	The name for the additional network.
`metadata.namespace`	`string`	The namespace that the object is associated with.
`spec.config`	`string`	The CNI plugin configuration in JSON format.

23.2.3.1. Configuration of an additional network through the Cluster Network Operator

The configuration for an additional network attachment is specified as part of the Cluster Network Operator (CNO) configuration.

The following YAML describes the configuration parameters for managing an additional network with the CNO:

Cluster Network Operator configuration

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  # ...
  additionalNetworks: 
  - name: <name> 
    namespace: <namespace> 
    rawCNIConfig: |- 
      {
        ...
      }
    type: Raw

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  # ...
  additionalNetworks:

1


  - name: <name>

2


    namespace: <namespace>

3


    rawCNIConfig: |-

4


      {
        ...
      }
    type: Raw

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1: An array of one or more additional network configurations.
2: The name for the additional network attachment that you are creating. The name must be unique within the specified namespace.
3: The namespace to create the network attachment in. If you do not specify a value then the default namespace is used.
Important
To prevent namespace issues for the OVN-Kubernetes network plugin, do not name your additional network attachment default, because this namespace is reserved for the default additional network attachment.
4: A CNI plugin configuration in JSON format.

23.2.3.2. Configuration of an additional network from a YAML manifest

The configuration for an additional network is specified from a YAML configuration file, such as in the following example:

apiVersion: k8s.cni.cncf.io/v1
kind: NetworkAttachmentDefinition
metadata:
  name: <name> 
spec:
  config: |- 
    {
      ...
    }

apiVersion: k8s.cni.cncf.io/v1
kind: NetworkAttachmentDefinition
metadata:
  name: <name>

1


spec:
  config: |-

2


    {
      ...
    }

Copy to Clipboard

1: The name for the additional network attachment that you are creating.
2: A CNI plugin configuration in JSON format.

23.2.4. Configurations for additional network types

The specific configuration fields for additional networks is described in the following sections.

23.2.4.1. Configuration for a bridge additional network

The following object describes the configuration parameters for the bridge CNI plugin:

Table 23.2. Bridge CNI plugin JSON configuration object
Field	Type	Description
`cniVersion`	`string`	The CNI specification version. The `0.3.1` value is required.
`name`	`string`	The value for the `name` parameter you provided previously for the CNO configuration.
`type`	`string`	The name of the CNI plugin to configure: `bridge`.
`ipam`	`object`	The configuration object for the IPAM CNI plugin. The plugin manages IP address assignment for the attachment definition.
`bridge`	`string`	Optional: Specify the name of the virtual bridge to use. If the bridge interface does not exist on the host, it is created. The default value is `cni0`.
`ipMasq`	`boolean`	Optional: Set to `true` to enable IP masquerading for traffic that leaves the virtual network. The source IP address for all traffic is rewritten to the bridge’s IP address. If the bridge does not have an IP address, this setting has no effect. The default value is `false`.
`isGateway`	`boolean`	Optional: Set to `true` to assign an IP address to the bridge. The default value is `false`.
`isDefaultGateway`	`boolean`	Optional: Set to `true` to configure the bridge as the default gateway for the virtual network. The default value is `false`. If `isDefaultGateway` is set to `true`, then `isGateway` is also set to `true` automatically.
`forceAddress`	`boolean`	Optional: Set to `true` to allow assignment of a previously assigned IP address to the virtual bridge. When set to `false`, if an IPv4 address or an IPv6 address from overlapping subsets is assigned to the virtual bridge, an error occurs. The default value is `false`.
`hairpinMode`	`boolean`	Optional: Set to `true` to allow the virtual bridge to send an Ethernet frame back through the virtual port it was received on. This mode is also known as reflective relay. The default value is `false`.
`promiscMode`	`boolean`	Optional: Set to `true` to enable promiscuous mode on the bridge. The default value is `false`.
`vlan`	`string`	Optional: Specify a virtual LAN (VLAN) tag as an integer value. By default, no VLAN tag is assigned.
`preserveDefaultVlan`	`string`	Optional: Indicates whether the default vlan must be preserved on the `veth` end connected to the bridge. Defaults to true.
`mtu`	`integer`	Optional: Set the maximum transmission unit (MTU) to the specified value. The default value is automatically set by the kernel.
`enabledad`	`boolean`	Optional: Enables duplicate address detection for the container side `veth`. The default value is `false`.
`macspoofchk`	`boolean`	Optional: Enables mac spoof check, limiting the traffic originating from the container to the mac address of the interface. The default value is `false`.

Note

The VLAN parameter configures the VLAN tag on the host end of the veth and also enables the vlan_filtering feature on the bridge interface.

Note

To configure uplink for a L2 network you need to allow the vlan on the uplink interface by using the following command:

 bridge vlan add vid VLAN_ID dev DEV

$  bridge vlan add vid VLAN_ID dev DEV

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23.2.4.1.1. bridge configuration example

The following example configures an additional network named bridge-net:

{
  "cniVersion": "0.3.1",
  "name": "bridge-net",
  "type": "bridge",
  "isGateway": true,
  "vlan": 2,
  "ipam": {
    "type": "dhcp"
    }
}

{
  "cniVersion": "0.3.1",
  "name": "bridge-net",
  "type": "bridge",
  "isGateway": true,
  "vlan": 2,
  "ipam": {
    "type": "dhcp"
    }
}

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23.2.4.2. Configuration for a host device additional network

Note

Specify your network device by setting only one of the following parameters: device,hwaddr, kernelpath, or pciBusID.

The following object describes the configuration parameters for the host-device CNI plugin:

Table 23.3. Host device CNI plugin JSON configuration object
Field	Type	Description
`cniVersion`	`string`	The CNI specification version. The `0.3.1` value is required.
`name`	`string`	The value for the `name` parameter you provided previously for the CNO configuration.
`type`	`string`	The name of the CNI plugin to configure: `host-device`.
`device`	`string`	Optional: The name of the device, such as `eth0`.
`hwaddr`	`string`	Optional: The device hardware MAC address.
`kernelpath`	`string`	Optional: The Linux kernel device path, such as `/sys/devices/pci0000:00/0000:00:1f.6`.
`pciBusID`	`string`	Optional: The PCI address of the network device, such as `0000:00:1f.6`.

23.2.4.2.1. host-device configuration example

The following example configures an additional network named hostdev-net:

{
  "cniVersion": "0.3.1",
  "name": "hostdev-net",
  "type": "host-device",
  "device": "eth1"
}

{
  "cniVersion": "0.3.1",
  "name": "hostdev-net",
  "type": "host-device",
  "device": "eth1"
}

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23.2.4.3. Configuration for an VLAN additional network

The following object describes the configuration parameters for the VLAN CNI plugin:

Table 23.4. VLAN CNI plugin JSON configuration object
Field	Type	Description
`cniVersion`	`string`	The CNI specification version. The `0.3.1` value is required.
`name`	`string`	The value for the `name` parameter you provided previously for the CNO configuration.
`type`	`string`	The name of the CNI plugin to configure: `vlan`.
`master`	`string`	The Ethernet interface to associate with the network attachment. If a `master` is not specified, the interface for the default network route is used.
`vlanId`	`integer`	Set the id of the vlan.
`ipam`	`object`	The configuration object for the IPAM CNI plugin. The plugin manages IP address assignment for the attachment definition.
`mtu`	`integer`	Optional: Set the maximum transmission unit (MTU) to the specified value. The default value is automatically set by the kernel.
`dns`	`integer`	Optional: DNS information to return, for example, a priority-ordered list of DNS nameservers.
`linkInContainer`	`boolean`	Optional: Specifies if the master interface is in the container network namespace or the main network namespace.

23.2.4.3.1. vlan configuration example

The following example configures an additional network named vlan-net:

{
  "name": "vlan-net",
  "cniVersion": "0.3.1",
  "type": "vlan",
  "master": "eth0",
  "mtu": 1500,
  "vlanId": 5,
  "linkInContainer": false,
  "ipam": {
      "type": "host-local",
      "subnet": "10.1.1.0/24"
  },
  "dns": {
      "nameservers": [ "10.1.1.1", "8.8.8.8" ]
  }
}

{
  "name": "vlan-net",
  "cniVersion": "0.3.1",
  "type": "vlan",
  "master": "eth0",
  "mtu": 1500,
  "vlanId": 5,
  "linkInContainer": false,
  "ipam": {
      "type": "host-local",
      "subnet": "10.1.1.0/24"
  },
  "dns": {
      "nameservers": [ "10.1.1.1", "8.8.8.8" ]
  }
}

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23.2.4.4. Configuration for an IPVLAN additional network

The following object describes the configuration parameters for the IPVLAN CNI plugin:

Table 23.5. IPVLAN CNI plugin JSON configuration object
Field	Type	Description
`cniVersion`	`string`	The CNI specification version. The `0.3.1` value is required.
`name`	`string`	The value for the `name` parameter you provided previously for the CNO configuration.
`type`	`string`	The name of the CNI plugin to configure: `ipvlan`.
`ipam`	`object`	The configuration object for the IPAM CNI plugin. The plugin manages IP address assignment for the attachment definition. This is required unless the plugin is chained.
`mode`	`string`	Optional: The operating mode for the virtual network. The value must be `l2`, `l3`, or `l3s`. The default value is `l2`.
`master`	`string`	Optional: The Ethernet interface to associate with the network attachment. If a `master` is not specified, the interface for the default network route is used.
`mtu`	`integer`	Optional: Set the maximum transmission unit (MTU) to the specified value. The default value is automatically set by the kernel.

Note

The ipvlan object does not allow virtual interfaces to communicate with the master interface. Therefore the container will not be able to reach the host by using the ipvlan interface. Be sure that the container joins a network that provides connectivity to the host, such as a network supporting the Precision Time Protocol (PTP).
A single master interface cannot simultaneously be configured to use both macvlan and ipvlan.
For IP allocation schemes that cannot be interface agnostic, the ipvlan plugin can be chained with an earlier plugin that handles this logic. If the master is omitted, then the previous result must contain a single interface name for the ipvlan plugin to enslave. If ipam is omitted, then the previous result is used to configure the ipvlan interface.

23.2.4.4.1. ipvlan configuration example

The following example configures an additional network named ipvlan-net:

{
  "cniVersion": "0.3.1",
  "name": "ipvlan-net",
  "type": "ipvlan",
  "master": "eth1",
  "mode": "l3",
  "ipam": {
    "type": "static",
    "addresses": [
       {
         "address": "192.168.10.10/24"
       }
    ]
  }
}

{
  "cniVersion": "0.3.1",
  "name": "ipvlan-net",
  "type": "ipvlan",
  "master": "eth1",
  "mode": "l3",
  "ipam": {
    "type": "static",
    "addresses": [
       {
         "address": "192.168.10.10/24"
       }
    ]
  }
}

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23.2.4.5. Configuration for a MACVLAN additional network

The following object describes the configuration parameters for the MAC Virtual LAN (MACVLAN) Container Network Interface (CNI) plugin:

Table 23.6. MACVLAN CNI plugin JSON configuration object
Field	Type	Description
`cniVersion`	`string`	The CNI specification version. The `0.3.1` value is required.
`name`	`string`	The value for the `name` parameter you provided previously for the CNO configuration.
`type`	`string`	The name of the CNI plugin to configure: `macvlan`.
`ipam`	`object`	The configuration object for the IPAM CNI plugin. The plugin manages IP address assignment for the attachment definition.
`mode`	`string`	Optional: Configures traffic visibility on the virtual network. Must be either `bridge`, `passthru`, `private`, or `vepa`. If a value is not provided, the default value is `bridge`.
`master`	`string`	Optional: The host network interface to associate with the newly created macvlan interface. If a value is not specified, then the default route interface is used.
`mtu`	`integer`	Optional: The maximum transmission unit (MTU) to the specified value. The default value is automatically set by the kernel.

Note

If you specify the master key for the plugin configuration, use a different physical network interface than the one that is associated with your primary network plugin to avoid possible conflicts.

23.2.4.5.1. MACVLAN configuration example

The following example configures an additional network named macvlan-net:

{
  "cniVersion": "0.3.1",
  "name": "macvlan-net",
  "type": "macvlan",
  "master": "eth1",
  "mode": "bridge",
  "ipam": {
    "type": "dhcp"
    }
}

{
  "cniVersion": "0.3.1",
  "name": "macvlan-net",
  "type": "macvlan",
  "master": "eth1",
  "mode": "bridge",
  "ipam": {
    "type": "dhcp"
    }
}

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23.2.4.6. Configuration for an OVN-Kubernetes additional network

The Red Hat OpenShift Networking OVN-Kubernetes network plugin allows the configuration of secondary network interfaces for pods. To configure secondary network interfaces, you must define the configurations in the NetworkAttachmentDefinition custom resource definition (CRD).

Important

Configuration for an OVN-Kubernetes additional network is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

Note

Pod and multi-network policy creation might remain in a pending state until the OVN-Kubernetes control plane agent in the nodes processes the associated network-attachment-definition CR.

The following sections provide example configurations for each of the topologies that OVN-Kubernetes currently allows for secondary networks.

Note

Networks names must be unique. For example, creating multiple NetworkAttachmentDefinition CRDs with different configurations that reference the same network is unsupported.

23.2.4.6.1. OVN-Kubernetes network plugin JSON configuration table

The following table describes the configuration parameters for the OVN-Kubernetes CNI network plugin:

Table 23.7. OVN-Kubernetes network plugin JSON configuration table
Field	Type	Description
`cniVersion`	`string`	The CNI specification version. The required value is `0.3.1`.
`name`	`string`	The name of the network. These networks are not namespaced. For example, you can have a network named `l2-network` referenced from two different `NetworkAttachmentDefinitions` that exist on two different namespaces. This ensures that pods making use of the `NetworkAttachmentDefinition` on their own different namespaces can communicate over the same secondary network. However, those two different `NetworkAttachmentDefinitions` must also share the same network specific parameters such as `topology`, `subnets`, `mtu`, and `excludeSubnets`.
`type`	`string`	The name of the CNI plugin to configure. The required value is `ovn-k8s-cni-overlay`.
`topology`	`string`	The topological configuration for the network. The required value is `layer2`.
`subnets`	`string`	The subnet to use for the network across the cluster. For `"topology":"layer2"` deployments, IPv6 (`2001:DBB::/64`) and dual-stack (`192.168.100.0/24,2001:DBB::/64`) subnets are supported.
`mtu`	`string`	The maximum transmission unit (MTU) to the specified value. The default value, `1300`, is automatically set by the kernel.
`netAttachDefName`	`string`	The metadata `namespace` and `name` of the network attachment definition object where this configuration is included. For example, if this configuration is defined in a `NetworkAttachmentDefinition` in namespace `ns1` named `l2-network`, this should be set to `ns1/l2-network`.
`excludeSubnets`	`string`	A comma-separated list of CIDRs and IPs. IPs are removed from the assignable IP pool, and are never passed to the pods. When omitted, the logical switch implementing the network only provides layer 2 communication, and users must configure IPs for the pods. Port security only prevents MAC spoofing.

23.2.4.6.2. Configuration for a switched topology

The switched (layer 2) topology networks interconnect the workloads through a cluster-wide logical switch. This configuration can be used for IPv6 and dual-stack deployments.

Note

Layer 2 switched topology networks only allow for the transfer of data packets between pods within a cluster.

The following NetworkAttachmentDefinition custom resource definition (CRD) YAML describes the fields needed to configure a switched secondary network.

    {
            "cniVersion": "0.3.1",
            "name": "l2-network",
            "type": "ovn-k8s-cni-overlay",
            "topology":"layer2",
            "subnets": "10.100.200.0/24",
            "mtu": 1300,
            "netAttachDefName": "ns1/l2-network",
            "excludeSubnets": "10.100.200.0/29"
    }

    {
            "cniVersion": "0.3.1",
            "name": "l2-network",
            "type": "ovn-k8s-cni-overlay",
            "topology":"layer2",
            "subnets": "10.100.200.0/24",
            "mtu": 1300,
            "netAttachDefName": "ns1/l2-network",
            "excludeSubnets": "10.100.200.0/29"
    }

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23.2.4.6.3. Configuring pods for additional networks

You must specify the secondary network attachments through the k8s.v1.cni.cncf.io/networks annotation.

The following example provisions a pod with two secondary attachments, one for each of the attachment configurations presented in this guide.

apiVersion: v1
kind: Pod
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: l2-network
  name: tinypod
  namespace: ns1
spec:
  containers:
  - args:
    - pause
    image: k8s.gcr.io/e2e-test-images/agnhost:2.36
    imagePullPolicy: IfNotPresent
    name: agnhost-container

apiVersion: v1
kind: Pod
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: l2-network
  name: tinypod
  namespace: ns1
spec:
  containers:
  - args:
    - pause
    image: k8s.gcr.io/e2e-test-images/agnhost:2.36
    imagePullPolicy: IfNotPresent
    name: agnhost-container

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23.2.4.6.4. Configuring pods with a static IP address

The following example provisions a pod with a static IP address.

Note

You can only specify the IP address for a pod’s secondary network attachment for layer 2 attachments.
Specifying a static IP address for the pod is only possible when the attachment configuration does not feature subnets.

apiVersion: v1
kind: Pod
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
      {
        "name": "l2-network", 
        "mac": "02:03:04:05:06:07", 
        "interface": "myiface1", 
        "ips": [
          "192.0.2.20/24"
          ] 
      }
    ]'
  name: tinypod
  namespace: ns1
spec:
  containers:
  - args:
    - pause
    image: k8s.gcr.io/e2e-test-images/agnhost:2.36
    imagePullPolicy: IfNotPresent
    name: agnhost-container

apiVersion: v1
kind: Pod
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
      {
        "name": "l2-network",

1


        "mac": "02:03:04:05:06:07",

2


        "interface": "myiface1",

3


        "ips": [
          "192.0.2.20/24"
          ]

4


      }
    ]'
  name: tinypod
  namespace: ns1
spec:
  containers:
  - args:
    - pause
    image: k8s.gcr.io/e2e-test-images/agnhost:2.36
    imagePullPolicy: IfNotPresent
    name: agnhost-container

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1: The name of the network. This value must be unique across all NetworkAttachmentDefinitions.
2: The MAC address to be assigned for the interface.
3: The name of the network interface to be created for the pod.
4: The IP addresses to be assigned to the network interface.

23.2.5. Configuration of IP address assignment for an additional network

The IP address management (IPAM) Container Network Interface (CNI) plugin provides IP addresses for other CNI plugins.

You can use the following IP address assignment types:

Static assignment.
Dynamic assignment through a DHCP server. The DHCP server you specify must be reachable from the additional network.
Dynamic assignment through the Whereabouts IPAM CNI plugin.

23.2.5.1. Static IP address assignment configuration

The following table describes the configuration for static IP address assignment:

Table 23.8. ipam static configuration object
Field	Type	Description
`type`	`string`	The IPAM address type. The value `static` is required.
`addresses`	`array`	An array of objects specifying IP addresses to assign to the virtual interface. Both IPv4 and IPv6 IP addresses are supported.
`routes`	`array`	An array of objects specifying routes to configure inside the pod.
`dns`	`array`	Optional: An array of objects specifying the DNS configuration.

The addresses array requires objects with the following fields:

Table 23.9. ipam.addresses[] array
Field	Type	Description
`address`	`string`	An IP address and network prefix that you specify. For example, if you specify `10.10.21.10/24`, then the additional network is assigned an IP address of `10.10.21.10` and the netmask is `255.255.255.0`.
`gateway`	`string`	The default gateway to route egress network traffic to.

Table 23.10. ipam.routes[] array
Field	Type	Description
`dst`	`string`	The IP address range in CIDR format, such as `192.168.17.0/24` or `0.0.0.0/0` for the default route.
`gw`	`string`	The gateway where network traffic is routed.

Table 23.11. ipam.dns object
Field	Type	Description
`nameservers`	`array`	An array of one or more IP addresses for to send DNS queries to.
`domain`	`array`	The default domain to append to a hostname. For example, if the domain is set to `example.com`, a DNS lookup query for `example-host` is rewritten as `example-host.example.com`.
`search`	`array`	An array of domain names to append to an unqualified hostname, such as `example-host`, during a DNS lookup query.

Static IP address assignment configuration example

{
  "ipam": {
    "type": "static",
      "addresses": [
        {
          "address": "191.168.1.7/24"
        }
      ]
  }
}

{
  "ipam": {
    "type": "static",
      "addresses": [
        {
          "address": "191.168.1.7/24"
        }
      ]
  }
}

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23.2.5.2. Dynamic IP address (DHCP) assignment configuration

The following JSON describes the configuration for dynamic IP address address assignment with DHCP.

Renewal of DHCP leases

A pod obtains its original DHCP lease when it is created. The lease must be periodically renewed by a minimal DHCP server deployment running on the cluster.

To trigger the deployment of the DHCP server, you must create a shim network attachment by editing the Cluster Network Operator configuration, as in the following example:

Example shim network attachment definition

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks:
  - name: dhcp-shim
    namespace: default
    type: Raw
    rawCNIConfig: |-
      {
        "name": "dhcp-shim",
        "cniVersion": "0.3.1",
        "type": "bridge",
        "ipam": {
          "type": "dhcp"
        }
      }
  # ...

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks:
  - name: dhcp-shim
    namespace: default
    type: Raw
    rawCNIConfig: |-
      {
        "name": "dhcp-shim",
        "cniVersion": "0.3.1",
        "type": "bridge",
        "ipam": {
          "type": "dhcp"
        }
      }
  # ...

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Table 23.12. ipam DHCP configuration object
Field	Type	Description
`type`	`string`	The IPAM address type. The value `dhcp` is required.

Dynamic IP address (DHCP) assignment configuration example

{
  "ipam": {
    "type": "dhcp"
  }
}

{
  "ipam": {
    "type": "dhcp"
  }
}

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23.2.5.3. Dynamic IP address assignment configuration with Whereabouts

The Whereabouts CNI plugin allows the dynamic assignment of an IP address to an additional network without the use of a DHCP server.

The following table describes the configuration for dynamic IP address assignment with Whereabouts:

Table 23.13. ipam whereabouts configuration object
Field	Type	Description
`type`	`string`	The IPAM address type. The value `whereabouts` is required.
`range`	`string`	An IP address and range in CIDR notation. IP addresses are assigned from within this range of addresses.
`exclude`	`array`	Optional: A list of zero or more IP addresses and ranges in CIDR notation. IP addresses within an excluded address range are not assigned.

Dynamic IP address assignment configuration example that uses Whereabouts

{
  "ipam": {
    "type": "whereabouts",
    "range": "192.0.2.192/27",
    "exclude": [
       "192.0.2.192/30",
       "192.0.2.196/32"
    ]
  }
}

{
  "ipam": {
    "type": "whereabouts",
    "range": "192.0.2.192/27",
    "exclude": [
       "192.0.2.192/30",
       "192.0.2.196/32"
    ]
  }
}

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23.2.5.4. Creating a whereabouts-reconciler daemon set

The Whereabouts reconciler is responsible for managing dynamic IP address assignments for the pods within a cluster by using the Whereabouts IP Address Management (IPAM) solution. It ensures that each pod gets a unique IP address from the specified IP address range. It also handles IP address releases when pods are deleted or scaled down.

Note

You can also use a NetworkAttachmentDefinition custom resource (CR) for dynamic IP address assignment.

The whereabouts-reconciler daemon set is automatically created when you configure an additional network through the Cluster Network Operator. It is not automatically created when you configure an additional network from a YAML manifest.

To trigger the deployment of the whereabouts-reconciler daemon set, you must manually create a whereabouts-shim network attachment by editing the Cluster Network Operator custom resource (CR) file.

Use the following procedure to deploy the whereabouts-reconciler daemon set.

Procedure

Edit the Network.operator.openshift.io custom resource (CR) by running the following command:
```
oc edit network.operator.openshift.io cluster
```
```
$ oc edit network.operator.openshift.io cluster
```
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Include the additionalNetworks section shown in this example YAML extract within the spec definition of the custom resource (CR):

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
# ...
spec:
  additionalNetworks:
  - name: whereabouts-shim
    namespace: default
    rawCNIConfig: |-
      {
       "name": "whereabouts-shim",
       "cniVersion": "0.3.1",
       "type": "bridge",
       "ipam": {
         "type": "whereabouts"
       }
      }
    type: Raw
# ...

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
# ...
spec:
  additionalNetworks:
  - name: whereabouts-shim
    namespace: default
    rawCNIConfig: |-
      {
       "name": "whereabouts-shim",
       "cniVersion": "0.3.1",
       "type": "bridge",
       "ipam": {
         "type": "whereabouts"
       }
      }
    type: Raw
# ...

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Save the file and exit the text editor.

Verify that the whereabouts-reconciler daemon set deployed successfully by running the following command:

oc get all -n openshift-multus | grep whereabouts-reconciler

$ oc get all -n openshift-multus | grep whereabouts-reconciler

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Example output

pod/whereabouts-reconciler-jnp6g 1/1 Running 0 6s
pod/whereabouts-reconciler-k76gg 1/1 Running 0 6s
pod/whereabouts-reconciler-k86t9 1/1 Running 0 6s
pod/whereabouts-reconciler-p4sxw 1/1 Running 0 6s
pod/whereabouts-reconciler-rvfdv 1/1 Running 0 6s
pod/whereabouts-reconciler-svzw9 1/1 Running 0 6s
daemonset.apps/whereabouts-reconciler 6 6 6 6 6 kubernetes.io/os=linux 6s

pod/whereabouts-reconciler-jnp6g 1/1 Running 0 6s
pod/whereabouts-reconciler-k76gg 1/1 Running 0 6s
pod/whereabouts-reconciler-k86t9 1/1 Running 0 6s
pod/whereabouts-reconciler-p4sxw 1/1 Running 0 6s
pod/whereabouts-reconciler-rvfdv 1/1 Running 0 6s
pod/whereabouts-reconciler-svzw9 1/1 Running 0 6s
daemonset.apps/whereabouts-reconciler 6 6 6 6 6 kubernetes.io/os=linux 6s

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23.2.5.5. Configuring the Whereabouts IP reconciler schedule

The Whereabouts IPAM CNI plugin runs the IP reconciler daily. This process cleans up any stranded IP allocations that might result in exhausting IPs and therefore prevent new pods from getting an IP allocated to them.

Use this procedure to change the frequency at which the IP reconciler runs.

Prerequisites

You installed the OpenShift CLI (oc).
You have access to the cluster as a user with the cluster-admin role.
You have deployed the whereabouts-reconciler daemon set, and the whereabouts-reconciler pods are up and running.

Procedure

Run the following command to create a ConfigMap object named whereabouts-config in the openshift-multus namespace with a specific cron expression for the IP reconciler:
```
oc create configmap whereabouts-config -n openshift-multus --from-literal=reconciler_cron_expression="*/15 * * * *"
```
```
$ oc create configmap whereabouts-config -n openshift-multus --from-literal=reconciler_cron_expression="*/15 * * * *"
```
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This cron expression indicates the IP reconciler runs every 15 minutes. Adjust the expression based on your specific requirements.
Note
The whereabouts-reconciler daemon set can only consume a cron expression pattern that includes five asterisks. The sixth, which is used to denote seconds, is currently not supported.

Retrieve information about resources related to the whereabouts-reconciler daemon set and pods within the openshift-multus namespace by running the following command:

oc get all -n openshift-multus | grep whereabouts-reconciler

$ oc get all -n openshift-multus | grep whereabouts-reconciler

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Example output

pod/whereabouts-reconciler-2p7hw                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-76jk7                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-94zw6                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-mfh68                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-pgshz                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-xn5xz                   1/1     Running   0             4m14s
daemonset.apps/whereabouts-reconciler          6         6         6       6            6           kubernetes.io/os=linux   4m16s

pod/whereabouts-reconciler-2p7hw                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-76jk7                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-94zw6                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-mfh68                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-pgshz                   1/1     Running   0             4m14s
pod/whereabouts-reconciler-xn5xz                   1/1     Running   0             4m14s
daemonset.apps/whereabouts-reconciler          6         6         6       6            6           kubernetes.io/os=linux   4m16s

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Run the following command to verify that the whereabouts-reconciler pod runs the IP reconciler with the configured interval:

oc -n openshift-multus logs whereabouts-reconciler-2p7hw

$ oc -n openshift-multus logs whereabouts-reconciler-2p7hw

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Example output

2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/..2024_02_02_16_33_54.1375928161": CREATE
2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/..2024_02_02_16_33_54.1375928161": CHMOD
2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/..data_tmp": RENAME
2024-02-02T16:33:54Z [verbose] using expression: */15 * * * *
2024-02-02T16:33:54Z [verbose] configuration updated to file "/cron-schedule/..data". New cron expression: */15 * * * *
2024-02-02T16:33:54Z [verbose] successfully updated CRON configuration id "00c2d1c9-631d-403f-bb86-73ad104a6817" - new cron expression: */15 * * * *
2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/config": CREATE
2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/..2024_02_02_16_26_17.3874177937": REMOVE
2024-02-02T16:45:00Z [verbose] starting reconciler run
2024-02-02T16:45:00Z [debug] NewReconcileLooper - inferred connection data
2024-02-02T16:45:00Z [debug] listing IP pools
2024-02-02T16:45:00Z [debug] no IP addresses to cleanup
2024-02-02T16:45:00Z [verbose] reconciler success

2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/..2024_02_02_16_33_54.1375928161": CREATE
2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/..2024_02_02_16_33_54.1375928161": CHMOD
2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/..data_tmp": RENAME
2024-02-02T16:33:54Z [verbose] using expression: */15 * * * *
2024-02-02T16:33:54Z [verbose] configuration updated to file "/cron-schedule/..data". New cron expression: */15 * * * *
2024-02-02T16:33:54Z [verbose] successfully updated CRON configuration id "00c2d1c9-631d-403f-bb86-73ad104a6817" - new cron expression: */15 * * * *
2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/config": CREATE
2024-02-02T16:33:54Z [debug] event not relevant: "/cron-schedule/..2024_02_02_16_26_17.3874177937": REMOVE
2024-02-02T16:45:00Z [verbose] starting reconciler run
2024-02-02T16:45:00Z [debug] NewReconcileLooper - inferred connection data
2024-02-02T16:45:00Z [debug] listing IP pools
2024-02-02T16:45:00Z [debug] no IP addresses to cleanup
2024-02-02T16:45:00Z [verbose] reconciler success

Copy to Clipboard

23.2.6. Creating an additional network attachment with the Cluster Network Operator

The Cluster Network Operator (CNO) manages additional network definitions. When you specify an additional network to create, the CNO creates the NetworkAttachmentDefinition object automatically.

Important

Do not edit the NetworkAttachmentDefinition objects that the Cluster Network Operator manages. Doing so might disrupt network traffic on your additional network.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Optional: Create the namespace for the additional networks:
```
oc create namespace <namespace_name>
```
```
$ oc create namespace <namespace_name>
```
Copy to Clipboard

To edit the CNO configuration, enter the following command:

oc edit networks.operator.openshift.io cluster

$ oc edit networks.operator.openshift.io cluster

Copy to Clipboard

Modify the CR that you are creating by adding the configuration for the additional network that you are creating, as in the following example CR.

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  # ...
  additionalNetworks:
  - name: tertiary-net
    namespace: namespace2
    type: Raw
    rawCNIConfig: |-
      {
        "cniVersion": "0.3.1",
        "name": "tertiary-net",
        "type": "ipvlan",
        "master": "eth1",
        "mode": "l2",
        "ipam": {
          "type": "static",
          "addresses": [
            {
              "address": "192.168.1.23/24"
            }
          ]
        }
      }

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  # ...
  additionalNetworks:
  - name: tertiary-net
    namespace: namespace2
    type: Raw
    rawCNIConfig: |-
      {
        "cniVersion": "0.3.1",
        "name": "tertiary-net",
        "type": "ipvlan",
        "master": "eth1",
        "mode": "l2",
        "ipam": {
          "type": "static",
          "addresses": [
            {
              "address": "192.168.1.23/24"
            }
          ]
        }
      }

Copy to Clipboard

Save your changes and quit the text editor to commit your changes.

Verification

Confirm that the CNO created the NetworkAttachmentDefinition object by running the following command. There might be a delay before the CNO creates the object.
```
oc get network-attachment-definitions -n <namespace>
```
```
$ oc get network-attachment-definitions -n <namespace>
```
Copy to Clipboard
where:
<namespace>
Specifies the namespace for the network attachment that you added to the CNO configuration.
Example output
```
NAME                 AGE
test-network-1       14m
```
```
NAME                 AGE
test-network-1       14m
```
Copy to Clipboard

23.2.7. Creating an additional network attachment by applying a YAML manifest

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create a YAML file with your additional network configuration, such as in the following example:

apiVersion: k8s.cni.cncf.io/v1
kind: NetworkAttachmentDefinition
metadata:
  name: next-net
spec:
  config: |-
    {
      "cniVersion": "0.3.1",
      "name": "work-network",
      "type": "host-device",
      "device": "eth1",
      "ipam": {
        "type": "dhcp"
      }
    }

apiVersion: k8s.cni.cncf.io/v1
kind: NetworkAttachmentDefinition
metadata:
  name: next-net
spec:
  config: |-
    {
      "cniVersion": "0.3.1",
      "name": "work-network",
      "type": "host-device",
      "device": "eth1",
      "ipam": {
        "type": "dhcp"
      }
    }

Copy to Clipboard

To create the additional network, enter the following command:
```
oc apply -f <file>.yaml
```
```
$ oc apply -f <file>.yaml
```
Copy to Clipboard
where:
<file>
Specifies the name of the file contained the YAML manifest.

23.3. About virtual routing and forwarding

23.3.1. About virtual routing and forwarding

Virtual routing and forwarding (VRF) devices combined with IP rules provide the ability to create virtual routing and forwarding domains. VRF reduces the number of permissions needed by CNF, and provides increased visibility of the network topology of secondary networks. VRF is used to provide multi-tenancy functionality, for example, where each tenant has its own unique routing tables and requires different default gateways.

Processes can bind a socket to the VRF device. Packets through the binded socket use the routing table associated with the VRF device. An important feature of VRF is that it impacts only OSI model layer 3 traffic and above so L2 tools, such as LLDP, are not affected. This allows higher priority IP rules such as policy based routing to take precedence over the VRF device rules directing specific traffic.

23.3.1.1. Benefits of secondary networks for pods for telecommunications operators

In telecommunications use cases, each CNF can potentially be connected to multiple different networks sharing the same address space. These secondary networks can potentially conflict with the cluster’s main network CIDR. Using the CNI VRF plugin, network functions can be connected to different customers' infrastructure using the same IP address, keeping different customers isolated. IP addresses are overlapped with OpenShift Container Platform IP space. The CNI VRF plugin also reduces the number of permissions needed by CNF and increases the visibility of network topologies of secondary networks.

23.4. Configuring multi-network policy

As a cluster administrator, you can configure multi-network for additional networks. You can specify multi-network policy for SR-IOV and macvlan additional networks. Macvlan additional networks are fully supported. Other types of additional networks, such as ipvlan, are not supported.

Important

Support for configuring multi-network policies for SR-IOV additional networks is a Technology Preview feature and is only supported with kernel network interface cards (NICs). SR-IOV is not supported for Data Plane Development Kit (DPDK) applications.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

Note

Configured network policies are ignored in IPv6 networks.

23.4.1. Differences between multi-network policy and network policy

Although the MultiNetworkPolicy API implements the NetworkPolicy API, there are several important differences:

You must use the MultiNetworkPolicy API:

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy

Copy to Clipboard

You must use the multi-networkpolicy resource name when using the CLI to interact with multi-network policies. For example, you can view a multi-network policy object with the oc get multi-networkpolicy <name> command where <name> is the name of a multi-network policy.

You must specify an annotation with the name of the network attachment definition that defines the macvlan or SR-IOV additional network:

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>

Copy to Clipboard

where:

<network_name>: Specifies the name of a network attachment definition.

23.4.2. Enabling multi-network policy for the cluster

As a cluster administrator, you can enable multi-network policy support on your cluster.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster with a user with cluster-admin privileges.

Procedure

Create the multinetwork-enable-patch.yaml file with the following YAML:

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  useMultiNetworkPolicy: true

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  useMultiNetworkPolicy: true

Copy to Clipboard

Configure the cluster to enable multi-network policy:

oc patch network.operator.openshift.io cluster --type=merge --patch-file=multinetwork-enable-patch.yaml

$ oc patch network.operator.openshift.io cluster --type=merge --patch-file=multinetwork-enable-patch.yaml

Copy to Clipboard

Example output

network.operator.openshift.io/cluster patched

network.operator.openshift.io/cluster patched

Copy to Clipboard

23.4.3. Working with multi-network policy

As a cluster administrator, you can create, edit, view, and delete multi-network policies.

23.4.3.1. Prerequisites

You have enabled multi-network policy support for your cluster.

23.4.3.2. Creating a multi-network policy using the CLI

To define granular rules describing ingress or egress network traffic allowed for namespaces in your cluster, you can create a multi-network policy.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You are working in the namespace that the multi-network policy applies to.

Procedure

Create a policy rule:

Create a <policy_name>.yaml file:
```
touch <policy_name>.yaml
```
```
$ touch <policy_name>.yaml
```
Copy to Clipboard
where:
<policy_name>
Specifies the multi-network policy file name.

Define a multi-network policy in the file that you just created, such as in the following examples:

Deny ingress from all pods in all namespaces

This is a fundamental policy, blocking all cross-pod networking other than cross-pod traffic allowed by the configuration of other Network Policies.

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: deny-by-default
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
  ingress: []

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: deny-by-default
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
  ingress: []

Copy to Clipboard

where:

<network_name>: Specifies the name of a network attachment definition.

Allow ingress from all pods in the same namespace

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: allow-same-namespace
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
  ingress:
  - from:
    - podSelector: {}

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: allow-same-namespace
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
  ingress:
  - from:
    - podSelector: {}

Copy to Clipboard

where:

<network_name>: Specifies the name of a network attachment definition.

Allow ingress traffic to one pod from a particular namespace

This policy allows traffic to pods labelled pod-a from pods running in namespace-y.

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: allow-traffic-pod
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
   matchLabels:
      pod: pod-a
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
           kubernetes.io/metadata.name: namespace-y

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: allow-traffic-pod
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
   matchLabels:
      pod: pod-a
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
           kubernetes.io/metadata.name: namespace-y

Copy to Clipboard

where:

<network_name>: Specifies the name of a network attachment definition.

Restrict traffic to a service

This policy when applied ensures every pod with both labels app=bookstore and role=api can only be accessed by pods with label app=bookstore. In this example the application could be a REST API server, marked with labels app=bookstore and role=api.

This example addresses the following use cases:

Restricting the traffic to a service to only the other microservices that need to use it.

Restricting the connections to a database to only permit the application using it.

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: api-allow
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
    matchLabels:
      app: bookstore
      role: api
  ingress:
  - from:
      - podSelector:
          matchLabels:
            app: bookstore

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: api-allow
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
    matchLabels:
      app: bookstore
      role: api
  ingress:
  - from:
      - podSelector:
          matchLabels:
            app: bookstore

Copy to Clipboard

where:

<network_name>: Specifies the name of a network attachment definition.

To create the multi-network policy object, enter the following command:
```
oc apply -f <policy_name>.yaml -n <namespace>
```
```
$ oc apply -f <policy_name>.yaml -n <namespace>
```
Copy to Clipboard
where:
<policy_name>
Specifies the multi-network policy file name.
<namespace>
Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
Example output
```
multinetworkpolicy.k8s.cni.cncf.io/deny-by-default created
```
```
multinetworkpolicy.k8s.cni.cncf.io/deny-by-default created
```
Copy to Clipboard

Note

If you log in to the web console with cluster-admin privileges, you have a choice of creating a network policy in any namespace in the cluster directly in YAML or from a form in the web console.

23.4.3.3. Editing a multi-network policy

You can edit a multi-network policy in a namespace.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You are working in the namespace where the multi-network policy exists.

Procedure

Optional: To list the multi-network policy objects in a namespace, enter the following command:
```
oc get multi-networkpolicy
```
```
$ oc get multi-networkpolicy
```
Copy to Clipboard
where:
<namespace>
Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
Edit the multi-network policy object.
- If you saved the multi-network policy definition in a file, edit the file and make any necessary changes, and then enter the following command.
  $ oc apply -n <namespace> -f <policy_file>.yaml
  Copy to Clipboard
  where:
  <namespace>
  Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
  <policy_file>
  Specifies the name of the file containing the network policy.
- If you need to update the multi-network policy object directly, enter the following command:
  $ oc edit multi-networkpolicy <policy_name> -n <namespace>
  Copy to Clipboard
  where:
  <policy_name>
  Specifies the name of the network policy.
  <namespace>
  Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
Confirm that the multi-network policy object is updated.
```
oc describe multi-networkpolicy <policy_name> -n <namespace>
```
```
$ oc describe multi-networkpolicy <policy_name> -n <namespace>
```
Copy to Clipboard
where:
<policy_name>
Specifies the name of the multi-network policy.
<namespace>
Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

Note

If you log in to the web console with cluster-admin privileges, you have a choice of editing a network policy in any namespace in the cluster directly in YAML or from the policy in the web console through the Actions menu.

23.4.3.4. Viewing multi-network policies using the CLI

You can examine the multi-network policies in a namespace.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You are working in the namespace where the multi-network policy exists.

Procedure

List multi-network policies in a namespace:
- To view multi-network policy objects defined in a namespace, enter the following command:
  $ oc get multi-networkpolicy
  Copy to Clipboard
- Optional: To examine a specific multi-network policy, enter the following command:
  $ oc describe multi-networkpolicy <policy_name> -n <namespace>
  Copy to Clipboard
  where:
  <policy_name>
  Specifies the name of the multi-network policy to inspect.
  <namespace>
  Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.

Note

If you log in to the web console with cluster-admin privileges, you have a choice of viewing a network policy in any namespace in the cluster directly in YAML or from a form in the web console.

23.4.3.5. Deleting a multi-network policy using the CLI

You can delete a multi-network policy in a namespace.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You are working in the namespace where the multi-network policy exists.

Procedure

To delete a multi-network policy object, enter the following command:
```
oc delete multi-networkpolicy <policy_name> -n <namespace>
```
```
$ oc delete multi-networkpolicy <policy_name> -n <namespace>
```
Copy to Clipboard
where:
<policy_name>
Specifies the name of the multi-network policy.
<namespace>
Optional: Specifies the namespace if the object is defined in a different namespace than the current namespace.
Example output
```
multinetworkpolicy.k8s.cni.cncf.io/default-deny deleted
```
```
multinetworkpolicy.k8s.cni.cncf.io/default-deny deleted
```
Copy to Clipboard

Note

If you log in to the web console with cluster-admin privileges, you have a choice of deleting a network policy in any namespace in the cluster directly in YAML or from the policy in the web console through the Actions menu.

23.4.3.6. Creating a default deny all multi-network policy

This is a fundamental policy, blocking all cross-pod networking other than network traffic allowed by the configuration of other deployed network policies. This procedure enforces a default deny-by-default policy.

Note

If you log in with a user with the cluster-admin role, then you can create a network policy in any namespace in the cluster.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You are working in the namespace that the multi-network policy applies to.

Procedure

Create the following YAML that defines a deny-by-default policy to deny ingress from all pods in all namespaces. Save the YAML in the deny-by-default.yaml file:
```
apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: deny-by-default
  namespace: default 
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name> 
spec:
  podSelector: {} 
  ingress: [] 
```
```
apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: deny-by-default
  namespace: default 
```
1
```
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name> 
```
2
```
spec:
  podSelector: {} 
```
3
```
  ingress: [] 
```
4
Copy to Clipboard
1
namespace: default deploys this policy to the default namespace.
2
network_name: specifies the name of a network attachment definition.
3
podSelector: is empty, this means it matches all the pods. Therefore, the policy applies to all pods in the default namespace.
4
There are no ingress rules specified. This causes incoming traffic to be dropped to all pods.

Apply the policy by entering the following command:

oc apply -f deny-by-default.yaml

$ oc apply -f deny-by-default.yaml

Copy to Clipboard

Example output

multinetworkpolicy.k8s.cni.cncf.io/deny-by-default created

multinetworkpolicy.k8s.cni.cncf.io/deny-by-default created

Copy to Clipboard

23.4.3.7. Creating a multi-network policy to allow traffic from external clients

With the deny-by-default policy in place you can proceed to configure a policy that allows traffic from external clients to a pod with the label app=web.

Note

If you log in with a user with the cluster-admin role, then you can create a network policy in any namespace in the cluster.

Follow this procedure to configure a policy that allows external service from the public Internet directly or by using a Load Balancer to access the pod. Traffic is only allowed to a pod with the label app=web.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You are working in the namespace that the multi-network policy applies to.

Procedure

Create a policy that allows traffic from the public Internet directly or by using a load balancer to access the pod. Save the YAML in the web-allow-external.yaml file:

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: web-allow-external
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  policyTypes:
  - Ingress
  podSelector:
    matchLabels:
      app: web
  ingress:
    - {}

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: web-allow-external
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  policyTypes:
  - Ingress
  podSelector:
    matchLabels:
      app: web
  ingress:
    - {}

Copy to Clipboard

Apply the policy by entering the following command:

oc apply -f web-allow-external.yaml

$ oc apply -f web-allow-external.yaml

Copy to Clipboard

Example output

multinetworkpolicy.k8s.cni.cncf.io/web-allow-external created

multinetworkpolicy.k8s.cni.cncf.io/web-allow-external created

Copy to Clipboard

This policy allows traffic from all resources, including external traffic as illustrated in the following diagram:

23.4.3.8. Creating a multi-network policy allowing traffic to an application from all namespaces

Note

If you log in with a user with the cluster-admin role, then you can create a network policy in any namespace in the cluster.

Follow this procedure to configure a policy that allows traffic from all pods in all namespaces to a particular application.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You are working in the namespace that the multi-network policy applies to.

Procedure

Create a policy that allows traffic from all pods in all namespaces to a particular application. Save the YAML in the web-allow-all-namespaces.yaml file:

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: web-allow-all-namespaces
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
    matchLabels:
      app: web 
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector: {}

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: web-allow-all-namespaces
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
    matchLabels:
      app: web

1


  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector: {}

2

Copy to Clipboard

1: Applies the policy only to app:web pods in default namespace.
2: Selects all pods in all namespaces.

Note

By default, if you omit specifying a namespaceSelector it does not select any namespaces, which means the policy allows traffic only from the namespace the network policy is deployed to.

Apply the policy by entering the following command:

oc apply -f web-allow-all-namespaces.yaml

$ oc apply -f web-allow-all-namespaces.yaml

Copy to Clipboard

Example output

multinetworkpolicy.k8s.cni.cncf.io/web-allow-all-namespaces created

multinetworkpolicy.k8s.cni.cncf.io/web-allow-all-namespaces created

Copy to Clipboard

Verification

Start a web service in the default namespace by entering the following command:

oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

$ oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

Copy to Clipboard

Run the following command to deploy an alpine image in the secondary namespace and to start a shell:

oc run test-$RANDOM --namespace=secondary --rm -i -t --image=alpine -- sh

$ oc run test-$RANDOM --namespace=secondary --rm -i -t --image=alpine -- sh

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Run the following command in the shell and observe that the request is allowed:

wget -qO- --timeout=2 http://web.default

# wget -qO- --timeout=2 http://web.default

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Expected output

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

Copy to Clipboard

23.4.3.9. Creating a multi-network policy allowing traffic to an application from a namespace

Note

If you log in with a user with the cluster-admin role, then you can create a network policy in any namespace in the cluster.

Follow this procedure to configure a policy that allows traffic to a pod with the label app=web from a particular namespace. You might want to do this to:

Restrict traffic to a production database only to namespaces where production workloads are deployed.
Enable monitoring tools deployed to a particular namespace to scrape metrics from the current namespace.

Prerequisites

Your cluster uses a network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes network plugin or the OpenShift SDN network plugin with mode: NetworkPolicy set. This mode is the default for OpenShift SDN.
You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You are working in the namespace that the multi-network policy applies to.

Procedure

Create a policy that allows traffic from all pods in a particular namespaces with a label purpose=production. Save the YAML in the web-allow-prod.yaml file:

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: web-allow-prod
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
    matchLabels:
      app: web 
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          purpose: production

apiVersion: k8s.cni.cncf.io/v1beta1
kind: MultiNetworkPolicy
metadata:
  name: web-allow-prod
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/policy-for: <network_name>
spec:
  podSelector:
    matchLabels:
      app: web

1


  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          purpose: production

2

Copy to Clipboard

1: Applies the policy only to app:web pods in the default namespace.
2: Restricts traffic to only pods in namespaces that have the label purpose=production.

Apply the policy by entering the following command:

oc apply -f web-allow-prod.yaml

$ oc apply -f web-allow-prod.yaml

Copy to Clipboard

Example output

multinetworkpolicy.k8s.cni.cncf.io/web-allow-prod created

multinetworkpolicy.k8s.cni.cncf.io/web-allow-prod created

Copy to Clipboard

Verification

Start a web service in the default namespace by entering the following command:

oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

$ oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

Copy to Clipboard

Run the following command to create the prod namespace:
```
oc create namespace prod
```
```
$ oc create namespace prod
```
Copy to Clipboard

Run the following command to label the prod namespace:

oc label namespace/prod purpose=production

$ oc label namespace/prod purpose=production

Copy to Clipboard

Run the following command to create the dev namespace:
```
oc create namespace dev
```
```
$ oc create namespace dev
```
Copy to Clipboard

Run the following command to label the dev namespace:

oc label namespace/dev purpose=testing

$ oc label namespace/dev purpose=testing

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Run the following command to deploy an alpine image in the dev namespace and to start a shell:

oc run test-$RANDOM --namespace=dev --rm -i -t --image=alpine -- sh

$ oc run test-$RANDOM --namespace=dev --rm -i -t --image=alpine -- sh

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Run the following command in the shell and observe that the request is blocked:
```
wget -qO- --timeout=2 http://web.default
```
```
# wget -qO- --timeout=2 http://web.default
```
Copy to Clipboard
Expected output
```
wget: download timed out
```
```
wget: download timed out
```
Copy to Clipboard

Run the following command to deploy an alpine image in the prod namespace and start a shell:

oc run test-$RANDOM --namespace=prod --rm -i -t --image=alpine -- sh

$ oc run test-$RANDOM --namespace=prod --rm -i -t --image=alpine -- sh

Copy to Clipboard

Run the following command in the shell and observe that the request is allowed:

wget -qO- --timeout=2 http://web.default

# wget -qO- --timeout=2 http://web.default

Copy to Clipboard

Expected output

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

Copy to Clipboard

23.5. Attaching a pod to an additional network

As a cluster user you can attach a pod to an additional network.

23.5.1. Adding a pod to an additional network

You can add a pod to an additional network. The pod continues to send normal cluster-related network traffic over the default network.

When a pod is created additional networks are attached to it. However, if a pod already exists, you cannot attach additional networks to it.

The pod must be in the same namespace as the additional network.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster.

Procedure

Add an annotation to the Pod object. Only one of the following annotation formats can be used:
1. To attach an additional network without any customization, add an annotation with the following format. Replace <network> with the name of the additional network to associate with the pod:
  metadata: annotations: k8s.v1.cni.cncf.io/networks: <network>[,<network>,...]
  1
  Copy to Clipboard
  1
  To specify more than one additional network, separate each network with a comma. Do not include whitespace between the comma. If you specify the same additional network multiple times, that pod will have multiple network interfaces attached to that network.
2. To attach an additional network with customizations, add an annotation with the following format:
  metadata: annotations: k8s.v1.cni.cncf.io/networks: |- [ { "name": "<network>",
  1
  "namespace": "<namespace>",
  2
  "default-route": ["<default-route>"]
  3
  } ]
  Copy to Clipboard
  1
  Specify the name of the additional network defined by a NetworkAttachmentDefinition object.
  2
  Specify the namespace where the NetworkAttachmentDefinition object is defined.
  3
  Optional: Specify an override for the default route, such as 192.168.17.1.
To create the pod, enter the following command. Replace <name> with the name of the pod.
```
oc create -f <name>.yaml
```
```
$ oc create -f <name>.yaml
```
Copy to Clipboard

Optional: To Confirm that the annotation exists in the Pod CR, enter the following command, replacing <name> with the name of the pod.

oc get pod <name> -o yaml

$ oc get pod <name> -o yaml

Copy to Clipboard

In the following example, the example-pod pod is attached to the net1 additional network:

oc get pod example-pod -o yaml

$ oc get pod example-pod -o yaml
apiVersion: v1
kind: Pod
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: macvlan-bridge
    k8s.v1.cni.cncf.io/network-status: |-

1


      [{
          "name": "openshift-sdn",
          "interface": "eth0",
          "ips": [
              "10.128.2.14"
          ],
          "default": true,
          "dns": {}
      },{
          "name": "macvlan-bridge",
          "interface": "net1",
          "ips": [
              "20.2.2.100"
          ],
          "mac": "22:2f:60:a5:f8:00",
          "dns": {}
      }]
  name: example-pod
  namespace: default
spec:
  ...
status:
  ...

Copy to Clipboard

1: The k8s.v1.cni.cncf.io/network-status parameter is a JSON array of objects. Each object describes the status of an additional network attached to the pod. The annotation value is stored as a plain text value.

23.5.1.1. Specifying pod-specific addressing and routing options

When attaching a pod to an additional network, you may want to specify further properties about that network in a particular pod. This allows you to change some aspects of routing, as well as specify static IP addresses and MAC addresses. To accomplish this, you can use the JSON formatted annotations.

Prerequisites

The pod must be in the same namespace as the additional network.
Install the OpenShift CLI (oc).
You must log in to the cluster.

Procedure

To add a pod to an additional network while specifying addressing and/or routing options, complete the following steps:

Edit the Pod resource definition. If you are editing an existing Pod resource, run the following command to edit its definition in the default editor. Replace <name> with the name of the Pod resource to edit.
```
oc edit pod <name>
```
```
$ oc edit pod <name>
```
Copy to Clipboard
In the Pod resource definition, add the k8s.v1.cni.cncf.io/networks parameter to the pod metadata mapping. The k8s.v1.cni.cncf.io/networks accepts a JSON string of a list of objects that reference the name of NetworkAttachmentDefinition custom resource (CR) names in addition to specifying additional properties.
```
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: '[<network>[,<network>,...]]' 
```
```
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: '[<network>[,<network>,...]]' 
```
1
Copy to Clipboard
1
Replace <network> with a JSON object as shown in the following examples. The single quotes are required.

In the following example the annotation specifies which network attachment will have the default route, using the default-route parameter.

apiVersion: v1
kind: Pod
metadata:
  name: example-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
    {
      "name": "net1"
    },
    {
      "name": "net2", 
      "default-route": ["192.0.2.1"] 
    }]'
spec:
  containers:
  - name: example-pod
    command: ["/bin/bash", "-c", "sleep 2000000000000"]
    image: centos/tools

apiVersion: v1
kind: Pod
metadata:
  name: example-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
    {
      "name": "net1"
    },
    {
      "name": "net2",

1


      "default-route": ["192.0.2.1"]

2


    }]'
spec:
  containers:
  - name: example-pod
    command: ["/bin/bash", "-c", "sleep 2000000000000"]
    image: centos/tools

Copy to Clipboard

1: The name key is the name of the additional network to associate with the pod.
2: The default-route key specifies a value of a gateway for traffic to be routed over if no other routing entry is present in the routing table. If more than one default-route key is specified, this will cause the pod to fail to become active.

The default route will cause any traffic that is not specified in other routes to be routed to the gateway.

Important

Setting the default route to an interface other than the default network interface for OpenShift Container Platform may cause traffic that is anticipated for pod-to-pod traffic to be routed over another interface.

To verify the routing properties of a pod, the oc command may be used to execute the ip command within a pod.

oc exec -it <pod_name> -- ip route

$ oc exec -it <pod_name> -- ip route

Copy to Clipboard

Note

You may also reference the pod’s k8s.v1.cni.cncf.io/network-status to see which additional network has been assigned the default route, by the presence of the default-route key in the JSON-formatted list of objects.

To set a static IP address or MAC address for a pod you can use the JSON formatted annotations. This requires you create networks that specifically allow for this functionality. This can be specified in a rawCNIConfig for the CNO.

Edit the CNO CR by running the following command:

oc edit networks.operator.openshift.io cluster

$ oc edit networks.operator.openshift.io cluster

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The following YAML describes the configuration parameters for the CNO:

Cluster Network Operator YAML configuration

name: <name> 
namespace: <namespace> 
rawCNIConfig: '{ 
  ...
}'
type: Raw

name: <name>

1


namespace: <namespace>

2


rawCNIConfig: '{

3


  ...
}'
type: Raw

Copy to Clipboard

1: Specify a name for the additional network attachment that you are creating. The name must be unique within the specified namespace.
2: Specify the namespace to create the network attachment in. If you do not specify a value, then the default namespace is used.
3: Specify the CNI plugin configuration in JSON format, which is based on the following template.

The following object describes the configuration parameters for utilizing static MAC address and IP address using the macvlan CNI plugin:

macvlan CNI plugin JSON configuration object using static IP and MAC address

{
  "cniVersion": "0.3.1",
  "name": "<name>", 
  "plugins": [{ 
      "type": "macvlan",
      "capabilities": { "ips": true }, 
      "master": "eth0", 
      "mode": "bridge",
      "ipam": {
        "type": "static"
      }
    }, {
      "capabilities": { "mac": true }, 
      "type": "tuning"
    }]
}

{
  "cniVersion": "0.3.1",
  "name": "<name>",

1


  "plugins": [{

2


      "type": "macvlan",
      "capabilities": { "ips": true },

3


      "master": "eth0",

4


      "mode": "bridge",
      "ipam": {
        "type": "static"
      }
    }, {
      "capabilities": { "mac": true },

5


      "type": "tuning"
    }]
}

Copy to Clipboard

1: Specifies the name for the additional network attachment to create. The name must be unique within the specified namespace.
2: Specifies an array of CNI plugin configurations. The first object specifies a macvlan plugin configuration and the second object specifies a tuning plugin configuration.
3: Specifies that a request is made to enable the static IP address functionality of the CNI plugin runtime configuration capabilities.
4: Specifies the interface that the macvlan plugin uses.
5: Specifies that a request is made to enable the static MAC address functionality of a CNI plugin.

The above network attachment can be referenced in a JSON formatted annotation, along with keys to specify which static IP and MAC address will be assigned to a given pod.

Edit the pod with:

oc edit pod <name>

$ oc edit pod <name>

Copy to Clipboard

macvlan CNI plugin JSON configuration object using static IP and MAC address

apiVersion: v1
kind: Pod
metadata:
  name: example-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
      {
        "name": "<name>", 
        "ips": [ "192.0.2.205/24" ], 
        "mac": "CA:FE:C0:FF:EE:00" 
      }
    ]'

apiVersion: v1
kind: Pod
metadata:
  name: example-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: '[
      {
        "name": "<name>",

1


        "ips": [ "192.0.2.205/24" ],

2


        "mac": "CA:FE:C0:FF:EE:00"

3


      }
    ]'

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1: Use the <name> as provided when creating the rawCNIConfig above.
2: Provide an IP address including the subnet mask.
3: Provide the MAC address.

Note

Static IP addresses and MAC addresses do not have to be used at the same time, you may use them individually, or together.

To verify the IP address and MAC properties of a pod with additional networks, use the oc command to execute the ip command within a pod.

oc exec -it <pod_name> -- ip a

$ oc exec -it <pod_name> -- ip a

Copy to Clipboard

23.6. Removing a pod from an additional network

As a cluster user you can remove a pod from an additional network.

23.6.1. Removing a pod from an additional network

You can remove a pod from an additional network only by deleting the pod.

Prerequisites

An additional network is attached to the pod.
Install the OpenShift CLI (oc).
Log in to the cluster.

Procedure

To delete the pod, enter the following command:
```
oc delete pod <name> -n <namespace>
```
```
$ oc delete pod <name> -n <namespace>
```
Copy to Clipboard
- <name> is the name of the pod.
- <namespace> is the namespace that contains the pod.

23.7. Editing an additional network

As a cluster administrator you can modify the configuration for an existing additional network.

23.7.1. Modifying an additional network attachment definition

As a cluster administrator, you can make changes to an existing additional network. Any existing pods attached to the additional network will not be updated.

Prerequisites

You have configured an additional network for your cluster.
Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

To edit an additional network for your cluster, complete the following steps:

Run the following command to edit the Cluster Network Operator (CNO) CR in your default text editor:
```
oc edit networks.operator.openshift.io cluster
```
```
$ oc edit networks.operator.openshift.io cluster
```
Copy to Clipboard
In the additionalNetworks collection, update the additional network with your changes.
Save your changes and quit the text editor to commit your changes.

Optional: Confirm that the CNO updated the NetworkAttachmentDefinition object by running the following command. Replace <network-name> with the name of the additional network to display. There might be a delay before the CNO updates the NetworkAttachmentDefinition object to reflect your changes.

oc get network-attachment-definitions <network-name> -o yaml

$ oc get network-attachment-definitions <network-name> -o yaml

Copy to Clipboard

For example, the following console output displays a NetworkAttachmentDefinition object that is named net1:

oc get network-attachment-definitions net1 -o go-template='{{printf "%s\n" .spec.config}}'

$ oc get network-attachment-definitions net1 -o go-template='{{printf "%s\n" .spec.config}}'
{ "cniVersion": "0.3.1", "type": "macvlan",
"master": "ens5",
"mode": "bridge",
"ipam":       {"type":"static","routes":[{"dst":"0.0.0.0/0","gw":"10.128.2.1"}],"addresses":[{"address":"10.128.2.100/23","gateway":"10.128.2.1"}],"dns":{"nameservers":["172.30.0.10"],"domain":"us-west-2.compute.internal","search":["us-west-2.compute.internal"]}} }

Copy to Clipboard

23.8. Removing an additional network

As a cluster administrator you can remove an additional network attachment.

23.8.1. Removing an additional network attachment definition

As a cluster administrator, you can remove an additional network from your OpenShift Container Platform cluster. The additional network is not removed from any pods it is attached to.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

To remove an additional network from your cluster, complete the following steps:

Edit the Cluster Network Operator (CNO) in your default text editor by running the following command:
```
oc edit networks.operator.openshift.io cluster
```
```
$ oc edit networks.operator.openshift.io cluster
```
Copy to Clipboard
Modify the CR by removing the configuration from the additionalNetworks collection for the network attachment definition you are removing.
```
apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks: [] 
```
```
apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks: [] 
```
1
Copy to Clipboard
1
If you are removing the configuration mapping for the only additional network attachment definition in the additionalNetworks collection, you must specify an empty collection.
Save your changes and quit the text editor to commit your changes.
Optional: Confirm that the additional network CR was deleted by running the following command:
```
oc get network-attachment-definition --all-namespaces
```
```
$ oc get network-attachment-definition --all-namespaces
```
Copy to Clipboard

23.9. Assigning a secondary network to a VRF

As a cluster administrator, you can configure an additional network for a virtual routing and forwarding (VRF) domain by using the CNI VRF plugin. The virtual network that this plugin creates is associated with the physical interface that you specify.

Using a secondary network with a VRF instance has the following advantages:

Workload isolation: Isolate workload traffic by configuring a VRF instance for the additional network.
Improved security: Enable improved security through isolated network paths in the VRF domain.
Multi-tenancy support: Support multi-tenancy through network segmentation with a unique routing table in the VRF domain for each tenant.

Note

Applications that use VRFs must bind to a specific device. The common usage is to use the SO_BINDTODEVICE option for a socket. The SO_BINDTODEVICE option binds the socket to the device that is specified in the passed interface name, for example, eth1. To use the SO_BINDTODEVICE option, the application must have CAP_NET_RAW capabilities.

Using a VRF through the ip vrf exec command is not supported in OpenShift Container Platform pods. To use VRF, bind applications directly to the VRF interface.

23.9.1. Creating an additional network attachment with the CNI VRF plugin

The Cluster Network Operator (CNO) manages additional network definitions. When you specify an additional network to create, the CNO creates the NetworkAttachmentDefinition custom resource (CR) automatically.

Note

Do not edit the NetworkAttachmentDefinition CRs that the Cluster Network Operator manages. Doing so might disrupt network traffic on your additional network.

To create an additional network attachment with the CNI VRF plugin, perform the following procedure.

Prerequisites

Install the OpenShift Container Platform CLI (oc).
Log in to the OpenShift cluster as a user with cluster-admin privileges.

Procedure

Create the Network custom resource (CR) for the additional network attachment and insert the rawCNIConfig configuration for the additional network, as in the following example CR. Save the YAML as the file additional-network-attachment.yaml.

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks:
    - name: test-network-1
      namespace: additional-network-1
      type: Raw
      rawCNIConfig: '{
        "cniVersion": "0.3.1",
        "name": "macvlan-vrf",
        "plugins": [  
        {
          "type": "macvlan",
          "master": "eth1",
          "ipam": {
              "type": "static",
              "addresses": [
              {
                  "address": "191.168.1.23/24"
              }
              ]
          }
        },
        {
          "type": "vrf", 
          "vrfname": "vrf-1",  
          "table": 1001   
        }]
      }'

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks:
    - name: test-network-1
      namespace: additional-network-1
      type: Raw
      rawCNIConfig: '{
        "cniVersion": "0.3.1",
        "name": "macvlan-vrf",
        "plugins": [

1


        {
          "type": "macvlan",
          "master": "eth1",
          "ipam": {
              "type": "static",
              "addresses": [
              {
                  "address": "191.168.1.23/24"
              }
              ]
          }
        },
        {
          "type": "vrf",

2


          "vrfname": "vrf-1",

3


          "table": 1001

4


        }]
      }'

Copy to Clipboard

1: plugins must be a list. The first item in the list must be the secondary network underpinning the VRF network. The second item in the list is the VRF plugin configuration.
2: type must be set to vrf.
3: vrfname is the name of the VRF that the interface is assigned to. If it does not exist in the pod, it is created.
4: Optional. table is the routing table ID. By default, the tableid parameter is used. If it is not specified, the CNI assigns a free routing table ID to the VRF.

Note

VRF functions correctly only when the resource is of type netdevice.

Create the Network resource:

oc create -f additional-network-attachment.yaml

$ oc create -f additional-network-attachment.yaml

Copy to Clipboard

Confirm that the CNO created the NetworkAttachmentDefinition CR by running the following command. Replace <namespace> with the namespace that you specified when configuring the network attachment, for example, additional-network-1.
```
oc get network-attachment-definitions -n <namespace>
```
```
$ oc get network-attachment-definitions -n <namespace>
```
Copy to Clipboard
Example output
```
NAME                       AGE
additional-network-1       14m
```
```
NAME                       AGE
additional-network-1       14m
```
Copy to Clipboard
Note
There might be a delay before the CNO creates the CR.

Verification

Create a pod and assign it to the additional network with the VRF instance:

Create a YAML file that defines the Pod resource:

Example pod-additional-net.yaml file

apiVersion: v1
kind: Pod
metadata:
 name: pod-additional-net
 annotations:
   k8s.v1.cni.cncf.io/networks: '[
       {
               "name": "test-network-1" 
       }
 ]'
spec:
 containers:
 - name: example-pod-1
   command: ["/bin/bash", "-c", "sleep 9000000"]
   image: centos:8

apiVersion: v1
kind: Pod
metadata:
 name: pod-additional-net
 annotations:
   k8s.v1.cni.cncf.io/networks: '[
       {
               "name": "test-network-1"

1


       }
 ]'
spec:
 containers:
 - name: example-pod-1
   command: ["/bin/bash", "-c", "sleep 9000000"]
   image: centos:8

Copy to Clipboard

1: Specify the name of the additional network with the VRF instance.

Create the Pod resource by running the following command:

oc create -f pod-additional-net.yaml

$ oc create -f pod-additional-net.yaml

Copy to Clipboard

Example output

pod/test-pod created

pod/test-pod created

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Verify that the pod network attachment is connected to the VRF additional network. Start a remote session with the pod and run the following command:
```
ip vrf show
```
```
$ ip vrf show
```
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Example output
```
Name              Table
-----------------------
vrf-1             1001
```
```
Name              Table
-----------------------
vrf-1             1001
```
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Confirm that the VRF interface is the controller for the additional interface:

ip link

$ ip link

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Example output

5: net1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master red state UP mode

5: net1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master red state UP mode

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Chapter 24. Hardware networks

24.1. About Single Root I/O Virtualization (SR-IOV) hardware networks

The Single Root I/O Virtualization (SR-IOV) specification is a standard for a type of PCI device assignment that can share a single device with multiple pods.

SR-IOV can segment a compliant network device, recognized on the host node as a physical function (PF), into multiple virtual functions (VFs). The VF is used like any other network device. The SR-IOV network device driver for the device determines how the VF is exposed in the container:

netdevice driver: A regular kernel network device in the netns of the container
vfio-pci driver: A character device mounted in the container

You can use SR-IOV network devices with additional networks on your OpenShift Container Platform cluster installed on bare metal or Red Hat OpenStack Platform (RHOSP) infrastructure for applications that require high bandwidth or low latency.

You can configure multi-network policies for SR-IOV networks. The support for this is technology preview and SR-IOV additional networks are only supported with kernel NICs. They are not supported for Data Plane Development Kit (DPDK) applications.

Note

Creating multi-network policies on SR-IOV networks might not deliver the same performance to applications compared to SR-IOV networks without a multi-network policy configured.

Important

Multi-network policies for SR-IOV network is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

You can enable SR-IOV on a node by using the following command:

oc label node <node_name> feature.node.kubernetes.io/network-sriov.capable="true"

$ oc label node <node_name> feature.node.kubernetes.io/network-sriov.capable="true"

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24.1.1. Components that manage SR-IOV network devices

The SR-IOV Network Operator creates and manages the components of the SR-IOV stack. It performs the following functions:

Orchestrates discovery and management of SR-IOV network devices
Generates NetworkAttachmentDefinition custom resources for the SR-IOV Container Network Interface (CNI)
Creates and updates the configuration of the SR-IOV network device plugin
Creates node specific SriovNetworkNodeState custom resources
Updates the spec.interfaces field in each SriovNetworkNodeState custom resource

The Operator provisions the following components:

SR-IOV network configuration daemon: A daemon set that is deployed on worker nodes when the SR-IOV Network Operator starts. The daemon is responsible for discovering and initializing SR-IOV network devices in the cluster.
SR-IOV Network Operator webhook: A dynamic admission controller webhook that validates the Operator custom resource and sets appropriate default values for unset fields.
SR-IOV Network resources injector: A dynamic admission controller webhook that provides functionality for patching Kubernetes pod specifications with requests and limits for custom network resources such as SR-IOV VFs. The SR-IOV network resources injector adds the resource field to only the first container in a pod automatically.
SR-IOV network device plugin: A device plugin that discovers, advertises, and allocates SR-IOV network virtual function (VF) resources. Device plugins are used in Kubernetes to enable the use of limited resources, typically in physical devices. Device plugins give the Kubernetes scheduler awareness of resource availability, so that the scheduler can schedule pods on nodes with sufficient resources.
SR-IOV CNI plugin: A CNI plugin that attaches VF interfaces allocated from the SR-IOV network device plugin directly into a pod.
SR-IOV InfiniBand CNI plugin: A CNI plugin that attaches InfiniBand (IB) VF interfaces allocated from the SR-IOV network device plugin directly into a pod.

Note

The SR-IOV Network resources injector and SR-IOV Network Operator webhook are enabled by default and can be disabled by editing the default SriovOperatorConfig CR. Use caution when disabling the SR-IOV Network Operator Admission Controller webhook. You can disable the webhook under specific circumstances, such as troubleshooting, or if you want to use unsupported devices.

24.1.1.1. Supported platforms

The SR-IOV Network Operator is supported on the following platforms:

Bare metal
Red Hat OpenStack Platform (RHOSP)

24.1.1.2. Supported devices

OpenShift Container Platform supports the following network interface controllers:

Table 24.1. Supported network interface controllers
Manufacturer	Model	Vendor ID	Device ID
Broadcom	BCM57414	14e4	16d7
Broadcom	BCM57508	14e4	1750
Broadcom	BCM57504	14e4	1751
Intel	X710	8086	1572
Intel	XL710	8086	1583
Intel	X710 Base T	8086	15ff
Intel	XXV710	8086	158b
Intel	E810-CQDA2	8086	1592
Intel	E810-2CQDA2	8086	1592
Intel	E810-XXVDA2	8086	159b
Intel	E810-XXVDA4	8086	1593
Intel	E810-XXVDA4T	8086	1593
Mellanox	MT27700 Family [ConnectX‑4]	15b3	1013
Mellanox	MT27710 Family [ConnectX‑4 Lx]	15b3	1015
Mellanox	MT27800 Family [ConnectX‑5]	15b3	1017
Mellanox	MT28880 Family [ConnectX‑5 Ex]	15b3	1019
Mellanox	MT28908 Family [ConnectX‑6]	15b3	101b
Mellanox	MT2892 Family [ConnectX‑6 Dx]	15b3	101d
Mellanox	MT2894 Family [ConnectX‑6 Lx]	15b3	101f
Mellanox	MT42822 BlueField‑2 in ConnectX‑6 NIC mode	15b3	a2d6
Pensando ^[1]	DSC-25 dual-port 25G distributed services card for ionic driver	0x1dd8	0x1002
Pensando ^[1]	DSC-100 dual-port 100G distributed services card for ionic driver	0x1dd8	0x1003
Silicom	STS Family	8086	1591

OpenShift SR-IOV is supported, but you must set a static, Virtual Function (VF) media access control (MAC) address using the SR-IOV CNI config file when using SR-IOV.

Note

For the most up-to-date list of supported cards and compatible OpenShift Container Platform versions available, see Openshift Single Root I/O Virtualization (SR-IOV) and PTP hardware networks Support Matrix.

24.1.1.3. Automated discovery of SR-IOV network devices

The SR-IOV Network Operator searches your cluster for SR-IOV capable network devices on worker nodes. The Operator creates and updates a SriovNetworkNodeState custom resource (CR) for each worker node that provides a compatible SR-IOV network device.

The CR is assigned the same name as the worker node. The status.interfaces list provides information about the network devices on a node.

Important

Do not modify a SriovNetworkNodeState object. The Operator creates and manages these resources automatically.

24.1.1.3.1. Example SriovNetworkNodeState object

The following YAML is an example of a SriovNetworkNodeState object created by the SR-IOV Network Operator:

An SriovNetworkNodeState object

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodeState
metadata:
  name: node-25 
  namespace: openshift-sriov-network-operator
  ownerReferences:
  - apiVersion: sriovnetwork.openshift.io/v1
    blockOwnerDeletion: true
    controller: true
    kind: SriovNetworkNodePolicy
    name: default
spec:
  dpConfigVersion: "39824"
status:
  interfaces: 
  - deviceID: "1017"
    driver: mlx5_core
    mtu: 1500
    name: ens785f0
    pciAddress: "0000:18:00.0"
    totalvfs: 8
    vendor: 15b3
  - deviceID: "1017"
    driver: mlx5_core
    mtu: 1500
    name: ens785f1
    pciAddress: "0000:18:00.1"
    totalvfs: 8
    vendor: 15b3
  - deviceID: 158b
    driver: i40e
    mtu: 1500
    name: ens817f0
    pciAddress: 0000:81:00.0
    totalvfs: 64
    vendor: "8086"
  - deviceID: 158b
    driver: i40e
    mtu: 1500
    name: ens817f1
    pciAddress: 0000:81:00.1
    totalvfs: 64
    vendor: "8086"
  - deviceID: 158b
    driver: i40e
    mtu: 1500
    name: ens803f0
    pciAddress: 0000:86:00.0
    totalvfs: 64
    vendor: "8086"
  syncStatus: Succeeded

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodeState
metadata:
  name: node-25

1


  namespace: openshift-sriov-network-operator
  ownerReferences:
  - apiVersion: sriovnetwork.openshift.io/v1
    blockOwnerDeletion: true
    controller: true
    kind: SriovNetworkNodePolicy
    name: default
spec:
  dpConfigVersion: "39824"
status:
  interfaces:

2


  - deviceID: "1017"
    driver: mlx5_core
    mtu: 1500
    name: ens785f0
    pciAddress: "0000:18:00.0"
    totalvfs: 8
    vendor: 15b3
  - deviceID: "1017"
    driver: mlx5_core
    mtu: 1500
    name: ens785f1
    pciAddress: "0000:18:00.1"
    totalvfs: 8
    vendor: 15b3
  - deviceID: 158b
    driver: i40e
    mtu: 1500
    name: ens817f0
    pciAddress: 0000:81:00.0
    totalvfs: 64
    vendor: "8086"
  - deviceID: 158b
    driver: i40e
    mtu: 1500
    name: ens817f1
    pciAddress: 0000:81:00.1
    totalvfs: 64
    vendor: "8086"
  - deviceID: 158b
    driver: i40e
    mtu: 1500
    name: ens803f0
    pciAddress: 0000:86:00.0
    totalvfs: 64
    vendor: "8086"
  syncStatus: Succeeded

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1: The value of the name field is the same as the name of the worker node.
2: The interfaces stanza includes a list of all of the SR-IOV devices discovered by the Operator on the worker node.

24.1.1.4. Example use of a virtual function in a pod

You can run a remote direct memory access (RDMA) or a Data Plane Development Kit (DPDK) application in a pod with SR-IOV VF attached.

This example shows a pod using a virtual function (VF) in RDMA mode:

Pod spec that uses RDMA mode

apiVersion: v1
kind: Pod
metadata:
  name: rdma-app
  annotations:
    k8s.v1.cni.cncf.io/networks: sriov-rdma-mlnx
spec:
  containers:
  - name: testpmd
    image: <RDMA_image>
    imagePullPolicy: IfNotPresent
    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"]
    command: ["sleep", "infinity"]

apiVersion: v1
kind: Pod
metadata:
  name: rdma-app
  annotations:
    k8s.v1.cni.cncf.io/networks: sriov-rdma-mlnx
spec:
  containers:
  - name: testpmd
    image: <RDMA_image>
    imagePullPolicy: IfNotPresent
    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"]
    command: ["sleep", "infinity"]

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The following example shows a pod with a VF in DPDK mode:

Pod spec that uses DPDK mode

apiVersion: v1
kind: Pod
metadata:
  name: dpdk-app
  annotations:
    k8s.v1.cni.cncf.io/networks: sriov-dpdk-net
spec:
  containers:
  - name: testpmd
    image: <DPDK_image>
    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"]
    volumeMounts:
    - mountPath: /dev/hugepages
      name: hugepage
    resources:
      limits:
        memory: "1Gi"
        cpu: "2"
        hugepages-1Gi: "4Gi"
      requests:
        memory: "1Gi"
        cpu: "2"
        hugepages-1Gi: "4Gi"
    command: ["sleep", "infinity"]
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

apiVersion: v1
kind: Pod
metadata:
  name: dpdk-app
  annotations:
    k8s.v1.cni.cncf.io/networks: sriov-dpdk-net
spec:
  containers:
  - name: testpmd
    image: <DPDK_image>
    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"]
    volumeMounts:
    - mountPath: /dev/hugepages
      name: hugepage
    resources:
      limits:
        memory: "1Gi"
        cpu: "2"
        hugepages-1Gi: "4Gi"
      requests:
        memory: "1Gi"
        cpu: "2"
        hugepages-1Gi: "4Gi"
    command: ["sleep", "infinity"]
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

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24.1.1.5. DPDK library for use with container applications

An optional library, app-netutil, provides several API methods for gathering network information about a pod from within a container running within that pod.

This library can assist with integrating SR-IOV virtual functions (VFs) in Data Plane Development Kit (DPDK) mode into the container. The library provides both a Golang API and a C API.

Currently there are three API methods implemented:

GetCPUInfo(): This function determines which CPUs are available to the container and returns the list.
GetHugepages(): This function determines the amount of huge page memory requested in the Pod spec for each container and returns the values.
GetInterfaces(): This function determines the set of interfaces in the container and returns the list. The return value includes the interface type and type-specific data for each interface.

The repository for the library includes a sample Dockerfile to build a container image, dpdk-app-centos. The container image can run one of the following DPDK sample applications, depending on an environment variable in the pod specification: l2fwd, l3wd or testpmd. The container image provides an example of integrating the app-netutil library into the container image itself. The library can also integrate into an init container. The init container can collect the required data and pass the data to an existing DPDK workload.

24.1.1.6. Huge pages resource injection for Downward API

When a pod specification includes a resource request or limit for huge pages, the Network Resources Injector automatically adds Downward API fields to the pod specification to provide the huge pages information to the container.

The Network Resources Injector adds a volume that is named podnetinfo and is mounted at /etc/podnetinfo for each container in the pod. The volume uses the Downward API and includes a file for huge pages requests and limits. The file naming convention is as follows:

/etc/podnetinfo/hugepages_1G_request_<container-name>
/etc/podnetinfo/hugepages_1G_limit_<container-name>
/etc/podnetinfo/hugepages_2M_request_<container-name>
/etc/podnetinfo/hugepages_2M_limit_<container-name>

The paths specified in the previous list are compatible with the app-netutil library. By default, the library is configured to search for resource information in the /etc/podnetinfo directory. If you choose to specify the Downward API path items yourself manually, the app-netutil library searches for the following paths in addition to the paths in the previous list.

/etc/podnetinfo/hugepages_request
/etc/podnetinfo/hugepages_limit
/etc/podnetinfo/hugepages_1G_request
/etc/podnetinfo/hugepages_1G_limit
/etc/podnetinfo/hugepages_2M_request
/etc/podnetinfo/hugepages_2M_limit

As with the paths that the Network Resources Injector can create, the paths in the preceding list can optionally end with a _<container-name> suffix.

24.1.3. Next steps

Installing the SR-IOV Network Operator
Optional: Configuring the SR-IOV Network Operator
Configuring an SR-IOV network device
If you use OpenShift Virtualization: Connecting a virtual machine to an SR-IOV network
Configuring an SR-IOV network attachment
Adding a pod to an SR-IOV additional network

24.2. Installing the SR-IOV Network Operator

You can install the Single Root I/O Virtualization (SR-IOV) Network Operator on your cluster to manage SR-IOV network devices and network attachments.

24.2.1. Installing SR-IOV Network Operator

As a cluster administrator, you can install the SR-IOV Network Operator by using the OpenShift Container Platform CLI or the web console.

24.2.1.1. CLI: Installing the SR-IOV Network Operator

As a cluster administrator, you can install the Operator using the CLI.

Prerequisites

A cluster installed on bare-metal hardware with nodes that have hardware that supports SR-IOV.
Install the OpenShift CLI (oc).
An account with cluster-admin privileges.

Procedure

To create the openshift-sriov-network-operator namespace, enter the following command:

cat << EOF| oc create -f -
apiVersion: v1
kind: Namespace
metadata:
  name: openshift-sriov-network-operator
  annotations:
    workload.openshift.io/allowed: management
EOF

$ cat << EOF| oc create -f -
apiVersion: v1
kind: Namespace
metadata:
  name: openshift-sriov-network-operator
  annotations:
    workload.openshift.io/allowed: management
EOF

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To create an OperatorGroup CR, enter the following command:

cat << EOF| oc create -f -
apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: sriov-network-operators
  namespace: openshift-sriov-network-operator
spec:
  targetNamespaces:
  - openshift-sriov-network-operator
EOF

$ cat << EOF| oc create -f -
apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: sriov-network-operators
  namespace: openshift-sriov-network-operator
spec:
  targetNamespaces:
  - openshift-sriov-network-operator
EOF

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Subscribe to the SR-IOV Network Operator.

Run the following command to get the OpenShift Container Platform major and minor version. It is required for the channel value in the next step.

OC_VERSION=$(oc version -o yaml | grep openshiftVersion | \
    grep -o '[0-9]*[.][0-9]*' | head -1)

$ OC_VERSION=$(oc version -o yaml | grep openshiftVersion | \
    grep -o '[0-9]*[.][0-9]*' | head -1)

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To create a Subscription CR for the SR-IOV Network Operator, enter the following command:

cat << EOF| oc create -f -
apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: sriov-network-operator-subscription
  namespace: openshift-sriov-network-operator
spec:
  channel: "${OC_VERSION}"
  name: sriov-network-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace
EOF

$ cat << EOF| oc create -f -
apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: sriov-network-operator-subscription
  namespace: openshift-sriov-network-operator
spec:
  channel: "${OC_VERSION}"
  name: sriov-network-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace
EOF

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To verify that the Operator is installed, enter the following command:

oc get csv -n openshift-sriov-network-operator \
  -o custom-columns=Name:.metadata.name,Phase:.status.phase

$ oc get csv -n openshift-sriov-network-operator \
  -o custom-columns=Name:.metadata.name,Phase:.status.phase

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Example output

Name                                         Phase
sriov-network-operator.4.13.0-202310121402   Succeeded

Name                                         Phase
sriov-network-operator.4.13.0-202310121402   Succeeded

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24.2.1.2. Web console: Installing the SR-IOV Network Operator

As a cluster administrator, you can install the Operator using the web console.

Prerequisites

A cluster installed on bare-metal hardware with nodes that have hardware that supports SR-IOV.
Install the OpenShift CLI (oc).
An account with cluster-admin privileges.

Procedure

Install the SR-IOV Network Operator:
1. In the OpenShift Container Platform web console, click Operators → OperatorHub.
2. Select SR-IOV Network Operator from the list of available Operators, and then click Install.
3. On the Install Operator page, under Installed Namespace, select Operator recommended Namespace.
4. Click Install.
Verify that the SR-IOV Network Operator is installed successfully:
1. Navigate to the Operators → Installed Operators page.
2. Ensure that SR-IOV Network Operator is listed in the openshift-sriov-network-operator project with a Status of InstallSucceeded.
  Note
  During installation an Operator might display a Failed status. If the installation later succeeds with an InstallSucceeded message, you can ignore the Failed message.
  If the Operator does not appear as installed, to troubleshoot further:
  - Inspect the Operator Subscriptions and Install Plans tabs for any failure or errors under Status.
  - Navigate to the Workloads → Pods page and check the logs for pods in the openshift-sriov-network-operator project.
  - Check the namespace of the YAML file. If the annotation is missing, you can add the annotation workload.openshift.io/allowed=management to the Operator namespace with the following command:
    
    $ oc annotate ns/openshift-sriov-network-operator workload.openshift.io/allowed=management
    
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    Note
    For single-node OpenShift clusters, the annotation workload.openshift.io/allowed=management is required for the namespace.

24.2.2. Next steps

Optional: Configuring the SR-IOV Network Operator

24.3. Configuring the SR-IOV Network Operator

The Single Root I/O Virtualization (SR-IOV) Network Operator manages the SR-IOV network devices and network attachments in your cluster.

24.3.1. Configuring the SR-IOV Network Operator

Important

Modifying the SR-IOV Network Operator configuration is not normally necessary. The default configuration is recommended for most use cases. Complete the steps to modify the relevant configuration only if the default behavior of the Operator is not compatible with your use case.

The SR-IOV Network Operator adds the SriovOperatorConfig.sriovnetwork.openshift.io CustomResourceDefinition resource. The Operator automatically creates a SriovOperatorConfig custom resource (CR) named default in the openshift-sriov-network-operator namespace.

Note

The default CR contains the SR-IOV Network Operator configuration for your cluster. To change the Operator configuration, you must modify this CR.

24.3.1.1. SR-IOV Network Operator config custom resource

The fields for the sriovoperatorconfig custom resource are described in the following table:

Table 24.2. SR-IOV Network Operator config custom resource
Field	Type	Description
`metadata.name`	`string`	Specifies the name of the SR-IOV Network Operator instance. The default value is `default`. Do not set a different value.
`metadata.namespace`	`string`	Specifies the namespace of the SR-IOV Network Operator instance. The default value is `openshift-sriov-network-operator`. Do not set a different value.
`spec.configDaemonNodeSelector`	`string`	Specifies the node selection to control scheduling the SR-IOV Network Config Daemon on selected nodes. By default, this field is not set and the Operator deploys the SR-IOV Network Config daemon set on worker nodes.
`spec.disableDrain`	`boolean`	Specifies whether to disable the node draining process or enable the node draining process when you apply a new policy to configure the NIC on a node. Setting this field to `true` facilitates software development and installing OpenShift Container Platform on a single node. By default, this field is not set. For single-node clusters, set this field to `true` after installing the Operator. This field must remain set to `true`.
`spec.enableInjector`	`boolean`	Specifies whether to enable or disable the Network Resources Injector daemon set. By default, this field is set to `true`.
`spec.enableOperatorWebhook`	`boolean`	Specifies whether to enable or disable the Operator Admission Controller webhook daemon set.
`spec.logLevel`	`integer`	Specifies the log verbosity level of the Operator. By default, this field is set to `0`, which shows only basic logs. Set to `2` to show all the available logs.

24.3.1.2. About the Network Resources Injector

The Network Resources Injector is a Kubernetes Dynamic Admission Controller application. It provides the following capabilities:

Mutation of resource requests and limits in a pod specification to add an SR-IOV resource name according to an SR-IOV network attachment definition annotation.
Mutation of a pod specification with a Downward API volume to expose pod annotations, labels, and huge pages requests and limits. Containers that run in the pod can access the exposed information as files under the /etc/podnetinfo path.

By default, the Network Resources Injector is enabled by the SR-IOV Network Operator and runs as a daemon set on all control plane nodes. The following is an example of Network Resources Injector pods running in a cluster with three control plane nodes:

oc get pods -n openshift-sriov-network-operator

$ oc get pods -n openshift-sriov-network-operator

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Example output

NAME                                      READY   STATUS    RESTARTS   AGE
network-resources-injector-5cz5p          1/1     Running   0          10m
network-resources-injector-dwqpx          1/1     Running   0          10m
network-resources-injector-lktz5          1/1     Running   0          10m

NAME                                      READY   STATUS    RESTARTS   AGE
network-resources-injector-5cz5p          1/1     Running   0          10m
network-resources-injector-dwqpx          1/1     Running   0          10m
network-resources-injector-lktz5          1/1     Running   0          10m

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24.3.1.3. About the SR-IOV Network Operator admission controller webhook

The SR-IOV Network Operator Admission Controller webhook is a Kubernetes Dynamic Admission Controller application. It provides the following capabilities:

Validation of the SriovNetworkNodePolicy CR when it is created or updated.
Mutation of the SriovNetworkNodePolicy CR by setting the default value for the priority and deviceType fields when the CR is created or updated.

By default the SR-IOV Network Operator Admission Controller webhook is enabled by the Operator and runs as a daemon set on all control plane nodes.

Note

Use caution when disabling the SR-IOV Network Operator Admission Controller webhook. You can disable the webhook under specific circumstances, such as troubleshooting, or if you want to use unsupported devices. For information about configuring unsupported devices, see Configuring the SR-IOV Network Operator to use an unsupported NIC.

The following is an example of the Operator Admission Controller webhook pods running in a cluster with three control plane nodes:

oc get pods -n openshift-sriov-network-operator

$ oc get pods -n openshift-sriov-network-operator

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Example output

NAME                                      READY   STATUS    RESTARTS   AGE
operator-webhook-9jkw6                    1/1     Running   0          16m
operator-webhook-kbr5p                    1/1     Running   0          16m
operator-webhook-rpfrl                    1/1     Running   0          16m

NAME                                      READY   STATUS    RESTARTS   AGE
operator-webhook-9jkw6                    1/1     Running   0          16m
operator-webhook-kbr5p                    1/1     Running   0          16m
operator-webhook-rpfrl                    1/1     Running   0          16m

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24.3.1.4. About custom node selectors

The SR-IOV Network Config daemon discovers and configures the SR-IOV network devices on cluster nodes. By default, it is deployed to all the worker nodes in the cluster. You can use node labels to specify on which nodes the SR-IOV Network Config daemon runs.

24.3.1.5. Disabling or enabling the Network Resources Injector

To disable or enable the Network Resources Injector, which is enabled by default, complete the following procedure.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.
You must have installed the SR-IOV Network Operator.

Procedure

Set the enableInjector field. Replace <value> with false to disable the feature or true to enable the feature.

oc patch sriovoperatorconfig default \
  --type=merge -n openshift-sriov-network-operator \
  --patch '{ "spec": { "enableInjector": <value> } }'

$ oc patch sriovoperatorconfig default \
  --type=merge -n openshift-sriov-network-operator \
  --patch '{ "spec": { "enableInjector": <value> } }'

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Tip

You can alternatively apply the following YAML to update the Operator:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default
  namespace: openshift-sriov-network-operator
spec:
  enableInjector: <value>

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default
  namespace: openshift-sriov-network-operator
spec:
  enableInjector: <value>

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24.3.1.6. Disabling or enabling the SR-IOV Network Operator admission controller webhook

To disable or enable the admission controller webhook, which is enabled by default, complete the following procedure.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.
You must have installed the SR-IOV Network Operator.

Procedure

Set the enableOperatorWebhook field. Replace <value> with false to disable the feature or true to enable it:

oc patch sriovoperatorconfig default --type=merge \
  -n openshift-sriov-network-operator \
  --patch '{ "spec": { "enableOperatorWebhook": <value> } }'

$ oc patch sriovoperatorconfig default --type=merge \
  -n openshift-sriov-network-operator \
  --patch '{ "spec": { "enableOperatorWebhook": <value> } }'

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Tip

You can alternatively apply the following YAML to update the Operator:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default
  namespace: openshift-sriov-network-operator
spec:
  enableOperatorWebhook: <value>

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default
  namespace: openshift-sriov-network-operator
spec:
  enableOperatorWebhook: <value>

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24.3.1.7. Configuring a custom NodeSelector for the SR-IOV Network Config daemon

The SR-IOV Network Config daemon discovers and configures the SR-IOV network devices on cluster nodes. By default, it is deployed to all the worker nodes in the cluster. You can use node labels to specify on which nodes the SR-IOV Network Config daemon runs.

To specify the nodes where the SR-IOV Network Config daemon is deployed, complete the following procedure.

Important

When you update the configDaemonNodeSelector field, the SR-IOV Network Config daemon is recreated on each selected node. While the daemon is recreated, cluster users are unable to apply any new SR-IOV Network node policy or create new SR-IOV pods.

Procedure

To update the node selector for the operator, enter the following command:

oc patch sriovoperatorconfig default --type=json \
  -n openshift-sriov-network-operator \
  --patch '[{

$ oc patch sriovoperatorconfig default --type=json \
  -n openshift-sriov-network-operator \
  --patch '[{
      "op": "replace",
      "path": "/spec/configDaemonNodeSelector",
      "value": {<node_label>}
    }]'

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Replace <node_label> with a label to apply as in the following example: "node-role.kubernetes.io/worker": "".

Tip

You can alternatively apply the following YAML to update the Operator:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default
  namespace: openshift-sriov-network-operator
spec:
  configDaemonNodeSelector:
    <node_label>

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default
  namespace: openshift-sriov-network-operator
spec:
  configDaemonNodeSelector:
    <node_label>

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24.3.1.8. Configuring the SR-IOV Network Operator for single node installations

By default, the SR-IOV Network Operator drains workloads from a node before every policy change. The Operator performs this action to ensure that there no workloads using the virtual functions before the reconfiguration.

For installations on a single node, there are no other nodes to receive the workloads. As a result, the Operator must be configured not to drain the workloads from the single node.

Important

After performing the following procedure to disable draining workloads, you must remove any workload that uses an SR-IOV network interface before you change any SR-IOV network node policy.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.
You must have installed the SR-IOV Network Operator.

Procedure

To set the disableDrain field to true, enter the following command:

oc patch sriovoperatorconfig default --type=merge \
  -n openshift-sriov-network-operator \
  --patch '{ "spec": { "disableDrain": true } }'

$ oc patch sriovoperatorconfig default --type=merge \
  -n openshift-sriov-network-operator \
  --patch '{ "spec": { "disableDrain": true } }'

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Tip

You can alternatively apply the following YAML to update the Operator:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default
  namespace: openshift-sriov-network-operator
spec:
  disableDrain: true

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default
  namespace: openshift-sriov-network-operator
spec:
  disableDrain: true

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24.3.1.9. Deploying the SR-IOV Operator for hosted control planes

Important

Hosted control planes is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

After you configure and deploy your hosting service cluster, you can create a subscription to the SR-IOV Operator on a hosted cluster. The SR-IOV pod runs on worker machines rather than the control plane.

Prerequisites

You must configure and deploy the hosted cluster on AWS. For more information, see Configuring the hosting cluster on AWS (Technology Preview).

Procedure

Create a namespace and an Operator group:

apiVersion: v1
kind: Namespace
metadata:
  name: openshift-sriov-network-operator
---
apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: sriov-network-operators
  namespace: openshift-sriov-network-operator
spec:
  targetNamespaces:
  - openshift-sriov-network-operator

apiVersion: v1
kind: Namespace
metadata:
  name: openshift-sriov-network-operator
---
apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: sriov-network-operators
  namespace: openshift-sriov-network-operator
spec:
  targetNamespaces:
  - openshift-sriov-network-operator

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Create a subscription to the SR-IOV Operator:

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: sriov-network-operator-subsription
  namespace: openshift-sriov-network-operator
spec:
  channel: "4.13"
  name: sriov-network-operator
  config:
    nodeSelector:
      node-role.kubernetes.io/worker: ""
  source: s/qe-app-registry/redhat-operators
  sourceNamespace: openshift-marketplace

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: sriov-network-operator-subsription
  namespace: openshift-sriov-network-operator
spec:
  channel: "4.13"
  name: sriov-network-operator
  config:
    nodeSelector:
      node-role.kubernetes.io/worker: ""
  source: s/qe-app-registry/redhat-operators
  sourceNamespace: openshift-marketplace

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Verification

To verify that the SR-IOV Operator is ready, run the following command and view the resulting output:

oc get csv -n openshift-sriov-network-operator

$ oc get csv -n openshift-sriov-network-operator

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Example output

NAME                                         DISPLAY                   VERSION               REPLACES                                     PHASE
sriov-network-operator.4.13.0-202211021237   SR-IOV Network Operator   4.13.0-202211021237   sriov-network-operator.4.13.0-202210290517   Succeeded

NAME                                         DISPLAY                   VERSION               REPLACES                                     PHASE
sriov-network-operator.4.13.0-202211021237   SR-IOV Network Operator   4.13.0-202211021237   sriov-network-operator.4.13.0-202210290517   Succeeded

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To verify that the SR-IOV pods are deployed, run the following command:

oc get pods -n openshift-sriov-network-operator

$ oc get pods -n openshift-sriov-network-operator

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24.3.2. Next steps

Configuring an SR-IOV network device

24.4. Configuring an SR-IOV network device

You can configure a Single Root I/O Virtualization (SR-IOV) device in your cluster.

24.4.1. SR-IOV network node configuration object

You specify the SR-IOV network device configuration for a node by creating an SR-IOV network node policy. The API object for the policy is part of the sriovnetwork.openshift.io API group.

The following YAML describes an SR-IOV network node policy:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: <name> 
  namespace: openshift-sriov-network-operator 
spec:
  resourceName: <sriov_resource_name> 
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true" 
  priority: <priority> 
  mtu: <mtu> 
  needVhostNet: false 
  numVfs: <num> 
  nicSelector: 
    vendor: "<vendor_code>" 
    deviceID: "<device_id>" 
    pfNames: ["<pf_name>", ...] 
    rootDevices: ["<pci_bus_id>", ...] 
    netFilter: "<filter_string>" 
  deviceType: <device_type> 
  isRdma: false 
  linkType: <link_type> 
  eSwitchMode: <mode> 
  excludeTopology: false

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: <name>

1


  namespace: openshift-sriov-network-operator

2


spec:
  resourceName: <sriov_resource_name>

3


  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"

4


  priority: <priority>

5


  mtu: <mtu>

6


  needVhostNet: false

7


  numVfs: <num>

8


  nicSelector:

9


    vendor: "<vendor_code>"

10


    deviceID: "<device_id>"

11


    pfNames: ["<pf_name>", ...]

12


    rootDevices: ["<pci_bus_id>", ...]

13


    netFilter: "<filter_string>"

14


  deviceType: <device_type>

15


  isRdma: false

16


  linkType: <link_type>

17


  eSwitchMode: <mode>

18


  excludeTopology: false

19

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The name for the custom resource object.

The namespace where the SR-IOV Network Operator is installed.

The resource name of the SR-IOV network device plugin. You can create multiple SR-IOV network node policies for a resource name.

When specifying a name, be sure to use the accepted syntax expression ^[a-zA-Z0-9_]+$ in the resourceName.

4

The node selector specifies the nodes to configure. Only SR-IOV network devices on the selected nodes are configured. The SR-IOV Container Network Interface (CNI) plugin and device plugin are deployed on selected nodes only.

Important

The SR-IOV Network Operator applies node network configuration policies to nodes in sequence. Before applying node network configuration policies, the SR-IOV Network Operator checks if the machine config pool (MCP) for a node is in an unhealthy state such as Degraded or Updating. If a node is in an unhealthy MCP, the process of applying node network configuration policies to all targeted nodes in the cluster pauses until the MCP returns to a healthy state.

To avoid a node in an unhealthy MCP from blocking the application of node network configuration policies to other nodes, including nodes in other MCPs, you must create a separate node network configuration policy for each MCP.

5

Optional: The priority is an integer value between 0 and 99. A smaller value receives higher priority. For example, a priority of 10 is a higher priority than 99. The default value is 99.

6

Optional: The maximum transmission unit (MTU) of the virtual function. The maximum MTU value can vary for different network interface controller (NIC) models.

Important

If you want to create virtual function on the default network interface, ensure that the MTU is set to a value that matches the cluster MTU.

7

Optional: Set needVhostNet to true to mount the /dev/vhost-net device in the pod. Use the mounted /dev/vhost-net device with Data Plane Development Kit (DPDK) to forward traffic to the kernel network stack.

8

The number of the virtual functions (VF) to create for the SR-IOV physical network device. For an Intel network interface controller (NIC), the number of VFs cannot be larger than the total VFs supported by the device. For a Mellanox NIC, the number of VFs cannot be larger than 127.

9

The NIC selector identifies the device for the Operator to configure. You do not have to specify values for all the parameters. It is recommended to identify the network device with enough precision to avoid selecting a device unintentionally.

If you specify rootDevices, you must also specify a value for vendor, deviceID, or pfNames. If you specify both pfNames and rootDevices at the same time, ensure that they refer to the same device. If you specify a value for netFilter, then you do not need to specify any other parameter because a network ID is unique.

10

Optional: The vendor hexadecimal code of the SR-IOV network device. The only allowed values are 8086 and 15b3.

11

Optional: The device hexadecimal code of the SR-IOV network device. For example, 101b is the device ID for a Mellanox ConnectX-6 device.

12

Optional: An array of one or more physical function (PF) names for the device.

13

Optional: An array of one or more PCI bus addresses for the PF of the device. Provide the address in the following format: 0000:02:00.1.

14

Optional: The platform-specific network filter. The only supported platform is Red Hat OpenStack Platform (RHOSP). Acceptable values use the following format: openstack/NetworkID:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. Replace xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx with the value from the /var/config/openstack/latest/network_data.json metadata file.

15

Optional: The driver type for the virtual functions. The only allowed values are netdevice and vfio-pci. The default value is netdevice.

For a Mellanox NIC to work in DPDK mode on bare metal nodes, use the netdevice driver type and set isRdma to true.

16

Optional: Configures whether to enable remote direct memory access (RDMA) mode. The default value is false.

If the isRdma parameter is set to true, you can continue to use the RDMA-enabled VF as a normal network device. A device can be used in either mode.

Set isRdma to true and additionally set needVhostNet to true to configure a Mellanox NIC for use with Fast Datapath DPDK applications.

Note

You cannot set the isRdma parameter to true for intel NICs.

17

Optional: The link type for the VFs. The default value is eth for Ethernet. Change this value to 'ib' for InfiniBand.

When linkType is set to ib, isRdma is automatically set to true by the SR-IOV Network Operator webhook. When linkType is set to ib, deviceType should not be set to vfio-pci.

Do not set linkType to 'eth' for SriovNetworkNodePolicy, because this can lead to an incorrect number of available devices reported by the device plugin.

18

Optional: The NIC device mode. The only allowed values are legacy or switchdev.

When eSwitchMode is set to legacy, the default SR-IOV behavior is enabled.

When eSwitchMode is set to switchdev, hardware offloading is enabled.

19

Optional: To exclude advertising an SR-IOV network resource’s NUMA node to the Topology Manager, set the value to true. The default value is false.

24.4.1.1. SR-IOV network node configuration examples

The following example describes the configuration for an InfiniBand device:

Example configuration for an InfiniBand device

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-ib-net-1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: ibnic1
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 4
  nicSelector:
    vendor: "15b3"
    deviceID: "101b"
    rootDevices:
      - "0000:19:00.0"
  linkType: ib
  isRdma: true

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-ib-net-1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: ibnic1
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 4
  nicSelector:
    vendor: "15b3"
    deviceID: "101b"
    rootDevices:
      - "0000:19:00.0"
  linkType: ib
  isRdma: true

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The following example describes the configuration for an SR-IOV network device in a RHOSP virtual machine:

Example configuration for an SR-IOV device in a virtual machine

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-sriov-net-openstack-1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: sriovnic1
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 1 
  nicSelector:
    vendor: "15b3"
    deviceID: "101b"
    netFilter: "openstack/NetworkID:ea24bd04-8674-4f69-b0ee-fa0b3bd20509"

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-sriov-net-openstack-1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: sriovnic1
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 1

1


  nicSelector:
    vendor: "15b3"
    deviceID: "101b"
    netFilter: "openstack/NetworkID:ea24bd04-8674-4f69-b0ee-fa0b3bd20509"

2

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1: The numVfs field is always set to 1 when configuring the node network policy for a virtual machine.
2: The netFilter field must refer to a network ID when the virtual machine is deployed on RHOSP. Valid values for netFilter are available from an SriovNetworkNodeState object.

24.4.1.2. Virtual function (VF) partitioning for SR-IOV devices

In some cases, you might want to split virtual functions (VFs) from the same physical function (PF) into multiple resource pools. For example, you might want some of the VFs to load with the default driver and the remaining VFs load with the vfio-pci driver. In such a deployment, the pfNames selector in your SriovNetworkNodePolicy custom resource (CR) can be used to specify a range of VFs for a pool using the following format: <pfname>#<first_vf>-<last_vf>.

For example, the following YAML shows the selector for an interface named netpf0 with VF 2 through 7:

pfNames: ["netpf0#2-7"]

pfNames: ["netpf0#2-7"]

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netpf0 is the PF interface name.
2 is the first VF index (0-based) that is included in the range.
7 is the last VF index (0-based) that is included in the range.

You can select VFs from the same PF by using different policy CRs if the following requirements are met:

The numVfs value must be identical for policies that select the same PF.
The VF index must be in the range of 0 to <numVfs>-1. For example, if you have a policy with numVfs set to 8, then the <first_vf> value must not be smaller than 0, and the <last_vf> must not be larger than 7.
The VFs ranges in different policies must not overlap.
The <first_vf> must not be larger than the <last_vf>.

The following example illustrates NIC partitioning for an SR-IOV device.

The policy policy-net-1 defines a resource pool net-1 that contains the VF 0 of PF netpf0 with the default VF driver. The policy policy-net-1-dpdk defines a resource pool net-1-dpdk that contains the VF 8 to 15 of PF netpf0 with the vfio VF driver.

Policy policy-net-1:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-net-1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: net1
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 16
  nicSelector:
    pfNames: ["netpf0#0-0"]
  deviceType: netdevice

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-net-1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: net1
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 16
  nicSelector:
    pfNames: ["netpf0#0-0"]
  deviceType: netdevice

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Policy policy-net-1-dpdk:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-net-1-dpdk
  namespace: openshift-sriov-network-operator
spec:
  resourceName: net1dpdk
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 16
  nicSelector:
    pfNames: ["netpf0#8-15"]
  deviceType: vfio-pci

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-net-1-dpdk
  namespace: openshift-sriov-network-operator
spec:
  resourceName: net1dpdk
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 16
  nicSelector:
    pfNames: ["netpf0#8-15"]
  deviceType: vfio-pci

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Verifying that the interface is successfully partitioned

Confirm that the interface partitioned to virtual functions (VFs) for the SR-IOV device by running the following command.

ip link show <interface>

$ ip link show <interface>

1

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1: Replace <interface> with the interface that you specified when partitioning to VFs for the SR-IOV device, for example, ens3f1.

Example output

5: ens3f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether 3c:fd:fe:d1:bc:01 brd ff:ff:ff:ff:ff:ff

vf 0     link/ether 5a:e7:88:25:ea:a0 brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off
vf 1     link/ether 3e:1d:36:d7:3d:49 brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off
vf 2     link/ether ce:09:56:97:df:f9 brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off
vf 3     link/ether 5e:91:cf:88:d1:38 brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off
vf 4     link/ether e6:06:a1:96:2f:de brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off

5: ens3f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
link/ether 3c:fd:fe:d1:bc:01 brd ff:ff:ff:ff:ff:ff

vf 0     link/ether 5a:e7:88:25:ea:a0 brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off
vf 1     link/ether 3e:1d:36:d7:3d:49 brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off
vf 2     link/ether ce:09:56:97:df:f9 brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off
vf 3     link/ether 5e:91:cf:88:d1:38 brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off
vf 4     link/ether e6:06:a1:96:2f:de brd ff:ff:ff:ff:ff:ff, spoof checking on, link-state auto, trust off

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24.4.2. Configuring SR-IOV network devices

The SR-IOV Network Operator adds the SriovNetworkNodePolicy.sriovnetwork.openshift.io CustomResourceDefinition to OpenShift Container Platform. You can configure an SR-IOV network device by creating a SriovNetworkNodePolicy custom resource (CR).

Note

When applying the configuration specified in a SriovNetworkNodePolicy object, the SR-IOV Operator might drain the nodes, and in some cases, reboot nodes.

It might take several minutes for a configuration change to apply.

Prerequisites

You installed the OpenShift CLI (oc).
You have access to the cluster as a user with the cluster-admin role.
You have installed the SR-IOV Network Operator.
You have enough available nodes in your cluster to handle the evicted workload from drained nodes.
You have not selected any control plane nodes for SR-IOV network device configuration.

Procedure

Create an SriovNetworkNodePolicy object, and then save the YAML in the <name>-sriov-node-network.yaml file. Replace <name> with the name for this configuration.
Optional: Label the SR-IOV capable cluster nodes with SriovNetworkNodePolicy.Spec.NodeSelector if they are not already labeled. For more information about labeling nodes, see "Understanding how to update labels on nodes".
Create the SriovNetworkNodePolicy object:
```
oc create -f <name>-sriov-node-network.yaml
```
```
$ oc create -f <name>-sriov-node-network.yaml
```
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where <name> specifies the name for this configuration.
After applying the configuration update, all the pods in sriov-network-operator namespace transition to the Running status.

To verify that the SR-IOV network device is configured, enter the following command. Replace <node_name> with the name of a node with the SR-IOV network device that you just configured.

oc get sriovnetworknodestates -n openshift-sriov-network-operator <node_name> -o jsonpath='{.status.syncStatus}'

$ oc get sriovnetworknodestates -n openshift-sriov-network-operator <node_name> -o jsonpath='{.status.syncStatus}'

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24.4.3. Troubleshooting SR-IOV configuration

After following the procedure to configure an SR-IOV network device, the following sections address some error conditions.

To display the state of nodes, run the following command:

oc get sriovnetworknodestates -n openshift-sriov-network-operator <node_name>

$ oc get sriovnetworknodestates -n openshift-sriov-network-operator <node_name>

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where: <node_name> specifies the name of a node with an SR-IOV network device.

Error output: Cannot allocate memory

"lastSyncError": "write /sys/bus/pci/devices/0000:3b:00.1/sriov_numvfs: cannot allocate memory"

"lastSyncError": "write /sys/bus/pci/devices/0000:3b:00.1/sriov_numvfs: cannot allocate memory"

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When a node indicates that it cannot allocate memory, check the following items:

Confirm that global SR-IOV settings are enabled in the BIOS for the node.
Confirm that VT-d is enabled in the BIOS for the node.

24.4.4. Assigning an SR-IOV network to a VRF

As a cluster administrator, you can assign an SR-IOV network interface to your VRF domain by using the CNI VRF plugin.

To do this, add the VRF configuration to the optional metaPlugins parameter of the SriovNetwork resource.

Note

Applications that use VRFs need to bind to a specific device. The common usage is to use the SO_BINDTODEVICE option for a socket. SO_BINDTODEVICE binds the socket to a device that is specified in the passed interface name, for example, eth1. To use SO_BINDTODEVICE, the application must have CAP_NET_RAW capabilities.

Using a VRF through the ip vrf exec command is not supported in OpenShift Container Platform pods. To use VRF, bind applications directly to the VRF interface.

24.4.4.1. Creating an additional SR-IOV network attachment with the CNI VRF plugin

The SR-IOV Network Operator manages additional network definitions. When you specify an additional SR-IOV network to create, the SR-IOV Network Operator creates the NetworkAttachmentDefinition custom resource (CR) automatically.

Note

Do not edit NetworkAttachmentDefinition custom resources that the SR-IOV Network Operator manages. Doing so might disrupt network traffic on your additional network.

To create an additional SR-IOV network attachment with the CNI VRF plugin, perform the following procedure.

Prerequisites

Install the OpenShift Container Platform CLI (oc).
Log in to the OpenShift Container Platform cluster as a user with cluster-admin privileges.

Procedure

Create the SriovNetwork custom resource (CR) for the additional SR-IOV network attachment and insert the metaPlugins configuration, as in the following example CR. Save the YAML as the file sriov-network-attachment.yaml.

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: example-network
  namespace: additional-sriov-network-1
spec:
  ipam: |
    {
      "type": "host-local",
      "subnet": "10.56.217.0/24",
      "rangeStart": "10.56.217.171",
      "rangeEnd": "10.56.217.181",
      "routes": [{
        "dst": "0.0.0.0/0"
      }],
      "gateway": "10.56.217.1"
    }
  vlan: 0
  resourceName: intelnics
  metaPlugins : |
    {
      "type": "vrf", 
      "vrfname": "example-vrf-name" 
    }

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: example-network
  namespace: additional-sriov-network-1
spec:
  ipam: |
    {
      "type": "host-local",
      "subnet": "10.56.217.0/24",
      "rangeStart": "10.56.217.171",
      "rangeEnd": "10.56.217.181",
      "routes": [{
        "dst": "0.0.0.0/0"
      }],
      "gateway": "10.56.217.1"
    }
  vlan: 0
  resourceName: intelnics
  metaPlugins : |
    {
      "type": "vrf",

1


      "vrfname": "example-vrf-name"

2

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1: type must be set to vrf.
2: vrfname is the name of the VRF that the interface is assigned to. If it does not exist in the pod, it is created.

Create the SriovNetwork resource:

oc create -f sriov-network-attachment.yaml

$ oc create -f sriov-network-attachment.yaml

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Verifying that the NetworkAttachmentDefinition CR is successfully created

Confirm that the SR-IOV Network Operator created the NetworkAttachmentDefinition CR by running the following command.
```
oc get network-attachment-definitions -n <namespace>
```
```
$ oc get network-attachment-definitions -n <namespace> 
```
1
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1
Replace <namespace> with the namespace that you specified when configuring the network attachment, for example, additional-sriov-network-1.
Example output
```
NAME                            AGE
additional-sriov-network-1      14m
```
```
NAME                            AGE
additional-sriov-network-1      14m
```
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Note
There might be a delay before the SR-IOV Network Operator creates the CR.

Verifying that the additional SR-IOV network attachment is successful

To verify that the VRF CNI is correctly configured and the additional SR-IOV network attachment is attached, do the following:

Create an SR-IOV network that uses the VRF CNI.
Assign the network to a pod.
Verify that the pod network attachment is connected to the SR-IOV additional network. Remote shell into the pod and run the following command:
```
ip vrf show
```
```
$ ip vrf show
```
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Example output
```
Name              Table
-----------------------
red                 10
```
```
Name              Table
-----------------------
red                 10
```
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Confirm the VRF interface is master of the secondary interface:

ip link

$ ip link

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Example output

...
5: net1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master red state UP mode
...

...
5: net1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master red state UP mode
...

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24.4.5. Exclude the SR-IOV network topology for NUMA-aware scheduling

You can exclude advertising the Non-Uniform Memory Access (NUMA) node for the SR-IOV network to the Topology Manager for more flexible SR-IOV network deployments during NUMA-aware pod scheduling.

In some scenarios, it is a priority to maximize CPU and memory resources for a pod on a single NUMA node. By not providing a hint to the Topology Manager about the NUMA node for the pod’s SR-IOV network resource, the Topology Manager can deploy the SR-IOV network resource and the pod CPU and memory resources to different NUMA nodes. This can add to network latency because of the data transfer between NUMA nodes. However, it is acceptable in scenarios when workloads require optimal CPU and memory performance.

For example, consider a compute node, compute-1, that features two NUMA nodes: numa0 and numa1. The SR-IOV-enabled NIC is present on numa0. The CPUs available for pod scheduling are present on numa1 only. By setting the excludeTopology specification to true, the Topology Manager can assign CPU and memory resources for the pod to numa1 and can assign the SR-IOV network resource for the same pod to numa0. This is only possible when you set the excludeTopology specification to true. Otherwise, the Topology Manager attempts to place all resources on the same NUMA node.

24.4.5.1. Excluding the SR-IOV network topology for NUMA-aware scheduling

To exclude advertising the SR-IOV network resource’s Non-Uniform Memory Access (NUMA) node to the Topology Manager, you can configure the excludeTopology specification in the SriovNetworkNodePolicy custom resource. Use this configuration for more flexible SR-IOV network deployments during NUMA-aware pod scheduling.

Prerequisites

You have installed the OpenShift CLI (oc).
You have configured the CPU Manager policy to static. For more information about CPU Manager, see the Additional resources section.
You have configured the Topology Manager policy to single-numa-node.
You have installed the SR-IOV Network Operator.

Procedure

Create the SriovNetworkNodePolicy CR:

Save the following YAML in the sriov-network-node-policy.yaml file, replacing values in the YAML to match your environment:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: <policy_name>
  namespace: openshift-sriov-network-operator
spec:
  resourceName: sriovnuma0 
  nodeSelector:
    kubernetes.io/hostname: <node_name>
  numVfs: <number_of_Vfs>
  nicSelector: 
    vendor: "<vendor_ID>"
    deviceID: "<device_ID>"
  deviceType: netdevice
  excludeTopology: true

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: <policy_name>
  namespace: openshift-sriov-network-operator
spec:
  resourceName: sriovnuma0

1


  nodeSelector:
    kubernetes.io/hostname: <node_name>
  numVfs: <number_of_Vfs>
  nicSelector:

2


    vendor: "<vendor_ID>"
    deviceID: "<device_ID>"
  deviceType: netdevice
  excludeTopology: true

3

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1: The resource name of the SR-IOV network device plugin. This YAML uses a sample resourceName value.
2: Identify the device for the Operator to configure by using the NIC selector.
3: To exclude advertising the NUMA node for the SR-IOV network resource to the Topology Manager, set the value to true. The default value is false.

Note

If multiple SriovNetworkNodePolicy resources target the same SR-IOV network resource, the SriovNetworkNodePolicy resources must have the same value as the excludeTopology specification. Otherwise, the conflicting policy is rejected.

Create the SriovNetworkNodePolicy resource by running the following command:

oc create -f sriov-network-node-policy.yaml

$ oc create -f sriov-network-node-policy.yaml

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Example output

sriovnetworknodepolicy.sriovnetwork.openshift.io/policy-for-numa-0 created

sriovnetworknodepolicy.sriovnetwork.openshift.io/policy-for-numa-0 created

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Create the SriovNetwork CR:

Save the following YAML in the sriov-network.yaml file, replacing values in the YAML to match your environment:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: sriov-numa-0-network 
  namespace: openshift-sriov-network-operator
spec:
  resourceName: sriovnuma0 
  networkNamespace: <namespace> 
  ipam: |- 
    {
      "type": "<ipam_type>",
    }

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: sriov-numa-0-network

1


  namespace: openshift-sriov-network-operator
spec:
  resourceName: sriovnuma0

2


  networkNamespace: <namespace>

3


  ipam: |-

4


    {
      "type": "<ipam_type>",
    }

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1: Replace sriov-numa-0-network with the name for the SR-IOV network resource.
2: Specify the resource name for the SriovNetworkNodePolicy CR from the previous step. This YAML uses a sample resourceName value.
3: Enter the namespace for your SR-IOV network resource.
4: Enter the IP address management configuration for the SR-IOV network.

Create the SriovNetwork resource by running the following command:

oc create -f sriov-network.yaml

$ oc create -f sriov-network.yaml

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Example output

sriovnetwork.sriovnetwork.openshift.io/sriov-numa-0-network created

sriovnetwork.sriovnetwork.openshift.io/sriov-numa-0-network created

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Create a pod and assign the SR-IOV network resource from the previous step:

Save the following YAML in the sriov-network-pod.yaml file, replacing values in the YAML to match your environment:

apiVersion: v1
kind: Pod
metadata:
  name: <pod_name>
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {
          "name": "sriov-numa-0-network", 
        }
      ]
spec:
  containers:
  - name: <container_name>
    image: <image>
    imagePullPolicy: IfNotPresent
    command: ["sleep", "infinity"]

apiVersion: v1
kind: Pod
metadata:
  name: <pod_name>
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {
          "name": "sriov-numa-0-network",

1


        }
      ]
spec:
  containers:
  - name: <container_name>
    image: <image>
    imagePullPolicy: IfNotPresent
    command: ["sleep", "infinity"]

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1: This is the name of the SriovNetwork resource that uses the SriovNetworkNodePolicy resource.

Create the Pod resource by running the following command:

oc create -f sriov-network-pod.yaml

$ oc create -f sriov-network-pod.yaml

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Example output

pod/example-pod created

pod/example-pod created

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Verification

Verify the status of the pod by running the following command, replacing <pod_name> with the name of the pod:

oc get pod <pod_name>

$ oc get pod <pod_name>

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Example output

NAME                                     READY   STATUS    RESTARTS   AGE
test-deployment-sriov-76cbbf4756-k9v72   1/1     Running   0          45h

NAME                                     READY   STATUS    RESTARTS   AGE
test-deployment-sriov-76cbbf4756-k9v72   1/1     Running   0          45h

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Open a debug session with the target pod to verify that the SR-IOV network resources are deployed to a different node than the memory and CPU resources.
1. Open a debug session with the pod by running the following command, replacing <pod_name> with the target pod name.
  $ oc debug pod/<pod_name>
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2. Set /host as the root directory within the debug shell. The debug pod mounts the root file system from the host in /host within the pod. By changing the root directory to /host, you can run binaries from the host file system:
  $ chroot /host
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3. View information about the CPU allocation by running the following commands:
  $ lscpu | grep NUMA
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  Example output
  NUMA node(s): 2 NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,... NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,...
  
  Copy to Clipboard
  $ cat /proc/self/status | grep Cpus
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  Example output
  Cpus_allowed: aa Cpus_allowed_list: 1,3,5,7
  
  Copy to Clipboard
  $ cat /sys/class/net/net1/device/numa_node
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  Example output
  0
  
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  In this example, CPUs 1,3,5, and 7 are allocated to NUMA node1 but the SR-IOV network resource can use the NIC in NUMA node0.

Note

If the excludeTopology specification is set to True, it is possible that the required resources exist in the same NUMA node.

24.4.6. Next steps

Configuring an SR-IOV network attachment

24.5. Configuring an SR-IOV Ethernet network attachment

You can configure an Ethernet network attachment for an Single Root I/O Virtualization (SR-IOV) device in the cluster.

24.5.1. Ethernet device configuration object

You can configure an Ethernet network device by defining an SriovNetwork object.

The following YAML describes an SriovNetwork object:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: <name> 
  namespace: openshift-sriov-network-operator 
spec:
  resourceName: <sriov_resource_name> 
  networkNamespace: <target_namespace> 
  vlan: <vlan> 
  spoofChk: "<spoof_check>" 
  ipam: |- 
    {}
  linkState: <link_state> 
  maxTxRate: <max_tx_rate> 
  minTxRate: <min_tx_rate> 
  vlanQoS: <vlan_qos> 
  trust: "<trust_vf>" 
  capabilities: <capabilities>

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: <name>

1


  namespace: openshift-sriov-network-operator

2


spec:
  resourceName: <sriov_resource_name>

3


  networkNamespace: <target_namespace>

4


  vlan: <vlan>

5


  spoofChk: "<spoof_check>"

6


  ipam: |-

7


    {}
  linkState: <link_state>

8


  maxTxRate: <max_tx_rate>

9


  minTxRate: <min_tx_rate>

10


  vlanQoS: <vlan_qos>

11


  trust: "<trust_vf>"

12


  capabilities: <capabilities>

13

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1: A name for the object. The SR-IOV Network Operator creates a NetworkAttachmentDefinition object with same name.
2: The namespace where the SR-IOV Network Operator is installed.
3: The value for the spec.resourceName parameter from the SriovNetworkNodePolicy object that defines the SR-IOV hardware for this additional network.
4: The target namespace for the SriovNetwork object. Only pods in the target namespace can attach to the additional network.
5: Optional: A Virtual LAN (VLAN) ID for the additional network. The integer value must be from 0 to 4095. The default value is 0.
6: Optional: The spoof check mode of the VF. The allowed values are the strings "on" and "off".
Important
You must enclose the value you specify in quotes or the object is rejected by the SR-IOV Network Operator.
7: A configuration object for the IPAM CNI plugin as a YAML block scalar. The plugin manages IP address assignment for the attachment definition.
8: Optional: The link state of virtual function (VF). Allowed value are enable, disable and auto.
9: Optional: A maximum transmission rate, in Mbps, for the VF.
10: Optional: A minimum transmission rate, in Mbps, for the VF. This value must be less than or equal to the maximum transmission rate.
Note
Intel NICs do not support the minTxRate parameter. For more information, see BZ#1772847.
11: Optional: An IEEE 802.1p priority level for the VF. The default value is 0.
12: Optional: The trust mode of the VF. The allowed values are the strings "on" and "off".
Important
You must enclose the value that you specify in quotes, or the SR-IOV Network Operator rejects the object.
13: Optional: The capabilities to configure for this additional network. You can specify "{ "ips": true }" to enable IP address support or "{ "mac": true }" to enable MAC address support.

24.5.1.1. Configuration of IP address assignment for an additional network

The IP address management (IPAM) Container Network Interface (CNI) plugin provides IP addresses for other CNI plugins.

You can use the following IP address assignment types:

Static assignment.
Dynamic assignment through a DHCP server. The DHCP server you specify must be reachable from the additional network.
Dynamic assignment through the Whereabouts IPAM CNI plugin.

24.5.1.1.1. Static IP address assignment configuration

The following table describes the configuration for static IP address assignment:

Table 24.3. ipam static configuration object
Field	Type	Description
`type`	`string`	The IPAM address type. The value `static` is required.
`addresses`	`array`	An array of objects specifying IP addresses to assign to the virtual interface. Both IPv4 and IPv6 IP addresses are supported.
`routes`	`array`	An array of objects specifying routes to configure inside the pod.
`dns`	`array`	Optional: An array of objects specifying the DNS configuration.

The addresses array requires objects with the following fields:

Table 24.4. ipam.addresses[] array
Field	Type	Description
`address`	`string`	An IP address and network prefix that you specify. For example, if you specify `10.10.21.10/24`, then the additional network is assigned an IP address of `10.10.21.10` and the netmask is `255.255.255.0`.
`gateway`	`string`	The default gateway to route egress network traffic to.

Table 24.5. ipam.routes[] array
Field	Type	Description
`dst`	`string`	The IP address range in CIDR format, such as `192.168.17.0/24` or `0.0.0.0/0` for the default route.
`gw`	`string`	The gateway where network traffic is routed.

Table 24.6. ipam.dns object
Field	Type	Description
`nameservers`	`array`	An array of one or more IP addresses for to send DNS queries to.
`domain`	`array`	The default domain to append to a hostname. For example, if the domain is set to `example.com`, a DNS lookup query for `example-host` is rewritten as `example-host.example.com`.
`search`	`array`	An array of domain names to append to an unqualified hostname, such as `example-host`, during a DNS lookup query.

Static IP address assignment configuration example

{
  "ipam": {
    "type": "static",
      "addresses": [
        {
          "address": "191.168.1.7/24"
        }
      ]
  }
}

{
  "ipam": {
    "type": "static",
      "addresses": [
        {
          "address": "191.168.1.7/24"
        }
      ]
  }
}

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24.5.1.1.2. Dynamic IP address (DHCP) assignment configuration

The following JSON describes the configuration for dynamic IP address address assignment with DHCP.

Renewal of DHCP leases

A pod obtains its original DHCP lease when it is created. The lease must be periodically renewed by a minimal DHCP server deployment running on the cluster.

The SR-IOV Network Operator does not create a DHCP server deployment; The Cluster Network Operator is responsible for creating the minimal DHCP server deployment.

To trigger the deployment of the DHCP server, you must create a shim network attachment by editing the Cluster Network Operator configuration, as in the following example:

Example shim network attachment definition

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks:
  - name: dhcp-shim
    namespace: default
    type: Raw
    rawCNIConfig: |-
      {
        "name": "dhcp-shim",
        "cniVersion": "0.3.1",
        "type": "bridge",
        "ipam": {
          "type": "dhcp"
        }
      }
  # ...

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks:
  - name: dhcp-shim
    namespace: default
    type: Raw
    rawCNIConfig: |-
      {
        "name": "dhcp-shim",
        "cniVersion": "0.3.1",
        "type": "bridge",
        "ipam": {
          "type": "dhcp"
        }
      }
  # ...

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Table 24.7. ipam DHCP configuration object
Field	Type	Description
`type`	`string`	The IPAM address type. The value `dhcp` is required.

Dynamic IP address (DHCP) assignment configuration example

{
  "ipam": {
    "type": "dhcp"
  }
}

{
  "ipam": {
    "type": "dhcp"
  }
}

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24.5.1.1.3. Dynamic IP address assignment configuration with Whereabouts

The Whereabouts CNI plugin allows the dynamic assignment of an IP address to an additional network without the use of a DHCP server.

The following table describes the configuration for dynamic IP address assignment with Whereabouts:

Table 24.8. ipam whereabouts configuration object
Field	Type	Description
`type`	`string`	The IPAM address type. The value `whereabouts` is required.
`range`	`string`	An IP address and range in CIDR notation. IP addresses are assigned from within this range of addresses.
`exclude`	`array`	Optional: A list of zero or more IP addresses and ranges in CIDR notation. IP addresses within an excluded address range are not assigned.

Dynamic IP address assignment configuration example that uses Whereabouts

{
  "ipam": {
    "type": "whereabouts",
    "range": "192.0.2.192/27",
    "exclude": [
       "192.0.2.192/30",
       "192.0.2.196/32"
    ]
  }
}

{
  "ipam": {
    "type": "whereabouts",
    "range": "192.0.2.192/27",
    "exclude": [
       "192.0.2.192/30",
       "192.0.2.196/32"
    ]
  }
}

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24.5.2. Configuring SR-IOV additional network

You can configure an additional network that uses SR-IOV hardware by creating an SriovNetwork object. When you create an SriovNetwork object, the SR-IOV Network Operator automatically creates a NetworkAttachmentDefinition object.

Note

Do not modify or delete an SriovNetwork object if it is attached to any pods in a running state.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create a SriovNetwork object, and then save the YAML in the <name>.yaml file, where <name> is a name for this additional network. The object specification might resemble the following example:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: attach1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: net1
  networkNamespace: project2
  ipam: |-
    {
      "type": "host-local",
      "subnet": "10.56.217.0/24",
      "rangeStart": "10.56.217.171",
      "rangeEnd": "10.56.217.181",
      "gateway": "10.56.217.1"
    }

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: attach1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: net1
  networkNamespace: project2
  ipam: |-
    {
      "type": "host-local",
      "subnet": "10.56.217.0/24",
      "rangeStart": "10.56.217.171",
      "rangeEnd": "10.56.217.181",
      "gateway": "10.56.217.1"
    }

Copy to Clipboard

To create the object, enter the following command:
```
oc create -f <name>.yaml
```
```
$ oc create -f <name>.yaml
```
Copy to Clipboard
where <name> specifies the name of the additional network.
Optional: To confirm that the NetworkAttachmentDefinition object that is associated with the SriovNetwork object that you created in the previous step exists, enter the following command. Replace <namespace> with the networkNamespace you specified in the SriovNetwork object.
```
oc get net-attach-def -n <namespace>
```
```
$ oc get net-attach-def -n <namespace>
```
Copy to Clipboard

24.5.3. Next steps

Adding a pod to an SR-IOV additional network

24.6. Configuring an SR-IOV InfiniBand network attachment

You can configure an InfiniBand (IB) network attachment for an Single Root I/O Virtualization (SR-IOV) device in the cluster.

24.6.1. InfiniBand device configuration object

You can configure an InfiniBand (IB) network device by defining an SriovIBNetwork object.

The following YAML describes an SriovIBNetwork object:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovIBNetwork
metadata:
  name: <name> 
  namespace: openshift-sriov-network-operator 
spec:
  resourceName: <sriov_resource_name> 
  networkNamespace: <target_namespace> 
  ipam: |- 
    {}
  linkState: <link_state> 
  capabilities: <capabilities>

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovIBNetwork
metadata:
  name: <name>

1


  namespace: openshift-sriov-network-operator

2


spec:
  resourceName: <sriov_resource_name>

3


  networkNamespace: <target_namespace>

4


  ipam: |-

5


    {}
  linkState: <link_state>

6


  capabilities: <capabilities>

7

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1: A name for the object. The SR-IOV Network Operator creates a NetworkAttachmentDefinition object with same name.
2: The namespace where the SR-IOV Operator is installed.
3: The value for the spec.resourceName parameter from the SriovNetworkNodePolicy object that defines the SR-IOV hardware for this additional network.
4: The target namespace for the SriovIBNetwork object. Only pods in the target namespace can attach to the network device.
5: Optional: A configuration object for the IPAM CNI plugin as a YAML block scalar. The plugin manages IP address assignment for the attachment definition.
6: Optional: The link state of virtual function (VF). Allowed values are enable, disable and auto.
7: Optional: The capabilities to configure for this network. You can specify "{ "ips": true }" to enable IP address support or "{ "infinibandGUID": true }" to enable IB Global Unique Identifier (GUID) support.

24.6.1.1. Configuration of IP address assignment for an additional network

The IP address management (IPAM) Container Network Interface (CNI) plugin provides IP addresses for other CNI plugins.

You can use the following IP address assignment types:

Static assignment.
Dynamic assignment through a DHCP server. The DHCP server you specify must be reachable from the additional network.
Dynamic assignment through the Whereabouts IPAM CNI plugin.

24.6.1.1.1. Static IP address assignment configuration

The following table describes the configuration for static IP address assignment:

Table 24.9. ipam static configuration object
Field	Type	Description
`type`	`string`	The IPAM address type. The value `static` is required.
`addresses`	`array`	An array of objects specifying IP addresses to assign to the virtual interface. Both IPv4 and IPv6 IP addresses are supported.
`routes`	`array`	An array of objects specifying routes to configure inside the pod.
`dns`	`array`	Optional: An array of objects specifying the DNS configuration.

The addresses array requires objects with the following fields:

Table 24.10. ipam.addresses[] array
Field	Type	Description
`address`	`string`	An IP address and network prefix that you specify. For example, if you specify `10.10.21.10/24`, then the additional network is assigned an IP address of `10.10.21.10` and the netmask is `255.255.255.0`.
`gateway`	`string`	The default gateway to route egress network traffic to.

Table 24.11. ipam.routes[] array
Field	Type	Description
`dst`	`string`	The IP address range in CIDR format, such as `192.168.17.0/24` or `0.0.0.0/0` for the default route.
`gw`	`string`	The gateway where network traffic is routed.

Table 24.12. ipam.dns object
Field	Type	Description
`nameservers`	`array`	An array of one or more IP addresses for to send DNS queries to.
`domain`	`array`	The default domain to append to a hostname. For example, if the domain is set to `example.com`, a DNS lookup query for `example-host` is rewritten as `example-host.example.com`.
`search`	`array`	An array of domain names to append to an unqualified hostname, such as `example-host`, during a DNS lookup query.

Static IP address assignment configuration example

{
  "ipam": {
    "type": "static",
      "addresses": [
        {
          "address": "191.168.1.7/24"
        }
      ]
  }
}

{
  "ipam": {
    "type": "static",
      "addresses": [
        {
          "address": "191.168.1.7/24"
        }
      ]
  }
}

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24.6.1.1.2. Dynamic IP address (DHCP) assignment configuration

The following JSON describes the configuration for dynamic IP address address assignment with DHCP.

Renewal of DHCP leases

A pod obtains its original DHCP lease when it is created. The lease must be periodically renewed by a minimal DHCP server deployment running on the cluster.

To trigger the deployment of the DHCP server, you must create a shim network attachment by editing the Cluster Network Operator configuration, as in the following example:

Example shim network attachment definition

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks:
  - name: dhcp-shim
    namespace: default
    type: Raw
    rawCNIConfig: |-
      {
        "name": "dhcp-shim",
        "cniVersion": "0.3.1",
        "type": "bridge",
        "ipam": {
          "type": "dhcp"
        }
      }
  # ...

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  additionalNetworks:
  - name: dhcp-shim
    namespace: default
    type: Raw
    rawCNIConfig: |-
      {
        "name": "dhcp-shim",
        "cniVersion": "0.3.1",
        "type": "bridge",
        "ipam": {
          "type": "dhcp"
        }
      }
  # ...

Copy to Clipboard

Table 24.13. ipam DHCP configuration object
Field	Type	Description
`type`	`string`	The IPAM address type. The value `dhcp` is required.

Dynamic IP address (DHCP) assignment configuration example

{
  "ipam": {
    "type": "dhcp"
  }
}

{
  "ipam": {
    "type": "dhcp"
  }
}

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24.6.1.1.3. Dynamic IP address assignment configuration with Whereabouts

The Whereabouts CNI plugin allows the dynamic assignment of an IP address to an additional network without the use of a DHCP server.

The following table describes the configuration for dynamic IP address assignment with Whereabouts:

Table 24.14. ipam whereabouts configuration object
Field	Type	Description
`type`	`string`	The IPAM address type. The value `whereabouts` is required.
`range`	`string`	An IP address and range in CIDR notation. IP addresses are assigned from within this range of addresses.
`exclude`	`array`	Optional: A list of zero or more IP addresses and ranges in CIDR notation. IP addresses within an excluded address range are not assigned.

Dynamic IP address assignment configuration example that uses Whereabouts

{
  "ipam": {
    "type": "whereabouts",
    "range": "192.0.2.192/27",
    "exclude": [
       "192.0.2.192/30",
       "192.0.2.196/32"
    ]
  }
}

{
  "ipam": {
    "type": "whereabouts",
    "range": "192.0.2.192/27",
    "exclude": [
       "192.0.2.192/30",
       "192.0.2.196/32"
    ]
  }
}

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24.6.2. Configuring SR-IOV additional network

You can configure an additional network that uses SR-IOV hardware by creating an SriovIBNetwork object. When you create an SriovIBNetwork object, the SR-IOV Network Operator automatically creates a NetworkAttachmentDefinition object.

Note

Do not modify or delete an SriovIBNetwork object if it is attached to any pods in a running state.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create a SriovIBNetwork object, and then save the YAML in the <name>.yaml file, where <name> is a name for this additional network. The object specification might resemble the following example:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovIBNetwork
metadata:
  name: attach1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: net1
  networkNamespace: project2
  ipam: |-
    {
      "type": "host-local",
      "subnet": "10.56.217.0/24",
      "rangeStart": "10.56.217.171",
      "rangeEnd": "10.56.217.181",
      "gateway": "10.56.217.1"
    }

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovIBNetwork
metadata:
  name: attach1
  namespace: openshift-sriov-network-operator
spec:
  resourceName: net1
  networkNamespace: project2
  ipam: |-
    {
      "type": "host-local",
      "subnet": "10.56.217.0/24",
      "rangeStart": "10.56.217.171",
      "rangeEnd": "10.56.217.181",
      "gateway": "10.56.217.1"
    }

Copy to Clipboard

To create the object, enter the following command:
```
oc create -f <name>.yaml
```
```
$ oc create -f <name>.yaml
```
Copy to Clipboard
where <name> specifies the name of the additional network.
Optional: To confirm that the NetworkAttachmentDefinition object that is associated with the SriovIBNetwork object that you created in the previous step exists, enter the following command. Replace <namespace> with the networkNamespace you specified in the SriovIBNetwork object.
```
oc get net-attach-def -n <namespace>
```
```
$ oc get net-attach-def -n <namespace>
```
Copy to Clipboard

24.6.3. Next steps

Adding a pod to an SR-IOV additional network

24.7. Adding a pod to an SR-IOV additional network

You can add a pod to an existing Single Root I/O Virtualization (SR-IOV) network.

24.7.1. Runtime configuration for a network attachment

When attaching a pod to an additional network, you can specify a runtime configuration to make specific customizations for the pod. For example, you can request a specific MAC hardware address.

You specify the runtime configuration by setting an annotation in the pod specification. The annotation key is k8s.v1.cni.cncf.io/networks, and it accepts a JSON object that describes the runtime configuration.

24.7.1.1. Runtime configuration for an Ethernet-based SR-IOV attachment

The following JSON describes the runtime configuration options for an Ethernet-based SR-IOV network attachment.

[
  {
    "name": "<name>", 
    "mac": "<mac_address>", 
    "ips": ["<cidr_range>"] 
  }
]

[
  {
    "name": "<name>",

1


    "mac": "<mac_address>",

2


    "ips": ["<cidr_range>"]

3

}
]

Copy to Clipboard

1: The name of the SR-IOV network attachment definition CR.
2: Optional: The MAC address for the SR-IOV device that is allocated from the resource type defined in the SR-IOV network attachment definition CR. To use this feature, you also must specify { "mac": true } in the SriovNetwork object.
3: Optional: IP addresses for the SR-IOV device that is allocated from the resource type defined in the SR-IOV network attachment definition CR. Both IPv4 and IPv6 addresses are supported. To use this feature, you also must specify { "ips": true } in the SriovNetwork object.

Example runtime configuration

apiVersion: v1
kind: Pod
metadata:
  name: sample-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {
          "name": "net1",
          "mac": "20:04:0f:f1:88:01",
          "ips": ["192.168.10.1/24", "2001::1/64"]
        }
      ]
spec:
  containers:
  - name: sample-container
    image: <image>
    imagePullPolicy: IfNotPresent
    command: ["sleep", "infinity"]

apiVersion: v1
kind: Pod
metadata:
  name: sample-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {
          "name": "net1",
          "mac": "20:04:0f:f1:88:01",
          "ips": ["192.168.10.1/24", "2001::1/64"]
        }
      ]
spec:
  containers:
  - name: sample-container
    image: <image>
    imagePullPolicy: IfNotPresent
    command: ["sleep", "infinity"]

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24.7.1.2. Runtime configuration for an InfiniBand-based SR-IOV attachment

The following JSON describes the runtime configuration options for an InfiniBand-based SR-IOV network attachment.

[
  {
    "name": "<network_attachment>", 
    "infiniband-guid": "<guid>", 
    "ips": ["<cidr_range>"] 
  }
]

[
  {
    "name": "<network_attachment>",

1


    "infiniband-guid": "<guid>",

2


    "ips": ["<cidr_range>"]

3

}
]

Copy to Clipboard

1: The name of the SR-IOV network attachment definition CR.
2: The InfiniBand GUID for the SR-IOV device. To use this feature, you also must specify { "infinibandGUID": true } in the SriovIBNetwork object.
3: The IP addresses for the SR-IOV device that is allocated from the resource type defined in the SR-IOV network attachment definition CR. Both IPv4 and IPv6 addresses are supported. To use this feature, you also must specify { "ips": true } in the SriovIBNetwork object.

Example runtime configuration

apiVersion: v1
kind: Pod
metadata:
  name: sample-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {
          "name": "ib1",
          "infiniband-guid": "c2:11:22:33:44:55:66:77",
          "ips": ["192.168.10.1/24", "2001::1/64"]
        }
      ]
spec:
  containers:
  - name: sample-container
    image: <image>
    imagePullPolicy: IfNotPresent
    command: ["sleep", "infinity"]

apiVersion: v1
kind: Pod
metadata:
  name: sample-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {
          "name": "ib1",
          "infiniband-guid": "c2:11:22:33:44:55:66:77",
          "ips": ["192.168.10.1/24", "2001::1/64"]
        }
      ]
spec:
  containers:
  - name: sample-container
    image: <image>
    imagePullPolicy: IfNotPresent
    command: ["sleep", "infinity"]

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24.7.2. Adding a pod to an additional network

You can add a pod to an additional network. The pod continues to send normal cluster-related network traffic over the default network.

When a pod is created additional networks are attached to it. However, if a pod already exists, you cannot attach additional networks to it.

The pod must be in the same namespace as the additional network.

Note

The SR-IOV Network Resource Injector adds the resource field to the first container in a pod automatically.

If you are using an Intel network interface controller (NIC) in Data Plane Development Kit (DPDK) mode, only the first container in your pod is configured to access the NIC. Your SR-IOV additional network is configured for DPDK mode if the deviceType is set to vfio-pci in the SriovNetworkNodePolicy object.

You can work around this issue by either ensuring that the container that needs access to the NIC is the first container defined in the Pod object or by disabling the Network Resource Injector. For more information, see BZ#1990953.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster.
Install the SR-IOV Operator.
Create either an SriovNetwork object or an SriovIBNetwork object to attach the pod to.

Procedure

Add an annotation to the Pod object. Only one of the following annotation formats can be used:
1. To attach an additional network without any customization, add an annotation with the following format. Replace <network> with the name of the additional network to associate with the pod:
  metadata: annotations: k8s.v1.cni.cncf.io/networks: <network>[,<network>,...]
  1
  Copy to Clipboard
  1
  To specify more than one additional network, separate each network with a comma. Do not include whitespace between the comma. If you specify the same additional network multiple times, that pod will have multiple network interfaces attached to that network.
2. To attach an additional network with customizations, add an annotation with the following format:
  metadata: annotations: k8s.v1.cni.cncf.io/networks: |- [ { "name": "<network>",
  1
  "namespace": "<namespace>",
  2
  "default-route": ["<default-route>"]
  3
  } ]
  Copy to Clipboard
  1
  Specify the name of the additional network defined by a NetworkAttachmentDefinition object.
  2
  Specify the namespace where the NetworkAttachmentDefinition object is defined.
  3
  Optional: Specify an override for the default route, such as 192.168.17.1.
To create the pod, enter the following command. Replace <name> with the name of the pod.
```
oc create -f <name>.yaml
```
```
$ oc create -f <name>.yaml
```
Copy to Clipboard

Optional: To Confirm that the annotation exists in the Pod CR, enter the following command, replacing <name> with the name of the pod.

oc get pod <name> -o yaml

$ oc get pod <name> -o yaml

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In the following example, the example-pod pod is attached to the net1 additional network:

oc get pod example-pod -o yaml

$ oc get pod example-pod -o yaml
apiVersion: v1
kind: Pod
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: macvlan-bridge
    k8s.v1.cni.cncf.io/network-status: |-

1


      [{
          "name": "openshift-sdn",
          "interface": "eth0",
          "ips": [
              "10.128.2.14"
          ],
          "default": true,
          "dns": {}
      },{
          "name": "macvlan-bridge",
          "interface": "net1",
          "ips": [
              "20.2.2.100"
          ],
          "mac": "22:2f:60:a5:f8:00",
          "dns": {}
      }]
  name: example-pod
  namespace: default
spec:
  ...
status:
  ...

Copy to Clipboard

1: The k8s.v1.cni.cncf.io/network-status parameter is a JSON array of objects. Each object describes the status of an additional network attached to the pod. The annotation value is stored as a plain text value.

24.7.3. Creating a non-uniform memory access (NUMA) aligned SR-IOV pod

You can create a NUMA aligned SR-IOV pod by restricting SR-IOV and the CPU resources allocated from the same NUMA node with restricted or single-numa-node Topology Manager polices.

Prerequisites

You have installed the OpenShift CLI (oc).
You have configured the CPU Manager policy to static. For more information on CPU Manager, see the "Additional resources" section.
You have configured the Topology Manager policy to single-numa-node.
Note
When single-numa-node is unable to satisfy the request, you can configure the Topology Manager policy to restricted. For more flexible SR-IOV network resource scheduling, see Excluding SR-IOV network topology during NUMA-aware scheduling in the Additional resources section.

Procedure

Create the following SR-IOV pod spec, and then save the YAML in the <name>-sriov-pod.yaml file. Replace <name> with a name for this pod.

The following example shows an SR-IOV pod spec:

apiVersion: v1
kind: Pod
metadata:
  name: sample-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: <name> 
spec:
  containers:
  - name: sample-container
    image: <image> 
    command: ["sleep", "infinity"]
    resources:
      limits:
        memory: "1Gi" 
        cpu: "2" 
      requests:
        memory: "1Gi"
        cpu: "2"

apiVersion: v1
kind: Pod
metadata:
  name: sample-pod
  annotations:
    k8s.v1.cni.cncf.io/networks: <name>

1


spec:
  containers:
  - name: sample-container
    image: <image>

2


    command: ["sleep", "infinity"]
    resources:
      limits:
        memory: "1Gi"

3


        cpu: "2"

4


      requests:
        memory: "1Gi"
        cpu: "2"

Copy to Clipboard

1: Replace <name> with the name of the SR-IOV network attachment definition CR.
2: Replace <image> with the name of the sample-pod image.
3: To create the SR-IOV pod with guaranteed QoS, set memory limits equal to memory requests.
4: To create the SR-IOV pod with guaranteed QoS, set cpu limits equals to cpu requests.

Create the sample SR-IOV pod by running the following command:
```
oc create -f <filename>
```
```
$ oc create -f <filename> 
```
1
Copy to Clipboard
1
Replace <filename> with the name of the file you created in the previous step.
Confirm that the sample-pod is configured with guaranteed QoS.
```
oc describe pod sample-pod
```
```
$ oc describe pod sample-pod
```
Copy to Clipboard

Confirm that the sample-pod is allocated with exclusive CPUs.

oc exec sample-pod -- cat /sys/fs/cgroup/cpuset/cpuset.cpus

$ oc exec sample-pod -- cat /sys/fs/cgroup/cpuset/cpuset.cpus

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Confirm that the SR-IOV device and CPUs that are allocated for the sample-pod are on the same NUMA node.
```
oc exec sample-pod -- cat /sys/fs/cgroup/cpuset/cpuset.cpus
```
```
$ oc exec sample-pod -- cat /sys/fs/cgroup/cpuset/cpuset.cpus
```
Copy to Clipboard

24.7.4. A test pod template for clusters that use SR-IOV on OpenStack

The following testpmd pod demonstrates container creation with huge pages, reserved CPUs, and the SR-IOV port.

An example testpmd pod

apiVersion: v1
kind: Pod
metadata:
  name: testpmd-sriov
  namespace: mynamespace
  annotations:
    cpu-load-balancing.crio.io: "disable"
    cpu-quota.crio.io: "disable"
# ...
spec:
  containers:
  - name: testpmd
    command: ["sleep", "99999"]
    image: registry.redhat.io/openshift4/dpdk-base-rhel8:v4.9
    securityContext:
      capabilities:
        add: ["IPC_LOCK","SYS_ADMIN"]
      privileged: true
      runAsUser: 0
    resources:
      requests:
        memory: 1000Mi
        hugepages-1Gi: 1Gi
        cpu: '2'
        openshift.io/sriov1: 1
      limits:
        hugepages-1Gi: 1Gi
        cpu: '2'
        memory: 1000Mi
        openshift.io/sriov1: 1
    volumeMounts:
      - mountPath: /dev/hugepages
        name: hugepage
        readOnly: False
  runtimeClassName: performance-cnf-performanceprofile 
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

apiVersion: v1
kind: Pod
metadata:
  name: testpmd-sriov
  namespace: mynamespace
  annotations:
    cpu-load-balancing.crio.io: "disable"
    cpu-quota.crio.io: "disable"
# ...
spec:
  containers:
  - name: testpmd
    command: ["sleep", "99999"]
    image: registry.redhat.io/openshift4/dpdk-base-rhel8:v4.9
    securityContext:
      capabilities:
        add: ["IPC_LOCK","SYS_ADMIN"]
      privileged: true
      runAsUser: 0
    resources:
      requests:
        memory: 1000Mi
        hugepages-1Gi: 1Gi
        cpu: '2'
        openshift.io/sriov1: 1
      limits:
        hugepages-1Gi: 1Gi
        cpu: '2'
        memory: 1000Mi
        openshift.io/sriov1: 1
    volumeMounts:
      - mountPath: /dev/hugepages
        name: hugepage
        readOnly: False
  runtimeClassName: performance-cnf-performanceprofile

1


  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

Copy to Clipboard

1: This example assumes that the name of the performance profile is cnf-performance profile.

24.8. Configuring interface-level network sysctl settings for SR-IOV networks

As a cluster administrator, you can modify interface-level network sysctls using the tuning Container Network Interface (CNI) meta plugin for a pod connected to a SR-IOV network device.

24.8.1. Labeling nodes with an SR-IOV enabled NIC

If you want to enable SR-IOV on only SR-IOV capable nodes there are a couple of ways to do this:

Install the Node Feature Discovery (NFD) Operator. NFD detects the presence of SR-IOV enabled NICs and labels the nodes with node.alpha.kubernetes-incubator.io/nfd-network-sriov.capable = true.
Examine the SriovNetworkNodeState CR for each node. The interfaces stanza includes a list of all of the SR-IOV devices discovered by the SR-IOV Network Operator on the worker node. Label each node with feature.node.kubernetes.io/network-sriov.capable: "true" by using the following command:
```
$ oc label node <node_name> feature.node.kubernetes.io/network-sriov.capable="true"
```
```
$ oc label node <node_name> feature.node.kubernetes.io/network-sriov.capable="true"
```
Copy to Clipboard
Note
You can label the nodes with whatever name you want.

24.8.2. Setting one sysctl flag

You can set interface-level network sysctl settings for a pod connected to a SR-IOV network device.

In this example, net.ipv4.conf.IFNAME.accept_redirects is set to 1 on the created virtual interfaces.

The sysctl-tuning-test is a namespace used in this example.

Use the following command to create the sysctl-tuning-test namespace:
```
oc create namespace sysctl-tuning-test
```
```
$ oc create namespace sysctl-tuning-test
```
Copy to Clipboard

24.8.2.1. Setting one sysctl flag on nodes with SR-IOV network devices

The SR-IOV Network Operator adds the SriovNetworkNodePolicy.sriovnetwork.openshift.io custom resource definition (CRD) to OpenShift Container Platform. You can configure an SR-IOV network device by creating a SriovNetworkNodePolicy custom resource (CR).

Note

When applying the configuration specified in a SriovNetworkNodePolicy object, the SR-IOV Operator might drain and reboot the nodes.

It can take several minutes for a configuration change to apply.

Follow this procedure to create a SriovNetworkNodePolicy custom resource (CR).

Procedure

Create an SriovNetworkNodePolicy custom resource (CR). For example, save the following YAML as the file policyoneflag-sriov-node-network.yaml:
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policyoneflag 
  namespace: openshift-sriov-network-operator 
spec:
  resourceName: policyoneflag 
  nodeSelector: 
    feature.node.kubernetes.io/network-sriov.capable="true"
  priority: 10 
  numVfs: 5 
  nicSelector: 
    pfNames: ["ens5"] 
  deviceType: "netdevice" 
  isRdma: false 
```
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policyoneflag 
```
1
```
  namespace: openshift-sriov-network-operator 
```
2
```
spec:
  resourceName: policyoneflag 
```
3
```
  nodeSelector: 
```
4
```
    feature.node.kubernetes.io/network-sriov.capable="true"
  priority: 10 
```
5
```
  numVfs: 5 
```
6
```
  nicSelector: 
```
7
```
    pfNames: ["ens5"] 
```
8
```
  deviceType: "netdevice" 
```
9
```
  isRdma: false 
```
10
Copy to Clipboard
1
The name for the custom resource object.
2
The namespace where the SR-IOV Network Operator is installed.
3
The resource name of the SR-IOV network device plugin. You can create multiple SR-IOV network node policies for a resource name.
4
The node selector specifies the nodes to configure. Only SR-IOV network devices on the selected nodes are configured. The SR-IOV Container Network Interface (CNI) plugin and device plugin are deployed on selected nodes only.
5
Optional: The priority is an integer value between 0 and 99. A smaller value receives higher priority. For example, a priority of 10 is a higher priority than 99. The default value is 99.
6
The number of the virtual functions (VFs) to create for the SR-IOV physical network device. For an Intel network interface controller (NIC), the number of VFs cannot be larger than the total VFs supported by the device. For a Mellanox NIC, the number of VFs cannot be larger than 127.
7
The NIC selector identifies the device for the Operator to configure. You do not have to specify values for all the parameters. It is recommended to identify the network device with enough precision to avoid selecting a device unintentionally. If you specify rootDevices, you must also specify a value for vendor, deviceID, or pfNames. If you specify both pfNames and rootDevices at the same time, ensure that they refer to the same device. If you specify a value for netFilter, then you do not need to specify any other parameter because a network ID is unique.
8
Optional: An array of one or more physical function (PF) names for the device.
9
Optional: The driver type for the virtual functions. The only allowed value is netdevice. For a Mellanox NIC to work in DPDK mode on bare metal nodes, set isRdma to true.
10
Optional: Configures whether to enable remote direct memory access (RDMA) mode. The default value is false. If the isRdma parameter is set to true, you can continue to use the RDMA-enabled VF as a normal network device. A device can be used in either mode. Set isRdma to true and additionally set needVhostNet to true to configure a Mellanox NIC for use with Fast Datapath DPDK applications.
Note
The vfio-pci driver type is not supported.
Create the SriovNetworkNodePolicy object:
```
oc create -f policyoneflag-sriov-node-network.yaml
```
```
$ oc create -f policyoneflag-sriov-node-network.yaml
```
Copy to Clipboard
After applying the configuration update, all the pods in sriov-network-operator namespace change to the Running status.

To verify that the SR-IOV network device is configured, enter the following command. Replace <node_name> with the name of a node with the SR-IOV network device that you just configured.

oc get sriovnetworknodestates -n openshift-sriov-network-operator <node_name> -o jsonpath='{.status.syncStatus}'

$ oc get sriovnetworknodestates -n openshift-sriov-network-operator <node_name> -o jsonpath='{.status.syncStatus}'

Copy to Clipboard

Example output

Succeeded

Succeeded

Copy to Clipboard

24.8.2.2. Configuring sysctl on a SR-IOV network

You can set interface specific sysctl settings on virtual interfaces created by SR-IOV by adding the tuning configuration to the optional metaPlugins parameter of the SriovNetwork resource.

The SR-IOV Network Operator manages additional network definitions. When you specify an additional SR-IOV network to create, the SR-IOV Network Operator creates the NetworkAttachmentDefinition custom resource (CR) automatically.

Note

Do not edit NetworkAttachmentDefinition custom resources that the SR-IOV Network Operator manages. Doing so might disrupt network traffic on your additional network.

To change the interface-level network net.ipv4.conf.IFNAME.accept_redirects sysctl settings, create an additional SR-IOV network with the Container Network Interface (CNI) tuning plugin.

Prerequisites

Install the OpenShift Container Platform CLI (oc).
Log in to the OpenShift Container Platform cluster as a user with cluster-admin privileges.

Procedure

Create the SriovNetwork custom resource (CR) for the additional SR-IOV network attachment and insert the metaPlugins configuration, as in the following example CR. Save the YAML as the file sriov-network-interface-sysctl.yaml.
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: onevalidflag 
  namespace: openshift-sriov-network-operator 
spec:
  resourceName: policyoneflag 
  networkNamespace: sysctl-tuning-test 
  ipam: '{ "type": "static" }' 
  capabilities: '{ "mac": true, "ips": true }' 
  metaPlugins : | 
    {
      "type": "tuning",
      "capabilities":{
        "mac":true
      },
      "sysctl":{
         "net.ipv4.conf.IFNAME.accept_redirects": "1"
      }
    }
```
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: onevalidflag 
```
1
```
  namespace: openshift-sriov-network-operator 
```
2
```
spec:
  resourceName: policyoneflag 
```
3
```
  networkNamespace: sysctl-tuning-test 
```
4
```
  ipam: '{ "type": "static" }' 
```
5
```
  capabilities: '{ "mac": true, "ips": true }' 
```
6
```
  metaPlugins : | 
```
7
```
    {
      "type": "tuning",
      "capabilities":{
        "mac":true
      },
      "sysctl":{
         "net.ipv4.conf.IFNAME.accept_redirects": "1"
      }
    }
```
Copy to Clipboard
1
A name for the object. The SR-IOV Network Operator creates a NetworkAttachmentDefinition object with same name.
2
The namespace where the SR-IOV Network Operator is installed.
3
The value for the spec.resourceName parameter from the SriovNetworkNodePolicy object that defines the SR-IOV hardware for this additional network.
4
The target namespace for the SriovNetwork object. Only pods in the target namespace can attach to the additional network.
5
A configuration object for the IPAM CNI plugin as a YAML block scalar. The plugin manages IP address assignment for the attachment definition.
6
Optional: Set capabilities for the additional network. You can specify "{ "ips": true }" to enable IP address support or "{ "mac": true }" to enable MAC address support.
7
Optional: The metaPlugins parameter is used to add additional capabilities to the device. In this use case set the type field to tuning. Specify the interface-level network sysctl you want to set in the sysctl field.

Create the SriovNetwork resource:

oc create -f sriov-network-interface-sysctl.yaml

$ oc create -f sriov-network-interface-sysctl.yaml

Copy to Clipboard

Verifying that the NetworkAttachmentDefinition CR is successfully created

Confirm that the SR-IOV Network Operator created the NetworkAttachmentDefinition CR by running the following command:
```
oc get network-attachment-definitions -n <namespace>
```
```
$ oc get network-attachment-definitions -n <namespace> 
```
1
Copy to Clipboard
1
Replace <namespace> with the value for networkNamespace that you specified in the SriovNetwork object. For example, sysctl-tuning-test.
Example output
```
NAME                                  AGE
onevalidflag                          14m
```
```
NAME                                  AGE
onevalidflag                          14m
```
Copy to Clipboard
Note
There might be a delay before the SR-IOV Network Operator creates the CR.

Verifying that the additional SR-IOV network attachment is successful

To verify that the tuning CNI is correctly configured and the additional SR-IOV network attachment is attached, do the following:

Create a Pod CR. Save the following YAML as the file examplepod.yaml:

apiVersion: v1
kind: Pod
metadata:
  name: tunepod
  namespace: sysctl-tuning-test
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {
          "name": "onevalidflag",  
          "mac": "0a:56:0a:83:04:0c", 
          "ips": ["10.100.100.200/24"] 
       }
      ]
spec:
  containers:
  - name: podexample
    image: centos
    command: ["/bin/bash", "-c", "sleep INF"]
    securityContext:
      runAsUser: 2000
      runAsGroup: 3000
      allowPrivilegeEscalation: false
      capabilities:
        drop: ["ALL"]
  securityContext:
    runAsNonRoot: true
    seccompProfile:
      type: RuntimeDefault

apiVersion: v1
kind: Pod
metadata:
  name: tunepod
  namespace: sysctl-tuning-test
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {
          "name": "onevalidflag",

1


          "mac": "0a:56:0a:83:04:0c",

2


          "ips": ["10.100.100.200/24"]

3


       }
      ]
spec:
  containers:
  - name: podexample
    image: centos
    command: ["/bin/bash", "-c", "sleep INF"]
    securityContext:
      runAsUser: 2000
      runAsGroup: 3000
      allowPrivilegeEscalation: false
      capabilities:
        drop: ["ALL"]
  securityContext:
    runAsNonRoot: true
    seccompProfile:
      type: RuntimeDefault

Copy to Clipboard

1: The name of the SR-IOV network attachment definition CR.
2: Optional: The MAC address for the SR-IOV device that is allocated from the resource type defined in the SR-IOV network attachment definition CR. To use this feature, you also must specify { "mac": true } in the SriovNetwork object.
3: Optional: IP addresses for the SR-IOV device that are allocated from the resource type defined in the SR-IOV network attachment definition CR. Both IPv4 and IPv6 addresses are supported. To use this feature, you also must specify { "ips": true } in the SriovNetwork object.

Create the Pod CR:

oc apply -f examplepod.yaml

$ oc apply -f examplepod.yaml

Copy to Clipboard

Verify that the pod is created by running the following command:

oc get pod -n sysctl-tuning-test

$ oc get pod -n sysctl-tuning-test

Copy to Clipboard

Example output

NAME      READY   STATUS    RESTARTS   AGE
tunepod   1/1     Running   0          47s

NAME      READY   STATUS    RESTARTS   AGE
tunepod   1/1     Running   0          47s

Copy to Clipboard

Log in to the pod by running the following command:

oc rsh -n sysctl-tuning-test tunepod

$ oc rsh -n sysctl-tuning-test tunepod

Copy to Clipboard

Verify the values of the configured sysctl flag. Find the value net.ipv4.conf.IFNAME.accept_redirects by running the following command::
```
sysctl net.ipv4.conf.net1.accept_redirects
```
```
$ sysctl net.ipv4.conf.net1.accept_redirects
```
Copy to Clipboard
Example output
```
net.ipv4.conf.net1.accept_redirects = 1
```
```
net.ipv4.conf.net1.accept_redirects = 1
```
Copy to Clipboard

24.8.3. Configuring sysctl settings for pods associated with bonded SR-IOV interface flag

You can set interface-level network sysctl settings for a pod connected to a bonded SR-IOV network device.

In this example, the specific network interface-level sysctl settings that can be configured are set on the bonded interface.

The sysctl-tuning-test is a namespace used in this example.

Use the following command to create the sysctl-tuning-test namespace:
```
oc create namespace sysctl-tuning-test
```
```
$ oc create namespace sysctl-tuning-test
```
Copy to Clipboard

24.8.3.1. Setting all sysctl flag on nodes with bonded SR-IOV network devices

The SR-IOV Network Operator adds the SriovNetworkNodePolicy.sriovnetwork.openshift.io custom resource definition (CRD) to OpenShift Container Platform. You can configure an SR-IOV network device by creating a SriovNetworkNodePolicy custom resource (CR).

Note

When applying the configuration specified in a SriovNetworkNodePolicy object, the SR-IOV Operator might drain the nodes, and in some cases, reboot nodes.

It might take several minutes for a configuration change to apply.

Follow this procedure to create a SriovNetworkNodePolicy custom resource (CR).

Procedure

Create an SriovNetworkNodePolicy custom resource (CR). Save the following YAML as the file policyallflags-sriov-node-network.yaml. Replace policyallflags with the name for the configuration.
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policyallflags 
  namespace: openshift-sriov-network-operator 
spec:
  resourceName: policyallflags 
  nodeSelector: 
    node.alpha.kubernetes-incubator.io/nfd-network-sriov.capable = `true`
  priority: 10 
  numVfs: 5 
  nicSelector: 
    pfNames: ["ens1f0"]  
  deviceType: "netdevice" 
  isRdma: false 
```
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policyallflags 
```
1
```
  namespace: openshift-sriov-network-operator 
```
2
```
spec:
  resourceName: policyallflags 
```
3
```
  nodeSelector: 
```
4
```
    node.alpha.kubernetes-incubator.io/nfd-network-sriov.capable = `true`
  priority: 10 
```
5
```
  numVfs: 5 
```
6
```
  nicSelector: 
```
7
```
    pfNames: ["ens1f0"]  
```
8
```
  deviceType: "netdevice" 
```
9
```
  isRdma: false 
```
10
Copy to Clipboard
1
The name for the custom resource object.
2
The namespace where the SR-IOV Network Operator is installed.
3
The resource name of the SR-IOV network device plugin. You can create multiple SR-IOV network node policies for a resource name.
4
The node selector specifies the nodes to configure. Only SR-IOV network devices on the selected nodes are configured. The SR-IOV Container Network Interface (CNI) plugin and device plugin are deployed on selected nodes only.
5
Optional: The priority is an integer value between 0 and 99. A smaller value receives higher priority. For example, a priority of 10 is a higher priority than 99. The default value is 99.
6
The number of virtual functions (VFs) to create for the SR-IOV physical network device. For an Intel network interface controller (NIC), the number of VFs cannot be larger than the total VFs supported by the device. For a Mellanox NIC, the number of VFs cannot be larger than 127.
7
The NIC selector identifies the device for the Operator to configure. You do not have to specify values for all the parameters. It is recommended to identify the network device with enough precision to avoid selecting a device unintentionally. If you specify rootDevices, you must also specify a value for vendor, deviceID, or pfNames. If you specify both pfNames and rootDevices at the same time, ensure that they refer to the same device. If you specify a value for netFilter, then you do not need to specify any other parameter because a network ID is unique.
8
Optional: An array of one or more physical function (PF) names for the device.
9
Optional: The driver type for the virtual functions. The only allowed value is netdevice. For a Mellanox NIC to work in DPDK mode on bare metal nodes, set isRdma to true.
10
Optional: Configures whether to enable remote direct memory access (RDMA) mode. The default value is false. If the isRdma parameter is set to true, you can continue to use the RDMA-enabled VF as a normal network device. A device can be used in either mode. Set isRdma to true and additionally set needVhostNet to true to configure a Mellanox NIC for use with Fast Datapath DPDK applications.
Note
The vfio-pci driver type is not supported.
Create the SriovNetworkNodePolicy object:
```
oc create -f policyallflags-sriov-node-network.yaml
```
```
$ oc create -f policyallflags-sriov-node-network.yaml
```
Copy to Clipboard
After applying the configuration update, all the pods in sriov-network-operator namespace change to the Running status.

To verify that the SR-IOV network device is configured, enter the following command. Replace <node_name> with the name of a node with the SR-IOV network device that you just configured.

oc get sriovnetworknodestates -n openshift-sriov-network-operator <node_name> -o jsonpath='{.status.syncStatus}'

$ oc get sriovnetworknodestates -n openshift-sriov-network-operator <node_name> -o jsonpath='{.status.syncStatus}'

Copy to Clipboard

Example output

Succeeded

Succeeded

Copy to Clipboard

24.8.3.2. Configuring sysctl on a bonded SR-IOV network

You can set interface specific sysctl settings on a bonded interface created from two SR-IOV interfaces. Do this by adding the tuning configuration to the optional Plugins parameter of the bond network attachment definition.

Note

Do not edit NetworkAttachmentDefinition custom resources that the SR-IOV Network Operator manages. Doing so might disrupt network traffic on your additional network.

To change specific interface-level network sysctl settings create the SriovNetwork custom resource (CR) with the Container Network Interface (CNI) tuning plugin by using the following procedure.

Prerequisites

Install the OpenShift Container Platform CLI (oc).
Log in to the OpenShift Container Platform cluster as a user with cluster-admin privileges.

Procedure

Create the SriovNetwork custom resource (CR) for the bonded interface as in the following example CR. Save the YAML as the file sriov-network-attachment.yaml.
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: allvalidflags 
  namespace: openshift-sriov-network-operator 
spec:
  resourceName: policyallflags 
  networkNamespace: sysctl-tuning-test 
  capabilities: '{ "mac": true, "ips": true }' 
```
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: allvalidflags 
```
1
```
  namespace: openshift-sriov-network-operator 
```
2
```
spec:
  resourceName: policyallflags 
```
3
```
  networkNamespace: sysctl-tuning-test 
```
4
```
  capabilities: '{ "mac": true, "ips": true }' 
```
5
Copy to Clipboard
1
A name for the object. The SR-IOV Network Operator creates a NetworkAttachmentDefinition object with same name.
2
The namespace where the SR-IOV Network Operator is installed.
3
The value for the spec.resourceName parameter from the SriovNetworkNodePolicy object that defines the SR-IOV hardware for this additional network.
4
The target namespace for the SriovNetwork object. Only pods in the target namespace can attach to the additional network.
5
Optional: The capabilities to configure for this additional network. You can specify "{ "ips": true }" to enable IP address support or "{ "mac": true }" to enable MAC address support.

Create the SriovNetwork resource:

oc create -f sriov-network-attachment.yaml

$ oc create -f sriov-network-attachment.yaml

Copy to Clipboard

Create a bond network attachment definition as in the following example CR. Save the YAML as the file sriov-bond-network-interface.yaml.

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: bond-sysctl-network
  namespace: sysctl-tuning-test
spec:
  config: '{
  "cniVersion":"0.4.0",
  "name":"bound-net",
  "plugins":[
    {
      "type":"bond", 
      "mode": "active-backup", 
      "failOverMac": 1, 
      "linksInContainer": true, 
      "miimon": "100",
      "links": [ 
        {"name": "net1"},
        {"name": "net2"}
      ],
      "ipam":{ 
        "type":"static"
      }
    },
    {
      "type":"tuning", 
      "capabilities":{
        "mac":true
      },
      "sysctl":{
        "net.ipv4.conf.IFNAME.accept_redirects": "0",
        "net.ipv4.conf.IFNAME.accept_source_route": "0",
        "net.ipv4.conf.IFNAME.disable_policy": "1",
        "net.ipv4.conf.IFNAME.secure_redirects": "0",
        "net.ipv4.conf.IFNAME.send_redirects": "0",
        "net.ipv6.conf.IFNAME.accept_redirects": "0",
        "net.ipv6.conf.IFNAME.accept_source_route": "1",
        "net.ipv6.neigh.IFNAME.base_reachable_time_ms": "20000",
        "net.ipv6.neigh.IFNAME.retrans_time_ms": "2000"
      }
    }
  ]
}'

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: bond-sysctl-network
  namespace: sysctl-tuning-test
spec:
  config: '{
  "cniVersion":"0.4.0",
  "name":"bound-net",
  "plugins":[
    {
      "type":"bond",

1


      "mode": "active-backup",

2


      "failOverMac": 1,

3


      "linksInContainer": true,

4


      "miimon": "100",
      "links": [

5


        {"name": "net1"},
        {"name": "net2"}
      ],
      "ipam":{

6


        "type":"static"
      }
    },
    {
      "type":"tuning",

7


      "capabilities":{
        "mac":true
      },
      "sysctl":{
        "net.ipv4.conf.IFNAME.accept_redirects": "0",
        "net.ipv4.conf.IFNAME.accept_source_route": "0",
        "net.ipv4.conf.IFNAME.disable_policy": "1",
        "net.ipv4.conf.IFNAME.secure_redirects": "0",
        "net.ipv4.conf.IFNAME.send_redirects": "0",
        "net.ipv6.conf.IFNAME.accept_redirects": "0",
        "net.ipv6.conf.IFNAME.accept_source_route": "1",
        "net.ipv6.neigh.IFNAME.base_reachable_time_ms": "20000",
        "net.ipv6.neigh.IFNAME.retrans_time_ms": "2000"
      }
    }
  ]
}'

Copy to Clipboard

The type is bond.

The mode attribute specifies the bonding mode. The bonding modes supported are:

balance-rr - 0
active-backup - 1
balance-xor - 2
For balance-rr or balance-xor modes, you must set the trust mode to on for the SR-IOV virtual function.

The failover attribute is mandatory for active-backup mode.

4

The linksInContainer=true flag informs the Bond CNI that the required interfaces are to be found inside the container. By default, Bond CNI looks for these interfaces on the host which does not work for integration with SRIOV and Multus.

5

The links section defines which interfaces will be used to create the bond. By default, Multus names the attached interfaces as: "net", plus a consecutive number, starting with one.

6

A configuration object for the IPAM CNI plugin as a YAML block scalar. The plugin manages IP address assignment for the attachment definition. In this pod example IP addresses are configured manually, so in this case,ipam is set to static.

7

Add additional capabilities to the device. For example, set the type field to tuning. Specify the interface-level network sysctl you want to set in the sysctl field. This example sets all interface-level network sysctl settings that can be set.

Create the bond network attachment resource:

oc create -f sriov-bond-network-interface.yaml

$ oc create -f sriov-bond-network-interface.yaml

Copy to Clipboard

Verifying that the NetworkAttachmentDefinition CR is successfully created

Confirm that the SR-IOV Network Operator created the NetworkAttachmentDefinition CR by running the following command:
```
oc get network-attachment-definitions -n <namespace>
```
```
$ oc get network-attachment-definitions -n <namespace> 
```
1
Copy to Clipboard
1
Replace <namespace> with the networkNamespace that you specified when configuring the network attachment, for example, sysctl-tuning-test.
Example output
```
NAME                          AGE
bond-sysctl-network           22m
allvalidflags                 47m
```
```
NAME                          AGE
bond-sysctl-network           22m
allvalidflags                 47m
```
Copy to Clipboard
Note
There might be a delay before the SR-IOV Network Operator creates the CR.

Verifying that the additional SR-IOV network resource is successful

To verify that the tuning CNI is correctly configured and the additional SR-IOV network attachment is attached, do the following:

Create a Pod CR. For example, save the following YAML as the file examplepod.yaml:

apiVersion: v1
kind: Pod
metadata:
  name: tunepod
  namespace: sysctl-tuning-test
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {"name": "allvalidflags"}, 
        {"name": "allvalidflags"},
        {
          "name": "bond-sysctl-network",
          "interface": "bond0",
          "mac": "0a:56:0a:83:04:0c", 
          "ips": ["10.100.100.200/24"] 
       }
      ]
spec:
  containers:
  - name: podexample
    image: centos
    command: ["/bin/bash", "-c", "sleep INF"]
    securityContext:
      runAsUser: 2000
      runAsGroup: 3000
      allowPrivilegeEscalation: false
      capabilities:
        drop: ["ALL"]
  securityContext:
    runAsNonRoot: true
    seccompProfile:
      type: RuntimeDefault

apiVersion: v1
kind: Pod
metadata:
  name: tunepod
  namespace: sysctl-tuning-test
  annotations:
    k8s.v1.cni.cncf.io/networks: |-
      [
        {"name": "allvalidflags"},

1


        {"name": "allvalidflags"},
        {
          "name": "bond-sysctl-network",
          "interface": "bond0",
          "mac": "0a:56:0a:83:04:0c",

2


          "ips": ["10.100.100.200/24"]

3


       }
      ]
spec:
  containers:
  - name: podexample
    image: centos
    command: ["/bin/bash", "-c", "sleep INF"]
    securityContext:
      runAsUser: 2000
      runAsGroup: 3000
      allowPrivilegeEscalation: false
      capabilities:
        drop: ["ALL"]
  securityContext:
    runAsNonRoot: true
    seccompProfile:
      type: RuntimeDefault

Copy to Clipboard

1: The name of the SR-IOV network attachment definition CR.
2: Optional: The MAC address for the SR-IOV device that is allocated from the resource type defined in the SR-IOV network attachment definition CR. To use this feature, you also must specify { "mac": true } in the SriovNetwork object.
3: Optional: IP addresses for the SR-IOV device that are allocated from the resource type defined in the SR-IOV network attachment definition CR. Both IPv4 and IPv6 addresses are supported. To use this feature, you also must specify { "ips": true } in the SriovNetwork object.

Apply the YAML:

oc apply -f examplepod.yaml

$ oc apply -f examplepod.yaml

Copy to Clipboard

Verify that the pod is created by running the following command:

oc get pod -n sysctl-tuning-test

$ oc get pod -n sysctl-tuning-test

Copy to Clipboard

Example output

NAME      READY   STATUS    RESTARTS   AGE
tunepod   1/1     Running   0          47s

NAME      READY   STATUS    RESTARTS   AGE
tunepod   1/1     Running   0          47s

Copy to Clipboard

Log in to the pod by running the following command:

oc rsh -n sysctl-tuning-test tunepod

$ oc rsh -n sysctl-tuning-test tunepod

Copy to Clipboard

Verify the values of the configured sysctl flag. Find the value net.ipv6.neigh.IFNAME.base_reachable_time_ms by running the following command::

sysctl net.ipv6.neigh.bond0.base_reachable_time_ms

$ sysctl net.ipv6.neigh.bond0.base_reachable_time_ms

Copy to Clipboard

Example output

net.ipv6.neigh.bond0.base_reachable_time_ms = 20000

net.ipv6.neigh.bond0.base_reachable_time_ms = 20000

Copy to Clipboard

24.9. Using high performance multicast

You can use multicast on your Single Root I/O Virtualization (SR-IOV) hardware network.

24.9.1. High performance multicast

The OpenShift SDN network plugin supports multicast between pods on the default network. This is best used for low-bandwidth coordination or service discovery, and not high-bandwidth applications. For applications such as streaming media, like Internet Protocol television (IPTV) and multipoint videoconferencing, you can utilize Single Root I/O Virtualization (SR-IOV) hardware to provide near-native performance.

When using additional SR-IOV interfaces for multicast:

Multicast packages must be sent or received by a pod through the additional SR-IOV interface.
The physical network which connects the SR-IOV interfaces decides the multicast routing and topology, which is not controlled by OpenShift Container Platform.

24.9.2. Configuring an SR-IOV interface for multicast

The follow procedure creates an example SR-IOV interface for multicast.

Prerequisites

Install the OpenShift CLI (oc).
You must log in to the cluster with a user that has the cluster-admin role.

Procedure

Create a SriovNetworkNodePolicy object:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-example
  namespace: openshift-sriov-network-operator
spec:
  resourceName: example
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 4
  nicSelector:
    vendor: "8086"
    pfNames: ['ens803f0']
    rootDevices: ['0000:86:00.0']

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: policy-example
  namespace: openshift-sriov-network-operator
spec:
  resourceName: example
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 4
  nicSelector:
    vendor: "8086"
    pfNames: ['ens803f0']
    rootDevices: ['0000:86:00.0']

Copy to Clipboard

Create a SriovNetwork object:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: net-example
  namespace: openshift-sriov-network-operator
spec:
  networkNamespace: default
  ipam: | 
    {
      "type": "host-local", 
      "subnet": "10.56.217.0/24",
      "rangeStart": "10.56.217.171",
      "rangeEnd": "10.56.217.181",
      "routes": [
        {"dst": "224.0.0.0/5"},
        {"dst": "232.0.0.0/5"}
      ],
      "gateway": "10.56.217.1"
    }
  resourceName: example

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: net-example
  namespace: openshift-sriov-network-operator
spec:
  networkNamespace: default
  ipam: |

1


    {
      "type": "host-local",

2


      "subnet": "10.56.217.0/24",
      "rangeStart": "10.56.217.171",
      "rangeEnd": "10.56.217.181",
      "routes": [
        {"dst": "224.0.0.0/5"},
        {"dst": "232.0.0.0/5"}
      ],
      "gateway": "10.56.217.1"
    }
  resourceName: example

Copy to Clipboard

1 2: If you choose to configure DHCP as IPAM, ensure that you provision the following default routes through your DHCP server: 224.0.0.0/5 and 232.0.0.0/5. This is to override the static multicast route set by the default network provider.

Create a pod with multicast application:

apiVersion: v1
kind: Pod
metadata:
  name: testpmd
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/networks: nic1
spec:
  containers:
  - name: example
    image: rhel7:latest
    securityContext:
      capabilities:
        add: ["NET_ADMIN"] 
    command: [ "sleep", "infinity"]

apiVersion: v1
kind: Pod
metadata:
  name: testpmd
  namespace: default
  annotations:
    k8s.v1.cni.cncf.io/networks: nic1
spec:
  containers:
  - name: example
    image: rhel7:latest
    securityContext:
      capabilities:
        add: ["NET_ADMIN"]

1


    command: [ "sleep", "infinity"]

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1: The NET_ADMIN capability is required only if your application needs to assign the multicast IP address to the SR-IOV interface. Otherwise, it can be omitted.

24.10. Using DPDK and RDMA

The containerized Data Plane Development Kit (DPDK) application is supported on OpenShift Container Platform. You can use Single Root I/O Virtualization (SR-IOV) network hardware with the Data Plane Development Kit (DPDK) and with remote direct memory access (RDMA).

For information on supported devices, refer to Supported devices.

24.10.1. Using a virtual function in DPDK mode with an Intel NIC

Prerequisites

Install the OpenShift CLI (oc).
Install the SR-IOV Network Operator.
Log in as a user with cluster-admin privileges.

Procedure

Create the following SriovNetworkNodePolicy object, and then save the YAML in the intel-dpdk-node-policy.yaml file.

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: intel-dpdk-node-policy
  namespace: openshift-sriov-network-operator
spec:
  resourceName: intelnics
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  priority: <priority>
  numVfs: <num>
  nicSelector:
    vendor: "8086"
    deviceID: "158b"
    pfNames: ["<pf_name>", ...]
    rootDevices: ["<pci_bus_id>", "..."]
  deviceType: vfio-pci

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: intel-dpdk-node-policy
  namespace: openshift-sriov-network-operator
spec:
  resourceName: intelnics
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  priority: <priority>
  numVfs: <num>
  nicSelector:
    vendor: "8086"
    deviceID: "158b"
    pfNames: ["<pf_name>", ...]
    rootDevices: ["<pci_bus_id>", "..."]
  deviceType: vfio-pci

1

Copy to Clipboard

1: Specify the driver type for the virtual functions to vfio-pci.

Note

See the Configuring SR-IOV network devices section for a detailed explanation on each option in SriovNetworkNodePolicy.

When applying the configuration specified in a SriovNetworkNodePolicy object, the SR-IOV Operator may drain the nodes, and in some cases, reboot nodes. It may take several minutes for a configuration change to apply. Ensure that there are enough available nodes in your cluster to handle the evicted workload beforehand.

After the configuration update is applied, all the pods in openshift-sriov-network-operator namespace will change to a Running status.

Create the SriovNetworkNodePolicy object by running the following command:
```
oc create -f intel-dpdk-node-policy.yaml
```
```
$ oc create -f intel-dpdk-node-policy.yaml
```
Copy to Clipboard

Create the following SriovNetwork object, and then save the YAML in the intel-dpdk-network.yaml file.

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: intel-dpdk-network
  namespace: openshift-sriov-network-operator
spec:
  networkNamespace: <target_namespace>
  ipam: |-
# ... 
  vlan: <vlan>
  resourceName: intelnics

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: intel-dpdk-network
  namespace: openshift-sriov-network-operator
spec:
  networkNamespace: <target_namespace>
  ipam: |-
# ...

1


  vlan: <vlan>
  resourceName: intelnics

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1: Specify a configuration object for the ipam CNI plugin as a YAML block scalar. The plugin manages IP address assignment for the attachment definition.

Note

See the "Configuring SR-IOV additional network" section for a detailed explanation on each option in SriovNetwork.

An optional library, app-netutil, provides several API methods for gathering network information about a container’s parent pod.

Create the SriovNetwork object by running the following command:
```
oc create -f intel-dpdk-network.yaml
```
```
$ oc create -f intel-dpdk-network.yaml
```
Copy to Clipboard
Create the following Pod spec, and then save the YAML in the intel-dpdk-pod.yaml file.
```
apiVersion: v1
kind: Pod
metadata:
  name: dpdk-app
  namespace: <target_namespace> 
  annotations:
    k8s.v1.cni.cncf.io/networks: intel-dpdk-network
spec:
  containers:
  - name: testpmd
    image: <DPDK_image> 
    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"] 
    volumeMounts:
    - mountPath: /mnt/huge 
      name: hugepage
    resources:
      limits:
        openshift.io/intelnics: "1" 
        memory: "1Gi"
        cpu: "4" 
        hugepages-1Gi: "4Gi" 
      requests:
        openshift.io/intelnics: "1"
        memory: "1Gi"
        cpu: "4"
        hugepages-1Gi: "4Gi"
    command: ["sleep", "infinity"]
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages
```
```
apiVersion: v1
kind: Pod
metadata:
  name: dpdk-app
  namespace: <target_namespace> 
```
1
```
  annotations:
    k8s.v1.cni.cncf.io/networks: intel-dpdk-network
spec:
  containers:
  - name: testpmd
    image: <DPDK_image> 
```
2
```
    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"] 
```
3
```
    volumeMounts:
    - mountPath: /mnt/huge 
```
4
```
      name: hugepage
    resources:
      limits:
        openshift.io/intelnics: "1" 
```
5
```
        memory: "1Gi"
        cpu: "4" 
```
6
```
        hugepages-1Gi: "4Gi" 
```
7
```
      requests:
        openshift.io/intelnics: "1"
        memory: "1Gi"
        cpu: "4"
        hugepages-1Gi: "4Gi"
    command: ["sleep", "infinity"]
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages
```
Copy to Clipboard
1
Specify the same target_namespace where the SriovNetwork object intel-dpdk-network is created. If you would like to create the pod in a different namespace, change target_namespace in both the Pod spec and the SriovNetwork object.
2
Specify the DPDK image which includes your application and the DPDK library used by application.
3
Specify additional capabilities required by the application inside the container for hugepage allocation, system resource allocation, and network interface access.
4
Mount a hugepage volume to the DPDK pod under /mnt/huge. The hugepage volume is backed by the emptyDir volume type with the medium being Hugepages.
5
Optional: Specify the number of DPDK devices allocated to DPDK pod. This resource request and limit, if not explicitly specified, will be automatically added by the SR-IOV network resource injector. The SR-IOV network resource injector is an admission controller component managed by the SR-IOV Operator. It is enabled by default and can be disabled by setting enableInjector option to false in the default SriovOperatorConfig CR.
6
Specify the number of CPUs. The DPDK pod usually requires exclusive CPUs to be allocated from the kubelet. This is achieved by setting CPU Manager policy to static and creating a pod with Guaranteed QoS.
7
Specify hugepage size hugepages-1Gi or hugepages-2Mi and the quantity of hugepages that will be allocated to the DPDK pod. Configure 2Mi and 1Gi hugepages separately. Configuring 1Gi hugepage requires adding kernel arguments to Nodes. For example, adding kernel arguments default_hugepagesz=1GB, hugepagesz=1G and hugepages=16 will result in 16*1Gi hugepages be allocated during system boot.
Create the DPDK pod by running the following command:
```
oc create -f intel-dpdk-pod.yaml
```
```
$ oc create -f intel-dpdk-pod.yaml
```
Copy to Clipboard

24.10.2. Using a virtual function in DPDK mode with a Mellanox NIC

You can create a network node policy and create a Data Plane Development Kit (DPDK) pod using a virtual function in DPDK mode with a Mellanox NIC.

Prerequisites

You have installed the OpenShift CLI (oc).
You have installed the Single Root I/O Virtualization (SR-IOV) Network Operator.
You have logged in as a user with cluster-admin privileges.

Procedure

Save the following SriovNetworkNodePolicy YAML configuration to an mlx-dpdk-node-policy.yaml file:
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: mlx-dpdk-node-policy
  namespace: openshift-sriov-network-operator
spec:
  resourceName: mlxnics
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  priority: <priority>
  numVfs: <num>
  nicSelector:
    vendor: "15b3"
    deviceID: "1015" 
    pfNames: ["<pf_name>", ...]
    rootDevices: ["<pci_bus_id>", "..."]
  deviceType: netdevice 
  isRdma: true 
```
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: mlx-dpdk-node-policy
  namespace: openshift-sriov-network-operator
spec:
  resourceName: mlxnics
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  priority: <priority>
  numVfs: <num>
  nicSelector:
    vendor: "15b3"
    deviceID: "1015" 
```
1
```
    pfNames: ["<pf_name>", ...]
    rootDevices: ["<pci_bus_id>", "..."]
  deviceType: netdevice 
```
2
```
  isRdma: true 
```
3
Copy to Clipboard
1
Specify the device hex code of the SR-IOV network device.
2
Specify the driver type for the virtual functions to netdevice. A Mellanox SR-IOV Virtual Function (VF) can work in DPDK mode without using the vfio-pci device type. The VF device appears as a kernel network interface inside a container.
3
Enable Remote Direct Memory Access (RDMA) mode. This is required for Mellanox cards to work in DPDK mode.
Note
See Configuring an SR-IOV network device for a detailed explanation of each option in the SriovNetworkNodePolicy object.
When applying the configuration specified in an SriovNetworkNodePolicy object, the SR-IOV Operator might drain the nodes, and in some cases, reboot nodes. It might take several minutes for a configuration change to apply. Ensure that there are enough available nodes in your cluster to handle the evicted workload beforehand.
After the configuration update is applied, all the pods in the openshift-sriov-network-operator namespace will change to a Running status.
Create the SriovNetworkNodePolicy object by running the following command:
```
oc create -f mlx-dpdk-node-policy.yaml
```
```
$ oc create -f mlx-dpdk-node-policy.yaml
```
Copy to Clipboard
Save the following SriovNetwork YAML configuration to an mlx-dpdk-network.yaml file:
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: mlx-dpdk-network
  namespace: openshift-sriov-network-operator
spec:
  networkNamespace: <target_namespace>
  ipam: |- 
...
  vlan: <vlan>
  resourceName: mlxnics
```
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: mlx-dpdk-network
  namespace: openshift-sriov-network-operator
spec:
  networkNamespace: <target_namespace>
  ipam: |- 
```
1
```
...
  vlan: <vlan>
  resourceName: mlxnics
```
Copy to Clipboard
1
Specify a configuration object for the IP Address Management (IPAM) Container Network Interface (CNI) plugin as a YAML block scalar. The plugin manages IP address assignment for the attachment definition.
Note
See Configuring an SR-IOV network device for a detailed explanation on each option in the SriovNetwork object.
The app-netutil option library provides several API methods for gathering network information about the parent pod of a container.
Create the SriovNetwork object by running the following command:
```
oc create -f mlx-dpdk-network.yaml
```
```
$ oc create -f mlx-dpdk-network.yaml
```
Copy to Clipboard

Save the following Pod YAML configuration to an mlx-dpdk-pod.yaml file:

apiVersion: v1
kind: Pod
metadata:
  name: dpdk-app
  namespace: <target_namespace> 
  annotations:
    k8s.v1.cni.cncf.io/networks: mlx-dpdk-network
spec:
  containers:
  - name: testpmd
    image: <DPDK_image> 
    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"] 
    volumeMounts:
    - mountPath: /mnt/huge 
      name: hugepage
    resources:
      limits:
        openshift.io/mlxnics: "1" 
        memory: "1Gi"
        cpu: "4" 
        hugepages-1Gi: "4Gi" 
      requests:
        openshift.io/mlxnics: "1"
        memory: "1Gi"
        cpu: "4"
        hugepages-1Gi: "4Gi"
    command: ["sleep", "infinity"]
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

apiVersion: v1
kind: Pod
metadata:
  name: dpdk-app
  namespace: <target_namespace>

1


  annotations:
    k8s.v1.cni.cncf.io/networks: mlx-dpdk-network
spec:
  containers:
  - name: testpmd
    image: <DPDK_image>

2


    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"]

3


    volumeMounts:
    - mountPath: /mnt/huge

4


      name: hugepage
    resources:
      limits:
        openshift.io/mlxnics: "1"

5


        memory: "1Gi"
        cpu: "4"

6


        hugepages-1Gi: "4Gi"

7


      requests:
        openshift.io/mlxnics: "1"
        memory: "1Gi"
        cpu: "4"
        hugepages-1Gi: "4Gi"
    command: ["sleep", "infinity"]
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

Copy to Clipboard

1: Specify the same target_namespace where SriovNetwork object mlx-dpdk-network is created. To create the pod in a different namespace, change target_namespace in both the Pod spec and SriovNetwork object.
2: Specify the DPDK image which includes your application and the DPDK library used by the application.
3: Specify additional capabilities required by the application inside the container for hugepage allocation, system resource allocation, and network interface access.
4: Mount the hugepage volume to the DPDK pod under /mnt/huge. The hugepage volume is backed by the emptyDir volume type with the medium being Hugepages.
5: Optional: Specify the number of DPDK devices allocated for the DPDK pod. If not explicitly specified, this resource request and limit is automatically added by the SR-IOV network resource injector. The SR-IOV network resource injector is an admission controller component managed by SR-IOV Operator. It is enabled by default and can be disabled by setting the enableInjector option to false in the default SriovOperatorConfig CR.
6: Specify the number of CPUs. The DPDK pod usually requires that exclusive CPUs be allocated from the kubelet. To do this, set the CPU Manager policy to static and create a pod with Guaranteed Quality of Service (QoS).
7: Specify hugepage size hugepages-1Gi or hugepages-2Mi and the quantity of hugepages that will be allocated to the DPDK pod. Configure 2Mi and 1Gi hugepages separately. Configuring 1Gi hugepages requires adding kernel arguments to Nodes.

Create the DPDK pod by running the following command:
```
oc create -f mlx-dpdk-pod.yaml
```
```
$ oc create -f mlx-dpdk-pod.yaml
```
Copy to Clipboard

24.10.3. Overview of achieving a specific DPDK line rate

To achieve a specific Data Plane Development Kit (DPDK) line rate, deploy a Node Tuning Operator and configure Single Root I/O Virtualization (SR-IOV). You must also tune the DPDK settings for the following resources:

Isolated CPUs
Hugepages
The topology scheduler

Note

In previous versions of OpenShift Container Platform, the Performance Addon Operator was used to implement automatic tuning to achieve low latency performance for OpenShift Container Platform applications. In OpenShift Container Platform 4.11 and later, this functionality is part of the Node Tuning Operator.

DPDK test environment

The following diagram shows the components of a traffic-testing environment:

Traffic generator: An application that can generate high-volume packet traffic.
SR-IOV-supporting NIC: A network interface card compatible with SR-IOV. The card runs a number of virtual functions on a physical interface.
Physical Function (PF): A PCI Express (PCIe) function of a network adapter that supports the SR-IOV interface.
Virtual Function (VF): A lightweight PCIe function on a network adapter that supports SR-IOV. The VF is associated with the PCIe PF on the network adapter. The VF represents a virtualized instance of the network adapter.
Switch: A network switch. Nodes can also be connected back-to-back.
testpmd: An example application included with DPDK. The testpmd application can be used to test the DPDK in a packet-forwarding mode. The testpmd application is also an example of how to build a fully-fledged application using the DPDK Software Development Kit (SDK).
worker 0 and worker 1: OpenShift Container Platform nodes.

24.10.4. Using SR-IOV and the Node Tuning Operator to achieve a DPDK line rate

You can use the Node Tuning Operator to configure isolated CPUs, hugepages, and a topology scheduler. You can then use the Node Tuning Operator with Single Root I/O Virtualization (SR-IOV) to achieve a specific Data Plane Development Kit (DPDK) line rate.

Prerequisites

You have installed the OpenShift CLI (oc).
You have installed the SR-IOV Network Operator.
You have logged in as a user with cluster-admin privileges.
You have deployed a standalone Node Tuning Operator.
Note
In previous versions of OpenShift Container Platform, the Performance Addon Operator was used to implement automatic tuning to achieve low latency performance for OpenShift applications. In OpenShift Container Platform 4.11 and later, this functionality is part of the Node Tuning Operator.

Procedure

Create a PerformanceProfile object based on the following example:
```
apiVersion: performance.openshift.io/v2
kind: PerformanceProfile
metadata:
  name: performance
spec:
  globallyDisableIrqLoadBalancing: true
  cpu:
    isolated: 21-51,73-103 
    reserved: 0-20,52-72 
  hugepages:
    defaultHugepagesSize: 1G 
    pages:
      - count: 32
        size: 1G
  net:
    userLevelNetworking: true
  numa:
    topologyPolicy: "single-numa-node"
  nodeSelector:
    node-role.kubernetes.io/worker-cnf: ""
```
```
apiVersion: performance.openshift.io/v2
kind: PerformanceProfile
metadata:
  name: performance
spec:
  globallyDisableIrqLoadBalancing: true
  cpu:
    isolated: 21-51,73-103 
```
1
```
    reserved: 0-20,52-72 
```
2
```
  hugepages:
    defaultHugepagesSize: 1G 
```
3
```
    pages:
      - count: 32
        size: 1G
  net:
    userLevelNetworking: true
  numa:
    topologyPolicy: "single-numa-node"
  nodeSelector:
    node-role.kubernetes.io/worker-cnf: ""
```
Copy to Clipboard
1
If hyperthreading is enabled on the system, allocate the relevant symbolic links to the isolated and reserved CPU groups. If the system contains multiple non-uniform memory access nodes (NUMAs), allocate CPUs from both NUMAs to both groups. You can also use the Performance Profile Creator for this task. For more information, see Creating a performance profile.
2
You can also specify a list of devices that will have their queues set to the reserved CPU count. For more information, see Reducing NIC queues using the Node Tuning Operator.
3
Allocate the number and size of hugepages needed. You can specify the NUMA configuration for the hugepages. By default, the system allocates an even number to every NUMA node on the system. If needed, you can request the use of a realtime kernel for the nodes. See Provisioning a worker with real-time capabilities for more information.
Save the yaml file as mlx-dpdk-perfprofile-policy.yaml.

Apply the performance profile using the following command:

oc create -f mlx-dpdk-perfprofile-policy.yaml

$ oc create -f mlx-dpdk-perfprofile-policy.yaml

Copy to Clipboard

24.10.4.1. Example SR-IOV Network Operator for virtual functions

You can use the Single Root I/O Virtualization (SR-IOV) Network Operator to allocate and configure Virtual Functions (VFs) from SR-IOV-supporting Physical Function NICs on the nodes.

For more information on deploying the Operator, see Installing the SR-IOV Network Operator. For more information on configuring an SR-IOV network device, see Configuring an SR-IOV network device.

There are some differences between running Data Plane Development Kit (DPDK) workloads on Intel VFs and Mellanox VFs. This section provides object configuration examples for both VF types. The following is an example of an sriovNetworkNodePolicy object used to run DPDK applications on Intel NICs:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: dpdk-nic-1
  namespace: openshift-sriov-network-operator
spec:
  deviceType: vfio-pci 
  needVhostNet: true 
  nicSelector:
    pfNames: ["ens3f0"]
  nodeSelector:
    node-role.kubernetes.io/worker-cnf: ""
  numVfs: 10
  priority: 99
  resourceName: dpdk_nic_1
---
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: dpdk-nic-1
  namespace: openshift-sriov-network-operator
spec:
  deviceType: vfio-pci
  needVhostNet: true
  nicSelector:
    pfNames: ["ens3f1"]
  nodeSelector:
  node-role.kubernetes.io/worker-cnf: ""
  numVfs: 10
  priority: 99
  resourceName: dpdk_nic_2

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: dpdk-nic-1
  namespace: openshift-sriov-network-operator
spec:
  deviceType: vfio-pci

1


  needVhostNet: true

2


  nicSelector:
    pfNames: ["ens3f0"]
  nodeSelector:
    node-role.kubernetes.io/worker-cnf: ""
  numVfs: 10
  priority: 99
  resourceName: dpdk_nic_1
---
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: dpdk-nic-1
  namespace: openshift-sriov-network-operator
spec:
  deviceType: vfio-pci
  needVhostNet: true
  nicSelector:
    pfNames: ["ens3f1"]
  nodeSelector:
  node-role.kubernetes.io/worker-cnf: ""
  numVfs: 10
  priority: 99
  resourceName: dpdk_nic_2

Copy to Clipboard

1: For Intel NICs, deviceType must be vfio-pci.
2: If kernel communication with DPDK workloads is required, add needVhostNet: true. This mounts the /dev/net/tun and /dev/vhost-net devices into the container so the application can create a tap device and connect the tap device to the DPDK workload.

The following is an example of an sriovNetworkNodePolicy object for Mellanox NICs:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: dpdk-nic-1
  namespace: openshift-sriov-network-operator
spec:
  deviceType: netdevice 
  isRdma: true 
  nicSelector:
    rootDevices:
      - "0000:5e:00.1"
  nodeSelector:
    node-role.kubernetes.io/worker-cnf: ""
  numVfs: 5
  priority: 99
  resourceName: dpdk_nic_1
---
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: dpdk-nic-2
  namespace: openshift-sriov-network-operator
spec:
  deviceType: netdevice
  isRdma: true
  nicSelector:
    rootDevices:
      - "0000:5e:00.0"
  nodeSelector:
    node-role.kubernetes.io/worker-cnf: ""
  numVfs: 5
  priority: 99
  resourceName: dpdk_nic_2

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: dpdk-nic-1
  namespace: openshift-sriov-network-operator
spec:
  deviceType: netdevice

1


  isRdma: true

2


  nicSelector:
    rootDevices:
      - "0000:5e:00.1"
  nodeSelector:
    node-role.kubernetes.io/worker-cnf: ""
  numVfs: 5
  priority: 99
  resourceName: dpdk_nic_1
---
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: dpdk-nic-2
  namespace: openshift-sriov-network-operator
spec:
  deviceType: netdevice
  isRdma: true
  nicSelector:
    rootDevices:
      - "0000:5e:00.0"
  nodeSelector:
    node-role.kubernetes.io/worker-cnf: ""
  numVfs: 5
  priority: 99
  resourceName: dpdk_nic_2

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1: For Mellanox devices the deviceType must be netdevice.
2: For Mellanox devices isRdma must be true. Mellanox cards are connected to DPDK applications using Flow Bifurcation. This mechanism splits traffic between Linux user space and kernel space, and can enhance line rate processing capability.

24.10.4.2. Example SR-IOV network operator

The following is an example definition of an sriovNetwork object. In this case, Intel and Mellanox configurations are identical:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: dpdk-network-1
  namespace: openshift-sriov-network-operator
spec:
  ipam: '{"type": "host-local","ranges": [[{"subnet": "10.0.1.0/24"}]],"dataDir":
   "/run/my-orchestrator/container-ipam-state-1"}' 
  networkNamespace: dpdk-test 
  spoofChk: "off"
  trust: "on"
  resourceName: dpdk_nic_1 
---
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: dpdk-network-2
  namespace: openshift-sriov-network-operator
spec:
  ipam: '{"type": "host-local","ranges": [[{"subnet": "10.0.2.0/24"}]],"dataDir":
   "/run/my-orchestrator/container-ipam-state-1"}'
  networkNamespace: dpdk-test
  spoofChk: "off"
  trust: "on"
  resourceName: dpdk_nic_2

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: dpdk-network-1
  namespace: openshift-sriov-network-operator
spec:
  ipam: '{"type": "host-local","ranges": [[{"subnet": "10.0.1.0/24"}]],"dataDir":
   "/run/my-orchestrator/container-ipam-state-1"}'

1


  networkNamespace: dpdk-test

2


  spoofChk: "off"
  trust: "on"
  resourceName: dpdk_nic_1

3


---
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: dpdk-network-2
  namespace: openshift-sriov-network-operator
spec:
  ipam: '{"type": "host-local","ranges": [[{"subnet": "10.0.2.0/24"}]],"dataDir":
   "/run/my-orchestrator/container-ipam-state-1"}'
  networkNamespace: dpdk-test
  spoofChk: "off"
  trust: "on"
  resourceName: dpdk_nic_2

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1: You can use a different IP Address Management (IPAM) implementation, such as Whereabouts. For more information, see Dynamic IP address assignment configuration with Whereabouts.
2: You must request the networkNamespace where the network attachment definition will be created. You must create the sriovNetwork CR under the openshift-sriov-network-operator namespace.
3: The resourceName value must match that of the resourceName created under the sriovNetworkNodePolicy.

24.10.4.3. Example DPDK base workload

The following is an example of a Data Plane Development Kit (DPDK) container:

apiVersion: v1
kind: Namespace
metadata:
  name: dpdk-test
---
apiVersion: v1
kind: Pod
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: '[ 
     {
      "name": "dpdk-network-1",
      "namespace": "dpdk-test"
     },
     {
      "name": "dpdk-network-2",
      "namespace": "dpdk-test"
     }
   ]'
    irq-load-balancing.crio.io: "disable" 
    cpu-load-balancing.crio.io: "disable"
    cpu-quota.crio.io: "disable"
  labels:
    app: dpdk
  name: testpmd
  namespace: dpdk-test
spec:
  runtimeClassName: performance-performance 
  containers:
    - command:
        - /bin/bash
        - -c
        - sleep INF
      image: registry.redhat.io/openshift4/dpdk-base-rhel8
      imagePullPolicy: Always
      name: dpdk
      resources: 
        limits:
          cpu: "16"
          hugepages-1Gi: 8Gi
          memory: 2Gi
        requests:
          cpu: "16"
          hugepages-1Gi: 8Gi
          memory: 2Gi
      securityContext:
        capabilities:
          add:
            - IPC_LOCK
            - SYS_RESOURCE
            - NET_RAW
            - NET_ADMIN
        runAsUser: 0
      volumeMounts:
        - mountPath: /mnt/huge
          name: hugepages
  terminationGracePeriodSeconds: 5
  volumes:
    - emptyDir:
        medium: HugePages
      name: hugepages

apiVersion: v1
kind: Namespace
metadata:
  name: dpdk-test
---
apiVersion: v1
kind: Pod
metadata:
  annotations:
    k8s.v1.cni.cncf.io/networks: '[

1


     {
      "name": "dpdk-network-1",
      "namespace": "dpdk-test"
     },
     {
      "name": "dpdk-network-2",
      "namespace": "dpdk-test"
     }
   ]'
    irq-load-balancing.crio.io: "disable"

2


    cpu-load-balancing.crio.io: "disable"
    cpu-quota.crio.io: "disable"
  labels:
    app: dpdk
  name: testpmd
  namespace: dpdk-test
spec:
  runtimeClassName: performance-performance

3


  containers:
    - command:
        - /bin/bash
        - -c
        - sleep INF
      image: registry.redhat.io/openshift4/dpdk-base-rhel8
      imagePullPolicy: Always
      name: dpdk
      resources:

4


        limits:
          cpu: "16"
          hugepages-1Gi: 8Gi
          memory: 2Gi
        requests:
          cpu: "16"
          hugepages-1Gi: 8Gi
          memory: 2Gi
      securityContext:
        capabilities:
          add:
            - IPC_LOCK
            - SYS_RESOURCE
            - NET_RAW
            - NET_ADMIN
        runAsUser: 0
      volumeMounts:
        - mountPath: /mnt/huge
          name: hugepages
  terminationGracePeriodSeconds: 5
  volumes:
    - emptyDir:
        medium: HugePages
      name: hugepages

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1: Request the SR-IOV networks you need. Resources for the devices will be injected automatically.
2: Disable the CPU and IRQ load balancing base. See Disabling interrupt processing for individual pods for more information.
3: Set the runtimeClass to performance-performance. Do not set the runtimeClass to HostNetwork or privileged.
4: Request an equal number of resources for requests and limits to start the pod with Guaranteed Quality of Service (QoS).

Note

Do not start the pod with SLEEP and then exec into the pod to start the testpmd or the DPDK workload. This can add additional interrupts as the exec process is not pinned to any CPU.

24.10.4.4. Example testpmd script

The following is an example script for running testpmd:

#!/bin/bash
set -ex
export CPU=$(cat /sys/fs/cgroup/cpuset/cpuset.cpus)
echo ${CPU}

dpdk-testpmd -l ${CPU} -a ${PCIDEVICE_OPENSHIFT_IO_DPDK_NIC_1} -a ${PCIDEVICE_OPENSHIFT_IO_DPDK_NIC_2} -n 4 -- -i --nb-cores=15 --rxd=4096 --txd=4096 --rxq=7 --txq=7 --forward-mode=mac --eth-peer=0,50:00:00:00:00:01 --eth-peer=1,50:00:00:00:00:02

#!/bin/bash
set -ex
export CPU=$(cat /sys/fs/cgroup/cpuset/cpuset.cpus)
echo ${CPU}

dpdk-testpmd -l ${CPU} -a ${PCIDEVICE_OPENSHIFT_IO_DPDK_NIC_1} -a ${PCIDEVICE_OPENSHIFT_IO_DPDK_NIC_2} -n 4 -- -i --nb-cores=15 --rxd=4096 --txd=4096 --rxq=7 --txq=7 --forward-mode=mac --eth-peer=0,50:00:00:00:00:01 --eth-peer=1,50:00:00:00:00:02

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This example uses two different sriovNetwork CRs. The environment variable contains the Virtual Function (VF) PCI address that was allocated for the pod. If you use the same network in the pod definition, you must split the pciAddress. It is important to configure the correct MAC addresses of the traffic generator. This example uses custom MAC addresses.

24.10.5. Using a virtual function in RDMA mode with a Mellanox NIC

Important

RDMA over Converged Ethernet (RoCE) is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

RDMA over Converged Ethernet (RoCE) is the only supported mode when using RDMA on OpenShift Container Platform.

Prerequisites

Install the OpenShift CLI (oc).
Install the SR-IOV Network Operator.
Log in as a user with cluster-admin privileges.

Procedure

Create the following SriovNetworkNodePolicy object, and then save the YAML in the mlx-rdma-node-policy.yaml file.

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: mlx-rdma-node-policy
  namespace: openshift-sriov-network-operator
spec:
  resourceName: mlxnics
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  priority: <priority>
  numVfs: <num>
  nicSelector:
    vendor: "15b3"
    deviceID: "1015" 
    pfNames: ["<pf_name>", ...]
    rootDevices: ["<pci_bus_id>", "..."]
  deviceType: netdevice 
  isRdma: true

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: mlx-rdma-node-policy
  namespace: openshift-sriov-network-operator
spec:
  resourceName: mlxnics
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  priority: <priority>
  numVfs: <num>
  nicSelector:
    vendor: "15b3"
    deviceID: "1015"

1


    pfNames: ["<pf_name>", ...]
    rootDevices: ["<pci_bus_id>", "..."]
  deviceType: netdevice

2


  isRdma: true

3

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1: Specify the device hex code of the SR-IOV network device.
2: Specify the driver type for the virtual functions to netdevice.
3: Enable RDMA mode.

Note

See the Configuring SR-IOV network devices section for a detailed explanation on each option in SriovNetworkNodePolicy.

When applying the configuration specified in a SriovNetworkNodePolicy object, the SR-IOV Operator may drain the nodes, and in some cases, reboot nodes. It may take several minutes for a configuration change to apply. Ensure that there are enough available nodes in your cluster to handle the evicted workload beforehand.

After the configuration update is applied, all the pods in the openshift-sriov-network-operator namespace will change to a Running status.

Create the SriovNetworkNodePolicy object by running the following command:
```
oc create -f mlx-rdma-node-policy.yaml
```
```
$ oc create -f mlx-rdma-node-policy.yaml
```
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Create the following SriovNetwork object, and then save the YAML in the mlx-rdma-network.yaml file.
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: mlx-rdma-network
  namespace: openshift-sriov-network-operator
spec:
  networkNamespace: <target_namespace>
  ipam: |- 
# ...
  vlan: <vlan>
  resourceName: mlxnics
```
```
apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetwork
metadata:
  name: mlx-rdma-network
  namespace: openshift-sriov-network-operator
spec:
  networkNamespace: <target_namespace>
  ipam: |- 
```
1
```
# ...
  vlan: <vlan>
  resourceName: mlxnics
```
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1
Specify a configuration object for the ipam CNI plugin as a YAML block scalar. The plugin manages IP address assignment for the attachment definition.
Note
See the "Configuring SR-IOV additional network" section for a detailed explanation on each option in SriovNetwork.
An optional library, app-netutil, provides several API methods for gathering network information about a container’s parent pod.
Create the SriovNetworkNodePolicy object by running the following command:
```
oc create -f mlx-rdma-network.yaml
```
```
$ oc create -f mlx-rdma-network.yaml
```
Copy to Clipboard

Create the following Pod spec, and then save the YAML in the mlx-rdma-pod.yaml file.

apiVersion: v1
kind: Pod
metadata:
  name: rdma-app
  namespace: <target_namespace> 
  annotations:
    k8s.v1.cni.cncf.io/networks: mlx-rdma-network
spec:
  containers:
  - name: testpmd
    image: <RDMA_image> 
    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"] 
    volumeMounts:
    - mountPath: /mnt/huge 
      name: hugepage
    resources:
      limits:
        memory: "1Gi"
        cpu: "4" 
        hugepages-1Gi: "4Gi" 
      requests:
        memory: "1Gi"
        cpu: "4"
        hugepages-1Gi: "4Gi"
    command: ["sleep", "infinity"]
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

apiVersion: v1
kind: Pod
metadata:
  name: rdma-app
  namespace: <target_namespace>

1


  annotations:
    k8s.v1.cni.cncf.io/networks: mlx-rdma-network
spec:
  containers:
  - name: testpmd
    image: <RDMA_image>

2


    securityContext:
      runAsUser: 0
      capabilities:
        add: ["IPC_LOCK","SYS_RESOURCE","NET_RAW"]

3


    volumeMounts:
    - mountPath: /mnt/huge

4


      name: hugepage
    resources:
      limits:
        memory: "1Gi"
        cpu: "4"

5


        hugepages-1Gi: "4Gi"

6


      requests:
        memory: "1Gi"
        cpu: "4"
        hugepages-1Gi: "4Gi"
    command: ["sleep", "infinity"]
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

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1: Specify the same target_namespace where SriovNetwork object mlx-rdma-network is created. If you would like to create the pod in a different namespace, change target_namespace in both Pod spec and SriovNetwork object.
2: Specify the RDMA image which includes your application and RDMA library used by application.
3: Specify additional capabilities required by the application inside the container for hugepage allocation, system resource allocation, and network interface access.
4: Mount the hugepage volume to RDMA pod under /mnt/huge. The hugepage volume is backed by the emptyDir volume type with the medium being Hugepages.
5: Specify number of CPUs. The RDMA pod usually requires exclusive CPUs be allocated from the kubelet. This is achieved by setting CPU Manager policy to static and create pod with Guaranteed QoS.
6: Specify hugepage size hugepages-1Gi or hugepages-2Mi and the quantity of hugepages that will be allocated to the RDMA pod. Configure 2Mi and 1Gi hugepages separately. Configuring 1Gi hugepage requires adding kernel arguments to Nodes.

Create the RDMA pod by running the following command:
```
oc create -f mlx-rdma-pod.yaml
```
```
$ oc create -f mlx-rdma-pod.yaml
```
Copy to Clipboard

24.10.6. A test pod template for clusters that use OVS-DPDK on OpenStack

The following testpmd pod demonstrates container creation with huge pages, reserved CPUs, and the SR-IOV port.

An example testpmd pod

apiVersion: v1
kind: Pod
metadata:
  name: testpmd-dpdk
  namespace: mynamespace
  annotations:
    cpu-load-balancing.crio.io: "disable"
    cpu-quota.crio.io: "disable"
# ...
spec:
  containers:
  - name: testpmd
    command: ["sleep", "99999"]
    image: registry.redhat.io/openshift4/dpdk-base-rhel8:v4.9
    securityContext:
      capabilities:
        add: ["IPC_LOCK","SYS_ADMIN"]
      privileged: true
      runAsUser: 0
    resources:
      requests:
        memory: 1000Mi
        hugepages-1Gi: 1Gi
        cpu: '2'
        openshift.io/dpdk1: 1 
      limits:
        hugepages-1Gi: 1Gi
        cpu: '2'
        memory: 1000Mi
        openshift.io/dpdk1: 1
    volumeMounts:
      - mountPath: /mnt/huge
        name: hugepage
        readOnly: False
  runtimeClassName: performance-cnf-performanceprofile 
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

apiVersion: v1
kind: Pod
metadata:
  name: testpmd-dpdk
  namespace: mynamespace
  annotations:
    cpu-load-balancing.crio.io: "disable"
    cpu-quota.crio.io: "disable"
# ...
spec:
  containers:
  - name: testpmd
    command: ["sleep", "99999"]
    image: registry.redhat.io/openshift4/dpdk-base-rhel8:v4.9
    securityContext:
      capabilities:
        add: ["IPC_LOCK","SYS_ADMIN"]
      privileged: true
      runAsUser: 0
    resources:
      requests:
        memory: 1000Mi
        hugepages-1Gi: 1Gi
        cpu: '2'
        openshift.io/dpdk1: 1

1


      limits:
        hugepages-1Gi: 1Gi
        cpu: '2'
        memory: 1000Mi
        openshift.io/dpdk1: 1
    volumeMounts:
      - mountPath: /mnt/huge
        name: hugepage
        readOnly: False
  runtimeClassName: performance-cnf-performanceprofile

2


  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

Copy to Clipboard

1: The name dpdk1 in this example is a user-created SriovNetworkNodePolicy resource. You can substitute this name for that of a resource that you create.
2: If your performance profile is not named cnf-performance profile, replace that string with the correct performance profile name.

24.10.7. A test pod template for clusters that use OVS hardware offloading on OpenStack

The following testpmd pod demonstrates Open vSwitch (OVS) hardware offloading on Red Hat OpenStack Platform (RHOSP).

An example testpmd pod

apiVersion: v1
kind: Pod
metadata:
  name: testpmd-sriov
  namespace: mynamespace
  annotations:
    k8s.v1.cni.cncf.io/networks: hwoffload1
spec:
  runtimeClassName: performance-cnf-performanceprofile 
  containers:
  - name: testpmd
    command: ["sleep", "99999"]
    image: registry.redhat.io/openshift4/dpdk-base-rhel8:v4.9
    securityContext:
      capabilities:
        add: ["IPC_LOCK","SYS_ADMIN"]
      privileged: true
      runAsUser: 0
    resources:
      requests:
        memory: 1000Mi
        hugepages-1Gi: 1Gi
        cpu: '2'
      limits:
        hugepages-1Gi: 1Gi
        cpu: '2'
        memory: 1000Mi
    volumeMounts:
      - mountPath: /mnt/huge
        name: hugepage
        readOnly: False
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

apiVersion: v1
kind: Pod
metadata:
  name: testpmd-sriov
  namespace: mynamespace
  annotations:
    k8s.v1.cni.cncf.io/networks: hwoffload1
spec:
  runtimeClassName: performance-cnf-performanceprofile

1


  containers:
  - name: testpmd
    command: ["sleep", "99999"]
    image: registry.redhat.io/openshift4/dpdk-base-rhel8:v4.9
    securityContext:
      capabilities:
        add: ["IPC_LOCK","SYS_ADMIN"]
      privileged: true
      runAsUser: 0
    resources:
      requests:
        memory: 1000Mi
        hugepages-1Gi: 1Gi
        cpu: '2'
      limits:
        hugepages-1Gi: 1Gi
        cpu: '2'
        memory: 1000Mi
    volumeMounts:
      - mountPath: /mnt/huge
        name: hugepage
        readOnly: False
  volumes:
  - name: hugepage
    emptyDir:
      medium: HugePages

Copy to Clipboard

1: If your performance profile is not named cnf-performance profile, replace that string with the correct performance profile name.

24.11. Using pod-level bonding

Bonding at the pod level is vital to enable workloads inside pods that require high availability and more throughput. With pod-level bonding, you can create a bond interface from multiple single root I/O virtualization (SR-IOV) virtual function interfaces in a kernel mode interface. The SR-IOV virtual functions are passed into the pod and attached to a kernel driver.

One scenario where pod level bonding is required is creating a bond interface from multiple SR-IOV virtual functions on different physical functions. Creating a bond interface from two different physical functions on the host can be used to achieve high availability and throughput at pod level.

For guidance on tasks such as creating a SR-IOV network, network policies, network attachment definitions and pods, see Configuring an SR-IOV network device.

24.11.1. Configuring a bond interface from two SR-IOV interfaces

Bonding enables multiple network interfaces to be aggregated into a single logical "bonded" interface. Bond Container Network Interface (Bond-CNI) brings bond capability into containers.

Bond-CNI can be created using Single Root I/O Virtualization (SR-IOV) virtual functions and placing them in the container network namespace.

OpenShift Container Platform only supports Bond-CNI using SR-IOV virtual functions. The SR-IOV Network Operator provides the SR-IOV CNI plugin needed to manage the virtual functions. Other CNIs or types of interfaces are not supported.

Prerequisites

The SR-IOV Network Operator must be installed and configured to obtain virtual functions in a container.
To configure SR-IOV interfaces, an SR-IOV network and policy must be created for each interface.
The SR-IOV Network Operator creates a network attachment definition for each SR-IOV interface, based on the SR-IOV network and policy defined.
The linkState is set to the default value auto for the SR-IOV virtual function.

24.11.1.1. Creating a bond network attachment definition

Now that the SR-IOV virtual functions are available, you can create a bond network attachment definition.

apiVersion: "k8s.cni.cncf.io/v1"
    kind: NetworkAttachmentDefinition
    metadata:
      name: bond-net1
      namespace: demo
    spec:
      config: '{
      "type": "bond", 
      "cniVersion": "0.3.1",
      "name": "bond-net1",
      "mode": "active-backup", 
      "failOverMac": 1, 
      "linksInContainer": true, 
      "miimon": "100",
      "mtu": 1500,
      "links": [ 
            {"name": "net1"},
            {"name": "net2"}
        ],
      "ipam": {
            "type": "host-local",
            "subnet": "10.56.217.0/24",
            "routes": [{
            "dst": "0.0.0.0/0"
            }],
            "gateway": "10.56.217.1"
        }
      }'

apiVersion: "k8s.cni.cncf.io/v1"
    kind: NetworkAttachmentDefinition
    metadata:
      name: bond-net1
      namespace: demo
    spec:
      config: '{
      "type": "bond",

1


      "cniVersion": "0.3.1",
      "name": "bond-net1",
      "mode": "active-backup",

2


      "failOverMac": 1,

3


      "linksInContainer": true,

4


      "miimon": "100",
      "mtu": 1500,
      "links": [

5


            {"name": "net1"},
            {"name": "net2"}
        ],
      "ipam": {
            "type": "host-local",
            "subnet": "10.56.217.0/24",
            "routes": [{
            "dst": "0.0.0.0/0"
            }],
            "gateway": "10.56.217.1"
        }
      }'

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The cni-type is always set to bond.

The mode attribute specifies the bonding mode.

Note

The bonding modes supported are:

balance-rr - 0
active-backup - 1
balance-xor - 2

For balance-rr or balance-xor modes, you must set the trust mode to on for the SR-IOV virtual function.

The failover attribute is mandatory for active-backup mode and must be set to 1.

4

The linksInContainer=true flag informs the Bond CNI that the required interfaces are to be found inside the container. By default, Bond CNI looks for these interfaces on the host which does not work for integration with SRIOV and Multus.

5

The links section defines which interfaces will be used to create the bond. By default, Multus names the attached interfaces as: "net", plus a consecutive number, starting with one.

24.11.1.2. Creating a pod using a bond interface

Test the setup by creating a pod with a YAML file named for example podbonding.yaml with content similar to the following:

apiVersion: v1
    kind: Pod
    metadata:
      name: bondpod1
      namespace: demo
      annotations:
        k8s.v1.cni.cncf.io/networks: demo/sriovnet1, demo/sriovnet2, demo/bond-net1 
    spec:
      containers:
      - name: podexample
        image: quay.io/openshift/origin-network-interface-bond-cni:4.11.0
        command: ["/bin/bash", "-c", "sleep INF"]

apiVersion: v1
    kind: Pod
    metadata:
      name: bondpod1
      namespace: demo
      annotations:
        k8s.v1.cni.cncf.io/networks: demo/sriovnet1, demo/sriovnet2, demo/bond-net1

1


    spec:
      containers:
      - name: podexample
        image: quay.io/openshift/origin-network-interface-bond-cni:4.11.0
        command: ["/bin/bash", "-c", "sleep INF"]

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1: Note the network annotation: it contains two SR-IOV network attachments, and one bond network attachment. The bond attachment uses the two SR-IOV interfaces as bonded port interfaces.

Apply the yaml by running the following command:
```
oc apply -f podbonding.yaml
```
```
$ oc apply -f podbonding.yaml
```
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Inspect the pod interfaces with the following command:

$ oc rsh -n demo bondpod1
sh-4.4#
sh-4.4# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
3: eth0@if150: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1450 qdisc noqueue state UP
link/ether 62:b1:b5:c8:fb:7a brd ff:ff:ff:ff:ff:ff
inet 10.244.1.122/24 brd 10.244.1.255 scope global eth0
valid_lft forever preferred_lft forever
4: net3: <BROADCAST,MULTICAST,UP,LOWER_UP400> mtu 1500 qdisc noqueue state UP qlen 1000
link/ether 9e:23:69:42:fb:8a brd ff:ff:ff:ff:ff:ff 
inet 10.56.217.66/24 scope global bond0
valid_lft forever preferred_lft forever
43: net1: <BROADCAST,MULTICAST,UP,LOWER_UP800> mtu 1500 qdisc mq master bond0 state UP qlen 1000
link/ether 9e:23:69:42:fb:8a brd ff:ff:ff:ff:ff:ff 
44: net2: <BROADCAST,MULTICAST,UP,LOWER_UP800> mtu 1500 qdisc mq master bond0 state UP qlen 1000
link/ether 9e:23:69:42:fb:8a brd ff:ff:ff:ff:ff:ff

$ oc rsh -n demo bondpod1
sh-4.4#
sh-4.4# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
3: eth0@if150: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1450 qdisc noqueue state UP
link/ether 62:b1:b5:c8:fb:7a brd ff:ff:ff:ff:ff:ff
inet 10.244.1.122/24 brd 10.244.1.255 scope global eth0
valid_lft forever preferred_lft forever
4: net3: <BROADCAST,MULTICAST,UP,LOWER_UP400> mtu 1500 qdisc noqueue state UP qlen 1000
link/ether 9e:23:69:42:fb:8a brd ff:ff:ff:ff:ff:ff

1


inet 10.56.217.66/24 scope global bond0
valid_lft forever preferred_lft forever
43: net1: <BROADCAST,MULTICAST,UP,LOWER_UP800> mtu 1500 qdisc mq master bond0 state UP qlen 1000
link/ether 9e:23:69:42:fb:8a brd ff:ff:ff:ff:ff:ff

2


44: net2: <BROADCAST,MULTICAST,UP,LOWER_UP800> mtu 1500 qdisc mq master bond0 state UP qlen 1000
link/ether 9e:23:69:42:fb:8a brd ff:ff:ff:ff:ff:ff

3

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1: The bond interface is automatically named net3. To set a specific interface name add @name suffix to the pod’s k8s.v1.cni.cncf.io/networks annotation.
2: The net1 interface is based on an SR-IOV virtual function.
3: The net2 interface is based on an SR-IOV virtual function.

Note

If no interface names are configured in the pod annotation, interface names are assigned automatically as net<n>, with <n> starting at 1.

Optional: If you want to set a specific interface name for example bond0, edit the k8s.v1.cni.cncf.io/networks annotation and set bond0 as the interface name as follows:

annotations:
        k8s.v1.cni.cncf.io/networks: demo/sriovnet1, demo/sriovnet2, demo/bond-net1@bond0

annotations:
        k8s.v1.cni.cncf.io/networks: demo/sriovnet1, demo/sriovnet2, demo/bond-net1@bond0

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24.12. Configuring hardware offloading

As a cluster administrator, you can configure hardware offloading on compatible nodes to increase data processing performance and reduce load on host CPUs.

24.12.1. About hardware offloading

Open vSwitch hardware offloading is a method of processing network tasks by diverting them away from the CPU and offloading them to a dedicated processor on a network interface controller. As a result, clusters can benefit from faster data transfer speeds, reduced CPU workloads, and lower computing costs.

The key element for this feature is a modern class of network interface controllers known as SmartNICs. A SmartNIC is a network interface controller that is able to handle computationally-heavy network processing tasks. In the same way that a dedicated graphics card can improve graphics performance, a SmartNIC can improve network performance. In each case, a dedicated processor improves performance for a specific type of processing task.

In OpenShift Container Platform, you can configure hardware offloading for bare metal nodes that have a compatible SmartNIC. Hardware offloading is configured and enabled by the SR-IOV Network Operator.

Hardware offloading is not compatible with all workloads or application types. Only the following two communication types are supported:

pod-to-pod
pod-to-service, where the service is a ClusterIP service backed by a regular pod

In all cases, hardware offloading takes place only when those pods and services are assigned to nodes that have a compatible SmartNIC. Suppose, for example, that a pod on a node with hardware offloading tries to communicate with a service on a regular node. On the regular node, all the processing takes place in the kernel, so the overall performance of the pod-to-service communication is limited to the maximum performance of that regular node. Hardware offloading is not compatible with DPDK applications.

Enabling hardware offloading on a node, but not configuring pods to use, it can result in decreased throughput performance for pod traffic. You cannot configure hardware offloading for pods that are managed by OpenShift Container Platform.

24.12.2. Supported devices

Hardware offloading is supported on the following network interface controllers:

Table 24.15. Supported network interface controllers
Manufacturer	Model	Vendor ID	Device ID
Mellanox	MT27800 Family [ConnectX‑5]	15b3	1017
Mellanox	MT28880 Family [ConnectX‑5 Ex]	15b3	1019
Mellanox	MT2892 Family [ConnectX‑6 Dx]	15b3	101d
Mellanox	MT2894 Family [ConnectX-6 Lx]	15b3	101f
Mellanox	MT42822 BlueField-2 in ConnectX-6 NIC mode	15b3	a2d6

24.12.3. Prerequisites

Your cluster has at least one bare metal machine with a network interface controller that is supported for hardware offloading.
You installed the SR-IOV Network Operator.
Your cluster uses the OVN-Kubernetes network plugin.
In your OVN-Kubernetes network plugin configuration, the gatewayConfig.routingViaHost field is set to false.

24.12.4. Setting the SR-IOV Network Operator into systemd mode

To support hardware offloading, you must first set the SR-IOV Network Operator into systemd mode.

Prerequisites

You installed the OpenShift CLI (oc).
You have access to the cluster as a user that has the cluster-admin role.

Procedure

Create a SriovOperatorConfig custom resource (CR) to deploy all the SR-IOV Operator components:

Create a file named sriovOperatorConfig.yaml that contains the following YAML:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default 
  namespace: openshift-sriov-network-operator
spec:
  enableInjector: true
  enableOperatorWebhook: true
  configurationMode: "systemd" 
  logLevel: 2

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovOperatorConfig
metadata:
  name: default

1


  namespace: openshift-sriov-network-operator
spec:
  enableInjector: true
  enableOperatorWebhook: true
  configurationMode: "systemd"

2


  logLevel: 2

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1: The only valid name for the SriovOperatorConfig resource is default and it must be in the namespace where the Operator is deployed.
2: Setting the SR-IOV Network Operator into systemd mode is only relevant for Open vSwitch hardware offloading.

Create the resource by running the following command:

oc apply -f sriovOperatorConfig.yaml

$ oc apply -f sriovOperatorConfig.yaml

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24.12.5. Configuring a machine config pool for hardware offloading

To enable hardware offloading, you now create a dedicated machine config pool and configure it to work with the SR-IOV Network Operator.

Prerequisites

SR-IOV Network Operator installed and set into systemd mode.

Procedure

Create a machine config pool for machines you want to use hardware offloading on.

Create a file, such as mcp-offloading.yaml, with content like the following example:

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfigPool
metadata:
  name: mcp-offloading 
spec:
  machineConfigSelector:
    matchExpressions:
      - {key: machineconfiguration.openshift.io/role, operator: In, values: [worker,mcp-offloading]} 
  nodeSelector:
    matchLabels:
      node-role.kubernetes.io/mcp-offloading: ""

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfigPool
metadata:
  name: mcp-offloading

1


spec:
  machineConfigSelector:
    matchExpressions:
      - {key: machineconfiguration.openshift.io/role, operator: In, values: [worker,mcp-offloading]}

2


  nodeSelector:
    matchLabels:
      node-role.kubernetes.io/mcp-offloading: ""

3

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1 2: The name of your machine config pool for hardware offloading.
3: This node role label is used to add nodes to the machine config pool.

Apply the configuration for the machine config pool:
```
oc create -f mcp-offloading.yaml
```
```
$ oc create -f mcp-offloading.yaml
```
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Add nodes to the machine config pool. Label each node with the node role label of your pool:

oc label node worker-2 node-role.kubernetes.io/mcp-offloading=""

$ oc label node worker-2 node-role.kubernetes.io/mcp-offloading=""

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Optional: To verify that the new pool is created, run the following command:

oc get nodes

$ oc get nodes

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Example output

NAME       STATUS   ROLES                   AGE   VERSION
master-0   Ready    master                  2d    v1.26.0
master-1   Ready    master                  2d    v1.26.0
master-2   Ready    master                  2d    v1.26.0
worker-0   Ready    worker                  2d    v1.26.0
worker-1   Ready    worker                  2d    v1.26.0
worker-2   Ready    mcp-offloading,worker   47h   v1.26.0
worker-3   Ready    mcp-offloading,worker   47h   v1.26.0

NAME       STATUS   ROLES                   AGE   VERSION
master-0   Ready    master                  2d    v1.26.0
master-1   Ready    master                  2d    v1.26.0
master-2   Ready    master                  2d    v1.26.0
worker-0   Ready    worker                  2d    v1.26.0
worker-1   Ready    worker                  2d    v1.26.0
worker-2   Ready    mcp-offloading,worker   47h   v1.26.0
worker-3   Ready    mcp-offloading,worker   47h   v1.26.0

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Add this machine config pool to the SriovNetworkPoolConfig custom resource:

Create a file, such as sriov-pool-config.yaml, with content like the following example:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkPoolConfig
metadata:
  name: sriovnetworkpoolconfig-offload
  namespace: openshift-sriov-network-operator
spec:
  ovsHardwareOffloadConfig:
    name: mcp-offloading

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkPoolConfig
metadata:
  name: sriovnetworkpoolconfig-offload
  namespace: openshift-sriov-network-operator
spec:
  ovsHardwareOffloadConfig:
    name: mcp-offloading

1

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1: The name of your machine config pool for hardware offloading.

Apply the configuration:
```
oc create -f <SriovNetworkPoolConfig_name>.yaml
```
```
$ oc create -f <SriovNetworkPoolConfig_name>.yaml
```
Copy to Clipboard
Note
When you apply the configuration specified in a SriovNetworkPoolConfig object, the SR-IOV Operator drains and restarts the nodes in the machine config pool.
It might take several minutes for a configuration changes to apply.

24.12.6. Configuring the SR-IOV network node policy

You can create an SR-IOV network device configuration for a node by creating an SR-IOV network node policy. To enable hardware offloading, you must define the .spec.eSwitchMode field with the value "switchdev".

The following procedure creates an SR-IOV interface for a network interface controller with hardware offloading.

Prerequisites

You installed the OpenShift CLI (oc).
You have access to the cluster as a user with the cluster-admin role.

Procedure

Create a file, such as sriov-node-policy.yaml, with content like the following example:

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: sriov-node-policy <.>
  namespace: openshift-sriov-network-operator
spec:
  deviceType: netdevice <.>
  eSwitchMode: "switchdev" <.>
  nicSelector:
    deviceID: "1019"
    rootDevices:
    - 0000:d8:00.0
    vendor: "15b3"
    pfNames:
    - ens8f0
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 6
  priority: 5
  resourceName: mlxnics

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: sriov-node-policy <.>
  namespace: openshift-sriov-network-operator
spec:
  deviceType: netdevice <.>
  eSwitchMode: "switchdev" <.>
  nicSelector:
    deviceID: "1019"
    rootDevices:
    - 0000:d8:00.0
    vendor: "15b3"
    pfNames:
    - ens8f0
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: "true"
  numVfs: 6
  priority: 5
  resourceName: mlxnics

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<.> The name for the custom resource object. <.> Required. Hardware offloading is not supported with vfio-pci. <.> Required.

Apply the configuration for the policy:
```
oc create -f sriov-node-policy.yaml
```
```
$ oc create -f sriov-node-policy.yaml
```
Copy to Clipboard
Note
When you apply the configuration specified in a SriovNetworkPoolConfig object, the SR-IOV Operator drains and restarts the nodes in the machine config pool.
It might take several minutes for a configuration change to apply.

24.12.6.1. An example SR-IOV network node policy for OpenStack

The following example describes an SR-IOV interface for a network interface controller (NIC) with hardware offloading on Red Hat OpenStack Platform (RHOSP).

An SR-IOV interface for a NIC with hardware offloading on RHOSP

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: ${name}
  namespace: openshift-sriov-network-operator
spec:
  deviceType: switchdev
  isRdma: true
  nicSelector:
    netFilter: openstack/NetworkID:${net_id}
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: 'true'
  numVfs: 1
  priority: 99
  resourceName: ${name}

apiVersion: sriovnetwork.openshift.io/v1
kind: SriovNetworkNodePolicy
metadata:
  name: ${name}
  namespace: openshift-sriov-network-operator
spec:
  deviceType: switchdev
  isRdma: true
  nicSelector:
    netFilter: openstack/NetworkID:${net_id}
  nodeSelector:
    feature.node.kubernetes.io/network-sriov.capable: 'true'
  numVfs: 1
  priority: 99
  resourceName: ${name}

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24.12.7. Creating a network attachment definition

After you define the machine config pool and the SR-IOV network node policy, you can create a network attachment definition for the network interface card you specified.

Prerequisites

You installed the OpenShift CLI (oc).
You have access to the cluster as a user with the cluster-admin role.

Procedure

Create a file, such as net-attach-def.yaml, with content like the following example:

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: net-attach-def <.>
  namespace: net-attach-def <.>
  annotations:
    k8s.v1.cni.cncf.io/resourceName: openshift.io/mlxnics <.>
spec:
  config: '{"cniVersion":"0.3.1","name":"ovn-kubernetes","type":"ovn-k8s-cni-overlay","ipam":{},"dns":{}}'

apiVersion: "k8s.cni.cncf.io/v1"
kind: NetworkAttachmentDefinition
metadata:
  name: net-attach-def <.>
  namespace: net-attach-def <.>
  annotations:
    k8s.v1.cni.cncf.io/resourceName: openshift.io/mlxnics <.>
spec:
  config: '{"cniVersion":"0.3.1","name":"ovn-kubernetes","type":"ovn-k8s-cni-overlay","ipam":{},"dns":{}}'

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<.> The name for your network attachment definition. <.> The namespace for your network attachment definition. <.> This is the value of the spec.resourceName field you specified in the SriovNetworkNodePolicy object.

Apply the configuration for the network attachment definition:
```
oc create -f net-attach-def.yaml
```
```
$ oc create -f net-attach-def.yaml
```
Copy to Clipboard

Verification

Run the following command to see whether the new definition is present:

oc get net-attach-def -A

$ oc get net-attach-def -A

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Example output

NAMESPACE         NAME             AGE
net-attach-def    net-attach-def   43h

NAMESPACE         NAME             AGE
net-attach-def    net-attach-def   43h

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24.12.8. Adding the network attachment definition to your pods

After you create the machine config pool, the SriovNetworkPoolConfig and SriovNetworkNodePolicy custom resources, and the network attachment definition, you can apply these configurations to your pods by adding the network attachment definition to your pod specifications.

Procedure

In the pod specification, add the .metadata.annotations.k8s.v1.cni.cncf.io/networks field and specify the network attachment definition you created for hardware offloading:
```
....
metadata:
  annotations:
    v1.multus-cni.io/default-network: net-attach-def/net-attach-def <.>
```
```
....
metadata:
  annotations:
    v1.multus-cni.io/default-network: net-attach-def/net-attach-def <.>
```
Copy to Clipboard
<.> The value must be the name and namespace of the network attachment definition you created for hardware offloading.

24.13. Switching Bluefield-2 from DPU to NIC

You can switch the Bluefield-2 network device from data processing unit (DPU) mode to network interface controller (NIC) mode.

24.13.1. Switching Bluefield-2 from DPU mode to NIC mode

Use the following procedure to switch Bluefield-2 from data processing units (DPU) mode to network interface controller (NIC) mode.

Important

Currently, only switching Bluefield-2 from DPU to NIC mode is supported. Switching from NIC mode to DPU mode is unsupported.

Prerequisites

You have installed the SR-IOV Network Operator. For more information, see "Installing SR-IOV Network Operator".
You have updated Bluefield-2 to the latest firmware. For more information, see Firmware for NVIDIA BlueField-2.

Procedure

Add the following labels to each of your worker nodes by entering the following commands:

oc label node <example_node_name_one> node-role.kubernetes.io/sriov=

$ oc label node <example_node_name_one> node-role.kubernetes.io/sriov=

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oc label node <example_node_name_two> node-role.kubernetes.io/sriov=

$ oc label node <example_node_name_two> node-role.kubernetes.io/sriov=

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Create a machine config pool for the SR-IOV Network Operator, for example:

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfigPool
metadata:
  name: sriov
spec:
  machineConfigSelector:
    matchExpressions:
    - {key: machineconfiguration.openshift.io/role, operator: In, values: [worker,sriov]}
  nodeSelector:
    matchLabels:
      node-role.kubernetes.io/sriov: ""

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfigPool
metadata:
  name: sriov
spec:
  machineConfigSelector:
    matchExpressions:
    - {key: machineconfiguration.openshift.io/role, operator: In, values: [worker,sriov]}
  nodeSelector:
    matchLabels:
      node-role.kubernetes.io/sriov: ""

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Apply the following machineconfig.yaml file to the worker nodes:

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: sriov
  name: 99-bf2-dpu
spec:
  config:
    ignition:
      version: 3.2.0
    storage:
      files:
      - contents:
          source: data:text/plain;charset=utf-8;base64,ZmluZF9jb250YWluZXIoKSB7CiAgY3JpY3RsIHBzIC1vIGpzb24gfCBqcSAtciAnLmNvbnRhaW5lcnNbXSB8IHNlbGVjdCgubWV0YWRhdGEubmFtZT09InNyaW92LW5ldHdvcmstY29uZmlnLWRhZW1vbiIpIHwgLmlkJwp9CnVudGlsIG91dHB1dD0kKGZpbmRfY29udGFpbmVyKTsgW1sgLW4gIiRvdXRwdXQiIF1dOyBkbwogIGVjaG8gIndhaXRpbmcgZm9yIGNvbnRhaW5lciB0byBjb21lIHVwIgogIHNsZWVwIDE7CmRvbmUKISBzdWRvIGNyaWN0bCBleGVjICRvdXRwdXQgL2JpbmRhdGEvc2NyaXB0cy9iZjItc3dpdGNoLW1vZGUuc2ggIiRAIgo=
        mode: 0755
        overwrite: true
        path: /etc/default/switch_in_sriov_config_daemon.sh
    systemd:
      units:
      - name: dpu-switch.service
        enabled: true
        contents: |
          [Unit]
          Description=Switch BlueField2 card to NIC/DPU mode
          RequiresMountsFor=%t/containers
          Wants=network.target
          After=network-online.target kubelet.service
          [Service]
          SuccessExitStatus=0 120
          RemainAfterExit=True
          ExecStart=/bin/bash -c '/etc/default/switch_in_sriov_config_daemon.sh nic || shutdown -r now' 
          Type=oneshot
          [Install]
          WantedBy=multi-user.target

apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: sriov
  name: 99-bf2-dpu
spec:
  config:
    ignition:
      version: 3.2.0
    storage:
      files:
      - contents:
          source: data:text/plain;charset=utf-8;base64,ZmluZF9jb250YWluZXIoKSB7CiAgY3JpY3RsIHBzIC1vIGpzb24gfCBqcSAtciAnLmNvbnRhaW5lcnNbXSB8IHNlbGVjdCgubWV0YWRhdGEubmFtZT09InNyaW92LW5ldHdvcmstY29uZmlnLWRhZW1vbiIpIHwgLmlkJwp9CnVudGlsIG91dHB1dD0kKGZpbmRfY29udGFpbmVyKTsgW1sgLW4gIiRvdXRwdXQiIF1dOyBkbwogIGVjaG8gIndhaXRpbmcgZm9yIGNvbnRhaW5lciB0byBjb21lIHVwIgogIHNsZWVwIDE7CmRvbmUKISBzdWRvIGNyaWN0bCBleGVjICRvdXRwdXQgL2JpbmRhdGEvc2NyaXB0cy9iZjItc3dpdGNoLW1vZGUuc2ggIiRAIgo=
        mode: 0755
        overwrite: true
        path: /etc/default/switch_in_sriov_config_daemon.sh
    systemd:
      units:
      - name: dpu-switch.service
        enabled: true
        contents: |
          [Unit]
          Description=Switch BlueField2 card to NIC/DPU mode
          RequiresMountsFor=%t/containers
          Wants=network.target
          After=network-online.target kubelet.service
          [Service]
          SuccessExitStatus=0 120
          RemainAfterExit=True
          ExecStart=/bin/bash -c '/etc/default/switch_in_sriov_config_daemon.sh nic || shutdown -r now'

1


          Type=oneshot
          [Install]
          WantedBy=multi-user.target

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1: Optional: The PCI address of a specific card can optionally be specified, for example ExecStart=/bin/bash -c '/etc/default/switch_in_sriov_config_daemon.sh nic 0000:5e:00.0 || echo done'. By default, the first device is selected. If there is more than one device, you must specify which PCI address to be used. The PCI address must be the same on all nodes that are switching Bluefield-2 from DPU mode to NIC mode.

Wait for the worker nodes to restart. After restarting, the Bluefield-2 network device on the worker nodes is switched into NIC mode.
Optional: You might need to restart the host hardware because most recent Bluefield-2 firmware releases require a hardware restart to switch into NIC mode.

24.14. Uninstalling the SR-IOV Network Operator

To uninstall the SR-IOV Network Operator, you must delete any running SR-IOV workloads, uninstall the Operator, and delete the webhooks that the Operator used.

24.14.1. Uninstalling the SR-IOV Network Operator

As a cluster administrator, you can uninstall the SR-IOV Network Operator.

Prerequisites

You have access to an OpenShift Container Platform cluster using an account with cluster-admin permissions.
You have the SR-IOV Network Operator installed.

Procedure

Delete all SR-IOV custom resources (CRs):

oc delete sriovnetwork -n openshift-sriov-network-operator --all

$ oc delete sriovnetwork -n openshift-sriov-network-operator --all

Copy to Clipboard

oc delete sriovnetworknodepolicy -n openshift-sriov-network-operator --all

$ oc delete sriovnetworknodepolicy -n openshift-sriov-network-operator --all

Copy to Clipboard

oc delete sriovibnetwork -n openshift-sriov-network-operator --all

$ oc delete sriovibnetwork -n openshift-sriov-network-operator --all

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Follow the instructions in the "Deleting Operators from a cluster" section to remove the SR-IOV Network Operator from your cluster.

Delete the SR-IOV custom resource definitions that remain in the cluster after the SR-IOV Network Operator is uninstalled:

oc delete crd sriovibnetworks.sriovnetwork.openshift.io

$ oc delete crd sriovibnetworks.sriovnetwork.openshift.io

Copy to Clipboard

oc delete crd sriovnetworknodepolicies.sriovnetwork.openshift.io

$ oc delete crd sriovnetworknodepolicies.sriovnetwork.openshift.io

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oc delete crd sriovnetworknodestates.sriovnetwork.openshift.io

$ oc delete crd sriovnetworknodestates.sriovnetwork.openshift.io

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oc delete crd sriovnetworkpoolconfigs.sriovnetwork.openshift.io

$ oc delete crd sriovnetworkpoolconfigs.sriovnetwork.openshift.io

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oc delete crd sriovnetworks.sriovnetwork.openshift.io

$ oc delete crd sriovnetworks.sriovnetwork.openshift.io

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oc delete crd sriovoperatorconfigs.sriovnetwork.openshift.io

$ oc delete crd sriovoperatorconfigs.sriovnetwork.openshift.io

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Delete the SR-IOV webhooks:

oc delete mutatingwebhookconfigurations network-resources-injector-config

$ oc delete mutatingwebhookconfigurations network-resources-injector-config

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oc delete MutatingWebhookConfiguration sriov-operator-webhook-config

$ oc delete MutatingWebhookConfiguration sriov-operator-webhook-config

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oc delete ValidatingWebhookConfiguration sriov-operator-webhook-config

$ oc delete ValidatingWebhookConfiguration sriov-operator-webhook-config

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Delete the SR-IOV Network Operator namespace:

oc delete namespace openshift-sriov-network-operator

$ oc delete namespace openshift-sriov-network-operator

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Chapter 25. OVN-Kubernetes network plugin

25.1. About the OVN-Kubernetes network plugin

The OpenShift Container Platform cluster uses a virtualized network for pod and service networks.

Part of Red Hat OpenShift Networking, the OVN-Kubernetes network plugin is the default network provider for OpenShift Container Platform. OVN-Kubernetes is based on Open Virtual Network (OVN) and provides an overlay-based networking implementation.

Important

For a cloud controller manager (CCM) with the --cloud-provider=external option set to cloud-provider-vsphere, a known issue exists for a cluster that operates in a networking environment with multiple subnets.

When you upgrade your cluster from OpenShift Container Platform 4.12 to OpenShift Container Platform 4.13, the CCM selects a wrong node IP address and this operation generates an error message in the namespaces/openshift-cloud-controller-manager/pods/vsphere-cloud-controller-manager logs. The error message indicates a mismatch with the node IP address and the vsphere-cloud-controller-manager pod IP address in your cluster.

The known issue might not impact the cluster upgrade operation, but you can set the correct IP address in both the nodeNetworking.external.networkSubnetCidr and the nodeNetworking.internal.networkSubnetCidr parameters for the nodeNetworking object that your cluster uses for its networking requirements.

A cluster that uses the OVN-Kubernetes plugin also runs Open vSwitch (OVS) on each node. OVN configures OVS on each node to implement the declared network configuration.

Note

OVN-Kubernetes is the default networking solution for OpenShift Container Platform and single-node OpenShift deployments.

OVN-Kubernetes, which arose from the OVS project, uses many of the same constructs, such as open flow rules, to determine how packets travel through the network. For more information, see the Open Virtual Network website.

OVN-Kubernetes is a series of daemons for OVS that translate virtual network configurations into OpenFlow rules. OpenFlow is a protocol for communicating with network switches and routers, providing a means for remotely controlling the flow of network traffic on a network device, allowing network administrators to configure, manage, and monitor the flow of network traffic.

OVN-Kubernetes provides more of the advanced functionality not available with OpenFlow. OVN supports distributed virtual routing, distributed logical switches, access control, DHCP and DNS. OVN implements distributed virtual routing within logic flows which equate to open flows. So for example if you have a pod that sends out a DHCP request on the network, it sends out that broadcast looking for DHCP address there will be a logic flow rule that matches that packet, and it responds giving it a gateway, a DNS server an IP address and so on.

OVN-Kubernetes runs a daemon on each node. There are daemon sets for the databases and for the OVN controller that run on every node. The OVN controller programs the Open vSwitch daemon on the nodes to support the network provider features; egress IPs, firewalls, routers, hybrid networking, IPSEC encryption, IPv6, network policy, network policy logs, hardware offloading and multicast.

25.1.1. OVN-Kubernetes purpose

The OVN-Kubernetes network plugin is an open-source, fully-featured Kubernetes CNI plugin that uses Open Virtual Network (OVN) to manage network traffic flows. OVN is a community developed, vendor-agnostic network virtualization solution. The OVN-Kubernetes network plugin:

Uses OVN (Open Virtual Network) to manage network traffic flows. OVN is a community developed, vendor-agnostic network virtualization solution.
Implements Kubernetes network policy support, including ingress and egress rules.
Uses the Geneve (Generic Network Virtualization Encapsulation) protocol rather than VXLAN to create an overlay network between nodes.

The OVN-Kubernetes network plugin provides the following advantages over OpenShift SDN.

Full support for IPv6 single-stack and IPv4/IPv6 dual-stack networking on supported platforms
Support for hybrid clusters with both Linux and Microsoft Windows workloads
Optional IPsec encryption of intra-cluster communications
Offload of network data processing from host CPU to compatible network cards and data processing units (DPUs)

25.1.2. Supported network plugin feature matrix

Red Hat OpenShift Networking offers two options for the network plugin, OpenShift SDN and OVN-Kubernetes, for the network plugin. The following table summarizes the current feature support for both network plugins:

Table 25.1. Default CNI network plugin feature comparison
Feature	OpenShift SDN	OVN-Kubernetes
Egress IPs	Supported	Supported
Egress firewall	Supported	Supported ^[1]
Egress router	Supported	Supported ^[2]
Hybrid networking	Not supported	Supported
IPsec encryption for intra-cluster communication	Not supported	Supported
IPv4 single-stack	Supported	Supported
IPv6 single-stack	Not supported	Supported ^[3]
IPv4/IPv6 dual-stack	Not Supported	Supported ^[4]
IPv6/IPv4 dual-stack	Not supported	Supported ^[5]
Kubernetes network policy	Supported	Supported
Kubernetes network policy logs	Not supported	Supported
Hardware offloading	Not supported	Supported
Multicast	Supported	Supported

Egress firewall is also known as egress network policy in OpenShift SDN. This is not the same as network policy egress.
Egress router for OVN-Kubernetes supports only redirect mode.
IPv6 single-stack networking on a bare-metal platform.
IPv4/IPv6 dual-stack networking on bare-metal, VMware vSphere (installer-provisioned infrastructure installations only), IBM Power®, and IBM Z® platforms. On VMware vSphere, dual-stack networking limitations exist.
IPv6/IPv4 dual-stack networking on bare-metal and IBM Power® platforms.

25.1.3. OVN-Kubernetes IPv6 and dual-stack limitations

The OVN-Kubernetes network plugin has the following limitations:

For clusters configured for dual-stack networking, both IPv4 and IPv6 traffic must use the same network interface as the default gateway. If this requirement is not met, pods on the host in the ovnkube-node daemon set enter the CrashLoopBackOff state. If you display a pod with a command such as oc get pod -n openshift-ovn-kubernetes -l app=ovnkube-node -o yaml, the status field contains more than one message about the default gateway, as shown in the following output:
```
I1006 16:09:50.985852   60651 helper_linux.go:73] Found default gateway interface br-ex 192.168.127.1
I1006 16:09:50.985923   60651 helper_linux.go:73] Found default gateway interface ens4 fe80::5054:ff:febe:bcd4
F1006 16:09:50.985939   60651 ovnkube.go:130] multiple gateway interfaces detected: br-ex ens4
```
```
I1006 16:09:50.985852   60651 helper_linux.go:73] Found default gateway interface br-ex 192.168.127.1
I1006 16:09:50.985923   60651 helper_linux.go:73] Found default gateway interface ens4 fe80::5054:ff:febe:bcd4
F1006 16:09:50.985939   60651 ovnkube.go:130] multiple gateway interfaces detected: br-ex ens4
```
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The only resolution is to reconfigure the host networking so that both IP families use the same network interface for the default gateway.
For clusters configured for dual-stack networking, both the IPv4 and IPv6 routing tables must contain the default gateway. If this requirement is not met, pods on the host in the ovnkube-node daemon set enter the CrashLoopBackOff state. If you display a pod with a command such as oc get pod -n openshift-ovn-kubernetes -l app=ovnkube-node -o yaml, the status field contains more than one message about the default gateway, as shown in the following output:
```
I0512 19:07:17.589083  108432 helper_linux.go:74] Found default gateway interface br-ex 192.168.123.1
F0512 19:07:17.589141  108432 ovnkube.go:133] failed to get default gateway interface
```
```
I0512 19:07:17.589083  108432 helper_linux.go:74] Found default gateway interface br-ex 192.168.123.1
F0512 19:07:17.589141  108432 ovnkube.go:133] failed to get default gateway interface
```
Copy to Clipboard
The only resolution is to reconfigure the host networking so that both IP families contain the default gateway.

25.1.4. Session affinity

Session affinity is a feature that applies to Kubernetes Service objects. You can use session affinity if you want to ensure that each time you connect to a <service_VIP>:<Port>, the traffic is always load balanced to the same back end. For more information, including how to set session affinity based on a client’s IP address, see Session affinity.

Stickiness timeout for session affinity

The OVN-Kubernetes network plugin for OpenShift Container Platform calculates the stickiness timeout for a session from a client based on the last packet. For example, if you run a curl command 10 times, the sticky session timer starts from the tenth packet not the first. As a result, if the client is continuously contacting the service, then the session never times out. The timeout starts when the service has not received a packet for the amount of time set by the timeoutSeconds parameter.

25.2. OVN-Kubernetes architecture

25.2.1. Introduction to OVN-Kubernetes architecture

The following diagram shows the OVN-Kubernetes architecture.

Figure 25.1. OVK-Kubernetes architecture

The key components are:

Cloud Management System (CMS) - A platform specific client for OVN that provides a CMS specific plugin for OVN integration. The plugin translates the cloud management system’s concept of the logical network configuration, stored in the CMS configuration database in a CMS-specific format, into an intermediate representation understood by OVN.
OVN Northbound database (nbdb) - Stores the logical network configuration passed by the CMS plugin.
OVN Southbound database (sbdb) - Stores the physical and logical network configuration state for OpenVswitch (OVS) system on each node, including tables that bind them.
ovn-northd - This is the intermediary client between nbdb and sbdb. It translates the logical network configuration in terms of conventional network concepts, taken from the nbdb, into logical data path flows in the sbdb below it. The container name is northd and it runs in the ovnkube-master pods.
ovn-controller - This is the OVN agent that interacts with OVS and hypervisors, for any information or update that is needed for sbdb. The ovn-controller reads logical flows from the sbdb, translates them into OpenFlow flows and sends them to the node’s OVS daemon. The container name is ovn-controller and it runs in the ovnkube-node pods.

The OVN northbound database has the logical network configuration passed down to it by the cloud management system (CMS). The OVN northbound Database contains the current desired state of the network, presented as a collection of logical ports, logical switches, logical routers, and more. The ovn-northd (northd container) connects to the OVN northbound database and the OVN southbound database. It translates the logical network configuration in terms of conventional network concepts, taken from the OVN northbound Database, into logical data path flows in the OVN southbound database.

The OVN southbound database has physical and logical representations of the network and binding tables that link them together. Every node in the cluster is represented in the southbound database, and you can see the ports that are connected to it. It also contains all the logic flows, the logic flows are shared with the ovn-controller process that runs on each node and the ovn-controller turns those into OpenFlow rules to program Open vSwitch.

The Kubernetes control plane nodes each contain an ovnkube-master pod which hosts containers for the OVN northbound and southbound databases. All OVN northbound databases form a Raft cluster and all southbound databases form a separate Raft cluster. At any given time a single ovnkube-master is the leader and the other ovnkube-master pods are followers.

25.2.2. Listing all resources in the OVN-Kubernetes project

Finding the resources and containers that run in the OVN-Kubernetes project is important to help you understand the OVN-Kubernetes networking implementation.

Prerequisites

Access to the cluster as a user with the cluster-admin role.
The OpenShift CLI (oc) installed.

Procedure

Run the following command to get all resources, endpoints, and ConfigMaps in the OVN-Kubernetes project:

oc get all,ep,cm -n openshift-ovn-kubernetes

$ oc get all,ep,cm -n openshift-ovn-kubernetes

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Example output

NAME                       READY   STATUS    RESTARTS      AGE
pod/ovnkube-master-9g7zt   6/6     Running   1 (48m ago)   57m
pod/ovnkube-master-lqs4v   6/6     Running   0             57m
pod/ovnkube-master-vxhtq   6/6     Running   0             57m
pod/ovnkube-node-9k9kc     5/5     Running   0             57m
pod/ovnkube-node-jg52r     5/5     Running   0             51m
pod/ovnkube-node-k8wf7     5/5     Running   0             57m
pod/ovnkube-node-tlwk6     5/5     Running   0             47m
pod/ovnkube-node-xsvnk     5/5     Running   0             57m

NAME                            TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)             AGE
service/ovn-kubernetes-master   ClusterIP   None         <none>        9102/TCP            57m
service/ovn-kubernetes-node     ClusterIP   None         <none>        9103/TCP,9105/TCP   57m
service/ovnkube-db              ClusterIP   None         <none>        9641/TCP,9642/TCP   57m

NAME                            DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                                                 AGE
daemonset.apps/ovnkube-master   3         3         3       3            3           beta.kubernetes.io/os=linux,node-role.kubernetes.io/master=   57m
daemonset.apps/ovnkube-node     5         5         5       5            5           beta.kubernetes.io/os=linux                                   57m

NAME                              ENDPOINTS                                                        AGE
endpoints/ovn-kubernetes-master   10.0.132.11:9102,10.0.151.18:9102,10.0.192.45:9102               57m
endpoints/ovn-kubernetes-node     10.0.132.11:9105,10.0.143.72:9105,10.0.151.18:9105 + 7 more...   57m
endpoints/ovnkube-db              10.0.132.11:9642,10.0.151.18:9642,10.0.192.45:9642 + 3 more...   57m

NAME                                 DATA   AGE
configmap/control-plane-status       1      55m
configmap/kube-root-ca.crt           1      57m
configmap/openshift-service-ca.crt   1      57m
configmap/ovn-ca                     1      57m
configmap/ovnkube-config             1      57m
configmap/signer-ca                  1      57m

NAME                       READY   STATUS    RESTARTS      AGE
pod/ovnkube-master-9g7zt   6/6     Running   1 (48m ago)   57m
pod/ovnkube-master-lqs4v   6/6     Running   0             57m
pod/ovnkube-master-vxhtq   6/6     Running   0             57m
pod/ovnkube-node-9k9kc     5/5     Running   0             57m
pod/ovnkube-node-jg52r     5/5     Running   0             51m
pod/ovnkube-node-k8wf7     5/5     Running   0             57m
pod/ovnkube-node-tlwk6     5/5     Running   0             47m
pod/ovnkube-node-xsvnk     5/5     Running   0             57m

NAME                            TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)             AGE
service/ovn-kubernetes-master   ClusterIP   None         <none>        9102/TCP            57m
service/ovn-kubernetes-node     ClusterIP   None         <none>        9103/TCP,9105/TCP   57m
service/ovnkube-db              ClusterIP   None         <none>        9641/TCP,9642/TCP   57m

NAME                            DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                                                 AGE
daemonset.apps/ovnkube-master   3         3         3       3            3           beta.kubernetes.io/os=linux,node-role.kubernetes.io/master=   57m
daemonset.apps/ovnkube-node     5         5         5       5            5           beta.kubernetes.io/os=linux                                   57m

NAME                              ENDPOINTS                                                        AGE
endpoints/ovn-kubernetes-master   10.0.132.11:9102,10.0.151.18:9102,10.0.192.45:9102               57m
endpoints/ovn-kubernetes-node     10.0.132.11:9105,10.0.143.72:9105,10.0.151.18:9105 + 7 more...   57m
endpoints/ovnkube-db              10.0.132.11:9642,10.0.151.18:9642,10.0.192.45:9642 + 3 more...   57m

NAME                                 DATA   AGE
configmap/control-plane-status       1      55m
configmap/kube-root-ca.crt           1      57m
configmap/openshift-service-ca.crt   1      57m
configmap/ovn-ca                     1      57m
configmap/ovnkube-config             1      57m
configmap/signer-ca                  1      57m

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There are three ovnkube-masters that run on the control plane nodes, and two daemon sets used to deploy the ovnkube-master and ovnkube-node pods. There is one ovnkube-node pod for each node in the cluster. The ovnkube-config ConfigMap has the OpenShift Container Platform OVN-Kubernetes configurations started by online-master and ovnkube-node.

List all the containers in the ovnkube-master pods by running the following command:
```
oc get pods ovnkube-master-9g7zt \
-o jsonpath='{.spec.containers[*].name}' -n openshift-ovn-kubernetes
```
```
$ oc get pods ovnkube-master-9g7zt \
-o jsonpath='{.spec.containers[*].name}' -n openshift-ovn-kubernetes
```
Copy to Clipboard
Expected output
```
northd nbdb kube-rbac-proxy sbdb ovnkube-master ovn-dbchecker
```
```
northd nbdb kube-rbac-proxy sbdb ovnkube-master ovn-dbchecker
```
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The ovnkube-master pod is made up of several containers. It is responsible for hosting the northbound database (nbdb container), the southbound database (sbdb container), watching for cluster events for pods, egressIP, namespaces, services, endpoints, egress firewall, and network policy and writing them to the northbound database (ovnkube-master pod), as well as managing pod subnet allocation to nodes.
List all the containers in the ovnkube-node pods by running the following command:
```
oc get pods ovnkube-node-jg52r \
-o jsonpath='{.spec.containers[*].name}' -n openshift-ovn-kubernetes
```
```
$ oc get pods ovnkube-node-jg52r \
-o jsonpath='{.spec.containers[*].name}' -n openshift-ovn-kubernetes
```
Copy to Clipboard
Expected output
```
ovn-controller ovn-acl-logging kube-rbac-proxy kube-rbac-proxy-ovn-metrics ovnkube-node
```
```
ovn-controller ovn-acl-logging kube-rbac-proxy kube-rbac-proxy-ovn-metrics ovnkube-node
```
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The ovnkube-node pod has a container (ovn-controller) that resides on each OpenShift Container Platform node. Each node’s ovn-controller connects the OVN northbound to the OVN southbound database to learn about the OVN configuration. The ovn-controller connects southbound to ovs-vswitchd as an OpenFlow controller, for control over network traffic, and to the local ovsdb-server to allow it to monitor and control Open vSwitch configuration.

List the currently elected OVN-Kubernetes master leader by running the following command:

oc get lease -n openshift-ovn-kubernetes

$ oc get lease -n openshift-ovn-kubernetes

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Expected output

NAME                    HOLDER                               AGE
ovn-kubernetes-master   ci-ln-gz990pb-72292-rthz2-master-2   50m

NAME                    HOLDER                               AGE
ovn-kubernetes-master   ci-ln-gz990pb-72292-rthz2-master-2   50m

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25.2.3. Listing the OVN-Kubernetes northbound database contents

To understand logic flow rules you need to examine the northbound database and understand what objects are there to see how they are translated into logic flow rules. The up to date information is present on the OVN Raft leader and this procedure describes how to find the Raft leader and subsequently query it to list the OVN northbound database contents.

Prerequisites

Access to the cluster as a user with the cluster-admin role.
The OpenShift CLI (oc) installed.

Procedure

Find the OVN Raft leader for the northbound database.

Note

The Raft leader stores the most up to date information.

List the pods by running the following command:

oc get po -n openshift-ovn-kubernetes

$ oc get po -n openshift-ovn-kubernetes

Copy to Clipboard

Example output

NAME                   READY   STATUS    RESTARTS       AGE
ovnkube-master-7j97q   6/6     Running   2 (148m ago)   149m
ovnkube-master-gt4ms   6/6     Running   1 (140m ago)   147m
ovnkube-master-mk6p6   6/6     Running   0              148m
ovnkube-node-8qvtr     5/5     Running   0              149m
ovnkube-node-fqdc9     5/5     Running   0              149m
ovnkube-node-tlfwv     5/5     Running   0              149m
ovnkube-node-wlwkn     5/5     Running   0              142m

NAME                   READY   STATUS    RESTARTS       AGE
ovnkube-master-7j97q   6/6     Running   2 (148m ago)   149m
ovnkube-master-gt4ms   6/6     Running   1 (140m ago)   147m
ovnkube-master-mk6p6   6/6     Running   0              148m
ovnkube-node-8qvtr     5/5     Running   0              149m
ovnkube-node-fqdc9     5/5     Running   0              149m
ovnkube-node-tlfwv     5/5     Running   0              149m
ovnkube-node-wlwkn     5/5     Running   0              142m

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Choose one of the master pods at random and run the following command:

oc exec -n openshift-ovn-kubernetes ovnkube-master-7j97q \
-- /usr/bin/ovn-appctl -t /var/run/ovn/ovnnb_db.ctl \
--timeout=3 cluster/status OVN_Northbound

$ oc exec -n openshift-ovn-kubernetes ovnkube-master-7j97q \
-- /usr/bin/ovn-appctl -t /var/run/ovn/ovnnb_db.ctl \
--timeout=3 cluster/status OVN_Northbound

Copy to Clipboard

Example output

Defaulted container "northd" out of: northd, nbdb, kube-rbac-proxy, sbdb, ovnkube-master, ovn-dbchecker
1c57
Name: OVN_Northbound
Cluster ID: c48a (c48aa5c0-a704-4c77-a066-24fe99d9b338)
Server ID: 1c57 (1c57b6fc-2849-49b7-8679-fbf18bafe339)
Address: ssl:10.0.147.219:9643
Status: cluster member
Role: follower 
Term: 5
Leader: 2b4f 
Vote: unknown

Election timer: 10000
Log: [2, 3018]
Entries not yet committed: 0
Entries not yet applied: 0
Connections: ->0000 ->0000 <-8844 <-2b4f
Disconnections: 0
Servers:
    1c57 (1c57 at ssl:10.0.147.219:9643) (self)
    8844 (8844 at ssl:10.0.163.212:9643) last msg 8928047 ms ago
    2b4f (2b4f at ssl:10.0.242.240:9643) last msg 620 ms ago

Defaulted container "northd" out of: northd, nbdb, kube-rbac-proxy, sbdb, ovnkube-master, ovn-dbchecker
1c57
Name: OVN_Northbound
Cluster ID: c48a (c48aa5c0-a704-4c77-a066-24fe99d9b338)
Server ID: 1c57 (1c57b6fc-2849-49b7-8679-fbf18bafe339)
Address: ssl:10.0.147.219:9643
Status: cluster member
Role: follower

1


Term: 5
Leader: 2b4f

2


Vote: unknown

Election timer: 10000
Log: [2, 3018]
Entries not yet committed: 0
Entries not yet applied: 0
Connections: ->0000 ->0000 <-8844 <-2b4f
Disconnections: 0
Servers:
    1c57 (1c57 at ssl:10.0.147.219:9643) (self)
    8844 (8844 at ssl:10.0.163.212:9643) last msg 8928047 ms ago
    2b4f (2b4f at ssl:10.0.242.240:9643) last msg 620 ms ago

3

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1: This pod is identified as a follower
2: The leader is identified as 2b4f
3: The 2b4f is on IP address 10.0.242.240

Find the ovnkube-master pod running on IP Address 10.0.242.240 using the following command:

oc get po -o wide -n openshift-ovn-kubernetes | grep 10.0.242.240 | grep -v ovnkube-node

$ oc get po -o wide -n openshift-ovn-kubernetes | grep 10.0.242.240 | grep -v ovnkube-node

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Example output

ovnkube-master-gt4ms   6/6     Running             1 (143m ago)   150m   10.0.242.240   ip-10-0-242-240.ec2.internal   <none>           <none>

ovnkube-master-gt4ms   6/6     Running             1 (143m ago)   150m   10.0.242.240   ip-10-0-242-240.ec2.internal   <none>           <none>

Copy to Clipboard

The ovnkube-master-gt4ms pod runs on IP Address 10.0.242.240.

Run the following command to show all the objects in the northbound database:
```
oc exec -n openshift-ovn-kubernetes -it ovnkube-master-gt4ms \
-c northd -- ovn-nbctl show
```
```
$ oc exec -n openshift-ovn-kubernetes -it ovnkube-master-gt4ms \
-c northd -- ovn-nbctl show
```
Copy to Clipboard
The output is too long to list here. The list includes the NAT rules, logical switches, load balancers and so on.
Run the following command to display the options available with the command ovn-nbctl:
```
oc exec -n openshift-ovn-kubernetes -it ovnkube-master-mk6p6 \
-c northd ovn-nbctl --help
```
```
$ oc exec -n openshift-ovn-kubernetes -it ovnkube-master-mk6p6 \
-c northd ovn-nbctl --help
```
Copy to Clipboard
You can narrow down and focus on specific components by using some of the following commands:

Run the following command to show the list of logical routers:

oc exec -n openshift-ovn-kubernetes -it ovnkube-master-gt4ms \
-c northd -- ovn-nbctl lr-list

$ oc exec -n openshift-ovn-kubernetes -it ovnkube-master-gt4ms \
-c northd -- ovn-nbctl lr-list

Copy to Clipboard

Example output

f971f1f3-5112-402f-9d1e-48f1d091ff04 (GR_ip-10-0-145-205.ec2.internal)
69c992d8-a4cf-429e-81a3-5361209ffe44 (GR_ip-10-0-147-219.ec2.internal)
7d164271-af9e-4283-b84a-48f2a44851cd (GR_ip-10-0-163-212.ec2.internal)
111052e3-c395-408b-97b2-8dd0a20a29a5 (GR_ip-10-0-165-9.ec2.internal)
ed50ce33-df5d-48e8-8862-2df6a59169a0 (GR_ip-10-0-209-170.ec2.internal)
f44e2a96-8d1e-4a4d-abae-ed8728ac6851 (GR_ip-10-0-242-240.ec2.internal)
ef3d0057-e557-4b1a-b3c6-fcc3463790b0 (ovn_cluster_router)

f971f1f3-5112-402f-9d1e-48f1d091ff04 (GR_ip-10-0-145-205.ec2.internal)
69c992d8-a4cf-429e-81a3-5361209ffe44 (GR_ip-10-0-147-219.ec2.internal)
7d164271-af9e-4283-b84a-48f2a44851cd (GR_ip-10-0-163-212.ec2.internal)
111052e3-c395-408b-97b2-8dd0a20a29a5 (GR_ip-10-0-165-9.ec2.internal)
ed50ce33-df5d-48e8-8862-2df6a59169a0 (GR_ip-10-0-209-170.ec2.internal)
f44e2a96-8d1e-4a4d-abae-ed8728ac6851 (GR_ip-10-0-242-240.ec2.internal)
ef3d0057-e557-4b1a-b3c6-fcc3463790b0 (ovn_cluster_router)

Copy to Clipboard

Note

From this output you can see there is router on each node plus an ovn_cluster_router.

Run the following command to show the list of logical switches:

oc exec -n openshift-ovn-kubernetes -it ovnkube-master-gt4ms \
-c northd -- ovn-nbctl ls-list

$ oc exec -n openshift-ovn-kubernetes -it ovnkube-master-gt4ms \
-c northd -- ovn-nbctl ls-list

Copy to Clipboard

Example output

82808c5c-b3bc-414a-bb59-8fec4b07eb14 (ext_ip-10-0-145-205.ec2.internal)
3d22444f-0272-4c51-afc6-de9e03db3291 (ext_ip-10-0-147-219.ec2.internal)
bf73b9df-59ab-4c58-a456-ce8205b34ac5 (ext_ip-10-0-163-212.ec2.internal)
bee1e8d0-ec87-45eb-b98b-63f9ec213e5e (ext_ip-10-0-165-9.ec2.internal)
812f08f2-6476-4abf-9a78-635f8516f95e (ext_ip-10-0-209-170.ec2.internal)
f65e710b-32f9-482b-8eab-8d96a44799c1 (ext_ip-10-0-242-240.ec2.internal)
84dad700-afb8-4129-86f9-923a1ddeace9 (ip-10-0-145-205.ec2.internal)
1b7b448b-e36c-4ca3-9f38-4a2cf6814bfd (ip-10-0-147-219.ec2.internal)
d92d1f56-2606-4f23-8b6a-4396a78951de (ip-10-0-163-212.ec2.internal)
6864a6b2-de15-4de3-92d8-f95014b6f28f (ip-10-0-165-9.ec2.internal)
c26bf618-4d7e-4afd-804f-1a2cbc96ec6d (ip-10-0-209-170.ec2.internal)
ab9a4526-44ed-4f82-ae1c-e20da04947d9 (ip-10-0-242-240.ec2.internal)
a8588aba-21da-4276-ba0f-9d68e88911f0 (join)

82808c5c-b3bc-414a-bb59-8fec4b07eb14 (ext_ip-10-0-145-205.ec2.internal)
3d22444f-0272-4c51-afc6-de9e03db3291 (ext_ip-10-0-147-219.ec2.internal)
bf73b9df-59ab-4c58-a456-ce8205b34ac5 (ext_ip-10-0-163-212.ec2.internal)
bee1e8d0-ec87-45eb-b98b-63f9ec213e5e (ext_ip-10-0-165-9.ec2.internal)
812f08f2-6476-4abf-9a78-635f8516f95e (ext_ip-10-0-209-170.ec2.internal)
f65e710b-32f9-482b-8eab-8d96a44799c1 (ext_ip-10-0-242-240.ec2.internal)
84dad700-afb8-4129-86f9-923a1ddeace9 (ip-10-0-145-205.ec2.internal)
1b7b448b-e36c-4ca3-9f38-4a2cf6814bfd (ip-10-0-147-219.ec2.internal)
d92d1f56-2606-4f23-8b6a-4396a78951de (ip-10-0-163-212.ec2.internal)
6864a6b2-de15-4de3-92d8-f95014b6f28f (ip-10-0-165-9.ec2.internal)
c26bf618-4d7e-4afd-804f-1a2cbc96ec6d (ip-10-0-209-170.ec2.internal)
ab9a4526-44ed-4f82-ae1c-e20da04947d9 (ip-10-0-242-240.ec2.internal)
a8588aba-21da-4276-ba0f-9d68e88911f0 (join)

Copy to Clipboard

Note

From this output you can see there is an ext switch for each node plus switches with the node name itself and a join switch.

Run the following command to show the list of load balancers:

oc exec -n openshift-ovn-kubernetes -it ovnkube-master-gt4ms \
-c northd -- ovn-nbctl lb-list

$ oc exec -n openshift-ovn-kubernetes -it ovnkube-master-gt4ms \
-c northd -- ovn-nbctl lb-list

Copy to Clipboard

Example output

UUID                                    LB                  PROTO      VIP                     IPs
f0fb50f9-4968-4b55-908c-616bae4db0a2    Service_default/    tcp        172.30.0.1:443          10.0.147.219:6443,10.0.163.212:6443,169.254.169.2:6443
0dc42012-4f5b-432e-ae01-2cc4bfe81b00    Service_default/    tcp        172.30.0.1:443          10.0.147.219:6443,169.254.169.2:6443,10.0.242.240:6443
f7fff5d5-5eff-4a40-98b1-3a4ba8f7f69c    Service_default/    tcp        172.30.0.1:443          169.254.169.2:6443,10.0.163.212:6443,10.0.242.240:6443
12fe57a0-50a4-4a1b-ac10-5f288badee07    Service_default/    tcp        172.30.0.1:443          10.0.147.219:6443,10.0.163.212:6443,10.0.242.240:6443
3f137fbf-0b78-4875-ba44-fbf89f254cf7    Service_openshif    tcp        172.30.23.153:443       10.130.0.14:8443
174199fe-0562-4141-b410-12094db922a7    Service_openshif    tcp        172.30.69.51:50051      10.130.0.84:50051
5ee2d4bd-c9e2-4d16-a6df-f54cd17c9ac3    Service_openshif    tcp        172.30.143.87:9001      10.0.145.205:9001,10.0.147.219:9001,10.0.163.212:9001,10.0.165.9:9001,10.0.209.170:9001,10.0.242.240:9001
a056ae3d-83f8-45bc-9c80-ef89bce7b162    Service_openshif    tcp        172.30.164.74:443       10.0.147.219:6443,10.0.163.212:6443,10.0.242.240:6443
bac51f3d-9a6f-4f5e-ac02-28fd343a332a    Service_openshif    tcp        172.30.0.10:53          10.131.0.6:5353
                                                            tcp        172.30.0.10:9154        10.131.0.6:9154
48105bbc-51d7-4178-b975-417433f9c20a    Service_openshif    tcp        172.30.26.159:2379      10.0.147.219:2379,169.254.169.2:2379,10.0.242.240:2379
                                                            tcp        172.30.26.159:9979      10.0.147.219:9979,169.254.169.2:9979,10.0.242.240:9979
7de2b8fc-342a-415f-ac13-1a493f4e39c0    Service_openshif    tcp        172.30.53.219:443       10.128.0.7:8443
                                                            tcp        172.30.53.219:9192      10.128.0.7:9192
2cef36bc-d720-4afb-8d95-9350eff1d27a    Service_openshif    tcp        172.30.81.66:443        10.128.0.23:8443
365cb6fb-e15e-45a4-a55b-21868b3cf513    Service_openshif    tcp        172.30.96.51:50051      10.130.0.19:50051
41691cbb-ec55-4cdb-8431-afce679c5e8d    Service_openshif    tcp        172.30.98.218:9099      169.254.169.2:9099
82df10ba-8143-400b-977a-8f5f416a4541    Service_openshif    tcp        172.30.26.159:2379      10.0.147.219:2379,10.0.163.212:2379,169.254.169.2:2379
                                                            tcp        172.30.26.159:9979      10.0.147.219:9979,10.0.163.212:9979,169.254.169.2:9979
debe7f3a-39a8-490e-bc0a-ebbfafdffb16    Service_openshif    tcp        172.30.23.244:443       10.128.0.48:8443,10.129.0.27:8443,10.130.0.45:8443
8a749239-02d9-4dc2-8737-716528e0da7b    Service_openshif    tcp        172.30.124.255:8443     10.128.0.14:8443
880c7c78-c790-403d-a3cb-9f06592717a3    Service_openshif    tcp        172.30.0.10:53          10.130.0.20:5353
                                                            tcp        172.30.0.10:9154        10.130.0.20:9154
d2f39078-6751-4311-a161-815bbaf7f9c7    Service_openshif    tcp        172.30.26.159:2379      169.254.169.2:2379,10.0.163.212:2379,10.0.242.240:2379
                                                            tcp        172.30.26.159:9979      169.254.169.2:9979,10.0.163.212:9979,10.0.242.240:9979
30948278-602b-455c-934a-28e64c46de12    Service_openshif    tcp        172.30.157.35:9443      10.130.0.43:9443
2cc7e376-7c02-4a82-89e8-dfa1e23fb003    Service_openshif    tcp        172.30.159.212:17698    10.128.0.48:17698,10.129.0.27:17698,10.130.0.45:17698
e7d22d35-61c2-40c2-bc30-265cff8ed18d    Service_openshif    tcp        172.30.143.87:9001      10.0.145.205:9001,10.0.147.219:9001,10.0.163.212:9001,10.0.165.9:9001,10.0.209.170:9001,169.254.169.2:9001
75164e75-e0c5-40fb-9636-bfdbf4223a02    Service_openshif    tcp        172.30.150.68:1936      10.129.4.8:1936,10.131.0.10:1936
                                                            tcp        172.30.150.68:443       10.129.4.8:443,10.131.0.10:443
                                                            tcp        172.30.150.68:80        10.129.4.8:80,10.131.0.10:80
7bc4ee74-dccf-47e9-9149-b011f09aff39    Service_openshif    tcp        172.30.164.74:443       10.0.147.219:6443,10.0.163.212:6443,169.254.169.2:6443
0db59e74-1cc6-470c-bf44-57c520e0aa8f    Service_openshif    tcp        10.0.163.212:31460
                                                            tcp        10.0.163.212:32361
c300e134-018c-49af-9f84-9deb1d0715f8    Service_openshif    tcp        172.30.42.244:50051     10.130.0.47:50051
5e352773-429b-4881-afb3-a13b7ba8b081    Service_openshif    tcp        172.30.244.66:443       10.129.0.8:8443,10.130.0.8:8443
54b82d32-1939-4465-a87d-f26321442a7a    Service_openshif    tcp        172.30.12.9:8443        10.128.0.35:8443

UUID                                    LB                  PROTO      VIP                     IPs
f0fb50f9-4968-4b55-908c-616bae4db0a2    Service_default/    tcp        172.30.0.1:443          10.0.147.219:6443,10.0.163.212:6443,169.254.169.2:6443
0dc42012-4f5b-432e-ae01-2cc4bfe81b00    Service_default/    tcp        172.30.0.1:443          10.0.147.219:6443,169.254.169.2:6443,10.0.242.240:6443
f7fff5d5-5eff-4a40-98b1-3a4ba8f7f69c    Service_default/    tcp        172.30.0.1:443          169.254.169.2:6443,10.0.163.212:6443,10.0.242.240:6443
12fe57a0-50a4-4a1b-ac10-5f288badee07    Service_default/    tcp        172.30.0.1:443          10.0.147.219:6443,10.0.163.212:6443,10.0.242.240:6443
3f137fbf-0b78-4875-ba44-fbf89f254cf7    Service_openshif    tcp        172.30.23.153:443       10.130.0.14:8443
174199fe-0562-4141-b410-12094db922a7    Service_openshif    tcp        172.30.69.51:50051      10.130.0.84:50051
5ee2d4bd-c9e2-4d16-a6df-f54cd17c9ac3    Service_openshif    tcp        172.30.143.87:9001      10.0.145.205:9001,10.0.147.219:9001,10.0.163.212:9001,10.0.165.9:9001,10.0.209.170:9001,10.0.242.240:9001
a056ae3d-83f8-45bc-9c80-ef89bce7b162    Service_openshif    tcp        172.30.164.74:443       10.0.147.219:6443,10.0.163.212:6443,10.0.242.240:6443
bac51f3d-9a6f-4f5e-ac02-28fd343a332a    Service_openshif    tcp        172.30.0.10:53          10.131.0.6:5353
                                                            tcp        172.30.0.10:9154        10.131.0.6:9154
48105bbc-51d7-4178-b975-417433f9c20a    Service_openshif    tcp        172.30.26.159:2379      10.0.147.219:2379,169.254.169.2:2379,10.0.242.240:2379
                                                            tcp        172.30.26.159:9979      10.0.147.219:9979,169.254.169.2:9979,10.0.242.240:9979
7de2b8fc-342a-415f-ac13-1a493f4e39c0    Service_openshif    tcp        172.30.53.219:443       10.128.0.7:8443
                                                            tcp        172.30.53.219:9192      10.128.0.7:9192
2cef36bc-d720-4afb-8d95-9350eff1d27a    Service_openshif    tcp        172.30.81.66:443        10.128.0.23:8443
365cb6fb-e15e-45a4-a55b-21868b3cf513    Service_openshif    tcp        172.30.96.51:50051      10.130.0.19:50051
41691cbb-ec55-4cdb-8431-afce679c5e8d    Service_openshif    tcp        172.30.98.218:9099      169.254.169.2:9099
82df10ba-8143-400b-977a-8f5f416a4541    Service_openshif    tcp        172.30.26.159:2379      10.0.147.219:2379,10.0.163.212:2379,169.254.169.2:2379
                                                            tcp        172.30.26.159:9979      10.0.147.219:9979,10.0.163.212:9979,169.254.169.2:9979
debe7f3a-39a8-490e-bc0a-ebbfafdffb16    Service_openshif    tcp        172.30.23.244:443       10.128.0.48:8443,10.129.0.27:8443,10.130.0.45:8443
8a749239-02d9-4dc2-8737-716528e0da7b    Service_openshif    tcp        172.30.124.255:8443     10.128.0.14:8443
880c7c78-c790-403d-a3cb-9f06592717a3    Service_openshif    tcp        172.30.0.10:53          10.130.0.20:5353
                                                            tcp        172.30.0.10:9154        10.130.0.20:9154
d2f39078-6751-4311-a161-815bbaf7f9c7    Service_openshif    tcp        172.30.26.159:2379      169.254.169.2:2379,10.0.163.212:2379,10.0.242.240:2379
                                                            tcp        172.30.26.159:9979      169.254.169.2:9979,10.0.163.212:9979,10.0.242.240:9979
30948278-602b-455c-934a-28e64c46de12    Service_openshif    tcp        172.30.157.35:9443      10.130.0.43:9443
2cc7e376-7c02-4a82-89e8-dfa1e23fb003    Service_openshif    tcp        172.30.159.212:17698    10.128.0.48:17698,10.129.0.27:17698,10.130.0.45:17698
e7d22d35-61c2-40c2-bc30-265cff8ed18d    Service_openshif    tcp        172.30.143.87:9001      10.0.145.205:9001,10.0.147.219:9001,10.0.163.212:9001,10.0.165.9:9001,10.0.209.170:9001,169.254.169.2:9001
75164e75-e0c5-40fb-9636-bfdbf4223a02    Service_openshif    tcp        172.30.150.68:1936      10.129.4.8:1936,10.131.0.10:1936
                                                            tcp        172.30.150.68:443       10.129.4.8:443,10.131.0.10:443
                                                            tcp        172.30.150.68:80        10.129.4.8:80,10.131.0.10:80
7bc4ee74-dccf-47e9-9149-b011f09aff39    Service_openshif    tcp        172.30.164.74:443       10.0.147.219:6443,10.0.163.212:6443,169.254.169.2:6443
0db59e74-1cc6-470c-bf44-57c520e0aa8f    Service_openshif    tcp        10.0.163.212:31460
                                                            tcp        10.0.163.212:32361
c300e134-018c-49af-9f84-9deb1d0715f8    Service_openshif    tcp        172.30.42.244:50051     10.130.0.47:50051
5e352773-429b-4881-afb3-a13b7ba8b081    Service_openshif    tcp        172.30.244.66:443       10.129.0.8:8443,10.130.0.8:8443
54b82d32-1939-4465-a87d-f26321442a7a    Service_openshif    tcp        172.30.12.9:8443        10.128.0.35:8443

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Note

From this truncated output you can see there are many OVN-Kubernetes load balancers. Load balancers in OVN-Kubernetes are representations of services.

25.2.4. Command-line arguments for ovn-nbctl to examine northbound database contents

The following table describes the command-line arguments that can be used with ovn-nbctl to examine the contents of the northbound database.

Table 25.2. Command-line arguments to examine northbound database contents
Argument	Description
`ovn-nbctl show`	An overview of the northbound database contents.
`ovn-nbctl show <switch_or_router>`	Show the details associated with the specified switch or router.
`ovn-nbctl lr-list`	Show the logical routers.
`ovn-nbctl lrp-list <router>`	Using the router information from `ovn-nbctl lr-list` to show the router ports.
`ovn-nbctl lr-nat-list <router>`	Show network address translation details for the specified router.
`ovn-nbctl ls-list`	Show the logical switches
`ovn-nbctl lsp-list <switch>`	Using the switch information from `ovn-nbctl ls-list` to show the switch port.
`ovn-nbctl lsp-get-type <port>`	Get the type for the logical port.
`ovn-nbctl lb-list`	Show the load balancers.

25.2.5. Listing the OVN-Kubernetes southbound database contents

Logic flow rules are stored in the southbound database that is a representation of your infrastructure. The up to date information is present on the OVN Raft leader and this procedure describes how to find the Raft leader and query it to list the OVN southbound database contents.

Prerequisites

Access to the cluster as a user with the cluster-admin role.
The OpenShift CLI (oc) installed.

Procedure

Find the OVN Raft leader for the southbound database.

Note

The Raft leader stores the most up to date information.

List the pods by running the following command:

oc get po -n openshift-ovn-kubernetes

$ oc get po -n openshift-ovn-kubernetes

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Example output

NAME                   READY   STATUS    RESTARTS       AGE
ovnkube-master-7j97q   6/6     Running   2 (134m ago)   135m
ovnkube-master-gt4ms   6/6     Running   1 (126m ago)   133m
ovnkube-master-mk6p6   6/6     Running   0              134m
ovnkube-node-8qvtr     5/5     Running   0              135m
ovnkube-node-bqztb     5/5     Running   0              117m
ovnkube-node-fqdc9     5/5     Running   0              135m
ovnkube-node-tlfwv     5/5     Running   0              135m
ovnkube-node-wlwkn     5/5     Running   0              128m

NAME                   READY   STATUS    RESTARTS       AGE
ovnkube-master-7j97q   6/6     Running   2 (134m ago)   135m
ovnkube-master-gt4ms   6/6     Running   1 (126m ago)   133m
ovnkube-master-mk6p6   6/6     Running   0              134m
ovnkube-node-8qvtr     5/5     Running   0              135m
ovnkube-node-bqztb     5/5     Running   0              117m
ovnkube-node-fqdc9     5/5     Running   0              135m
ovnkube-node-tlfwv     5/5     Running   0              135m
ovnkube-node-wlwkn     5/5     Running   0              128m

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Choose one of the master pods at random and run the following command to find the OVN southbound Raft leader:

oc exec -n openshift-ovn-kubernetes ovnkube-master-7j97q \
-- /usr/bin/ovn-appctl -t /var/run/ovn/ovnsb_db.ctl \
--timeout=3 cluster/status OVN_Southbound

$ oc exec -n openshift-ovn-kubernetes ovnkube-master-7j97q \
-- /usr/bin/ovn-appctl -t /var/run/ovn/ovnsb_db.ctl \
--timeout=3 cluster/status OVN_Southbound

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Example output

Defaulted container "northd" out of: northd, nbdb, kube-rbac-proxy, sbdb, ovnkube-master, ovn-dbchecker
1930
Name: OVN_Southbound
Cluster ID: f772 (f77273c0-7986-42dd-bd3c-a9f18e25701f)
Server ID: 1930 (1930f4b7-314b-406f-9dcb-b81fe2729ae1)
Address: ssl:10.0.147.219:9644
Status: cluster member
Role: follower 
Term: 3
Leader: 7081 
Vote: unknown

Election timer: 16000
Log: [2, 2423]
Entries not yet committed: 0
Entries not yet applied: 0
Connections: ->0000 ->7145 <-7081 <-7145
Disconnections: 0
Servers:
    7081 (7081 at ssl:10.0.163.212:9644) last msg 59 ms ago 
    1930 (1930 at ssl:10.0.147.219:9644) (self)
    7145 (7145 at ssl:10.0.242.240:9644) last msg 7871735 ms ago

Defaulted container "northd" out of: northd, nbdb, kube-rbac-proxy, sbdb, ovnkube-master, ovn-dbchecker
1930
Name: OVN_Southbound
Cluster ID: f772 (f77273c0-7986-42dd-bd3c-a9f18e25701f)
Server ID: 1930 (1930f4b7-314b-406f-9dcb-b81fe2729ae1)
Address: ssl:10.0.147.219:9644
Status: cluster member
Role: follower

1


Term: 3
Leader: 7081

2


Vote: unknown

Election timer: 16000
Log: [2, 2423]
Entries not yet committed: 0
Entries not yet applied: 0
Connections: ->0000 ->7145 <-7081 <-7145
Disconnections: 0
Servers:
    7081 (7081 at ssl:10.0.163.212:9644) last msg 59 ms ago

3


    1930 (1930 at ssl:10.0.147.219:9644) (self)
    7145 (7145 at ssl:10.0.242.240:9644) last msg 7871735 ms ago

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1: This pod is identified as a follower
2: The leader is identified as 7081
3: The 7081 is on IP address 10.0.163.212

Find the ovnkube-master pod running on IP Address 10.0.163.212 using the following command:

oc get po -o wide -n openshift-ovn-kubernetes | grep 10.0.163.212 | grep -v ovnkube-node

$ oc get po -o wide -n openshift-ovn-kubernetes | grep 10.0.163.212 | grep -v ovnkube-node

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Example output

ovnkube-master-mk6p6   6/6     Running   0              136m   10.0.163.212   ip-10-0-163-212.ec2.internal   <none>           <none>

ovnkube-master-mk6p6   6/6     Running   0              136m   10.0.163.212   ip-10-0-163-212.ec2.internal   <none>           <none>

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The ovnkube-master-mk6p6 pod runs on IP Address 10.0.163.212.

Run the following command to show all the information stored in the southbound database:

oc exec -n openshift-ovn-kubernetes -it ovnkube-master-mk6p6 \
-c northd -- ovn-sbctl show

$ oc exec -n openshift-ovn-kubernetes -it ovnkube-master-mk6p6 \
-c northd -- ovn-sbctl show

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Example output

Chassis "8ca57b28-9834-45f0-99b0-96486c22e1be"
    hostname: ip-10-0-156-16.ec2.internal
    Encap geneve
        ip: "10.0.156.16"
        options: {csum="true"}
    Port_Binding k8s-ip-10-0-156-16.ec2.internal
    Port_Binding etor-GR_ip-10-0-156-16.ec2.internal
    Port_Binding jtor-GR_ip-10-0-156-16.ec2.internal
    Port_Binding openshift-ingress-canary_ingress-canary-hsblx
    Port_Binding rtoj-GR_ip-10-0-156-16.ec2.internal
    Port_Binding openshift-monitoring_prometheus-adapter-658fc5967-9l46x
    Port_Binding rtoe-GR_ip-10-0-156-16.ec2.internal
    Port_Binding openshift-multus_network-metrics-daemon-77nvz
    Port_Binding openshift-ingress_router-default-64fd8c67c7-df598
    Port_Binding openshift-dns_dns-default-ttpcq
    Port_Binding openshift-monitoring_alertmanager-main-0
    Port_Binding openshift-e2e-loki_loki-promtail-g2pbh
    Port_Binding openshift-network-diagnostics_network-check-target-m6tn4
    Port_Binding openshift-monitoring_thanos-querier-75b5cf8dcb-qf8qj
    Port_Binding cr-rtos-ip-10-0-156-16.ec2.internal
    Port_Binding openshift-image-registry_image-registry-7b7bc44566-mp9b8

Chassis "8ca57b28-9834-45f0-99b0-96486c22e1be"
    hostname: ip-10-0-156-16.ec2.internal
    Encap geneve
        ip: "10.0.156.16"
        options: {csum="true"}
    Port_Binding k8s-ip-10-0-156-16.ec2.internal
    Port_Binding etor-GR_ip-10-0-156-16.ec2.internal
    Port_Binding jtor-GR_ip-10-0-156-16.ec2.internal
    Port_Binding openshift-ingress-canary_ingress-canary-hsblx
    Port_Binding rtoj-GR_ip-10-0-156-16.ec2.internal
    Port_Binding openshift-monitoring_prometheus-adapter-658fc5967-9l46x
    Port_Binding rtoe-GR_ip-10-0-156-16.ec2.internal
    Port_Binding openshift-multus_network-metrics-daemon-77nvz
    Port_Binding openshift-ingress_router-default-64fd8c67c7-df598
    Port_Binding openshift-dns_dns-default-ttpcq
    Port_Binding openshift-monitoring_alertmanager-main-0
    Port_Binding openshift-e2e-loki_loki-promtail-g2pbh
    Port_Binding openshift-network-diagnostics_network-check-target-m6tn4
    Port_Binding openshift-monitoring_thanos-querier-75b5cf8dcb-qf8qj
    Port_Binding cr-rtos-ip-10-0-156-16.ec2.internal
    Port_Binding openshift-image-registry_image-registry-7b7bc44566-mp9b8

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This detailed output shows the chassis and the ports that are attached to the chassis which in this case are all of the router ports and anything that runs like host networking. Any pods communicate out to the wider network using source network address translation (SNAT). Their IP address is translated into the IP address of the node that the pod is running on and then sent out into the network.

In addition to the chassis information the southbound database has all the logic flows and those logic flows are then sent to the ovn-controller running on each of the nodes. The ovn-controller translates the logic flows into open flow rules and ultimately programs OpenvSwitch so that your pods can then follow open flow rules and make it out of the network.

Run the following command to display the options available with the command ovn-sbctl:

oc exec -n openshift-ovn-kubernetes -it ovnkube-master-mk6p6 \
-c northd -- ovn-sbctl --help

$ oc exec -n openshift-ovn-kubernetes -it ovnkube-master-mk6p6 \
-c northd -- ovn-sbctl --help

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25.2.6. Command-line arguments for ovn-sbctl to examine southbound database contents

The following table describes the command-line arguments that can be used with ovn-sbctl to examine the contents of the southbound database.

Table 25.3. Command-line arguments to examine southbound database contents
Argument	Description
`ovn-sbctl show`	Overview of the southbound database contents.
`ovn-sbctl list Port_Binding <port>`	List the contents of southbound database for a the specified port .
`ovn-sbctl dump-flows`	List the logical flows.

25.2.7. OVN-Kubernetes logical architecture

OVN is a network virtualization solution. It creates logical switches and routers. These switches and routers are interconnected to create any network topologies. When you run ovnkube-trace with the log level set to 2 or 5 the OVN-Kubernetes logical components are exposed. The following diagram shows how the routers and switches are connected in OpenShift Container Platform.

Figure 25.2. OVN-Kubernetes router and switch components

The key components involved in packet processing are:

Gateway routers: Gateway routers sometimes called L3 gateway routers, are typically used between the distributed routers and the physical network. Gateway routers including their logical patch ports are bound to a physical location (not distributed), or chassis. The patch ports on this router are known as l3gateway ports in the ovn-southbound database (ovn-sbdb).
Distributed logical routers: Distributed logical routers and the logical switches behind them, to which virtual machines and containers attach, effectively reside on each hypervisor.
Join local switch: Join local switches are used to connect the distributed router and gateway routers. It reduces the number of IP addresses needed on the distributed router.
Logical switches with patch ports: Logical switches with patch ports are used to virtualize the network stack. They connect remote logical ports through tunnels.
Logical switches with localnet ports: Logical switches with localnet ports are used to connect OVN to the physical network. They connect remote logical ports by bridging the packets to directly connected physical L2 segments using localnet ports.
Patch ports: Patch ports represent connectivity between logical switches and logical routers and between peer logical routers. A single connection has a pair of patch ports at each such point of connectivity, one on each side.
l3gateway ports: l3gateway ports are the port binding entries in the ovn-sbdb for logical patch ports used in the gateway routers. They are called l3gateway ports rather than patch ports just to portray the fact that these ports are bound to a chassis just like the gateway router itself.
localnet ports: localnet ports are present on the bridged logical switches that allows a connection to a locally accessible network from each ovn-controller instance. This helps model the direct connectivity to the physical network from the logical switches. A logical switch can only have a single localnet port attached to it.

25.2.7.1. Installing network-tools on local host

Install network-tools on your local host to make a collection of tools available for debugging OpenShift Container Platform cluster network issues.

Procedure

Clone the network-tools repository onto your workstation with the following command:

git clone git@github.com:openshift/network-tools.git

$ git clone git@github.com:openshift/network-tools.git

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Change into the directory for the repository you just cloned:
```
cd network-tools
```
```
$ cd network-tools
```
Copy to Clipboard

Optional: List all available commands:

./debug-scripts/network-tools -h

$ ./debug-scripts/network-tools -h

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25.2.7.2. Running network-tools

Get information about the logical switches and routers by running network-tools.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster as a user with cluster-admin privileges.
You have installed network-tools on local host.

Procedure

List the routers by running the following command:

./debug-scripts/network-tools ovn-db-run-command ovn-nbctl lr-list

$ ./debug-scripts/network-tools ovn-db-run-command ovn-nbctl lr-list

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Example output

Leader pod is ovnkube-master-vslqm
5351ddd1-f181-4e77-afc6-b48b0a9df953 (GR_helix13.lab.eng.tlv2.redhat.com)
ccf9349e-1948-4df8-954e-39fb0c2d4d06 (GR_helix14.lab.eng.tlv2.redhat.com)
e426b918-75a8-4220-9e76-20b7758f92b7 (GR_hlxcl7-master-0.hlxcl7.lab.eng.tlv2.redhat.com)
dded77c8-0cc3-4b99-8420-56cd2ae6a840 (GR_hlxcl7-master-1.hlxcl7.lab.eng.tlv2.redhat.com)
4f6747e6-e7ba-4e0c-8dcd-94c8efa51798 (GR_hlxcl7-master-2.hlxcl7.lab.eng.tlv2.redhat.com)
52232654-336e-4952-98b9-0b8601e370b4 (ovn_cluster_router)

Leader pod is ovnkube-master-vslqm
5351ddd1-f181-4e77-afc6-b48b0a9df953 (GR_helix13.lab.eng.tlv2.redhat.com)
ccf9349e-1948-4df8-954e-39fb0c2d4d06 (GR_helix14.lab.eng.tlv2.redhat.com)
e426b918-75a8-4220-9e76-20b7758f92b7 (GR_hlxcl7-master-0.hlxcl7.lab.eng.tlv2.redhat.com)
dded77c8-0cc3-4b99-8420-56cd2ae6a840 (GR_hlxcl7-master-1.hlxcl7.lab.eng.tlv2.redhat.com)
4f6747e6-e7ba-4e0c-8dcd-94c8efa51798 (GR_hlxcl7-master-2.hlxcl7.lab.eng.tlv2.redhat.com)
52232654-336e-4952-98b9-0b8601e370b4 (ovn_cluster_router)

Copy to Clipboard

List the localnet ports by running the following command:

./debug-scripts/network-tools ovn-db-run-command \
ovn-sbctl find Port_Binding type=localnet

$ ./debug-scripts/network-tools ovn-db-run-command \
ovn-sbctl find Port_Binding type=localnet

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Example output

Leader pod is ovnkube-master-vslqm
_uuid               : 3de79191-cca8-4c28-be5a-a228f0f9ebfc
additional_chassis  : []
additional_encap    : []
chassis             : []
datapath            : 3f1a4928-7ff5-471f-9092-fe5f5c67d15c
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : br-ex_helix13.lab.eng.tlv2.redhat.com
mac                 : [unknown]
nat_addresses       : []
options             : {network_name=physnet}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 2
type                : localnet
up                  : false
virtual_parent      : []

_uuid               : dbe21daf-9594-4849-b8f0-5efbfa09a455
additional_chassis  : []
additional_encap    : []
chassis             : []
datapath            : db2a6067-fe7c-4d11-95a7-ff2321329e11
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : br-ex_hlxcl7-master-2.hlxcl7.lab.eng.tlv2.redhat.com
mac                 : [unknown]
nat_addresses       : []
options             : {network_name=physnet}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 2
type                : localnet
up                  : false
virtual_parent      : []

[...]

Leader pod is ovnkube-master-vslqm
_uuid               : 3de79191-cca8-4c28-be5a-a228f0f9ebfc
additional_chassis  : []
additional_encap    : []
chassis             : []
datapath            : 3f1a4928-7ff5-471f-9092-fe5f5c67d15c
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : br-ex_helix13.lab.eng.tlv2.redhat.com
mac                 : [unknown]
nat_addresses       : []
options             : {network_name=physnet}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 2
type                : localnet
up                  : false
virtual_parent      : []

_uuid               : dbe21daf-9594-4849-b8f0-5efbfa09a455
additional_chassis  : []
additional_encap    : []
chassis             : []
datapath            : db2a6067-fe7c-4d11-95a7-ff2321329e11
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : br-ex_hlxcl7-master-2.hlxcl7.lab.eng.tlv2.redhat.com
mac                 : [unknown]
nat_addresses       : []
options             : {network_name=physnet}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 2
type                : localnet
up                  : false
virtual_parent      : []

[...]

Copy to Clipboard

List the l3gateway ports by running the following command:

./debug-scripts/network-tools ovn-db-run-command \
ovn-sbctl find Port_Binding type=l3gateway

$ ./debug-scripts/network-tools ovn-db-run-command \
ovn-sbctl find Port_Binding type=l3gateway

Copy to Clipboard

Example output

Leader pod is ovnkube-master-vslqm
_uuid               : 9314dc80-39e1-4af7-9cc0-ae8a9708ed59
additional_chassis  : []
additional_encap    : []
chassis             : 336a923d-99e8-4e71-89a6-12564fde5760
datapath            : db2a6067-fe7c-4d11-95a7-ff2321329e11
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : etor-GR_hlxcl7-master-2.hlxcl7.lab.eng.tlv2.redhat.com
mac                 : ["52:54:00:3e:95:d3"]
nat_addresses       : ["52:54:00:3e:95:d3 10.46.56.77"]
options             : {l3gateway-chassis="7eb1f1c3-87c2-4f68-8e89-60f5ca810971", peer=rtoe-GR_hlxcl7-master-2.hlxcl7.lab.eng.tlv2.redhat.com}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 1
type                : l3gateway
up                  : true
virtual_parent      : []

_uuid               : ad7eb303-b411-4e9f-8d36-d07f1f268e27
additional_chassis  : []
additional_encap    : []
chassis             : f41453b8-29c5-4f39-b86b-e82cf344bce4
datapath            : 082e7a60-d9c7-464b-b6ec-117d3426645a
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : etor-GR_helix14.lab.eng.tlv2.redhat.com
mac                 : ["34:48:ed:f3:e2:2c"]
nat_addresses       : ["34:48:ed:f3:e2:2c 10.46.56.14"]
options             : {l3gateway-chassis="2e8abe3a-cb94-4593-9037-f5f9596325e2", peer=rtoe-GR_helix14.lab.eng.tlv2.redhat.com}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 1
type                : l3gateway
up                  : true
virtual_parent      : []

[...]

Leader pod is ovnkube-master-vslqm
_uuid               : 9314dc80-39e1-4af7-9cc0-ae8a9708ed59
additional_chassis  : []
additional_encap    : []
chassis             : 336a923d-99e8-4e71-89a6-12564fde5760
datapath            : db2a6067-fe7c-4d11-95a7-ff2321329e11
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : etor-GR_hlxcl7-master-2.hlxcl7.lab.eng.tlv2.redhat.com
mac                 : ["52:54:00:3e:95:d3"]
nat_addresses       : ["52:54:00:3e:95:d3 10.46.56.77"]
options             : {l3gateway-chassis="7eb1f1c3-87c2-4f68-8e89-60f5ca810971", peer=rtoe-GR_hlxcl7-master-2.hlxcl7.lab.eng.tlv2.redhat.com}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 1
type                : l3gateway
up                  : true
virtual_parent      : []

_uuid               : ad7eb303-b411-4e9f-8d36-d07f1f268e27
additional_chassis  : []
additional_encap    : []
chassis             : f41453b8-29c5-4f39-b86b-e82cf344bce4
datapath            : 082e7a60-d9c7-464b-b6ec-117d3426645a
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : etor-GR_helix14.lab.eng.tlv2.redhat.com
mac                 : ["34:48:ed:f3:e2:2c"]
nat_addresses       : ["34:48:ed:f3:e2:2c 10.46.56.14"]
options             : {l3gateway-chassis="2e8abe3a-cb94-4593-9037-f5f9596325e2", peer=rtoe-GR_helix14.lab.eng.tlv2.redhat.com}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 1
type                : l3gateway
up                  : true
virtual_parent      : []

[...]

Copy to Clipboard

List the patch ports by running the following command:

./debug-scripts/network-tools ovn-db-run-command \
ovn-sbctl find Port_Binding type=patch

$ ./debug-scripts/network-tools ovn-db-run-command \
ovn-sbctl find Port_Binding type=patch

Copy to Clipboard

Example output

Leader pod is ovnkube-master-vslqm
_uuid               : c48b1380-ff26-4965-a644-6bd5b5946c61
additional_chassis  : []
additional_encap    : []
chassis             : []
datapath            : 72734d65-fae1-4bd9-a1ee-1bf4e085a060
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : jtor-ovn_cluster_router
mac                 : [router]
nat_addresses       : []
options             : {peer=rtoj-ovn_cluster_router}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 4
type                : patch
up                  : false
virtual_parent      : []

_uuid               : 5df51302-f3cd-415b-a059-ac24389938f7
additional_chassis  : []
additional_encap    : []
chassis             : []
datapath            : 0551c90f-e891-4909-8e9e-acc7909e06d0
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : rtos-hlxcl7-master-1.hlxcl7.lab.eng.tlv2.redhat.com
mac                 : ["0a:58:0a:82:00:01 10.130.0.1/23"]
nat_addresses       : []
options             : {chassis-redirect-port=cr-rtos-hlxcl7-master-1.hlxcl7.lab.eng.tlv2.redhat.com, peer=stor-hlxcl7-master-1.hlxcl7.lab.eng.tlv2.redhat.com}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 4
type                : patch
up                  : false
virtual_parent      : []

[...]

Leader pod is ovnkube-master-vslqm
_uuid               : c48b1380-ff26-4965-a644-6bd5b5946c61
additional_chassis  : []
additional_encap    : []
chassis             : []
datapath            : 72734d65-fae1-4bd9-a1ee-1bf4e085a060
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : jtor-ovn_cluster_router
mac                 : [router]
nat_addresses       : []
options             : {peer=rtoj-ovn_cluster_router}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 4
type                : patch
up                  : false
virtual_parent      : []

_uuid               : 5df51302-f3cd-415b-a059-ac24389938f7
additional_chassis  : []
additional_encap    : []
chassis             : []
datapath            : 0551c90f-e891-4909-8e9e-acc7909e06d0
encap               : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
logical_port        : rtos-hlxcl7-master-1.hlxcl7.lab.eng.tlv2.redhat.com
mac                 : ["0a:58:0a:82:00:01 10.130.0.1/23"]
nat_addresses       : []
options             : {chassis-redirect-port=cr-rtos-hlxcl7-master-1.hlxcl7.lab.eng.tlv2.redhat.com, peer=stor-hlxcl7-master-1.hlxcl7.lab.eng.tlv2.redhat.com}
parent_port         : []
port_security       : []
requested_additional_chassis: []
requested_chassis   : []
tag                 : []
tunnel_key          : 4
type                : patch
up                  : false
virtual_parent      : []

[...]

Copy to Clipboard

25.3. Troubleshooting OVN-Kubernetes

OVN-Kubernetes has many sources of built-in health checks and logs.

25.3.1. Monitoring OVN-Kubernetes health by using readiness probes

The ovnkube-master and ovnkube-node pods have containers configured with readiness probes.

Prerequisites

Access to the OpenShift CLI (oc).
You have access to the cluster with cluster-admin privileges.
You have installed jq.

Procedure

Review the details of the ovnkube-master readiness probe by running the following command:
```
oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-master \
-o json | jq '.items[0].spec.containers[] | .name,.readinessProbe'
```
```
$ oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-master \
-o json | jq '.items[0].spec.containers[] | .name,.readinessProbe'
```
Copy to Clipboard
The readiness probe for the northbound and southbound database containers in the ovnkube-master pod checks for the health of the Raft cluster hosting the databases.
Review the details of the ovnkube-node readiness probe by running the following command:
```
oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-master \
-o json | jq '.items[0].spec.containers[] | .name,.readinessProbe'
```
```
$ oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-master \
-o json | jq '.items[0].spec.containers[] | .name,.readinessProbe'
```
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The ovnkube-node container in the ovnkube-node pod has a readiness probe to verify the presence of the ovn-kubernetes CNI configuration file, the absence of which would indicate that the pod is not running or is not ready to accept requests to configure pods.
Show all events including the probe failures, for the namespace by using the following command:
```
oc get events -n openshift-ovn-kubernetes
```
```
$ oc get events -n openshift-ovn-kubernetes
```
Copy to Clipboard

Show the events for just this pod:

oc describe pod ovnkube-master-tp2z8 -n openshift-ovn-kubernetes

$ oc describe pod ovnkube-master-tp2z8 -n openshift-ovn-kubernetes

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Show the messages and statuses from the cluster network operator:

oc get co/network -o json | jq '.status.conditions[]'

$ oc get co/network -o json | jq '.status.conditions[]'

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Show the ready status of each container in ovnkube-master pods by running the following script:

for p in $(oc get pods --selector app=ovnkube-master -n openshift-ovn-kubernetes \
-o jsonpath='{range.items[*]}{" "}{.metadata.name}'); do echo === $p ===;  \
oc get pods -n openshift-ovn-kubernetes $p -o json | jq '.status.containerStatuses[] | .name, .ready'; \
done

$ for p in $(oc get pods --selector app=ovnkube-master -n openshift-ovn-kubernetes \
-o jsonpath='{range.items[*]}{" "}{.metadata.name}'); do echo === $p ===;  \
oc get pods -n openshift-ovn-kubernetes $p -o json | jq '.status.containerStatuses[] | .name, .ready'; \
done

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Note

The expectation is all container statuses are reporting as true. Failure of a readiness probe sets the status to false.

25.3.2. Viewing OVN-Kubernetes alerts in the console

The Alerting UI provides detailed information about alerts and their governing alerting rules and silences.

Prerequisites

You have access to the cluster as a developer or as a user with view permissions for the project that you are viewing metrics for.

Procedure (UI)

In the Administrator perspective, select Observe → Alerting. The three main pages in the Alerting UI in this perspective are the Alerts, Silences, and Alerting Rules pages.
View the rules for OVN-Kubernetes alerts by selecting Observe → Alerting → Alerting Rules.

25.3.3. Viewing OVN-Kubernetes alerts in the CLI

You can get information about alerts and their governing alerting rules and silences from the command line.

Prerequisites

Access to the cluster as a user with the cluster-admin role.
The OpenShift CLI (oc) installed.
You have installed jq.

Procedure

View active or firing alerts by running the following commands.

Set the alert manager route environment variable by running the following command:

ALERT_MANAGER=$(oc get route alertmanager-main -n openshift-monitoring \
-o jsonpath='{@.spec.host}')

$ ALERT_MANAGER=$(oc get route alertmanager-main -n openshift-monitoring \
-o jsonpath='{@.spec.host}')

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Issue a curl request to the alert manager route API with the correct authorization details requesting specific fields by running the following command:

curl -s -k -H "Authorization: Bearer \
$(oc create token prometheus-k8s -n openshift-monitoring)" \
https://$ALERT_MANAGER/api/v1/alerts \
| jq '.data[] | "\(.labels.severity) \(.labels.alertname) \(.labels.pod) \(.labels.container) \(.labels.endpoint) \(.labels.instance)"'

$ curl -s -k -H "Authorization: Bearer \
$(oc create token prometheus-k8s -n openshift-monitoring)" \
https://$ALERT_MANAGER/api/v1/alerts \
| jq '.data[] | "\(.labels.severity) \(.labels.alertname) \(.labels.pod) \(.labels.container) \(.labels.endpoint) \(.labels.instance)"'

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View alerting rules by running the following command:

oc -n openshift-monitoring exec -c prometheus prometheus-k8s-0 -- curl -s 'http://localhost:9090/api/v1/rules' | jq '.data.groups[].rules[] | select(((.name|contains("ovn")) or (.name|contains("OVN")) or (.name|contains("Ovn")) or (.name|contains("North")) or (.name|contains("South"))) and .type=="alerting")'

$ oc -n openshift-monitoring exec -c prometheus prometheus-k8s-0 -- curl -s 'http://localhost:9090/api/v1/rules' | jq '.data.groups[].rules[] | select(((.name|contains("ovn")) or (.name|contains("OVN")) or (.name|contains("Ovn")) or (.name|contains("North")) or (.name|contains("South"))) and .type=="alerting")'

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25.3.4. Viewing the OVN-Kubernetes logs using the CLI

You can view the logs for each of the pods in the ovnkube-master and ovnkube-node pods using the OpenShift CLI (oc).

Prerequisites

Access to the cluster as a user with the cluster-admin role.
Access to the OpenShift CLI (oc).
You have installed jq.

Procedure

View the log for a specific pod:
```
oc logs -f <pod_name> -c <container_name> -n <namespace>
```
```
$ oc logs -f <pod_name> -c <container_name> -n <namespace>
```
Copy to Clipboard
where:
-f
Optional: Specifies that the output follows what is being written into the logs.
<pod_name>
Specifies the name of the pod.
<container_name>
Optional: Specifies the name of a container. When a pod has more than one container, you must specify the container name.
<namespace>
Specify the namespace the pod is running in.
For example:
```
oc logs ovnkube-master-7h4q7 -n openshift-ovn-kubernetes
```
```
$ oc logs ovnkube-master-7h4q7 -n openshift-ovn-kubernetes
```
Copy to Clipboard
```
oc logs -f ovnkube-master-7h4q7 -n openshift-ovn-kubernetes -c ovn-dbchecker
```
```
$ oc logs -f ovnkube-master-7h4q7 -n openshift-ovn-kubernetes -c ovn-dbchecker
```
Copy to Clipboard
The contents of log files are printed out.

Examine the most recent entries in all the containers in the ovnkube-master pods:

for p in $(oc get pods --selector app=ovnkube-master -n openshift-ovn-kubernetes \
-o jsonpath='{range.items[*]}{" "}{.metadata.name}'); \
do echo === $p ===; for container in $(oc get pods -n openshift-ovn-kubernetes $p \
-o json | jq -r '.status.containerStatuses[] | .name');do echo ---$container---; \
oc logs -c $container $p -n openshift-ovn-kubernetes --tail=5; done; done

$ for p in $(oc get pods --selector app=ovnkube-master -n openshift-ovn-kubernetes \
-o jsonpath='{range.items[*]}{" "}{.metadata.name}'); \
do echo === $p ===; for container in $(oc get pods -n openshift-ovn-kubernetes $p \
-o json | jq -r '.status.containerStatuses[] | .name');do echo ---$container---; \
oc logs -c $container $p -n openshift-ovn-kubernetes --tail=5; done; done

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View the last 5 lines of every log in every container in an ovnkube-master pod using the following command:

oc logs -l app=ovnkube-master -n openshift-ovn-kubernetes --all-containers --tail 5

$ oc logs -l app=ovnkube-master -n openshift-ovn-kubernetes --all-containers --tail 5

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25.3.5. Viewing the OVN-Kubernetes logs using the web console

You can view the logs for each of the pods in the ovnkube-master and ovnkube-node pods in the web console.

Prerequisites

Access to the OpenShift CLI (oc).

Procedure

In the OpenShift Container Platform console, navigate to Workloads → Pods or navigate to the pod through the resource you want to investigate.
Select the openshift-ovn-kubernetes project from the drop-down menu.
Click the name of the pod you want to investigate.
Click Logs. By default for the ovnkube-master the logs associated with the northd container are displayed.
Use the down-down menu to select logs for each container in turn.

25.3.5.1. Changing the OVN-Kubernetes log levels

The default log level for OVN-Kubernetes is 2. To debug OVN-Kubernetes set the log level to 5. Follow this procedure to increase the log level of the OVN-Kubernetes to help you debug an issue.

Prerequisites

You have access to the cluster with cluster-admin privileges.
You have access to the OpenShift Container Platform web console.

Procedure

Run the following command to get detailed information for all pods in the OVN-Kubernetes project:

oc get po -o wide -n openshift-ovn-kubernetes

$ oc get po -o wide -n openshift-ovn-kubernetes

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Example output

NAME                   READY   STATUS    RESTARTS      AGE   IP             NODE                           NOMINATED NODE   READINESS GATES
ovnkube-master-84nc9   6/6     Running   0             50m   10.0.134.156   ip-10-0-134-156.ec2.internal   <none>           <none>
ovnkube-master-gmlqv   6/6     Running   0             50m   10.0.209.180   ip-10-0-209-180.ec2.internal   <none>           <none>
ovnkube-master-nhts2   6/6     Running   1 (48m ago)   50m   10.0.147.31    ip-10-0-147-31.ec2.internal    <none>           <none>
ovnkube-node-2cbh8     5/5     Running   0             43m   10.0.217.114   ip-10-0-217-114.ec2.internal   <none>           <none>
ovnkube-node-6fvzl     5/5     Running   0             50m   10.0.147.31    ip-10-0-147-31.ec2.internal    <none>           <none>
ovnkube-node-f4lzz     5/5     Running   0             24m   10.0.146.76    ip-10-0-146-76.ec2.internal    <none>           <none>
ovnkube-node-jf67d     5/5     Running   0             50m   10.0.209.180   ip-10-0-209-180.ec2.internal   <none>           <none>
ovnkube-node-np9mf     5/5     Running   0             40m   10.0.165.191   ip-10-0-165-191.ec2.internal   <none>           <none>
ovnkube-node-qjldg     5/5     Running   0             50m   10.0.134.156   ip-10-0-134-156.ec2.internal   <none>           <none>

NAME                   READY   STATUS    RESTARTS      AGE   IP             NODE                           NOMINATED NODE   READINESS GATES
ovnkube-master-84nc9   6/6     Running   0             50m   10.0.134.156   ip-10-0-134-156.ec2.internal   <none>           <none>
ovnkube-master-gmlqv   6/6     Running   0             50m   10.0.209.180   ip-10-0-209-180.ec2.internal   <none>           <none>
ovnkube-master-nhts2   6/6     Running   1 (48m ago)   50m   10.0.147.31    ip-10-0-147-31.ec2.internal    <none>           <none>
ovnkube-node-2cbh8     5/5     Running   0             43m   10.0.217.114   ip-10-0-217-114.ec2.internal   <none>           <none>
ovnkube-node-6fvzl     5/5     Running   0             50m   10.0.147.31    ip-10-0-147-31.ec2.internal    <none>           <none>
ovnkube-node-f4lzz     5/5     Running   0             24m   10.0.146.76    ip-10-0-146-76.ec2.internal    <none>           <none>
ovnkube-node-jf67d     5/5     Running   0             50m   10.0.209.180   ip-10-0-209-180.ec2.internal   <none>           <none>
ovnkube-node-np9mf     5/5     Running   0             40m   10.0.165.191   ip-10-0-165-191.ec2.internal   <none>           <none>
ovnkube-node-qjldg     5/5     Running   0             50m   10.0.134.156   ip-10-0-134-156.ec2.internal   <none>           <none>

Copy to Clipboard

Create a ConfigMap file similar to the following example and use a filename such as env-overrides.yaml:

Example ConfigMap file

kind: ConfigMap
apiVersion: v1
metadata:
  name: env-overrides
  namespace: openshift-ovn-kubernetes
data:
  ip-10-0-217-114.ec2.internal: | 
    # This sets the log level for the ovn-kubernetes node process:
    OVN_KUBE_LOG_LEVEL=5
    # You might also/instead want to enable debug logging for ovn-controller:
    OVN_LOG_LEVEL=dbg
  ip-10-0-209-180.ec2.internal: |
    # This sets the log level for the ovn-kubernetes node process:
    OVN_KUBE_LOG_LEVEL=5
    # You might also/instead want to enable debug logging for ovn-controller:
    OVN_LOG_LEVEL=dbg
  _master: | 
    # This sets the log level for the ovn-kubernetes master process as well as the ovn-dbchecker:
    OVN_KUBE_LOG_LEVEL=5
    # You might also/instead want to enable debug logging for northd, nbdb and sbdb on all masters:
    OVN_LOG_LEVEL=dbg

kind: ConfigMap
apiVersion: v1
metadata:
  name: env-overrides
  namespace: openshift-ovn-kubernetes
data:
  ip-10-0-217-114.ec2.internal: |

1


    # This sets the log level for the ovn-kubernetes node process:
    OVN_KUBE_LOG_LEVEL=5
    # You might also/instead want to enable debug logging for ovn-controller:
    OVN_LOG_LEVEL=dbg
  ip-10-0-209-180.ec2.internal: |
    # This sets the log level for the ovn-kubernetes node process:
    OVN_KUBE_LOG_LEVEL=5
    # You might also/instead want to enable debug logging for ovn-controller:
    OVN_LOG_LEVEL=dbg
  _master: |

2


    # This sets the log level for the ovn-kubernetes master process as well as the ovn-dbchecker:
    OVN_KUBE_LOG_LEVEL=5
    # You might also/instead want to enable debug logging for northd, nbdb and sbdb on all masters:
    OVN_LOG_LEVEL=dbg

Copy to Clipboard

1: Specify the name of the node you want to set the debug log level on.
2: Specify _master to set the log levels of ovnkube-master components.

Apply the ConfigMap file by using the following command:

oc apply -n openshift-ovn-kubernetes -f env-overrides.yaml

$ oc apply -n openshift-ovn-kubernetes -f env-overrides.yaml

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Example output

configmap/env-overrides.yaml created

configmap/env-overrides.yaml created

Copy to Clipboard

Restart the ovnkube pods to apply the new log level by using the following commands:

oc delete pod -n openshift-ovn-kubernetes \
--field-selector spec.nodeName=ip-10-0-217-114.ec2.internal -l app=ovnkube-node

$ oc delete pod -n openshift-ovn-kubernetes \
--field-selector spec.nodeName=ip-10-0-217-114.ec2.internal -l app=ovnkube-node

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oc delete pod -n openshift-ovn-kubernetes \
--field-selector spec.nodeName=ip-10-0-209-180.ec2.internal -l app=ovnkube-node

$ oc delete pod -n openshift-ovn-kubernetes \
--field-selector spec.nodeName=ip-10-0-209-180.ec2.internal -l app=ovnkube-node

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oc delete pod -n openshift-ovn-kubernetes -l app=ovnkube-master

$ oc delete pod -n openshift-ovn-kubernetes -l app=ovnkube-master

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25.3.6. Checking the OVN-Kubernetes pod network connectivity

The connectivity check controller, in OpenShift Container Platform 4.10 and later, orchestrates connection verification checks in your cluster. These include Kubernetes API, OpenShift API and individual nodes. The results for the connection tests are stored in PodNetworkConnectivity objects in the openshift-network-diagnostics namespace. Connection tests are performed every minute in parallel.

Prerequisites

Access to the OpenShift CLI (oc).
Access to the cluster as a user with the cluster-admin role.
You have installed jq.

Procedure

To list the current PodNetworkConnectivityCheck objects, enter the following command:

oc get podnetworkconnectivitychecks -n openshift-network-diagnostics

$ oc get podnetworkconnectivitychecks -n openshift-network-diagnostics

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View the most recent success for each connection object by using the following command:

oc get podnetworkconnectivitychecks -n openshift-network-diagnostics \
-o json | jq '.items[]| .spec.targetEndpoint,.status.successes[0]'

$ oc get podnetworkconnectivitychecks -n openshift-network-diagnostics \
-o json | jq '.items[]| .spec.targetEndpoint,.status.successes[0]'

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View the most recent failures for each connection object by using the following command:

oc get podnetworkconnectivitychecks -n openshift-network-diagnostics \
-o json | jq '.items[]| .spec.targetEndpoint,.status.failures[0]'

$ oc get podnetworkconnectivitychecks -n openshift-network-diagnostics \
-o json | jq '.items[]| .spec.targetEndpoint,.status.failures[0]'

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View the most recent outages for each connection object by using the following command:

oc get podnetworkconnectivitychecks -n openshift-network-diagnostics \
-o json | jq '.items[]| .spec.targetEndpoint,.status.outages[0]'

$ oc get podnetworkconnectivitychecks -n openshift-network-diagnostics \
-o json | jq '.items[]| .spec.targetEndpoint,.status.outages[0]'

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The connectivity check controller also logs metrics from these checks into Prometheus.

View all the metrics by running the following command:

oc exec prometheus-k8s-0 -n openshift-monitoring -- \
promtool query instant  http://localhost:9090 \
'{component="openshift-network-diagnostics"}'

$ oc exec prometheus-k8s-0 -n openshift-monitoring -- \
promtool query instant  http://localhost:9090 \
'{component="openshift-network-diagnostics"}'

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View the latency between the source pod and the openshift api service for the last 5 minutes:

oc exec prometheus-k8s-0 -n openshift-monitoring -- \
promtool query instant  http://localhost:9090 \
'{component="openshift-network-diagnostics"}'

$ oc exec prometheus-k8s-0 -n openshift-monitoring -- \
promtool query instant  http://localhost:9090 \
'{component="openshift-network-diagnostics"}'

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25.4. Tracing Openflow with ovnkube-trace

OVN and OVS traffic flows can be simulated in a single utility called ovnkube-trace. The ovnkube-trace utility runs ovn-trace, ovs-appctl ofproto/trace and ovn-detrace and correlates that information in a single output.

You can execute the ovnkube-trace binary from a dedicated container. For releases after OpenShift Container Platform 4.7, you can also copy the binary to a local host and execute it from that host.

Note

The binaries in the Quay images do not currently work for Dual IP stack or IPv6 only environments. For those environments, you must build from source.

25.4.1. Installing the ovnkube-trace on local host

The ovnkube-trace tool traces packet simulations for arbitrary UDP or TCP traffic between points in an OVN-Kubernetes driven OpenShift Container Platform cluster. Copy the ovnkube-trace binary to your local host making it available to run against the cluster.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.

Procedure

Create a pod variable by using the following command:

 POD=$(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-master -o name | head -1 | awk -F '/' '{print $NF}')

$  POD=$(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-master -o name | head -1 | awk -F '/' '{print $NF}')

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Run the following command on your local host to copy the binary from the ovnkube-master pods:

 oc cp -n openshift-ovn-kubernetes $POD:/usr/bin/ovnkube-trace ovnkube-trace

$  oc cp -n openshift-ovn-kubernetes $POD:/usr/bin/ovnkube-trace ovnkube-trace

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Make ovnkube-trace executable by running the following command:
```
 chmod +x ovnkube-trace
```
```
$  chmod +x ovnkube-trace
```
Copy to Clipboard

Display the options available with ovnkube-trace by running the following command:

 ./ovnkube-trace -help

$  ./ovnkube-trace -help

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Expected output

I0111 15:05:27.973305  204872 ovs.go:90] Maximum command line arguments set to: 191102
Usage of ./ovnkube-trace:
  -dst string
    	dest: destination pod name
  -dst-ip string
    	destination IP address (meant for tests to external targets)
  -dst-namespace string
    	k8s namespace of dest pod (default "default")
  -dst-port string
    	dst-port: destination port (default "80")
  -kubeconfig string
    	absolute path to the kubeconfig file
  -loglevel string
    	loglevel: klog level (default "0")
  -ovn-config-namespace string
    	namespace used by ovn-config itself
  -service string
    	service: destination service name
  -skip-detrace
    	skip ovn-detrace command
  -src string
    	src: source pod name
  -src-namespace string
    	k8s namespace of source pod (default "default")
  -tcp
    	use tcp transport protocol
  -udp
    	use udp transport protocol

I0111 15:05:27.973305  204872 ovs.go:90] Maximum command line arguments set to: 191102
Usage of ./ovnkube-trace:
  -dst string
    	dest: destination pod name
  -dst-ip string
    	destination IP address (meant for tests to external targets)
  -dst-namespace string
    	k8s namespace of dest pod (default "default")
  -dst-port string
    	dst-port: destination port (default "80")
  -kubeconfig string
    	absolute path to the kubeconfig file
  -loglevel string
    	loglevel: klog level (default "0")
  -ovn-config-namespace string
    	namespace used by ovn-config itself
  -service string
    	service: destination service name
  -skip-detrace
    	skip ovn-detrace command
  -src string
    	src: source pod name
  -src-namespace string
    	k8s namespace of source pod (default "default")
  -tcp
    	use tcp transport protocol
  -udp
    	use udp transport protocol

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The command-line arguments supported are familiar Kubernetes constructs, such as namespaces, pods, services so you do not need to find the MAC address, the IP address of the destination nodes, or the ICMP type.

The log levels are:

0 (minimal output)
2 (more verbose output showing results of trace commands)
5 (debug output)

25.4.2. Running ovnkube-trace

Run ovn-trace to simulate packet forwarding within an OVN logical network.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You have installed ovnkube-trace on local host

Example: Testing that DNS resolution works from a deployed pod

This example illustrates how to test the DNS resolution from a deployed pod to the core DNS pod that runs in the cluster.

Procedure

Start a web service in the default namespace by entering the following command:

oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

$ oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

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List the pods running in the openshift-dns namespace:

oc get pods -n openshift-dns

oc get pods -n openshift-dns

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Example output

NAME                  READY   STATUS    RESTARTS   AGE
dns-default-467qw     2/2     Running   0          49m
dns-default-6prvx     2/2     Running   0          53m
dns-default-fkqr8     2/2     Running   0          53m
dns-default-qv2rg     2/2     Running   0          49m
dns-default-s29vr     2/2     Running   0          49m
dns-default-vdsbn     2/2     Running   0          53m
node-resolver-6thtt   1/1     Running   0          53m
node-resolver-7ksdn   1/1     Running   0          49m
node-resolver-8sthh   1/1     Running   0          53m
node-resolver-c5ksw   1/1     Running   0          50m
node-resolver-gbvdp   1/1     Running   0          53m
node-resolver-sxhkd   1/1     Running   0          50m

NAME                  READY   STATUS    RESTARTS   AGE
dns-default-467qw     2/2     Running   0          49m
dns-default-6prvx     2/2     Running   0          53m
dns-default-fkqr8     2/2     Running   0          53m
dns-default-qv2rg     2/2     Running   0          49m
dns-default-s29vr     2/2     Running   0          49m
dns-default-vdsbn     2/2     Running   0          53m
node-resolver-6thtt   1/1     Running   0          53m
node-resolver-7ksdn   1/1     Running   0          49m
node-resolver-8sthh   1/1     Running   0          53m
node-resolver-c5ksw   1/1     Running   0          50m
node-resolver-gbvdp   1/1     Running   0          53m
node-resolver-sxhkd   1/1     Running   0          50m

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Run the following ovn-kube-trace command to verify DNS resolution is working:

./ovnkube-trace \
  -src-namespace default \
  -src web \
  -dst-namespace openshift-dns \
  -dst dns-default-467qw \
  -udp -dst-port 53 \
  -loglevel 0

$ ./ovnkube-trace \
  -src-namespace default \

1


  -src web \

2


  -dst-namespace openshift-dns \

3


  -dst dns-default-467qw \

4


  -udp -dst-port 53 \

5


  -loglevel 0

6

Copy to Clipboard

1: Namespace of the source pod
2: Source pod name
3: Namespace of destination pod
4: Destination pod name
5: Use the udp transport protocol. Port 53 is the port the DNS service uses.
6: Set the log level to 1 (0 is minimal and 5 is debug)

Expected output

I0116 10:19:35.601303   17900 ovs.go:90] Maximum command line arguments set to: 191102
ovn-trace source pod to destination pod indicates success from web to dns-default-467qw
ovn-trace destination pod to source pod indicates success from dns-default-467qw to web
ovs-appctl ofproto/trace source pod to destination pod indicates success from web to dns-default-467qw
ovs-appctl ofproto/trace destination pod to source pod indicates success from dns-default-467qw to web
ovn-detrace source pod to destination pod indicates success from web to dns-default-467qw
ovn-detrace destination pod to source pod indicates success from dns-default-467qw to web

I0116 10:19:35.601303   17900 ovs.go:90] Maximum command line arguments set to: 191102
ovn-trace source pod to destination pod indicates success from web to dns-default-467qw
ovn-trace destination pod to source pod indicates success from dns-default-467qw to web
ovs-appctl ofproto/trace source pod to destination pod indicates success from web to dns-default-467qw
ovs-appctl ofproto/trace destination pod to source pod indicates success from dns-default-467qw to web
ovn-detrace source pod to destination pod indicates success from web to dns-default-467qw
ovn-detrace destination pod to source pod indicates success from dns-default-467qw to web

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The ouput indicates success from the deployed pod to the DNS port and also indicates that it is successful going back in the other direction. So you know bi-directional traffic is supported on UDP port 53 if my web pod wants to do dns resolution from core DNS.

If for example that did not work and you wanted to get the ovn-trace, the ovs-appctl ofproto/trace and ovn-detrace, and more debug type information increase the log level to 2 and run the command again as follows:

./ovnkube-trace \
  -src-namespace default \
  -src web \
  -dst-namespace openshift-dns \
  -dst dns-default-467qw \
  -udp -dst-port 53 \
  -loglevel 2

$ ./ovnkube-trace \
  -src-namespace default \
  -src web \
  -dst-namespace openshift-dns \
  -dst dns-default-467qw \
  -udp -dst-port 53 \
  -loglevel 2

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The output from this increased log level is too much to list here. In a failure situation the output of this command shows which flow is dropping that traffic. For example an egress or ingress network policy may be configured on the cluster that does not allow that traffic.

Example: Verifying by using debug output a configured default deny

This example illustrates how to identify by using the debug output that an ingress default deny policy blocks traffic.

Procedure

Create the following YAML that defines a deny-by-default policy to deny ingress from all pods in all namespaces. Save the YAML in the deny-by-default.yaml file:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: deny-by-default
  namespace: default
spec:
  podSelector: {}
  ingress: []

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: deny-by-default
  namespace: default
spec:
  podSelector: {}
  ingress: []

Copy to Clipboard

Apply the policy by entering the following command:

oc apply -f deny-by-default.yaml

$ oc apply -f deny-by-default.yaml

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Example output

networkpolicy.networking.k8s.io/deny-by-default created

networkpolicy.networking.k8s.io/deny-by-default created

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Start a web service in the default namespace by entering the following command:

oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

$ oc run web --namespace=default --image=nginx --labels="app=web" --expose --port=80

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Run the following command to create the prod namespace:
```
oc create namespace prod
```
```
$ oc create namespace prod
```
Copy to Clipboard

Run the following command to label the prod namespace:

oc label namespace/prod purpose=production

$ oc label namespace/prod purpose=production

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Run the following command to deploy an alpine image in the prod namespace and start a shell:

oc run test-6459 --namespace=prod --rm -i -t --image=alpine -- sh

$ oc run test-6459 --namespace=prod --rm -i -t --image=alpine -- sh

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Open another terminal session.

In this new terminal session run ovn-trace to verify the failure in communication between the source pod test-6459 running in namespace prod and destination pod running in the default namespace:

./ovnkube-trace \
 -src-namespace prod \
 -src test-6459 \
 -dst-namespace default \
 -dst web \
 -tcp -dst-port 80 \
 -loglevel 0

$ ./ovnkube-trace \
 -src-namespace prod \
 -src test-6459 \
 -dst-namespace default \
 -dst web \
 -tcp -dst-port 80 \
 -loglevel 0

Copy to Clipboard

Expected output

I0116 14:20:47.380775   50822 ovs.go:90] Maximum command line arguments set to: 191102
ovn-trace source pod to destination pod indicates failure from test-6459 to web

I0116 14:20:47.380775   50822 ovs.go:90] Maximum command line arguments set to: 191102
ovn-trace source pod to destination pod indicates failure from test-6459 to web

Copy to Clipboard

Increase the log level to 2 to expose the reason for the failure by running the following command:

./ovnkube-trace \
 -src-namespace prod \
 -src test-6459 \
 -dst-namespace default \
 -dst web \
 -tcp -dst-port 80 \
 -loglevel 2

$ ./ovnkube-trace \
 -src-namespace prod \
 -src test-6459 \
 -dst-namespace default \
 -dst web \
 -tcp -dst-port 80 \
 -loglevel 2

Copy to Clipboard

Expected output

ct_lb_mark /* default (use --ct to customize) */
------------------------------------------------
 3. ls_out_acl_hint (northd.c:6092): !ct.new && ct.est && !ct.rpl && ct_mark.blocked == 0, priority 4, uuid 32d45ad4
    reg0[8] = 1;
    reg0[10] = 1;
    next;
 4. ls_out_acl (northd.c:6435): reg0[10] == 1 && (outport == @a16982411286042166782_ingressDefaultDeny), priority 2000, uuid f730a887 
    ct_commit { ct_mark.blocked = 1; };

ct_lb_mark /* default (use --ct to customize) */
------------------------------------------------
 3. ls_out_acl_hint (northd.c:6092): !ct.new && ct.est && !ct.rpl && ct_mark.blocked == 0, priority 4, uuid 32d45ad4
    reg0[8] = 1;
    reg0[10] = 1;
    next;
 4. ls_out_acl (northd.c:6435): reg0[10] == 1 && (outport == @a16982411286042166782_ingressDefaultDeny), priority 2000, uuid f730a887

1


    ct_commit { ct_mark.blocked = 1; };

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1: Ingress traffic is blocked due to the default deny policy being in place

Create a policy that allows traffic from all pods in a particular namespaces with a label purpose=production. Save the YAML in the web-allow-prod.yaml file:

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: web-allow-prod
  namespace: default
spec:
  podSelector:
    matchLabels:
      app: web
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          purpose: production

kind: NetworkPolicy
apiVersion: networking.k8s.io/v1
metadata:
  name: web-allow-prod
  namespace: default
spec:
  podSelector:
    matchLabels:
      app: web
  policyTypes:
  - Ingress
  ingress:
  - from:
    - namespaceSelector:
        matchLabels:
          purpose: production

Copy to Clipboard

Apply the policy by entering the following command:
```
oc apply -f web-allow-prod.yaml
```
```
$ oc apply -f web-allow-prod.yaml
```
Copy to Clipboard

Run ovnkube-trace to verify that traffic is now allowed by entering the following command:

./ovnkube-trace \
 -src-namespace prod \
 -src test-6459 \
 -dst-namespace default \
 -dst web \
 -tcp -dst-port 80 \
 -loglevel 0

$ ./ovnkube-trace \
 -src-namespace prod \
 -src test-6459 \
 -dst-namespace default \
 -dst web \
 -tcp -dst-port 80 \
 -loglevel 0

Copy to Clipboard

Expected output

I0116 14:25:44.055207   51695 ovs.go:90] Maximum command line arguments set to: 191102
ovn-trace source pod to destination pod indicates success from test-6459 to web
ovn-trace destination pod to source pod indicates success from web to test-6459
ovs-appctl ofproto/trace source pod to destination pod indicates success from test-6459 to web
ovs-appctl ofproto/trace destination pod to source pod indicates success from web to test-6459
ovn-detrace source pod to destination pod indicates success from test-6459 to web
ovn-detrace destination pod to source pod indicates success from web to test-6459

I0116 14:25:44.055207   51695 ovs.go:90] Maximum command line arguments set to: 191102
ovn-trace source pod to destination pod indicates success from test-6459 to web
ovn-trace destination pod to source pod indicates success from web to test-6459
ovs-appctl ofproto/trace source pod to destination pod indicates success from test-6459 to web
ovs-appctl ofproto/trace destination pod to source pod indicates success from web to test-6459
ovn-detrace source pod to destination pod indicates success from test-6459 to web
ovn-detrace destination pod to source pod indicates success from web to test-6459

Copy to Clipboard

In the open shell run the following command:

 wget -qO- --timeout=2 http://web.default

 wget -qO- --timeout=2 http://web.default

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Expected output

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

Copy to Clipboard

25.5. Migrating from the OpenShift SDN network plugin

As a cluster administrator, you can migrate to the OVN-Kubernetes network plugin from the OpenShift SDN network plugin.

You can use the offline migration method for migrating from the OpenShift SDN network plugin to the OVN-Kubernetes plugin. The offline migration method is a manual process that includes some downtime.

25.5.1. Migration to the OVN-Kubernetes network plugin

Migrating to the OVN-Kubernetes network plugin is a manual process that includes some downtime during which your cluster is unreachable.

Important

Before you migrate your OpenShift Container Platform cluster to use the OVN-Kubernetes network plugin, update your cluster to the latest z-stream release so that all the latest bug fixes apply to your cluster.

Although a rollback procedure is provided, the migration is intended to be a one-way process.

A migration to the OVN-Kubernetes network plugin is supported on the following platforms:

Bare metal hardware
Amazon Web Services (AWS)
Google Cloud Platform (GCP)
IBM Cloud®
Microsoft Azure
Red Hat OpenStack Platform (RHOSP)
Red Hat Virtualization (RHV)
{vmw-first}

Important

Migrating to or from the OVN-Kubernetes network plugin is not supported for managed OpenShift cloud services such as Red Hat OpenShift Dedicated, Azure Red Hat OpenShift(ARO), and Red Hat OpenShift Service on AWS (ROSA).

Migrating from OpenShift SDN network plugin to OVN-Kubernetes network plugin is not supported on Nutanix.

25.5.1.1. Considerations for migrating to the OVN-Kubernetes network plugin

If you have more than 150 nodes in your OpenShift Container Platform cluster, then open a support case for consultation on your migration to the OVN-Kubernetes network plugin.

The subnets assigned to nodes and the IP addresses assigned to individual pods are not preserved during the migration.

While the OVN-Kubernetes network plugin implements many of the capabilities present in the OpenShift SDN network plugin, the configuration is not the same.

If your cluster uses any of the following OpenShift SDN network plugin capabilities, you must manually configure the same capability in the OVN-Kubernetes network plugin:
- Namespace isolation
- Egress router pods
If your cluster or surrounding network uses any part of the 100.64.0.0/16 address range, you must choose another unused IP range by specifying the v4InternalSubnet spec under the spec.defaultNetwork.ovnKubernetesConfig object definition. OVN-Kubernetes uses the IP range 100.64.0.0/16 internally by default.
If your openshift-sdn cluster with Precision Time Protocol (PTP) uses the User Datagram Protocol (UDP) for hardware time stamping and you migrate to the OVN-Kubernetes plugin, the hardware time stamping cannot be applied to primary interface devices, such as an Open vSwitch (OVS) bridge. As a result, UDP version 4 configurations cannot work with a br-ex interface.

The following sections highlight the differences in configuration between the aforementioned capabilities in OVN-Kubernetes and OpenShift SDN network plugins.

Primary network interface

The OpenShift SDN plugin allows application of the NodeNetworkConfigurationPolicy (NNCP) custom resource (CR) to the primary interface on a node. The OVN-Kubernetes network plugin does not have this capability.

If you have an NNCP applied to the primary interface, you must delete the NNCP before migrating to the OVN-Kubernetes network plugin. Deleting the NNCP does not remove the configuration from the primary interface, but with OVN-Kubernetes, the Kubernetes NMState cannot manage this configuration. Instead, the configure-ovs.sh shell script manages the primary interface and the configuration attached to this interface.

Namespace isolation

OVN-Kubernetes supports only the network policy isolation mode.

Important

For a cluster using OpenShift SDN that is configured in either the multitenant or subnet isolation mode, you can still migrate to the OVN-Kubernetes network plugin. Note that after the migration operation, multitenant isolation mode is dropped, so you must manually configure network policies to achieve the same level of project-level isolation for pods and services.

Egress IP addresses

OpenShift SDN supports two different Egress IP modes:

In the automatically assigned approach, an egress IP address range is assigned to a node.
In the manually assigned approach, a list of one or more egress IP addresses is assigned to a node.

The migration process supports migrating Egress IP configurations that use the automatically assigned mode.

The differences in configuring an egress IP address between OVN-Kubernetes and OpenShift SDN is described in the following table:

Table 25.4. Differences in egress IP address configuration
OVN-Kubernetes	OpenShift SDN
Create an `EgressIPs` object Add an annotation on a `Node` object	Patch a `NetNamespace` object Patch a `HostSubnet` object

For more information on using egress IP addresses in OVN-Kubernetes, see "Configuring an egress IP address".

Egress network policies

The difference in configuring an egress network policy, also known as an egress firewall, between OVN-Kubernetes and OpenShift SDN is described in the following table:

Table 25.5. Differences in egress network policy configuration
OVN-Kubernetes	OpenShift SDN
Create an `EgressFirewall` object in a namespace	Create an `EgressNetworkPolicy` object in a namespace

Note

Because the name of an EgressFirewall object can only be set to default, after the migration all migrated EgressNetworkPolicy objects are named default, regardless of what the name was under OpenShift SDN.

If you subsequently rollback to OpenShift SDN, all EgressNetworkPolicy objects are named default as the prior name is lost.

For more information on using an egress firewall in OVN-Kubernetes, see "Configuring an egress firewall for a project".

Egress router pods

OVN-Kubernetes supports egress router pods in redirect mode. OVN-Kubernetes does not support egress router pods in HTTP proxy mode or DNS proxy mode.

When you deploy an egress router with the Cluster Network Operator, you cannot specify a node selector to control which node is used to host the egress router pod.

Multicast

The difference between enabling multicast traffic on OVN-Kubernetes and OpenShift SDN is described in the following table:

Table 25.6. Differences in multicast configuration
OVN-Kubernetes	OpenShift SDN
Add an annotation on a `Namespace` object	Add an annotation on a `NetNamespace` object

For more information on using multicast in OVN-Kubernetes, see "Enabling multicast for a project".

Network policies

OVN-Kubernetes fully supports the Kubernetes NetworkPolicy API in the networking.k8s.io/v1 API group. No changes are necessary in your network policies when migrating from OpenShift SDN.

25.5.1.2. How the migration process works

The following table summarizes the migration process by segmenting between the user-initiated steps in the process and the actions that the migration performs in response.

Table 25.7. Migrating to OVN-Kubernetes from OpenShift SDN
User-initiated steps	Migration activity
Set the `migration` field of the `Network.operator.openshift.io` custom resource (CR) named `cluster` to `OVNKubernetes`. Make sure the `migration` field is `null` before setting it to a value.	Cluster Network Operator (CNO) Updates the status of the `Network.config.openshift.io` CR named `cluster` accordingly. Machine Config Operator (MCO) Rolls out an update to the systemd configuration necessary for OVN-Kubernetes; the MCO updates a single machine per pool at a time by default, causing the total time the migration takes to increase with the size of the cluster.
Update the `networkType` field of the `Network.config.openshift.io` CR.	CNO Performs the following actions: Destroys the OpenShift SDN control plane pods. Deploys the OVN-Kubernetes control plane pods. Updates the Multus objects to reflect the new network plugin.
Reboot each node in the cluster.	Cluster As nodes reboot, the cluster assigns IP addresses to pods on the OVN-Kubernetes cluster network.

If a rollback to OpenShift SDN is required, the following table describes the process.

Important

You must wait until the migration process from OpenShift SDN to OVN-Kubernetes network plugin is successful before initiating a rollback.

Table 25.8. Performing a rollback to OpenShift SDN
User-initiated steps	Migration activity
Suspend the MCO to ensure that it does not interrupt the migration.	The MCO stops.
Set the `migration` field of the `Network.operator.openshift.io` custom resource (CR) named `cluster` to `OpenShiftSDN`. Make sure the `migration` field is `null` before setting it to a value.	CNO Updates the status of the `Network.config.openshift.io` CR named `cluster` accordingly.
Update the `networkType` field.	CNO Performs the following actions: Destroys the OVN-Kubernetes control plane pods. Deploys the OpenShift SDN control plane pods. Updates the Multus objects to reflect the new network plugin.
Reboot each node in the cluster.	Cluster As nodes reboot, the cluster assigns IP addresses to pods on the OpenShift-SDN network.
Enable the MCO after all nodes in the cluster reboot.	MCO Rolls out an update to the systemd configuration necessary for OpenShift SDN; the MCO updates a single machine per pool at a time by default, so the total time the migration takes increases with the size of the cluster.

25.5.2. Migrating to the OVN-Kubernetes network plugin

As a cluster administrator, you can change the network plugin for your cluster to OVN-Kubernetes. During the migration, you must reboot every node in your cluster.

Important

While performing the migration, your cluster is unavailable and workloads might be interrupted. Perform the migration only when an interruption in service is acceptable.

Prerequisites

You have a cluster configured with the OpenShift SDN CNI network plugin in the network policy isolation mode.
You installed the OpenShift CLI (oc).
You have access to the cluster as a user with the cluster-admin role.
You have a recent backup of the etcd database.
You can manually reboot each node.
You checked that your cluster is in a known good state without any errors.
You created a security group rule that allows User Datagram Protocol (UDP) packets on port 6081 for all nodes on all cloud platforms.

Procedure

To backup the configuration for the cluster network, enter the following command:

oc get Network.config.openshift.io cluster -o yaml > cluster-openshift-sdn.yaml

$ oc get Network.config.openshift.io cluster -o yaml > cluster-openshift-sdn.yaml

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Verify that the OVN_SDN_MIGRATION_TIMEOUT environment variable is set and is equal to 0s by running the following command:

#!/bin/bash

if [ -n "$OVN_SDN_MIGRATION_TIMEOUT" ] && [ "$OVN_SDN_MIGRATION_TIMEOUT" = "0s" ]; then
    unset OVN_SDN_MIGRATION_TIMEOUT
fi

#loops the timeout command of the script to repeatedly check the cluster Operators until all are available.

co_timeout=${OVN_SDN_MIGRATION_TIMEOUT:-1200s}
timeout "$co_timeout" bash <<EOT
until
  oc wait co --all --for='condition=AVAILABLE=True' --timeout=10s && \
  oc wait co --all --for='condition=PROGRESSING=False' --timeout=10s && \
  oc wait co --all --for='condition=DEGRADED=False' --timeout=10s;
do
  sleep 10
  echo "Some ClusterOperators Degraded=False,Progressing=True,or Available=False";
done
EOT

#!/bin/bash

if [ -n "$OVN_SDN_MIGRATION_TIMEOUT" ] && [ "$OVN_SDN_MIGRATION_TIMEOUT" = "0s" ]; then
    unset OVN_SDN_MIGRATION_TIMEOUT
fi

#loops the timeout command of the script to repeatedly check the cluster Operators until all are available.

co_timeout=${OVN_SDN_MIGRATION_TIMEOUT:-1200s}
timeout "$co_timeout" bash <<EOT
until
  oc wait co --all --for='condition=AVAILABLE=True' --timeout=10s && \
  oc wait co --all --for='condition=PROGRESSING=False' --timeout=10s && \
  oc wait co --all --for='condition=DEGRADED=False' --timeout=10s;
do
  sleep 10
  echo "Some ClusterOperators Degraded=False,Progressing=True,or Available=False";
done
EOT

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Remove the configuration from the Cluster Network Operator (CNO) configuration object by running the following command:

oc patch Network.operator.openshift.io cluster --type='merge' \
--patch '{"spec":{"migration":null}}'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
--patch '{"spec":{"migration":null}}'

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Delete the NodeNetworkConfigurationPolicy (NNCP) custom resource (CR) that defines the primary network interface for the OpenShift SDN network plugin by completing the following steps:
1. Check that the existing NNCP CR bonded the primary interface to your cluster by entering the following command:
  $ oc get nncp
  Copy to Clipboard
  Example output
  NAME STATUS REASON bondmaster0 Available SuccessfullyConfigured
  
  Copy to Clipboard
  Network Manager stores the connection profile for the bonded primary interface in the /etc/NetworkManager/system-connections system path.
2. Remove the NNCP from your cluster:
  $ oc delete nncp <nncp_manifest_filename>
  Copy to Clipboard
To prepare all the nodes for the migration, set the migration field on the CNO configuration object by running the following command:
```
oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OVNKubernetes" } } }'
```
```
$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OVNKubernetes" } } }'
```
Copy to Clipboard
Note
This step does not deploy OVN-Kubernetes immediately. Instead, specifying the migration field triggers the Machine Config Operator (MCO) to apply new machine configs to all the nodes in the cluster in preparation for the OVN-Kubernetes deployment.
1. Check that the reboot is finished by running the following command:
  $ oc get mcp
  Copy to Clipboard
2. Check that all cluster Operators are available by running the following command:
  $ oc get co
  Copy to Clipboard
3. Alternatively: You can disable automatic migration of several OpenShift SDN capabilities to the OVN-Kubernetes equivalents:
  - Egress IPs
  - Egress firewall
  - Multicast
  To disable automatic migration of the configuration for any of the previously noted OpenShift SDN features, specify the following keys:
  $ oc patch Network.operator.openshift.io cluster --type='merge' \ --patch '{ "spec": { "migration": { "networkType": "OVNKubernetes", "features": { "egressIP": <bool>, "egressFirewall": <bool>, "multicast": <bool> } } } }'
  Copy to Clipboard
  where:
  bool: Specifies whether to enable migration of the feature. The default is true.
Optional: You can customize the following settings for OVN-Kubernetes to meet your network infrastructure requirements:
- Maximum transmission unit (MTU). Consider the following before customizing the MTU for this optional step:
  - If you use the default MTU, and you want to keep the default MTU during migration, this step can be ignored.
  - If you used a custom MTU, and you want to keep the custom MTU during migration, you must declare the custom MTU value in this step.
  - This step does not work if you want to change the MTU value during migration. Instead, you must first follow the instructions for "Changing the cluster MTU". You can then keep the custom MTU value by performing this procedure and declaring the custom MTU value in this step.
    Note
    OpenShift-SDN and OVN-Kubernetes have different overlay overhead. MTU values should be selected by following the guidelines found on the "MTU value selection" page.
- Geneve (Generic Network Virtualization Encapsulation) overlay network port
- OVN-Kubernetes IPv4 internal subnet
To customize either of the previously noted settings, enter and customize the following command. If you do not need to change the default value, omit the key from the patch.
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "ovnKubernetesConfig":{
          "mtu":<mtu>,
          "genevePort":<port>,
          "v4InternalSubnet":"<ipv4_subnet>"
    }}}}'
```
Copy to Clipboard
where:
mtu
The MTU for the Geneve overlay network. This value is normally configured automatically, but if the nodes in your cluster do not all use the same MTU, then you must set this explicitly to 100 less than the smallest node MTU value.
port
The UDP port for the Geneve overlay network. If a value is not specified, the default is 6081. The port cannot be the same as the VXLAN port that is used by OpenShift SDN. The default value for the VXLAN port is 4789.
ipv4_subnet
An IPv4 address range for internal use by OVN-Kubernetes. You must ensure that the IP address range does not overlap with any other subnet used by your OpenShift Container Platform installation. The IP address range must be larger than the maximum number of nodes that can be added to the cluster. The default value is 100.64.0.0/16.
Example patch command to update mtu field
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "ovnKubernetesConfig":{
          "mtu":1200
    }}}}'
```
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As the MCO updates machines in each machine config pool, it reboots each node one by one. You must wait until all the nodes are updated. Check the machine config pool status by entering the following command:
```
oc get mcp
```
```
$ oc get mcp
```
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A successfully updated node has the following status: UPDATED=true, UPDATING=false, DEGRADED=false.
Note
By default, the MCO updates one machine per pool at a time, causing the total time the migration takes to increase with the size of the cluster.

Confirm the status of the new machine configuration on the hosts:

To list the machine configuration state and the name of the applied machine configuration, enter the following command:

oc describe node | egrep "hostname|machineconfig"

$ oc describe node | egrep "hostname|machineconfig"

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Example output

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

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Verify that the following statements are true:

The value of machineconfiguration.openshift.io/state field is Done.
The value of the machineconfiguration.openshift.io/currentConfig field is equal to the value of the machineconfiguration.openshift.io/desiredConfig field.

To confirm that the machine config is correct, enter the following command:
```
oc get machineconfig <config_name> -o yaml | grep ExecStart
```
```
$ oc get machineconfig <config_name> -o yaml | grep ExecStart
```
Copy to Clipboard
where <config_name> is the name of the machine config from the machineconfiguration.openshift.io/currentConfig field.
The machine config must include the following update to the systemd configuration:
```
ExecStart=/usr/local/bin/configure-ovs.sh OVNKubernetes
```
```
ExecStart=/usr/local/bin/configure-ovs.sh OVNKubernetes
```
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If a node is stuck in the NotReady state, investigate the machine config daemon pod logs and resolve any errors.

To list the pods, enter the following command:

oc get pod -n openshift-machine-config-operator

$ oc get pod -n openshift-machine-config-operator

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Example output

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

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The names for the config daemon pods are in the following format: machine-config-daemon-<seq>. The <seq> value is a random five character alphanumeric sequence.

Display the pod log for the first machine config daemon pod shown in the previous output by enter the following command:
```
oc logs <pod> -n openshift-machine-config-operator
```
```
$ oc logs <pod> -n openshift-machine-config-operator
```
Copy to Clipboard
where pod is the name of a machine config daemon pod.
Resolve any errors in the logs shown by the output from the previous command.

To start the migration, configure the OVN-Kubernetes network plugin by using one of the following commands:
- To specify the network provider without changing the cluster network IP address block, enter the following command:
  $ oc patch Network.config.openshift.io cluster \ --type='merge' --patch '{ "spec": { "networkType": "OVNKubernetes" } }'
  Copy to Clipboard
- To specify a different cluster network IP address block, enter the following command:
  $ oc patch Network.config.openshift.io cluster \ --type='merge' --patch '{ "spec": { "clusterNetwork": [ { "cidr": "<cidr>", "hostPrefix": <prefix> } ], "networkType": "OVNKubernetes" } }'
  Copy to Clipboard
  where cidr is a CIDR block and prefix is the slice of the CIDR block apportioned to each node in your cluster. You cannot use any CIDR block that overlaps with the 100.64.0.0/16 CIDR block because the OVN-Kubernetes network provider uses this block internally.
  Important
  You cannot change the service network address block during the migration.

Verify that the Multus daemon set rollout is complete before continuing with subsequent steps:

oc -n openshift-multus rollout status daemonset/multus

$ oc -n openshift-multus rollout status daemonset/multus

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The name of the Multus pods is in the form of multus-<xxxxx> where <xxxxx> is a random sequence of letters. It might take several moments for the pods to restart.

Example output

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

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To complete changing the network plugin, reboot each node in your cluster. You can reboot the nodes in your cluster with either of the following approaches:

Important

The following scripts reboot all of the nodes in the cluster at the same time. This can cause your cluster to be unstable. Another option is to reboot your nodes manually one at a time. Rebooting nodes one-by-one causes considerable downtime in a cluster with many nodes.

Cluster Operators will not work correctly before you reboot the nodes.

With the oc rsh command, you can use a bash script similar to the following:

#!/bin/bash
readarray -t POD_NODES <<< "$(oc get pod -n openshift-machine-config-operator -o wide| grep daemon|awk '{print $1" "$7}')"

for i in "${POD_NODES[@]}"
do
  read -r POD NODE <<< "$i"
  until oc rsh -n openshift-machine-config-operator "$POD" chroot /rootfs shutdown -r +1
    do
      echo "cannot reboot node $NODE, retry" && sleep 3
    done
done

#!/bin/bash
readarray -t POD_NODES <<< "$(oc get pod -n openshift-machine-config-operator -o wide| grep daemon|awk '{print $1" "$7}')"

for i in "${POD_NODES[@]}"
do
  read -r POD NODE <<< "$i"
  until oc rsh -n openshift-machine-config-operator "$POD" chroot /rootfs shutdown -r +1
    do
      echo "cannot reboot node $NODE, retry" && sleep 3
    done
done

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With the ssh command, you can use a bash script similar to the following. The script assumes that you have configured sudo to not prompt for a password.

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

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Confirm that the migration succeeded:
1. To confirm that the network plugin is OVN-Kubernetes, enter the following command. The value of status.networkType must be OVNKubernetes.
  $ oc get network.config/cluster -o jsonpath='{.status.networkType}{"\n"}'
  Copy to Clipboard
2. To confirm that the cluster nodes are in the Ready state, enter the following command:
  $ oc get nodes
  Copy to Clipboard
3. To confirm that your pods are not in an error state, enter the following command:
  $ oc get pods --all-namespaces -o wide --sort-by='{.spec.nodeName}'
  Copy to Clipboard
  If pods on a node are in an error state, reboot that node.
4. To confirm that all of the cluster Operators are not in an abnormal state, enter the following command:
  $ oc get co
  Copy to Clipboard
  The status of every cluster Operator must be the following: AVAILABLE="True", PROGRESSING="False", DEGRADED="False". If a cluster Operator is not available or degraded, check the logs for the cluster Operator for more information.

Complete the following steps only if the migration succeeds and your cluster is in a good state:

To remove the migration configuration from the CNO configuration object, enter the following command:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

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To remove custom configuration for the OpenShift SDN network provider, enter the following command:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "defaultNetwork": { "openshiftSDNConfig": null } } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "defaultNetwork": { "openshiftSDNConfig": null } } }'

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To remove the OpenShift SDN network provider namespace, enter the following command:
```
oc delete namespace openshift-sdn
```
```
$ oc delete namespace openshift-sdn
```
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After a successful migration operation, remove the network.openshift.io/network-type-migration- annotation from the network.config custom resource by entering the following command:
```
oc annotate network.config cluster network.openshift.io/network-type-migration-
```
```
$ oc annotate network.config cluster network.openshift.io/network-type-migration-
```
Copy to Clipboard

Next steps

Optional: After cluster migration, you can convert your IPv4 single-stack cluster to a dual-network cluster network that supports IPv4 and IPv6 address families. For more information, see "Converting to IPv4/IPv6 dual-stack networking".

25.5.4. Understanding changes to external IP behavior in OVN-Kubernetes

When migrating from OpenShift SDN to OVN-Kubernetes (OVN-K), services that use external IPs might become inaccessible across namespaces due to network policy enforcement.

In OpenShift SDN, external IPs were accessible across namespaces by default. However, in OVN-K, network policies strictly enforce multitenant isolation, preventing access to services exposed via external IPs from other namespaces.

To ensure access, consider the following alternatives:

Use an ingress or route: Instead of exposing services by using external IPs, configure an ingress or route to allow external access while maintaining security controls.
Adjust the NetworkPolicy custom resource (CR): Modify a NetworkPolicy CR to explicitly allow access from required namespaces and ensure that traffic is allowed to the designated service ports. Without explicitly allowing traffic to the required ports, access might still be blocked, even if the namespace is allowed.
Use a LoadBalancer service: If applicable, deploy a LoadBalancer service instead of relying on external IPs. For more information about configuring see "NetworkPolicy and external IPs in OVN-Kubernetes".

25.6. Rolling back to the OpenShift SDN network provider

As a cluster administrator, you can rollback to the OpenShift SDN from the OVN-Kubernetes network plugin only after the migration to the OVN-Kubernetes network plugin is completed and successful.

25.6.1. Migrating to the OpenShift SDN network plugin

Cluster administrators can roll back to the OpenShift SDN Container Network Interface (CNI) network plugin by using the offline migration method. During the migration you must manually reboot every node in your cluster. With the offline migration method, there is some downtime, during which your cluster is unreachable.

Important

You must wait until the migration process from OpenShift SDN to OVN-Kubernetes network plugin is successful before initiating a rollback.

Prerequisites

Install the OpenShift CLI (oc).
Access to the cluster as a user with the cluster-admin role.
A cluster installed on infrastructure configured with the OVN-Kubernetes network plugin.
A recent backup of the etcd database is available.
A reboot can be triggered manually for each node.
The cluster is in a known good state, without any errors.

Procedure

Stop all of the machine configuration pools managed by the Machine Config Operator (MCO):

Stop the master configuration pool by entering the following command in your CLI:

oc patch MachineConfigPool master --type='merge' --patch \
  '{ "spec": { "paused": true } }'

$ oc patch MachineConfigPool master --type='merge' --patch \
  '{ "spec": { "paused": true } }'

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Stop the worker machine configuration pool by entering the following command in your CLI:

oc patch MachineConfigPool worker --type='merge' --patch \
  '{ "spec":{ "paused": true } }'

$ oc patch MachineConfigPool worker --type='merge' --patch \
  '{ "spec":{ "paused": true } }'

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To prepare for the migration, set the migration field to null by entering the following command in your CLI:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

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Check that the migration status is empty for the Network.config.openshift.io object by entering the following command in your CLI. Empty command output indicates that the object is not in a migration operation.
```
oc get Network.config cluster -o jsonpath='{.status.migration}'
```
```
$ oc get Network.config cluster -o jsonpath='{.status.migration}'
```
Copy to Clipboard
Apply the patch to the Network.operator.openshift.io object to set the network plugin back to OpenShift SDN by entering the following command in your CLI:
```
oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OpenShiftSDN" } } }'
```
```
$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OpenShiftSDN" } } }'
```
Copy to Clipboard
Important
If you applied the patch to the Network.config.openshift.io object before the patch operation finalizes on the Network.operator.openshift.io object, the Cluster Network Operator (CNO) enters into a degradation state and this causes a slight delay until the CNO recovers from the degraded state.
Confirm that the migration status of the network plugin for the Network.config.openshift.io cluster object is OpenShiftSDN by entering the following command in your CLI:
```
oc get Network.config cluster -o jsonpath='{.status.migration.networkType}'
```
```
$ oc get Network.config cluster -o jsonpath='{.status.migration.networkType}'
```
Copy to Clipboard

Apply the patch to the Network.config.openshift.io object to set the network plugin back to OpenShift SDN by entering the following command in your CLI:

oc patch Network.config.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "networkType": "OpenShiftSDN" } }'

$ oc patch Network.config.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "networkType": "OpenShiftSDN" } }'

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Optional: Disable automatic migration of several OVN-Kubernetes capabilities to the OpenShift SDN equivalents:
- Egress IPs
- Egress firewall
- Multicast
To disable automatic migration of the configuration for any of the previously noted OpenShift SDN features, specify the following keys:
```
oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{
    "spec": {
      "migration": {
        "networkType": "OpenShiftSDN",
        "features": {
          "egressIP": <bool>,
          "egressFirewall": <bool>,
          "multicast": <bool>
        }
      }
    }
  }'
```
Copy to Clipboard
where:
bool: Specifies whether to enable migration of the feature. The default is true.
Optional: You can customize the following settings for OpenShift SDN to meet your network infrastructure requirements:
- Maximum transmission unit (MTU)
- VXLAN port
To customize either or both of the previously noted settings, customize and enter the following command in your CLI. If you do not need to change the default value, omit the key from the patch.
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "openshiftSDNConfig":{
          "mtu":<mtu>,
          "vxlanPort":<port>
    }}}}'
```
Copy to Clipboard
mtu
The MTU for the VXLAN overlay network. This value is normally configured automatically, but if the nodes in your cluster do not all use the same MTU, then you must set this explicitly to 50 less than the smallest node MTU value.
port
The UDP port for the VXLAN overlay network. If a value is not specified, the default is 4789. The port cannot be the same as the Geneve port that is used by OVN-Kubernetes. The default value for the Geneve port is 6081.
Example patch command
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "openshiftSDNConfig":{
          "mtu":1200
    }}}}'
```
Copy to Clipboard

Reboot each node in your cluster. You can reboot the nodes in your cluster with either of the following approaches:

With the oc rsh command, you can use a bash script similar to the following:

#!/bin/bash
readarray -t POD_NODES <<< "$(oc get pod -n openshift-machine-config-operator -o wide| grep daemon|awk '{print $1" "$7}')"

for i in "${POD_NODES[@]}"
do
  read -r POD NODE <<< "$i"
  until oc rsh -n openshift-machine-config-operator "$POD" chroot /rootfs shutdown -r +1
    do
      echo "cannot reboot node $NODE, retry" && sleep 3
    done
done

#!/bin/bash
readarray -t POD_NODES <<< "$(oc get pod -n openshift-machine-config-operator -o wide| grep daemon|awk '{print $1" "$7}')"

for i in "${POD_NODES[@]}"
do
  read -r POD NODE <<< "$i"
  until oc rsh -n openshift-machine-config-operator "$POD" chroot /rootfs shutdown -r +1
    do
      echo "cannot reboot node $NODE, retry" && sleep 3
    done
done

Copy to Clipboard

With the ssh command, you can use a bash script similar to the following. The script assumes that you have configured sudo to not prompt for a password.

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

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Wait until the Multus daemon set rollout completes. Run the following command to see your rollout status:

oc -n openshift-multus rollout status daemonset/multus

$ oc -n openshift-multus rollout status daemonset/multus

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The name of the Multus pods is in the form of multus-<xxxxx> where <xxxxx> is a random sequence of letters. It might take several moments for the pods to restart.

Example output

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

Copy to Clipboard

After the nodes in your cluster have rebooted and the multus pods are rolled out, start all of the machine configuration pools by running the following commands::
- Start the master configuration pool:
  $ oc patch MachineConfigPool master --type='merge' --patch \ '{ "spec": { "paused": false } }'
  Copy to Clipboard
- Start the worker configuration pool:
  $ oc patch MachineConfigPool worker --type='merge' --patch \ '{ "spec": { "paused": false } }'
  Copy to Clipboard
As the MCO updates machines in each config pool, it reboots each node.
By default the MCO updates a single machine per pool at a time, so the time that the migration requires to complete grows with the size of the cluster.

Confirm the status of the new machine configuration on the hosts:

To list the machine configuration state and the name of the applied machine configuration, enter the following command in your CLI:

oc describe node | egrep "hostname|machineconfig"

$ oc describe node | egrep "hostname|machineconfig"

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Example output

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

Copy to Clipboard

Verify that the following statements are true:

The value of machineconfiguration.openshift.io/state field is Done.
The value of the machineconfiguration.openshift.io/currentConfig field is equal to the value of the machineconfiguration.openshift.io/desiredConfig field.

To confirm that the machine config is correct, enter the following command in your CLI:
```
oc get machineconfig <config_name> -o yaml
```
```
$ oc get machineconfig <config_name> -o yaml
```
Copy to Clipboard
where <config_name> is the name of the machine config from the machineconfiguration.openshift.io/currentConfig field.

Confirm that the migration succeeded:

To confirm that the network plugin is OpenShift SDN, enter the following command in your CLI. The value of status.networkType must be OpenShiftSDN.
```
oc get Network.config/cluster -o jsonpath='{.status.networkType}{"\n"}'
```
```
$ oc get Network.config/cluster -o jsonpath='{.status.networkType}{"\n"}'
```
Copy to Clipboard
To confirm that the cluster nodes are in the Ready state, enter the following command in your CLI:
```
oc get nodes
```
```
$ oc get nodes
```
Copy to Clipboard

If a node is stuck in the NotReady state, investigate the machine config daemon pod logs and resolve any errors.

To list the pods, enter the following command in your CLI:

oc get pod -n openshift-machine-config-operator

$ oc get pod -n openshift-machine-config-operator

Copy to Clipboard

Example output

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

Copy to Clipboard

The names for the config daemon pods are in the following format: machine-config-daemon-<seq>. The <seq> value is a random five character alphanumeric sequence.

To display the pod log for each machine config daemon pod shown in the previous output, enter the following command in your CLI:
```
oc logs <pod> -n openshift-machine-config-operator
```
```
$ oc logs <pod> -n openshift-machine-config-operator
```
Copy to Clipboard
where pod is the name of a machine config daemon pod.
Resolve any errors in the logs shown by the output from the previous command.

To confirm that your pods are not in an error state, enter the following command in your CLI:
```
oc get pods --all-namespaces -o wide --sort-by='{.spec.nodeName}'
```
```
$ oc get pods --all-namespaces -o wide --sort-by='{.spec.nodeName}'
```
Copy to Clipboard
If pods on a node are in an error state, reboot that node.

Complete the following steps only if the migration succeeds and your cluster is in a good state:

To remove the migration configuration from the Cluster Network Operator configuration object, enter the following command in your CLI:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

Copy to Clipboard

To remove the OVN-Kubernetes configuration, enter the following command in your CLI:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "defaultNetwork": { "ovnKubernetesConfig":null } } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "defaultNetwork": { "ovnKubernetesConfig":null } } }'

Copy to Clipboard

To remove the OVN-Kubernetes network provider namespace, enter the following command in your CLI:
```
oc delete namespace openshift-ovn-kubernetes
```
```
$ oc delete namespace openshift-ovn-kubernetes
```
Copy to Clipboard

25.7. Migrating from the Kuryr network plugin to the OVN-Kubernetes network plugin

Important

Migration from Kuryr to OVN-Kubernetes is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope.

As the administrator of a cluster that runs on Red Hat OpenStack Platform (RHOSP), you can migrate to the OVN-Kubernetes network plugin from the Kuryr SDN network plugin.

To learn more about OVN-Kubernetes, read About the OVN-Kubernetes network plugin.

25.7.1. Migration to the OVN-Kubernetes network provider

You can manually migrate a cluster that runs on Red Hat OpenStack Platform (RHOSP) to the OVN-Kubernetes network provider.

Important

Migration to OVN-Kubernetes is a one-way process. During migration, your cluster will be unreachable for a brief time.

25.7.1.1. Considerations when migrating to the OVN-Kubernetes network provider

Kubernetes namespaces are kept by Kuryr in separate RHOSP networking service (Neutron) subnets. Those subnets and the IP addresses that are assigned to individual pods are not preserved during the migration.

25.7.1.2. How the migration process works

The following table summarizes the migration process by relating the steps that you perform with the actions that your cluster and Operators take.

Table 25.9. The Kuryr to OVN-Kubernetes migration process
User-initiated steps	Migration activity
Set the `migration` field of the `Network.operator.openshift.io` custom resource (CR) named `cluster` to `OVNKubernetes`. Verify that the value of the `migration` field prints the `null` value before setting it to another value.	Cluster Network Operator (CNO) Updates the status of the `Network.config.openshift.io` CR named `cluster` accordingly. Machine Config Operator (MCO) Deploys an update to the systemd configuration that is required by OVN-Kubernetes. By default, the MCO updates a single machine per pool at a time. As a result, large clusters have longer migration times.
Update the `networkType` field of the `Network.config.openshift.io` CR.	CNO Performs the following actions: Destroys the Kuryr control plane pods: Kuryr CNIs and the Kuryr controller. Deploys the OVN-Kubernetes control plane pods. Updates the Multus objects to reflect the new network plugin.
Reboot each node in the cluster.	Cluster As nodes reboot, the cluster assigns IP addresses to pods on the OVN-Kubernetes cluster network.
Clean up remaining resources Kuryr controlled.	Cluster Holds RHOSP resources that need to be freed, as well as OpenShift Container Platform resources to configure.

25.7.2. Migrating to the OVN-Kubernetes network plugin

As a cluster administrator, you can change the network plugin for your cluster to OVN-Kubernetes.

Important

During the migration, you must reboot every node in your cluster. Your cluster is unavailable and workloads might be interrupted. Perform the migration only if an interruption in service is acceptable.

Prerequisites

You installed the OpenShift CLI (oc).
You have access to the cluster as a user with the cluster-admin role.
You have a recent backup of the etcd database is available.
You can manually reboot each node.
The cluster you plan to migrate is in a known good state, without any errors.
You installed the Python interpreter.
You installed the openstacksdk python package.
You installed the openstack CLI tool.
You have access to the underlying RHOSP cloud.

Procedure

Back up the configuration for the cluster network by running the following command:

oc get Network.config.openshift.io cluster -o yaml > cluster-kuryr.yaml

$ oc get Network.config.openshift.io cluster -o yaml > cluster-kuryr.yaml

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To set the CLUSTERID variable, run the following command:

CLUSTERID=$(oc get infrastructure.config.openshift.io cluster -o=jsonpath='{.status.infrastructureName}')

$ CLUSTERID=$(oc get infrastructure.config.openshift.io cluster -o=jsonpath='{.status.infrastructureName}')

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To prepare all the nodes for the migration, set the migration field on the Cluster Network Operator configuration object by running the following command:
```
oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OVNKubernetes" } } }'
```
```
$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OVNKubernetes" } } }'
```
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Note
This step does not deploy OVN-Kubernetes immediately. Specifying the migration field triggers the Machine Config Operator (MCO) to apply new machine configs to all the nodes in the cluster. This prepares the cluster for the OVN-Kubernetes deployment.
Optional: Customize the following settings for OVN-Kubernetes for your network infrastructure requirements:
- Maximum transmission unit (MTU)
- Geneve (Generic Network Virtualization Encapsulation) overlay network port
- OVN-Kubernetes IPv4 internal subnet
- OVN-Kubernetes IPv6 internal subnet
To customize these settings, enter and customize the following command:
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "ovnKubernetesConfig":{
          "mtu":<mtu>,
          "genevePort":<port>,
          "v4InternalSubnet":"<ipv4_subnet>",
          "v6InternalSubnet":"<ipv6_subnet>"
    }}}}'
```
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where:
mtu
Specifies the MTU for the Geneve overlay network. This value is normally configured automatically, but if the nodes in your cluster do not all use the same MTU, then you must set this explicitly to 100 less than the smallest node MTU value.
port
Specifies the UDP port for the Geneve overlay network. If a value is not specified, the default is 6081. The port cannot be the same as the VXLAN port that is used by Kuryr. The default value for the VXLAN port is 4789.
ipv4_subnet
Specifies an IPv4 address range for internal use by OVN-Kubernetes. You must ensure that the IP address range does not overlap with any other subnet used by your OpenShift Container Platform installation. The IP address range must be larger than the maximum number of nodes that can be added to the cluster. The default value is 100.64.0.0/16.
ipv6_subnet
Specifies an IPv6 address range for internal use by OVN-Kubernetes. You must ensure that the IP address range does not overlap with any other subnet used by your OpenShift Container Platform installation. The IP address range must be larger than the maximum number of nodes that can be added to the cluster. The default value is fd98::/48.
If you do not need to change the default value, omit the key from the patch.
Example patch command to update mtu field
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "ovnKubernetesConfig":{
          "mtu":1200
    }}}}'
```
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Check the machine config pool status by entering the following command:
```
oc get mcp
```
```
$ oc get mcp
```
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While the MCO updates machines in each machine config pool, it reboots each node one by one. You must wait until all the nodes are updated before continuing.
A successfully updated node has the following status: UPDATED=true, UPDATING=false, DEGRADED=false.
Note
By default, the MCO updates one machine per pool at a time. Large clusters take more time to migrate than small clusters.

Confirm the status of the new machine configuration on the hosts:

To list the machine configuration state and the name of the applied machine configuration, enter the following command:

oc describe node | egrep "hostname|machineconfig"

$ oc describe node | egrep "hostname|machineconfig"

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Example output

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b 
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b 
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b

1


machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b

2


machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

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Review the output from the previous step. The following statements must be true:
- The value of machineconfiguration.openshift.io/state field is Done.
- The value of the machineconfiguration.openshift.io/currentConfig field is equal to the value of the machineconfiguration.openshift.io/desiredConfig field.
To confirm that the machine config is correct, enter the following command:
```
oc get machineconfig <config_name> -o yaml | grep ExecStart
```
```
$ oc get machineconfig <config_name> -o yaml | grep ExecStart
```
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where:
<config_name>
Specifies the name of the machine config from the machineconfiguration.openshift.io/currentConfig field.
The machine config must include the following update to the systemd configuration:
Example output

ExecStart=/usr/local/bin/configure-ovs.sh OVNKubernetes

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If a node is stuck in the NotReady state, investigate the machine config daemon pod logs and resolve any errors:

To list the pods, enter the following command:

oc get pod -n openshift-machine-config-operator

$ oc get pod -n openshift-machine-config-operator

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Example output

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

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The names for the config daemon pods are in the following format: machine-config-daemon-<seq>. The <seq> value is a random five character alphanumeric sequence.

Display the pod log for the first machine config daemon pod shown in the previous output by enter the following command:
```
oc logs <pod> -n openshift-machine-config-operator
```
```
$ oc logs <pod> -n openshift-machine-config-operator
```
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where:
<pod>
Specifies the name of a machine config daemon pod.
Resolve any errors in the logs shown by the output from the previous command.

To start the migration, configure the OVN-Kubernetes network plugin by using one of the following commands:
- To specify the network provider without changing the cluster network IP address block, enter the following command:
  $ oc patch Network.config.openshift.io cluster \ --type='merge' --patch '{ "spec": { "networkType": "OVNKubernetes" } }'
  Copy to Clipboard
- To specify a different cluster network IP address block, enter the following command:
  $ oc patch Network.config.openshift.io cluster \ --type='merge' --patch '{ "spec": { "clusterNetwork": [ { "cidr": "<cidr>", "hostPrefix": "<prefix>" } ] "networkType": "OVNKubernetes" } }'
  Copy to Clipboard
  where:
  <cidr>
  Specifies a CIDR block.
  <prefix>
  Specifies a slice of the CIDR block that is apportioned to each node in your cluster.
  Important
  You cannot change the service network address block during the migration.
  You cannot use any CIDR block that overlaps with the 100.64.0.0/16 CIDR block because the OVN-Kubernetes network provider uses this block internally.

Verify that the Multus daemon set rollout is complete by entering the following command:

oc -n openshift-multus rollout status daemonset/multus

$ oc -n openshift-multus rollout status daemonset/multus

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The name of the Multus pods is in the form of multus-<xxxxx>, where <xxxxx> is a random sequence of letters. It might take several moments for the pods to restart.

Example output

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

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To complete the migration, reboot each node in your cluster. For example, you can use a bash script similar to the following example. The script assumes that you can connect to each host by using ssh and that you have configured sudo to not prompt for a password:

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

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Note

If SSH access is not available, you can use the openstack command:

for name in $(openstack server list --name ${CLUSTERID}\* -f value -c Name); do openstack server reboot $name; done

$ for name in $(openstack server list --name ${CLUSTERID}\* -f value -c Name); do openstack server reboot $name; done

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Alternatively, you might be able to reboot each node through the management portal for your infrastructure provider. Otherwise, contact the appropriate authority to either gain access to the virtual machines through SSH or the management portal and OpenStack client.

Verification

Confirm that the migration succeeded, and then remove the migration resources:
1. To confirm that the network plugin is OVN-Kubernetes, enter the following command.
  $ oc get network.config/cluster -o jsonpath='{.status.networkType}{"\n"}'
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  The value of status.networkType must be OVNKubernetes.
2. To confirm that the cluster nodes are in the Ready state, enter the following command:
  $ oc get nodes
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3. To confirm that your pods are not in an error state, enter the following command:
  $ oc get pods --all-namespaces -o wide --sort-by='{.spec.nodeName}'
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  If pods on a node are in an error state, reboot that node.
4. To confirm that all of the cluster Operators are not in an abnormal state, enter the following command:
  $ oc get co
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  The status of every cluster Operator must be the following: AVAILABLE="True", PROGRESSING="False", DEGRADED="False". If a cluster Operator is not available or degraded, check the logs for the cluster Operator for more information.
  Important
  Do not proceed if any of the previous verification steps indicate errors. You might encounter pods that have a Terminating state due to finalizers that are removed during clean up. They are not an error indication.

If the migration completed and your cluster is in a good state, remove the migration configuration from the CNO configuration object by entering the following command:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

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25.7.3. Cleaning up resources after migration

After migration from the Kuryr network plugin to the OVN-Kubernetes network plugin, you must clean up the resources that Kuryr created previously.

Note

The clean up process relies on a Python virtual environment to ensure that the package versions that you use support tags for Octavia objects. You do not need a virtual environment if you are certain that your environment uses at minimum: * openstacksdk version 0.54.0 * python-openstackclient version 5.5.0 * python-octaviaclient version 2.3.0

Prerequisites

You installed the OpenShift Container Platform CLI (oc).
You installed a Python interpreter.
You installed the openstacksdk Python package.
You installed the openstack CLI.
You have access to the underlying RHOSP cloud.
You can access the cluster as a user with the cluster-admin role.

Procedure

Create a clean-up Python virtual environment:
1. Create a temporary directory for your environment. For example:
  $ python3 -m venv /tmp/venv
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  The virtual environment located in /tmp/venv directory is used in all clean up examples.
2. Enter the virtual environment. For example:
  $ source /tmp/venv/bin/activate
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3. Upgrade the pip command in the virtual environment by running the following command:
  (venv) $ pip install pip --upgrade
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4. Install the required Python packages by running the following command:
  (venv) $ pip install openstacksdk==0.54.0 python-openstackclient==5.5.0 python-octaviaclient==2.3.0
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In your terminal, set variables to cluster and Kuryr identifiers by running the following commands:

Set the cluster ID:

(venv) $ CLUSTERID=$(oc get infrastructure.config.openshift.io cluster -o=jsonpath='{.status.infrastructureName}')

(venv) $ CLUSTERID=$(oc get infrastructure.config.openshift.io cluster -o=jsonpath='{.status.infrastructureName}')

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Set the cluster tag:

(venv) $ CLUSTERTAG="openshiftClusterID=${CLUSTERID}"

(venv) $ CLUSTERTAG="openshiftClusterID=${CLUSTERID}"

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Set the router ID:

(venv) $ ROUTERID=$(oc get kuryrnetwork -A --no-headers -o custom-columns=":status.routerId"|head -n 1)

(venv) $ ROUTERID=$(oc get kuryrnetwork -A --no-headers -o custom-columns=":status.routerId"|head -n 1)

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Create a Bash function that removes finalizers from specified resources by running the following command:

(venv) $ function REMFIN {
    local resource=$1
    local finalizer=$2
    for res in $(oc get $resource -A --template='{{range $i,$p := .items}}{{ $p.metadata.name }}|{{ $p.metadata.namespace }}{{"\n"}}{{end}}'); do
        name=${res%%|*}
        ns=${res##*|}
        yaml=$(oc get -n $ns $resource $name -o yaml)
        if echo "${yaml}" | grep -q "${finalizer}"; then
            echo "${yaml}" | grep -v  "${finalizer}" | oc replace -n $ns $resource $name -f -
        fi
    done
}

(venv) $ function REMFIN {
    local resource=$1
    local finalizer=$2
    for res in $(oc get $resource -A --template='{{range $i,$p := .items}}{{ $p.metadata.name }}|{{ $p.metadata.namespace }}{{"\n"}}{{end}}'); do
        name=${res%%|*}
        ns=${res##*|}
        yaml=$(oc get -n $ns $resource $name -o yaml)
        if echo "${yaml}" | grep -q "${finalizer}"; then
            echo "${yaml}" | grep -v  "${finalizer}" | oc replace -n $ns $resource $name -f -
        fi
    done
}

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The function takes two parameters: the first parameter is name of the resource, and the second parameter is the finalizer to remove. The named resource is removed from the cluster and its definition is replaced with copied data, excluding the specified finalizer.

To remove Kuryr finalizers from services, enter the following command:

(venv) $ REMFIN services kuryr.openstack.org/service-finalizer

(venv) $ REMFIN services kuryr.openstack.org/service-finalizer

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To remove the Kuryr service-subnet-gateway-ip service, enter the following command:

(venv) $ if $(oc get -n openshift-kuryr service service-subnet-gateway-ip &>/dev/null); then
    oc -n openshift-kuryr delete service service-subnet-gateway-ip
fi

(venv) $ if $(oc get -n openshift-kuryr service service-subnet-gateway-ip &>/dev/null); then
    oc -n openshift-kuryr delete service service-subnet-gateway-ip
fi

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To remove all tagged RHOSP load balancers from Octavia, enter the following command:

(venv) $ for lb in $(openstack loadbalancer list --tags $CLUSTERTAG -f value -c id); do
    openstack loadbalancer delete --cascade $lb
done

(venv) $ for lb in $(openstack loadbalancer list --tags $CLUSTERTAG -f value -c id); do
    openstack loadbalancer delete --cascade $lb
done

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To remove Kuryr finalizers from all KuryrLoadBalancer CRs, enter the following command:

(venv) $ REMFIN kuryrloadbalancers.openstack.org kuryr.openstack.org/kuryrloadbalancer-finalizers

(venv) $ REMFIN kuryrloadbalancers.openstack.org kuryr.openstack.org/kuryrloadbalancer-finalizers

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To remove the openshift-kuryr namespace, enter the following command:
```
(venv) $ oc delete namespace openshift-kuryr
```
```
(venv) $ oc delete namespace openshift-kuryr
```
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To remove the Kuryr service subnet from the router, enter the following command:

(venv) $ openstack router remove subnet $ROUTERID ${CLUSTERID}-kuryr-service-subnet

(venv) $ openstack router remove subnet $ROUTERID ${CLUSTERID}-kuryr-service-subnet

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To remove the Kuryr service network, enter the following command:

(venv) $ openstack network delete ${CLUSTERID}-kuryr-service-network

(venv) $ openstack network delete ${CLUSTERID}-kuryr-service-network

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To remove Kuryr finalizers from all pods, enter the following command:

(venv) $ REMFIN pods kuryr.openstack.org/pod-finalizer

(venv) $ REMFIN pods kuryr.openstack.org/pod-finalizer

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To remove Kuryr finalizers from all KuryrPort CRs, enter the following command:

(venv) $ REMFIN kuryrports.openstack.org kuryr.openstack.org/kuryrport-finalizer

(venv) $ REMFIN kuryrports.openstack.org kuryr.openstack.org/kuryrport-finalizer

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This command deletes the KuryrPort CRs.

To remove Kuryr finalizers from network policies, enter the following command:

(venv) $ REMFIN networkpolicy kuryr.openstack.org/networkpolicy-finalizer

(venv) $ REMFIN networkpolicy kuryr.openstack.org/networkpolicy-finalizer

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To remove Kuryr finalizers from remaining network policies, enter the following command:

(venv) $ REMFIN kuryrnetworkpolicies.openstack.org kuryr.openstack.org/networkpolicy-finalizer

(venv) $ REMFIN kuryrnetworkpolicies.openstack.org kuryr.openstack.org/networkpolicy-finalizer

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To remove subports that Kuryr created from trunks, enter the following command:

(venv) $ read -ra trunks <<< $(python -c "import openstack; n = openstack.connect().network; print(' '.join([x.id for x in n.trunks(any_tags='$CLUSTERTAG')]))") && \
i=0 && \
for trunk in "${trunks[@]}"; do
    i=$((i+1))
    echo "Processing trunk $trunk, ${i}/${#trunks[@]}."
    subports=()
    for subport in $(python -c "import openstack; n = openstack.connect().network; print(' '.join([x['port_id'] for x in n.get_trunk('$trunk').sub_ports if '$CLUSTERTAG' in n.get_port(x['port_id']).tags]))"); do
        subports+=("$subport");
    done
    args=()
    for sub in "${subports[@]}" ; do
        args+=("--subport $sub")
    done
    if [ ${#args[@]} -gt 0 ]; then
        openstack network trunk unset ${args[*]} $trunk
    fi
done

(venv) $ read -ra trunks <<< $(python -c "import openstack; n = openstack.connect().network; print(' '.join([x.id for x in n.trunks(any_tags='$CLUSTERTAG')]))") && \
i=0 && \
for trunk in "${trunks[@]}"; do
    i=$((i+1))
    echo "Processing trunk $trunk, ${i}/${#trunks[@]}."
    subports=()
    for subport in $(python -c "import openstack; n = openstack.connect().network; print(' '.join([x['port_id'] for x in n.get_trunk('$trunk').sub_ports if '$CLUSTERTAG' in n.get_port(x['port_id']).tags]))"); do
        subports+=("$subport");
    done
    args=()
    for sub in "${subports[@]}" ; do
        args+=("--subport $sub")
    done
    if [ ${#args[@]} -gt 0 ]; then
        openstack network trunk unset ${args[*]} $trunk
    fi
done

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To retrieve all networks and subnets from KuryrNetwork CRs and remove ports, router interfaces and the network itself, enter the following command:

(venv) $ mapfile -t kuryrnetworks < <(oc get kuryrnetwork -A --template='{{range $i,$p := .items}}{{ $p.status.netId }}|{{ $p.status.subnetId }}{{"\n"}}{{end}}') && \
i=0 && \
for kn in "${kuryrnetworks[@]}"; do
    i=$((i+1))
    netID=${kn%%|*}
    subnetID=${kn##*|}
    echo "Processing network $netID, ${i}/${#kuryrnetworks[@]}"
    # Remove all ports from the network.
    for port in $(python -c "import openstack; n = openstack.connect().network; print(' '.join([x.id for x in n.ports(network_id='$netID') if x.device_owner != 'network:router_interface']))"); do
        ( openstack port delete $port ) &

        # Only allow 20 jobs in parallel.
        if [[ $(jobs -r -p | wc -l) -ge 20 ]]; then
            wait -n
        fi
    done
    wait

    # Remove the subnet from the router.
    openstack router remove subnet $ROUTERID $subnetID

    # Remove the network.
    openstack network delete $netID
done

(venv) $ mapfile -t kuryrnetworks < <(oc get kuryrnetwork -A --template='{{range $i,$p := .items}}{{ $p.status.netId }}|{{ $p.status.subnetId }}{{"\n"}}{{end}}') && \
i=0 && \
for kn in "${kuryrnetworks[@]}"; do
    i=$((i+1))
    netID=${kn%%|*}
    subnetID=${kn##*|}
    echo "Processing network $netID, ${i}/${#kuryrnetworks[@]}"
    # Remove all ports from the network.
    for port in $(python -c "import openstack; n = openstack.connect().network; print(' '.join([x.id for x in n.ports(network_id='$netID') if x.device_owner != 'network:router_interface']))"); do
        ( openstack port delete $port ) &

        # Only allow 20 jobs in parallel.
        if [[ $(jobs -r -p | wc -l) -ge 20 ]]; then
            wait -n
        fi
    done
    wait

    # Remove the subnet from the router.
    openstack router remove subnet $ROUTERID $subnetID

    # Remove the network.
    openstack network delete $netID
done

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To remove the Kuryr security group, enter the following command:

(venv) $ openstack security group delete ${CLUSTERID}-kuryr-pods-security-group

(venv) $ openstack security group delete ${CLUSTERID}-kuryr-pods-security-group

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To remove all tagged subnet pools, enter the following command:

(venv) $ for subnetpool in $(openstack subnet pool list --tags $CLUSTERTAG -f value -c ID); do
    openstack subnet pool delete $subnetpool
done

(venv) $ for subnetpool in $(openstack subnet pool list --tags $CLUSTERTAG -f value -c ID); do
    openstack subnet pool delete $subnetpool
done

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To check that all of the networks based on KuryrNetwork CRs were removed, enter the following command:

(venv) $ networks=$(oc get kuryrnetwork -A --no-headers -o custom-columns=":status.netId") && \
for existingNet in $(openstack network list --tags $CLUSTERTAG -f value -c ID); do
    if [[ $networks =~ $existingNet ]]; then
        echo "Network still exists: $existingNet"
    fi
done

(venv) $ networks=$(oc get kuryrnetwork -A --no-headers -o custom-columns=":status.netId") && \
for existingNet in $(openstack network list --tags $CLUSTERTAG -f value -c ID); do
    if [[ $networks =~ $existingNet ]]; then
        echo "Network still exists: $existingNet"
    fi
done

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If the command returns any existing networks, intestigate and remove them before you continue.

To remove security groups that are related to network policy, enter the following command:

(venv) $ for sgid in $(openstack security group list -f value -c ID -c Description | grep 'Kuryr-Kubernetes Network Policy' | cut -f 1 -d ' '); do
    openstack security group delete $sgid
done

(venv) $ for sgid in $(openstack security group list -f value -c ID -c Description | grep 'Kuryr-Kubernetes Network Policy' | cut -f 1 -d ' '); do
    openstack security group delete $sgid
done

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To remove finalizers from KuryrNetwork CRs, enter the following command:

(venv) $ REMFIN kuryrnetworks.openstack.org kuryrnetwork.finalizers.kuryr.openstack.org

(venv) $ REMFIN kuryrnetworks.openstack.org kuryrnetwork.finalizers.kuryr.openstack.org

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To remove the Kuryr router, enter the following command:

(venv) $ if $(python3 -c "import sys; import openstack; n = openstack.connect().network; r = n.get_router('$ROUTERID'); sys.exit(0) if r.description != 'Created By OpenShift Installer' else sys.exit(1)"); then
    openstack router delete $ROUTERID
fi

(venv) $ if $(python3 -c "import sys; import openstack; n = openstack.connect().network; r = n.get_router('$ROUTERID'); sys.exit(0) if r.description != 'Created By OpenShift Installer' else sys.exit(1)"); then
    openstack router delete $ROUTERID
fi

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25.8. Converting to IPv4/IPv6 dual-stack networking

As a cluster administrator, you can convert your IPv4 single-stack cluster to a dual-network cluster network that supports IPv4 and IPv6 address families. After converting to dual-stack, all newly created pods are dual-stack enabled.

Note

A dual-stack network is supported on clusters provisioned on bare metal, VMware vSphere, IBM Power, IBM Z infrastructure, and single node OpenShift clusters.

Note

While using dual-stack networking, you cannot use IPv4-mapped IPv6 addresses, such as ::FFFF:198.51.100.1, where IPv6 is required.

25.8.1. Converting to a dual-stack cluster network

As a cluster administrator, you can convert your single-stack cluster network to a dual-stack cluster network.

Note

After converting to dual-stack networking only newly created pods are assigned IPv6 addresses. Any pods created before the conversion must be recreated to receive an IPv6 address.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
Your cluster uses the OVN-Kubernetes network plugin.
The cluster nodes have IPv6 addresses.
You have configured an IPv6-enabled router based on your infrastructure.

Procedure

To specify IPv6 address blocks for the cluster and service networks, create a file containing the following YAML:
```
- op: add
  path: /spec/clusterNetwork/-
  value: 
    cidr: fd01::/48
    hostPrefix: 64
- op: add
  path: /spec/serviceNetwork/-
  value: fd02::/112 
```
```
- op: add
  path: /spec/clusterNetwork/-
  value: 
```
1
```
    cidr: fd01::/48
    hostPrefix: 64
- op: add
  path: /spec/serviceNetwork/-
  value: fd02::/112 
```
2
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1
Specify an object with the cidr and hostPrefix parameters. The host prefix must be 64 or greater. The IPv6 Classless Inter-Domain Routing (CIDR) prefix must be large enough to accommodate the specified host prefix.
1 2
Specify an IPv6 CIDR with a prefix of 112. Kubernetes uses only the lowest 16 bits. For a prefix of 112, IP addresses are assigned from 112 to 128 bits.

To patch the cluster network configuration, enter the following command:

oc patch network.config.openshift.io cluster \
  --type='json' --patch-file <file>.yaml

$ oc patch network.config.openshift.io cluster \
  --type='json' --patch-file <file>.yaml

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where:

file

Specifies the name of the file you created in the previous step.

Example output

network.config.openshift.io/cluster patched

network.config.openshift.io/cluster patched

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Verification

Complete the following step to verify that the cluster network recognizes the IPv6 address blocks that you specified in the previous procedure.

Display the network configuration:

oc describe network

$ oc describe network

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Example output

Status:
  Cluster Network:
    Cidr:               10.128.0.0/14
    Host Prefix:        23
    Cidr:               fd01::/48
    Host Prefix:        64
  Cluster Network MTU:  1400
  Network Type:         OVNKubernetes
  Service Network:
    172.30.0.0/16
    fd02::/112

Status:
  Cluster Network:
    Cidr:               10.128.0.0/14
    Host Prefix:        23
    Cidr:               fd01::/48
    Host Prefix:        64
  Cluster Network MTU:  1400
  Network Type:         OVNKubernetes
  Service Network:
    172.30.0.0/16
    fd02::/112

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25.8.2. Converting to a single-stack cluster network

As a cluster administrator, you can convert your dual-stack cluster network to a single-stack cluster network.

Important

If you originally converted your IPv4 single-stack cluster network to a dual-stack cluster, you can convert only back to the IPv4 single-stack cluster and not an IPv6 single-stack cluster network. The same restriction applies for converting back to an IPv6 single-stack cluster network.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
Your cluster uses the OVN-Kubernetes network plugin.
The cluster nodes have IPv6 addresses.
You have enabled dual-stack networking.

Procedure

Edit the networks.config.openshift.io custom resource (CR) by running the following command:
```
oc edit networks.config.openshift.io
```
```
$ oc edit networks.config.openshift.io
```
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Remove the IPv4 or IPv6 configuration that you added to the cidr and the hostPrefix parameters from completing the "Converting to a dual-stack cluster network " procedure steps.

25.9. Logging for egress firewall and network policy rules

As a cluster administrator, you can configure audit logging for your cluster and enable logging for one or more namespaces. OpenShift Container Platform produces audit logs for both egress firewalls and network policies.

Note

Audit logging is available for only the OVN-Kubernetes network plugin.

25.9.1. Audit logging

The OVN-Kubernetes network plugin uses Open Virtual Network (OVN) ACLs to manage egress firewalls and network policies. Audit logging exposes allow and deny ACL events.

You can configure the destination for audit logs, such as a syslog server or a UNIX domain socket. Regardless of any additional configuration, an audit log is always saved to /var/log/ovn/acl-audit-log.log on each OVN-Kubernetes pod in the cluster.

You can enable audit logging for each namespace by annotating each namespace configuration with a k8s.ovn.org/acl-logging section. In the k8s.ovn.org/acl-logging section, you must specify allow, deny, or both values to enable audit logging for a namespace.

Note

A network policy does not support setting the Pass action set as a rule.

The ACL-logging implementation logs access control list (ACL) events for a network. You can view these logs to analyze any potential security issues.

Example namespace annotation

kind: Namespace
apiVersion: v1
metadata:
  name: example1
  annotations:
    k8s.ovn.org/acl-logging: |-
      {
        "deny": "info",
        "allow": "info"
      }

kind: Namespace
apiVersion: v1
metadata:
  name: example1
  annotations:
    k8s.ovn.org/acl-logging: |-
      {
        "deny": "info",
        "allow": "info"
      }

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To view the default ACL logging configuration values, see the policyAuditConfig object in the cluster-network-03-config.yml file. If required, you can change the ACL logging configuration values for log file parameters in this file.

The logging message format is compatible with syslog as defined by RFC5424. The syslog facility is configurable and defaults to local0. The following example shows key parameters and their values outputted in a log message:

Example logging message that outputs parameters and their values

<timestamp>|<message_serial>|acl_log(ovn_pinctrl0)|<severity>|name="<acl_name>", verdict="<verdict>", severity="<severity>", direction="<direction>": <flow>

<timestamp>|<message_serial>|acl_log(ovn_pinctrl0)|<severity>|name="<acl_name>", verdict="<verdict>", severity="<severity>", direction="<direction>": <flow>

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Where:

<timestamp> states the time and date for the creation of a log message.
<message_serial> lists the serial number for a log message.
acl_log(ovn_pinctrl0) is a literal string that prints the location of the log message in the OVN-Kubernetes plugin.
<severity> sets the severity level for a log message. If you enable audit logging that supports allow and deny tasks then two severity levels show in the log message output.
<name> states the name of the ACL-logging implementation in the OVN Network Bridging Database (nbdb) that was created by the network policy.
<verdict> can be either allow or drop.
<direction> can be either to-lport or from-lport to indicate that the policy was applied to traffic going to or away from a pod.
<flow> shows packet information in a format equivalent to the OpenFlow protocol. This parameter comprises Open vSwitch (OVS) fields.

The following example shows OVS fields that the flow parameter uses to extract packet information from system memory:

Example of OVS fields used by the flow parameter to extract packet information

<proto>,vlan_tci=0x0000,dl_src=<src_mac>,dl_dst=<source_mac>,nw_src=<source_ip>,nw_dst=<target_ip>,nw_tos=<tos_dscp>,nw_ecn=<tos_ecn>,nw_ttl=<ip_ttl>,nw_frag=<fragment>,tp_src=<tcp_src_port>,tp_dst=<tcp_dst_port>,tcp_flags=<tcp_flags>

<proto>,vlan_tci=0x0000,dl_src=<src_mac>,dl_dst=<source_mac>,nw_src=<source_ip>,nw_dst=<target_ip>,nw_tos=<tos_dscp>,nw_ecn=<tos_ecn>,nw_ttl=<ip_ttl>,nw_frag=<fragment>,tp_src=<tcp_src_port>,tp_dst=<tcp_dst_port>,tcp_flags=<tcp_flags>

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Where:

<proto> states the protocol. Valid values are tcp and udp.
vlan_tci=0x0000 states the VLAN header as 0 because a VLAN ID is not set for internal pod network traffic.
<src_mac> specifies the source for the Media Access Control (MAC) address.
<source_mac> specifies the destination for the MAC address.
<source_ip> lists the source IP address
<target_ip> lists the target IP address.
<tos_dscp> states Differentiated Services Code Point (DSCP) values to classify and prioritize certain network traffic over other traffic.
<tos_ecn> states Explicit Congestion Notification (ECN) values that indicate any congested traffic in your network.
<ip_ttl> states the Time To Live (TTP) information for an packet.
<fragment> specifies what type of IP fragments or IP non-fragments to match.
<tcp_src_port> shows the source for the port for TCP and UDP protocols.
<tcp_dst_port> lists the destination port for TCP and UDP protocols.
<tcp_flags> supports numerous flags such as SYN, ACK, PSH and so on. If you need to set multiple values then each value is separated by a vertical bar (|). The UDP protocol does not support this parameter.

Note

For more information about the previous field descriptions, go to the OVS manual page for ovs-fields.

Example ACL deny log entry for a network policy

Defaulting container name to ovn-controller.
Use 'oc describe pod/ovnkube-node-hdb8v -n openshift-ovn-kubernetes' to see all of the containers in this pod.
2021-06-13T19:33:11.590Z|00005|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:33:12.614Z|00006|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:10.037Z|00007|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:11.037Z|00008|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0

Defaulting container name to ovn-controller.
Use 'oc describe pod/ovnkube-node-hdb8v -n openshift-ovn-kubernetes' to see all of the containers in this pod.
2021-06-13T19:33:11.590Z|00005|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:33:12.614Z|00006|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:10.037Z|00007|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:11.037Z|00008|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0

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The following table describes namespace annotation values:

Table 25.10. Audit logging namespace annotation for k8s.ovn.org/acl-logging
Field	Description
`deny`	Blocks namespace access to any traffic that matches an ACL rule with the `deny` action. The field supports `alert`, `warning`, `notice`, `info`, or `debug` values.
`allow`	Permits namespace access to any traffic that matches an ACL rule with the `allow` action. The field supports `alert`, `warning`, `notice`, `info`, or `debug` values.
`pass`	A `pass` action applies to an admin network policy’s ACL rule. A `pass` action allows either the network policy in the namespace or the baseline admin network policy rule to evaluate all incoming and outgoing traffic. A network policy does not support a `pass` action.

25.9.2. Audit configuration

The configuration for audit logging is specified as part of the OVN-Kubernetes cluster network provider configuration. The following YAML illustrates the default values for the audit logging:

Audit logging configuration

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  defaultNetwork:
    ovnKubernetesConfig:
      policyAuditConfig:
        destination: "null"
        maxFileSize: 50
        rateLimit: 20
        syslogFacility: local0

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  defaultNetwork:
    ovnKubernetesConfig:
      policyAuditConfig:
        destination: "null"
        maxFileSize: 50
        rateLimit: 20
        syslogFacility: local0

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The following table describes the configuration fields for audit logging.

Table 25.11. policyAuditConfig object
Field	Type	Description
`rateLimit`	integer	The maximum number of messages to generate every second per node. The default value is `20` messages per second.
`maxFileSize`	integer	The maximum size for the audit log in bytes. The default value is `50000000` or 50 MB.
`maxLogFiles`	integer	The maximum number of log files that are retained.
`destination`	string	One of the following additional audit log targets: `libc` The libc `syslog()` function of the journald process on the host. `udp:<host>:<port>` A syslog server. Replace `<host>:<port>` with the host and port of the syslog server. `unix:<file>` A Unix Domain Socket file specified by `<file>`. `null` Do not send the audit logs to any additional target.
`syslogFacility`	string	The syslog facility, such as `kern`, as defined by RFC5424. The default value is `local0`.

25.9.3. Configuring egress firewall and network policy auditing for a cluster

As a cluster administrator, you can customize audit logging for your cluster.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster with a user with cluster-admin privileges.

Procedure

To customize the audit logging configuration, enter the following command:

oc edit network.operator.openshift.io/cluster

$ oc edit network.operator.openshift.io/cluster

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Tip

You can alternatively customize and apply the following YAML to configure audit logging:

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  defaultNetwork:
    ovnKubernetesConfig:
      policyAuditConfig:
        destination: "null"
        maxFileSize: 50
        rateLimit: 20
        syslogFacility: local0

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  defaultNetwork:
    ovnKubernetesConfig:
      policyAuditConfig:
        destination: "null"
        maxFileSize: 50
        rateLimit: 20
        syslogFacility: local0

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Verification

To create a namespace with network policies complete the following steps:

Create a namespace for verification:

cat <<EOF| oc create -f -
kind: Namespace
apiVersion: v1
metadata:
  name: verify-audit-logging
  annotations:
    k8s.ovn.org/acl-logging: '{ "deny": "alert", "allow": "alert" }'
EOF

$ cat <<EOF| oc create -f -
kind: Namespace
apiVersion: v1
metadata:
  name: verify-audit-logging
  annotations:
    k8s.ovn.org/acl-logging: '{ "deny": "alert", "allow": "alert" }'
EOF

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Example output

namespace/verify-audit-logging created

namespace/verify-audit-logging created

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Create network policies for the namespace:

cat <<EOF| oc create -n verify-audit-logging -f -
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: deny-all
spec:
  podSelector:
    matchLabels:
  policyTypes:
  - Ingress
  - Egress
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-same-namespace
  namespace: verify-audit-logging
spec:
  podSelector: {}
  policyTypes:
   - Ingress
   - Egress
  ingress:
    - from:
        - podSelector: {}
  egress:
    - to:
       - namespaceSelector:
          matchLabels:
            kubernetes.io/metadata.name: verify-audit-logging
EOF

$ cat <<EOF| oc create -n verify-audit-logging -f -
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: deny-all
spec:
  podSelector:
    matchLabels:
  policyTypes:
  - Ingress
  - Egress
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-from-same-namespace
  namespace: verify-audit-logging
spec:
  podSelector: {}
  policyTypes:
   - Ingress
   - Egress
  ingress:
    - from:
        - podSelector: {}
  egress:
    - to:
       - namespaceSelector:
          matchLabels:
            kubernetes.io/metadata.name: verify-audit-logging
EOF

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Example output

networkpolicy.networking.k8s.io/deny-all created
networkpolicy.networking.k8s.io/allow-from-same-namespace created

networkpolicy.networking.k8s.io/deny-all created
networkpolicy.networking.k8s.io/allow-from-same-namespace created

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Create a pod for source traffic in the default namespace:

cat <<EOF| oc create -n default -f -
apiVersion: v1
kind: Pod
metadata:
  name: client
spec:
  containers:
    - name: client
      image: registry.access.redhat.com/rhel7/rhel-tools
      command: ["/bin/sh", "-c"]
      args:
        ["sleep inf"]
EOF

$ cat <<EOF| oc create -n default -f -
apiVersion: v1
kind: Pod
metadata:
  name: client
spec:
  containers:
    - name: client
      image: registry.access.redhat.com/rhel7/rhel-tools
      command: ["/bin/sh", "-c"]
      args:
        ["sleep inf"]
EOF

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Create two pods in the verify-audit-logging namespace:

for name in client server; do

$ for name in client server; do
cat <<EOF| oc create -n verify-audit-logging -f -
apiVersion: v1
kind: Pod
metadata:
  name: ${name}
spec:
  containers:
    - name: ${name}
      image: registry.access.redhat.com/rhel7/rhel-tools
      command: ["/bin/sh", "-c"]
      args:
        ["sleep inf"]
EOF
done

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Example output

pod/client created
pod/server created

pod/client created
pod/server created

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To generate traffic and produce network policy audit log entries, complete the following steps:

Obtain the IP address for pod named server in the verify-audit-logging namespace:

POD_IP=$(oc get pods server -n verify-audit-logging -o jsonpath='{.status.podIP}')

$ POD_IP=$(oc get pods server -n verify-audit-logging -o jsonpath='{.status.podIP}')

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Ping the IP address from the previous command from the pod named client in the default namespace and confirm that all packets are dropped:

oc exec -it client -n default -- /bin/ping -c 2 $POD_IP

$ oc exec -it client -n default -- /bin/ping -c 2 $POD_IP

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Example output

PING 10.128.2.55 (10.128.2.55) 56(84) bytes of data.

--- 10.128.2.55 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 2041ms

PING 10.128.2.55 (10.128.2.55) 56(84) bytes of data.

--- 10.128.2.55 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 2041ms

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Ping the IP address saved in the POD_IP shell environment variable from the pod named client in the verify-audit-logging namespace and confirm that all packets are allowed:

oc exec -it client -n verify-audit-logging -- /bin/ping -c 2 $POD_IP

$ oc exec -it client -n verify-audit-logging -- /bin/ping -c 2 $POD_IP

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Example output

PING 10.128.0.86 (10.128.0.86) 56(84) bytes of data.
64 bytes from 10.128.0.86: icmp_seq=1 ttl=64 time=2.21 ms
64 bytes from 10.128.0.86: icmp_seq=2 ttl=64 time=0.440 ms

--- 10.128.0.86 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 0.440/1.329/2.219/0.890 ms

PING 10.128.0.86 (10.128.0.86) 56(84) bytes of data.
64 bytes from 10.128.0.86: icmp_seq=1 ttl=64 time=2.21 ms
64 bytes from 10.128.0.86: icmp_seq=2 ttl=64 time=0.440 ms

--- 10.128.0.86 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 0.440/1.329/2.219/0.890 ms

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Display the latest entries in the network policy audit log:

for pod in $(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-node --no-headers=true | awk '{ print $1 }') ; do

$ for pod in $(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-node --no-headers=true | awk '{ print $1 }') ; do
    oc exec -it $pod -n openshift-ovn-kubernetes -- tail -4 /var/log/ovn/acl-audit-log.log
  done

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Example output

Defaulting container name to ovn-controller.
Use 'oc describe pod/ovnkube-node-hdb8v -n openshift-ovn-kubernetes' to see all of the containers in this pod.
2021-06-13T19:33:11.590Z|00005|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:33:12.614Z|00006|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:10.037Z|00007|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:11.037Z|00008|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0

Defaulting container name to ovn-controller.
Use 'oc describe pod/ovnkube-node-hdb8v -n openshift-ovn-kubernetes' to see all of the containers in this pod.
2021-06-13T19:33:11.590Z|00005|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:33:12.614Z|00006|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:10.037Z|00007|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:11.037Z|00008|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0

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25.9.4. Enabling egress firewall and network policy audit logging for a namespace

As a cluster administrator, you can enable audit logging for a namespace.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster with a user with cluster-admin privileges.

Procedure

To enable audit logging for a namespace, enter the following command:

oc annotate namespace <namespace> \
  k8s.ovn.org/acl-logging='{ "deny": "alert", "allow": "notice" }'

$ oc annotate namespace <namespace> \
  k8s.ovn.org/acl-logging='{ "deny": "alert", "allow": "notice" }'

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where:

<namespace>: Specifies the name of the namespace.

Tip

You can alternatively apply the following YAML to enable audit logging:

kind: Namespace
apiVersion: v1
metadata:
  name: <namespace>
  annotations:
    k8s.ovn.org/acl-logging: |-
      {
        "deny": "alert",
        "allow": "notice"
      }

kind: Namespace
apiVersion: v1
metadata:
  name: <namespace>
  annotations:
    k8s.ovn.org/acl-logging: |-
      {
        "deny": "alert",
        "allow": "notice"
      }

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Example output

namespace/verify-audit-logging annotated

namespace/verify-audit-logging annotated

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Verification

Display the latest entries in the audit log:

for pod in $(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-node --no-headers=true | awk '{ print $1 }') ; do

$ for pod in $(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-node --no-headers=true | awk '{ print $1 }') ; do
    oc exec -it $pod -n openshift-ovn-kubernetes -- tail -4 /var/log/ovn/acl-audit-log.log
  done

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Example output

Defaulting container name to ovn-controller.
Use 'oc describe pod/ovnkube-node-hdb8v -n openshift-ovn-kubernetes' to see all of the containers in this pod.
2021-06-13T19:33:11.590Z|00005|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:33:12.614Z|00006|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:10.037Z|00007|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:11.037Z|00008|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0

Defaulting container name to ovn-controller.
Use 'oc describe pod/ovnkube-node-hdb8v -n openshift-ovn-kubernetes' to see all of the containers in this pod.
2021-06-13T19:33:11.590Z|00005|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:33:12.614Z|00006|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_ingressDefaultDeny", verdict=drop, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:39,dl_dst=0a:58:0a:80:02:37,nw_src=10.128.2.57,nw_dst=10.128.2.55,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:10.037Z|00007|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0
2021-06-13T19:44:11.037Z|00008|acl_log(ovn_pinctrl0)|INFO|name="verify-audit-logging_allow-from-same-namespace_0", verdict=allow, severity=alert: icmp,vlan_tci=0x0000,dl_src=0a:58:0a:80:02:3b,dl_dst=0a:58:0a:80:02:3a,nw_src=10.128.2.59,nw_dst=10.128.2.58,nw_tos=0,nw_ecn=0,nw_ttl=64,icmp_type=8,icmp_code=0

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25.9.5. Disabling egress firewall and network policy audit logging for a namespace

As a cluster administrator, you can disable audit logging for a namespace.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster with a user with cluster-admin privileges.

Procedure

To disable audit logging for a namespace, enter the following command:

oc annotate --overwrite namespace <namespace> k8s.ovn.org/acl-logging-

$ oc annotate --overwrite namespace <namespace> k8s.ovn.org/acl-logging-

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where:

<namespace>: Specifies the name of the namespace.

Tip

You can alternatively apply the following YAML to disable audit logging:

kind: Namespace
apiVersion: v1
metadata:
  name: <namespace>
  annotations:
    k8s.ovn.org/acl-logging: null

kind: Namespace
apiVersion: v1
metadata:
  name: <namespace>
  annotations:
    k8s.ovn.org/acl-logging: null

Copy to Clipboard

Example output

namespace/verify-audit-logging annotated

namespace/verify-audit-logging annotated

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25.10. Configuring IPsec encryption

With IPsec enabled, all pod-to-pod network traffic between nodes on the OVN-Kubernetes cluster network is encrypted with IPsec Transport mode.

IPsec is disabled by default. It can be enabled either during or after installing the cluster. For information about cluster installation, see OpenShift Container Platform installation overview. If you need to enable IPsec after cluster installation, you must first resize your cluster MTU to account for the overhead of the IPsec ESP IP header.

The following support limitations exist for IPsec on a OpenShift Container Platform cluster:

You must disable IPsec before updating to OpenShift Container Platform 4.15. After disabling IPsec, you must also delete the associated IPsec daemonsets. There is a known issue that can cause interruptions in pod-to-pod communication if you update without disabling IPsec. (OCPBUGS-43323)

The following documentation describes how to enable and disable IPSec after cluster installation.

25.10.1. Prerequisites

You have decreased the size of the cluster MTU by 46 bytes to allow for the additional overhead of the IPsec ESP header. For more information on resizing the MTU that your cluster uses, see Changing the MTU for the cluster network.

25.10.2. Types of network traffic flows encrypted by IPsec

With IPsec enabled, only the following network traffic flows between pods are encrypted:

Traffic between pods on different nodes on the cluster network
Traffic from a pod on the host network to a pod on the cluster network

The following traffic flows are not encrypted:

Traffic between pods on the same node on the cluster network
Traffic between pods on the host network
Traffic from a pod on the cluster network to a pod on the host network

The encrypted and unencrypted flows are illustrated in the following diagram:

IPsec encrypted and unencrypted traffic flows

25.10.2.1. Network connectivity requirements when IPsec is enabled

You must configure the network connectivity between machines to allow OpenShift Container Platform cluster components to communicate. Each machine must be able to resolve the hostnames of all other machines in the cluster.

Table 25.12. Ports used for all-machine to all-machine communications
Protocol	Port	Description
UDP	`500`	IPsec IKE packets
UDP	`4500`	IPsec NAT-T packets
ESP	N/A	IPsec Encapsulating Security Payload (ESP)

25.10.3. Encryption protocol and IPsec mode

The encrypt cipher used is AES-GCM-16-256. The integrity check value (ICV) is 16 bytes. The key length is 256 bits.

The IPsec mode used is Transport mode, a mode that encrypts end-to-end communication by adding an Encapsulated Security Payload (ESP) header to the IP header of the original packet and encrypts the packet data. OpenShift Container Platform does not currently use or support IPsec Tunnel mode for pod-to-pod communication.

25.10.4. Security certificate generation and rotation

The Cluster Network Operator (CNO) generates a self-signed X.509 certificate authority (CA) that is used by IPsec for encryption. Certificate signing requests (CSRs) from each node are automatically fulfilled by the CNO.

The CA is valid for 10 years. The individual node certificates are valid for 5 years and are automatically rotated after 4 1/2 years elapse.

25.10.5. Enabling IPsec encryption

As a cluster administrator, you can enable IPsec encryption after cluster installation.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster as a user with cluster-admin privileges.
You have reduced the size of your cluster maximum transmission unit (MTU) by 46 bytes to allow for the overhead of the IPsec ESP header.

Procedure

To enable IPsec encryption, enter the following command:

oc patch networks.operator.openshift.io cluster --type=merge \
-p '{"spec":{"defaultNetwork":{"ovnKubernetesConfig":{"ipsecConfig":{ }}}}}'

$ oc patch networks.operator.openshift.io cluster --type=merge \
-p '{"spec":{"defaultNetwork":{"ovnKubernetesConfig":{"ipsecConfig":{ }}}}}'

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Verification

To find the names of the OVN-Kubernetes control plane pods, enter the following command:

oc get pods -l app=ovnkube-master -n openshift-ovn-kubernetes

$ oc get pods -l app=ovnkube-master -n openshift-ovn-kubernetes

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Example output

NAME                   READY   STATUS    RESTARTS   AGE
ovnkube-master-fvtnh   6/6     Running   0          122m
ovnkube-master-hsgmm   6/6     Running   0          122m
ovnkube-master-qcmdc   6/6     Running   0          122m

NAME                   READY   STATUS    RESTARTS   AGE
ovnkube-master-fvtnh   6/6     Running   0          122m
ovnkube-master-hsgmm   6/6     Running   0          122m
ovnkube-master-qcmdc   6/6     Running   0          122m

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Verify that IPsec is enabled on your cluster by entering the following command. The command output must state true to indicate that the node has IPsec enabled.
```
oc -n openshift-ovn-kubernetes rsh ovnkube-master-<pod_number_sequence> \
  ovn-nbctl --no-leader-only get nb_global . ipsec
```
```
$ oc -n openshift-ovn-kubernetes rsh ovnkube-master-<pod_number_sequence> \ 
```
1
```
  ovn-nbctl --no-leader-only get nb_global . ipsec
```
Copy to Clipboard
1
Replace <pod_number_sequence> with the random sequence of letters, fvtnh, for a data plane pod from the previous step.

25.10.6. Disabling IPsec encryption

As a cluster administrator, you can disable IPsec encryption only if you enabled IPsec after cluster installation.

Important

After disabling IPsec, you must delete the associated IPsec daemonsets pods. If you do not delete these pods, you might experience issues with your cluster.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster with a user with cluster-admin privileges.

Procedure

To disable IPsec encryption, enter the following command:

oc patch networks.operator.openshift.io/cluster --type=json \
  -p='[{"op":"remove", "path":"/spec/defaultNetwork/ovnKubernetesConfig/ipsecConfig"}]'

$ oc patch networks.operator.openshift.io/cluster --type=json \
  -p='[{"op":"remove", "path":"/spec/defaultNetwork/ovnKubernetesConfig/ipsecConfig"}]'

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To find the name of the OVN-Kubernetes data plane pod that exists on the master node in your cluster, enter the following command:

oc get pods -n openshift-ovn-kubernetes -l=app=ovnkube-master

$ oc get pods -n openshift-ovn-kubernetes -l=app=ovnkube-master

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Example output

ovnkube-master-5xqbf                      8/8     Running   0              28m
...

ovnkube-master-5xqbf                      8/8     Running   0              28m
...

Copy to Clipboard

Verify that the master node in your cluster has IPsec disabled by entering the following command. The command output must state false to indicate that the node has IPsec disabled.
```
oc -n openshift-ovn-kubernetes -c nbdb rsh ovnkube-master-<pod_number_sequence> \
  ovn-nbctl --no-leader-only get nb_global . ipsec
```
```
$ oc -n openshift-ovn-kubernetes -c nbdb rsh ovnkube-master-<pod_number_sequence> \
```
1
```
  ovn-nbctl --no-leader-only get nb_global . ipsec
```
Copy to Clipboard
1
Replace <pod_number_sequence> with the random sequence of letters, such as 5xqbf, for the data plane pod from the previous step.
To remove the IPsec ovn-ipsec daemonset pod from the openshift-ovn-kubernetes namespace on the node, enter the following command:
```
oc delete daemonset ovn-ipsec -n openshift-ovn-kubernetes
```
```
$ oc delete daemonset ovn-ipsec -n openshift-ovn-kubernetes 
```
1
Copy to Clipboard
1
The ovn-ipsec daemonset configures IPsec connections for east-west traffic on the node.
Verify that the ovn-ipsec daemonset pod was removed from the all nodes in your cluster by entering the following command. If the command output does not list the pod, the removal operation is successful.
```
oc get pods -n openshift-ovn-kubernetes -l=app=ovn-ipsec
```
```
$ oc get pods -n openshift-ovn-kubernetes -l=app=ovn-ipsec
```
Copy to Clipboard
Note
You might need to re-run the command for deleting the pod because sometimes the initial command attempt might not delete the pod.
Optional: You can increase the size of your cluster MTU by 46 bytes because there is no longer any overhead from the IPsec ESP header in IP packets.

25.10.7. Additional resources

About the OVN-Kubernetes Container Network Interface (CNI) network plugin
Changing the MTU for the cluster network
Network [operator.openshift.io/v1] API

25.11. Configuring an egress firewall for a project

As a cluster administrator, you can create an egress firewall for a project that restricts egress traffic leaving your OpenShift Container Platform cluster.

25.11.1. How an egress firewall works in a project

As a cluster administrator, you can use an egress firewall to limit the external hosts that some or all pods can access from within the cluster. An egress firewall supports the following scenarios:

A pod can only connect to internal hosts and cannot initiate connections to the public internet.
A pod can only connect to the public internet and cannot initiate connections to internal hosts that are outside the OpenShift Container Platform cluster.
A pod cannot reach specified internal subnets or hosts outside the OpenShift Container Platform cluster.
A pod can connect to only specific external hosts.

For example, you can allow one project access to a specified IP range but deny the same access to a different project. Or you can restrict application developers from updating from Python pip mirrors, and force updates to come only from approved sources.

Note

Egress firewall does not apply to the host network namespace. Pods with host networking enabled are unaffected by egress firewall rules.

You configure an egress firewall policy by creating an EgressFirewall custom resource (CR) object. The egress firewall matches network traffic that meets any of the following criteria:

An IP address range in CIDR format
A DNS name that resolves to an IP address
A port number
A protocol that is one of the following protocols: TCP, UDP, and SCTP

Important

If your egress firewall includes a deny rule for 0.0.0.0/0, access to your OpenShift Container Platform API servers is blocked. You must either add allow rules for each IP address or use the nodeSelector type allow rule in your egress policy rules to connect to API servers.

The following example illustrates the order of the egress firewall rules necessary to ensure API server access:

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: default
  namespace: <namespace> 
spec:
  egress:
  - to:
      cidrSelector: <api_server_address_range> 
    type: Allow
# ...
  - to:
      cidrSelector: 0.0.0.0/0 
    type: Deny

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: default
  namespace: <namespace>

1


spec:
  egress:
  - to:
      cidrSelector: <api_server_address_range>

2


    type: Allow
# ...
  - to:
      cidrSelector: 0.0.0.0/0

3


    type: Deny

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1: The namespace for the egress firewall.
2: The IP address range that includes your OpenShift Container Platform API servers.
3: A global deny rule prevents access to the OpenShift Container Platform API servers.

To find the IP address for your API servers, run oc get ep kubernetes -n default.

For more information, see BZ#1988324.

Warning

Egress firewall rules do not apply to traffic that goes through routers. Any user with permission to create a Route CR object can bypass egress firewall policy rules by creating a route that points to a forbidden destination.

25.11.1.1. Limitations of an egress firewall

An egress firewall has the following limitations:

No project can have more than one EgressFirewall object.
A maximum of one EgressFirewall object with a maximum of 8,000 rules can be defined per project.
If you are using the OVN-Kubernetes network plugin with shared gateway mode in Red Hat OpenShift Networking, return ingress replies are affected by egress firewall rules. If the egress firewall rules drop the ingress reply destination IP, the traffic is dropped.

Violating any of these restrictions results in a broken egress firewall for the project. Consequently, all external network traffic is dropped, which can cause security risks for your organization.

An Egress Firewall resource can be created in the kube-node-lease, kube-public, kube-system, openshift and openshift- projects.

25.11.1.2. Matching order for egress firewall policy rules

The egress firewall policy rules are evaluated in the order that they are defined, from first to last. The first rule that matches an egress connection from a pod applies. Any subsequent rules are ignored for that connection.

25.11.1.3. How Domain Name Server (DNS) resolution works

If you use DNS names in any of your egress firewall policy rules, proper resolution of the domain names is subject to the following restrictions:

Domain name updates are polled based on a time-to-live (TTL) duration. By default, the duration is 30 minutes. When the egress firewall controller queries the local name servers for a domain name, if the response includes a TTL and the TTL is less than 30 minutes, the controller sets the duration for that DNS name to the returned value. Each DNS name is queried after the TTL for the DNS record expires.
The pod must resolve the domain from the same local name servers when necessary. Otherwise the IP addresses for the domain known by the egress firewall controller and the pod can be different. If the IP addresses for a hostname differ, the egress firewall might not be enforced consistently.
Because the egress firewall controller and pods asynchronously poll the same local name server, the pod might obtain the updated IP address before the egress controller does, which causes a race condition. Due to this current limitation, domain name usage in EgressFirewall objects is only recommended for domains with infrequent IP address changes.

Note

Using DNS names in your egress firewall policy does not affect local DNS resolution through CoreDNS.

However, if your egress firewall policy uses domain names, and an external DNS server handles DNS resolution for an affected pod, you must include egress firewall rules that permit access to the IP addresses of your DNS server.

25.11.2. EgressFirewall custom resource (CR) object

You can define one or more rules for an egress firewall. A rule is either an Allow rule or a Deny rule, with a specification for the traffic that the rule applies to.

The following YAML describes an EgressFirewall CR object:

EgressFirewall object

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: <name> 
spec:
  egress: 
    ...

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: <name>

1


spec:
  egress:

2

...

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1: The name for the object must be default.
2: A collection of one or more egress network policy rules as described in the following section.

25.11.2.1. EgressFirewall rules

The following YAML describes an egress firewall rule object. The user can select either an IP address range in CIDR format, a domain name, or use the nodeSelector to allow or deny egress traffic. The egress stanza expects an array of one or more objects.

Egress policy rule stanza

egress:
- type: <type> 
  to: 
    cidrSelector: <cidr> 
    dnsName: <dns_name> 
    nodeSelector: <label_name>: <label_value> 
  ports: 
      ...

egress:
- type: <type>

1

to:

2


    cidrSelector: <cidr>

3


    dnsName: <dns_name>

4


    nodeSelector: <label_name>: <label_value>

5


  ports:

6

...

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1: The type of rule. The value must be either Allow or Deny.
2: A stanza describing an egress traffic match rule that specifies the cidrSelector field or the dnsName field. You cannot use both fields in the same rule.
3: An IP address range in CIDR format.
4: A DNS domain name.
5: Labels are key/value pairs that the user defines. Labels are attached to objects, such as pods. The nodeSelector allows for one or more node labels to be selected and attached to pods.
6: Optional: A stanza describing a collection of network ports and protocols for the rule.

Ports stanza

ports:
- port: <port> 
  protocol: <protocol>

ports:
- port: <port>

1


  protocol: <protocol>

2

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1: A network port, such as 80 or 443. If you specify a value for this field, you must also specify a value for protocol.
2: A network protocol. The value must be either TCP, UDP, or SCTP.

25.11.2.2. Example EgressFirewall CR objects

The following example defines several egress firewall policy rules:

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: default
spec:
  egress: 
  - type: Allow
    to:
      cidrSelector: 1.2.3.0/24
  - type: Deny
    to:
      cidrSelector: 0.0.0.0/0

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: default
spec:
  egress:

1


  - type: Allow
    to:
      cidrSelector: 1.2.3.0/24
  - type: Deny
    to:
      cidrSelector: 0.0.0.0/0

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1: A collection of egress firewall policy rule objects.

The following example defines a policy rule that denies traffic to the host at the 172.16.1.1/32 IP address, if the traffic is using either the TCP protocol and destination port 80 or any protocol and destination port 443.

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: default
spec:
  egress:
  - type: Deny
    to:
      cidrSelector: 172.16.1.1/32
    ports:
    - port: 80
      protocol: TCP
    - port: 443

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: default
spec:
  egress:
  - type: Deny
    to:
      cidrSelector: 172.16.1.1/32
    ports:
    - port: 80
      protocol: TCP
    - port: 443

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25.11.2.3. Example nodeSelector for EgressFirewall

As a cluster administrator, you can allow or deny egress traffic to nodes in your cluster by specifying a label using nodeSelector. Labels can be applied to one or more nodes. The following is an example with the region=east label:

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: default
spec:
    egress:
    - to:
        nodeSelector:
          matchLabels:
            region: east
      type: Allow

apiVersion: k8s.ovn.org/v1
kind: EgressFirewall
metadata:
  name: default
spec:
    egress:
    - to:
        nodeSelector:
          matchLabels:
            region: east
      type: Allow

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Tip

Instead of adding manual rules per node IP address, use node selectors to create a label that allows pods behind an egress firewall to access host network pods.

25.11.3. Creating an egress firewall policy object

As a cluster administrator, you can create an egress firewall policy object for a project.

Important

If the project already has an EgressFirewall object defined, you must edit the existing policy to make changes to the egress firewall rules.

Prerequisites

A cluster that uses the OVN-Kubernetes network plugin.
Install the OpenShift CLI (oc).
You must log in to the cluster as a cluster administrator.

Procedure

Create a policy rule:
1. Create a <policy_name>.yaml file where <policy_name> describes the egress policy rules.
2. In the file you created, define an egress policy object.
Enter the following command to create the policy object. Replace <policy_name> with the name of the policy and <project> with the project that the rule applies to.
```
oc create -f <policy_name>.yaml -n <project>
```
```
$ oc create -f <policy_name>.yaml -n <project>
```
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In the following example, a new EgressFirewall object is created in a project named project1:
```
oc create -f default.yaml -n project1
```
```
$ oc create -f default.yaml -n project1
```
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Example output
```
egressfirewall.k8s.ovn.org/v1 created
```
```
egressfirewall.k8s.ovn.org/v1 created
```
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Optional: Save the <policy_name>.yaml file so that you can make changes later.

25.12. Viewing an egress firewall for a project

As a cluster administrator, you can list the names of any existing egress firewalls and view the traffic rules for a specific egress firewall.

25.12.1. Viewing an EgressFirewall object

You can view an EgressFirewall object in your cluster.

Prerequisites

A cluster using the OVN-Kubernetes network plugin.
Install the OpenShift Command-line Interface (CLI), commonly known as oc.
You must log in to the cluster.

Procedure

Optional: To view the names of the EgressFirewall objects defined in your cluster, enter the following command:
```
oc get egressfirewall --all-namespaces
```
```
$ oc get egressfirewall --all-namespaces
```
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To inspect a policy, enter the following command. Replace <policy_name> with the name of the policy to inspect.

oc describe egressfirewall <policy_name>

$ oc describe egressfirewall <policy_name>

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Example output

Name:		default
Namespace:	project1
Created:	20 minutes ago
Labels:		<none>
Annotations:	<none>
Rule:		Allow to 1.2.3.0/24
Rule:		Allow to www.example.com
Rule:		Deny to 0.0.0.0/0

Name:		default
Namespace:	project1
Created:	20 minutes ago
Labels:		<none>
Annotations:	<none>
Rule:		Allow to 1.2.3.0/24
Rule:		Allow to www.example.com
Rule:		Deny to 0.0.0.0/0

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25.13. Editing an egress firewall for a project

As a cluster administrator, you can modify network traffic rules for an existing egress firewall.

25.13.1. Editing an EgressFirewall object

As a cluster administrator, you can update the egress firewall for a project.

Prerequisites

A cluster using the OVN-Kubernetes network plugin.
Install the OpenShift CLI (oc).
You must log in to the cluster as a cluster administrator.

Procedure

Find the name of the EgressFirewall object for the project. Replace <project> with the name of the project.
```
oc get -n <project> egressfirewall
```
```
$ oc get -n <project> egressfirewall
```
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Optional: If you did not save a copy of the EgressFirewall object when you created the egress network firewall, enter the following command to create a copy.
```
oc get -n <project> egressfirewall <name> -o yaml > <filename>.yaml
```
```
$ oc get -n <project> egressfirewall <name> -o yaml > <filename>.yaml
```
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Replace <project> with the name of the project. Replace <name> with the name of the object. Replace <filename> with the name of the file to save the YAML to.
After making changes to the policy rules, enter the following command to replace the EgressFirewall object. Replace <filename> with the name of the file containing the updated EgressFirewall object.
```
oc replace -f <filename>.yaml
```
```
$ oc replace -f <filename>.yaml
```
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25.14. Removing an egress firewall from a project

As a cluster administrator, you can remove an egress firewall from a project to remove all restrictions on network traffic from the project that leaves the OpenShift Container Platform cluster.

25.14.1. Removing an EgressFirewall object

As a cluster administrator, you can remove an egress firewall from a project.

Prerequisites

A cluster using the OVN-Kubernetes network plugin.
Install the OpenShift CLI (oc).
You must log in to the cluster as a cluster administrator.

Procedure

Find the name of the EgressFirewall object for the project. Replace <project> with the name of the project.
```
oc get -n <project> egressfirewall
```
```
$ oc get -n <project> egressfirewall
```
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Enter the following command to delete the EgressFirewall object. Replace <project> with the name of the project and <name> with the name of the object.
```
oc delete -n <project> egressfirewall <name>
```
```
$ oc delete -n <project> egressfirewall <name>
```
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25.15. Configuring an egress IP address

As a cluster administrator, you can configure the OVN-Kubernetes Container Network Interface (CNI) network plugin to assign one or more egress IP addresses to a namespace, or to specific pods in a namespace.

Important

In an installer-provisioned infrastructure cluster, do not assign egress IP addresses to the infrastructure node that already hosts the ingress VIP. For more information, see the Red Hat Knowledgebase solution POD from the egress IP enabled namespace cannot access OCP route in an IPI cluster when the egress IP is assigned to the infra node that already hosts the ingress VIP.

25.15.1. Egress IP address architectural design and implementation

The OpenShift Container Platform egress IP address functionality allows you to ensure that the traffic from one or more pods in one or more namespaces has a consistent source IP address for services outside the cluster network.

For example, you might have a pod that periodically queries a database that is hosted on a server outside of your cluster. To enforce access requirements for the server, a packet filtering device is configured to allow traffic only from specific IP addresses. To ensure that you can reliably allow access to the server from only that specific pod, you can configure a specific egress IP address for the pod that makes the requests to the server.

An egress IP address assigned to a namespace is different from an egress router, which is used to send traffic to specific destinations.

In some cluster configurations, application pods and ingress router pods run on the same node. If you configure an egress IP address for an application project in this scenario, the IP address is not used when you send a request to a route from the application project.

Important

Egress IP addresses must not be configured in any Linux network configuration files, such as ifcfg-eth0.

25.15.1.1. Platform support

Support for the egress IP address functionality on various platforms is summarized in the following table:

Platform	Supported
Bare metal	Yes
VMware vSphere	Yes
Red Hat OpenStack Platform (RHOSP)	Yes
Amazon Web Services (AWS)	Yes
Google Cloud Platform (GCP)	Yes
Microsoft Azure	Yes
IBM Z and IBM® LinuxONE	Yes
IBM Z and IBM® LinuxONE for Red Hat Enterprise Linux (RHEL) KVM	Yes
IBM Power	Yes

Important

The assignment of egress IP addresses to control plane nodes with the EgressIP feature is not supported on a cluster provisioned on Amazon Web Services (AWS). (BZ#2039656)

25.15.1.2. Public cloud platform considerations

Typically, public cloud providers place a limit on egress IPs. This means that there is a constraint on the absolute number of assignable IP addresses per node for clusters provisioned on public cloud infrastructure. The maximum number of assignable IP addresses per node, or the IP capacity, can be described in the following formula:

IP capacity = public cloud default capacity - sum(current IP assignments)

IP capacity = public cloud default capacity - sum(current IP assignments)

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While the Egress IPs capability manages the IP address capacity per node, it is important to plan for this constraint in your deployments. For example, if a public cloud provider limits IP address capacity to 10 IP addresses per node, and you have 8 nodes, the total number of assignable IP addresses is only 80. To achieve a higher IP address capacity, you would need to allocate additional nodes. For example, if you needed 150 assignable IP addresses, you would need to allocate 7 additional nodes.

To confirm the IP capacity and subnets for any node in your public cloud environment, you can enter the oc get node <node_name> -o yaml command. The cloud.network.openshift.io/egress-ipconfig annotation includes capacity and subnet information for the node.

The annotation value is an array with a single object with fields that provide the following information for the primary network interface:

interface: Specifies the interface ID on AWS and Azure and the interface name on GCP.
ifaddr: Specifies the subnet mask for one or both IP address families.
capacity: Specifies the IP address capacity for the node. On AWS, the IP address capacity is provided per IP address family. On Azure and GCP, the IP address capacity includes both IPv4 and IPv6 addresses.

Automatic attachment and detachment of egress IP addresses for traffic between nodes are available. This allows for traffic from many pods in namespaces to have a consistent source IP address to locations outside of the cluster. This also supports OpenShift SDN and OVN-Kubernetes, which is the default networking plugin in Red Hat OpenShift Networking in OpenShift Container Platform 4.13.

Note

When an RHOSP cluster administrator assigns a floating IP to the reservation port, OpenShift Container Platform cannot delete the reservation port. The CloudPrivateIPConfig object cannot perform delete and move operations until an RHOSP cluster administrator unassigns the floating IP from the reservation port.

The following examples illustrate the annotation from nodes on several public cloud providers. The annotations are indented for readability.

Example cloud.network.openshift.io/egress-ipconfig annotation on AWS

cloud.network.openshift.io/egress-ipconfig: [
  {
    "interface":"eni-078d267045138e436",
    "ifaddr":{"ipv4":"10.0.128.0/18"},
    "capacity":{"ipv4":14,"ipv6":15}
  }
]

cloud.network.openshift.io/egress-ipconfig: [
  {
    "interface":"eni-078d267045138e436",
    "ifaddr":{"ipv4":"10.0.128.0/18"},
    "capacity":{"ipv4":14,"ipv6":15}
  }
]

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Example cloud.network.openshift.io/egress-ipconfig annotation on GCP

cloud.network.openshift.io/egress-ipconfig: [
  {
    "interface":"nic0",
    "ifaddr":{"ipv4":"10.0.128.0/18"},
    "capacity":{"ip":14}
  }
]

cloud.network.openshift.io/egress-ipconfig: [
  {
    "interface":"nic0",
    "ifaddr":{"ipv4":"10.0.128.0/18"},
    "capacity":{"ip":14}
  }
]

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The following sections describe the IP address capacity for supported public cloud environments for use in your capacity calculation.

25.15.1.2.1. Amazon Web Services (AWS) IP address capacity limits

On AWS, constraints on IP address assignments depend on the instance type configured. For more information, see IP addresses per network interface per instance type

25.15.1.2.2. Google Cloud Platform (GCP) IP address capacity limits

On GCP, the networking model implements additional node IP addresses through IP address aliasing, rather than IP address assignments. However, IP address capacity maps directly to IP aliasing capacity.

The following capacity limits exist for IP aliasing assignment:

Per node, the maximum number of IP aliases, both IPv4 and IPv6, is 100.
Per VPC, the maximum number of IP aliases is unspecified, but OpenShift Container Platform scalability testing reveals the maximum to be approximately 15,000.

For more information, see Per instance quotas and Alias IP ranges overview.

25.15.1.2.3. Microsoft Azure IP address capacity limits

On Azure, the following capacity limits exist for IP address assignment:

Per NIC, the maximum number of assignable IP addresses, for both IPv4 and IPv6, is 256.
Per virtual network, the maximum number of assigned IP addresses cannot exceed 65,536.

For more information, see Networking limits.

25.15.1.3. Assignment of egress IPs to pods

To assign one or more egress IPs to a namespace or specific pods in a namespace, the following conditions must be satisfied:

At least one node in your cluster must have the k8s.ovn.org/egress-assignable: "" label.
An EgressIP object exists that defines one or more egress IP addresses to use as the source IP address for traffic leaving the cluster from pods in a namespace.

Important

If you create EgressIP objects prior to labeling any nodes in your cluster for egress IP assignment, OpenShift Container Platform might assign every egress IP address to the first node with the k8s.ovn.org/egress-assignable: "" label.

To ensure that egress IP addresses are widely distributed across nodes in the cluster, always apply the label to the nodes you intent to host the egress IP addresses before creating any EgressIP objects.

25.15.1.4. Assignment of egress IPs to nodes

When creating an EgressIP object, the following conditions apply to nodes that are labeled with the k8s.ovn.org/egress-assignable: "" label:

An egress IP address is never assigned to more than one node at a time.
An egress IP address is equally balanced between available nodes that can host the egress IP address.
If the spec.EgressIPs array in an EgressIP object specifies more than one IP address, the following conditions apply:
- No node will ever host more than one of the specified IP addresses.
- Traffic is balanced roughly equally between the specified IP addresses for a given namespace.
If a node becomes unavailable, any egress IP addresses assigned to it are automatically reassigned, subject to the previously described conditions.

When a pod matches the selector for multiple EgressIP objects, there is no guarantee which of the egress IP addresses that are specified in the EgressIP objects is assigned as the egress IP address for the pod.

Additionally, if an EgressIP object specifies multiple egress IP addresses, there is no guarantee which of the egress IP addresses might be used. For example, if a pod matches a selector for an EgressIP object with two egress IP addresses, 10.10.20.1 and 10.10.20.2, either might be used for each TCP connection or UDP conversation.

25.15.1.5. Architectural diagram of an egress IP address configuration

The following diagram depicts an egress IP address configuration. The diagram describes four pods in two different namespaces running on three nodes in a cluster. The nodes are assigned IP addresses from the 192.168.126.0/18 CIDR block on the host network.

Both Node 1 and Node 3 are labeled with k8s.ovn.org/egress-assignable: "" and thus available for the assignment of egress IP addresses.

The dashed lines in the diagram depict the traffic flow from pod1, pod2, and pod3 traveling through the pod network to egress the cluster from Node 1 and Node 3. When an external service receives traffic from any of the pods selected by the example EgressIP object, the source IP address is either 192.168.126.10 or 192.168.126.102. The traffic is balanced roughly equally between these two nodes.

The following resources from the diagram are illustrated in detail:

Namespace objects

The namespaces are defined in the following manifest:

Namespace objects

apiVersion: v1
kind: Namespace
metadata:
  name: namespace1
  labels:
    env: prod
---
apiVersion: v1
kind: Namespace
metadata:
  name: namespace2
  labels:
    env: prod

apiVersion: v1
kind: Namespace
metadata:
  name: namespace1
  labels:
    env: prod
---
apiVersion: v1
kind: Namespace
metadata:
  name: namespace2
  labels:
    env: prod

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EgressIP object

The following EgressIP object describes a configuration that selects all pods in any namespace with the env label set to prod. The egress IP addresses for the selected pods are 192.168.126.10 and 192.168.126.102.

EgressIP object

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: egressips-prod
spec:
  egressIPs:
  - 192.168.126.10
  - 192.168.126.102
  namespaceSelector:
    matchLabels:
      env: prod
status:
  items:
  - node: node1
    egressIP: 192.168.126.10
  - node: node3
    egressIP: 192.168.126.102

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: egressips-prod
spec:
  egressIPs:
  - 192.168.126.10
  - 192.168.126.102
  namespaceSelector:
    matchLabels:
      env: prod
status:
  items:
  - node: node1
    egressIP: 192.168.126.10
  - node: node3
    egressIP: 192.168.126.102

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For the configuration in the previous example, OpenShift Container Platform assigns both egress IP addresses to the available nodes. The status field reflects whether and where the egress IP addresses are assigned.

25.15.2. EgressIP object

The following YAML describes the API for the EgressIP object. The scope of the object is cluster-wide; it is not created in a namespace.

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: <name> 
spec:
  egressIPs: 
  - <ip_address>
  namespaceSelector: 
    ...
  podSelector: 
    ...

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: <name>

1


spec:
  egressIPs:

2


  - <ip_address>
  namespaceSelector:

3


    ...
  podSelector:

4

...

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1: The name for the EgressIPs object.
2: An array of one or more IP addresses.
3: One or more selectors for the namespaces to associate the egress IP addresses with.
4: Optional: One or more selectors for pods in the specified namespaces to associate egress IP addresses with. Applying these selectors allows for the selection of a subset of pods within a namespace.

The following YAML describes the stanza for the namespace selector:

Namespace selector stanza

namespaceSelector: 
  matchLabels:
    <label_name>: <label_value>

namespaceSelector:

1


  matchLabels:
    <label_name>: <label_value>

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1: One or more matching rules for namespaces. If more than one match rule is provided, all matching namespaces are selected.

The following YAML describes the optional stanza for the pod selector:

Pod selector stanza

podSelector: 
  matchLabels:
    <label_name>: <label_value>

podSelector:

1


  matchLabels:
    <label_name>: <label_value>

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1: Optional: One or more matching rules for pods in the namespaces that match the specified namespaceSelector rules. If specified, only pods that match are selected. Others pods in the namespace are not selected.

In the following example, the EgressIP object associates the 192.168.126.11 and 192.168.126.102 egress IP addresses with pods that have the app label set to web and are in the namespaces that have the env label set to prod:

Example EgressIP object

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: egress-group1
spec:
  egressIPs:
  - 192.168.126.11
  - 192.168.126.102
  podSelector:
    matchLabels:
      app: web
  namespaceSelector:
    matchLabels:
      env: prod

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: egress-group1
spec:
  egressIPs:
  - 192.168.126.11
  - 192.168.126.102
  podSelector:
    matchLabels:
      app: web
  namespaceSelector:
    matchLabels:
      env: prod

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In the following example, the EgressIP object associates the 192.168.127.30 and 192.168.127.40 egress IP addresses with any pods that do not have the environment label set to development:

Example EgressIP object

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: egress-group2
spec:
  egressIPs:
  - 192.168.127.30
  - 192.168.127.40
  namespaceSelector:
    matchExpressions:
    - key: environment
      operator: NotIn
      values:
      - development

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: egress-group2
spec:
  egressIPs:
  - 192.168.127.30
  - 192.168.127.40
  namespaceSelector:
    matchExpressions:
    - key: environment
      operator: NotIn
      values:
      - development

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25.15.3. The egressIPConfig object

As a feature of egress IP, the reachabilityTotalTimeoutSeconds parameter configures the EgressIP node reachability check total timeout in seconds. If the EgressIP node cannot be reached within this timeout, the node is declared down.

You can set a value for the reachabilityTotalTimeoutSeconds in the configuration file for the egressIPConfig object. Setting a large value might cause the EgressIP implementation to react slowly to node changes. The implementation reacts slowly for EgressIP nodes that have an issue and are unreachable.

If you omit the reachabilityTotalTimeoutSeconds parameter from the egressIPConfig object, the platform chooses a reasonable default value, which is subject to change over time. The current default is 1 second. A value of 0 disables the reachability check for the EgressIP node.

The following egressIPConfig object describes changing the reachabilityTotalTimeoutSeconds from the default 1 second probes to 5 second probes:

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  defaultNetwork:
    ovnKubernetesConfig:
      egressIPConfig: 
        reachabilityTotalTimeoutSeconds: 5 
      gatewayConfig:
        routingViaHost: false
      genevePort: 6081

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  defaultNetwork:
    ovnKubernetesConfig:
      egressIPConfig:

1


        reachabilityTotalTimeoutSeconds: 5

2


      gatewayConfig:
        routingViaHost: false
      genevePort: 6081

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1: The egressIPConfig holds the configurations for the options of the EgressIP object. By changing these configurations, you can extend the EgressIP object.
2: The value for reachabilityTotalTimeoutSeconds accepts integer values from 0 to 60. A value of 0 disables the reachability check of the egressIP node. Setting a value from 1 to 60 corresponds to the timeout in seconds for a probe to send the reachability check to the node.

25.15.4. Labeling a node to host egress IP addresses

You can apply the k8s.ovn.org/egress-assignable="" label to a node in your cluster so that OpenShift Container Platform can assign one or more egress IP addresses to the node.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster as a cluster administrator.

Procedure

To label a node so that it can host one or more egress IP addresses, enter the following command:

oc label nodes <node_name> k8s.ovn.org/egress-assignable=""

$ oc label nodes <node_name> k8s.ovn.org/egress-assignable=""

1

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1: The name of the node to label.

Tip

You can alternatively apply the following YAML to add the label to a node:

apiVersion: v1
kind: Node
metadata:
  labels:
    k8s.ovn.org/egress-assignable: ""
  name: <node_name>

apiVersion: v1
kind: Node
metadata:
  labels:
    k8s.ovn.org/egress-assignable: ""
  name: <node_name>

Copy to Clipboard

25.15.5. Next steps

Assigning egress IPs

25.16. Assigning an egress IP address

As a cluster administrator, you can assign an egress IP address for traffic leaving the cluster from a namespace or from specific pods in a namespace.

25.16.1. Assigning an egress IP address to a namespace

You can assign one or more egress IP addresses to a namespace or to specific pods in a namespace.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster as a cluster administrator.
Configure at least one node to host an egress IP address.

Procedure

Create an EgressIP object:

Create a <egressips_name>.yaml file where <egressips_name> is the name of the object.

In the file that you created, define an EgressIP object, as in the following example:

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: egress-project1
spec:
  egressIPs:
  - 192.168.127.10
  - 192.168.127.11
  namespaceSelector:
    matchLabels:
      env: qa

apiVersion: k8s.ovn.org/v1
kind: EgressIP
metadata:
  name: egress-project1
spec:
  egressIPs:
  - 192.168.127.10
  - 192.168.127.11
  namespaceSelector:
    matchLabels:
      env: qa

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To create the object, enter the following command.

oc apply -f <egressips_name>.yaml

$ oc apply -f <egressips_name>.yaml

1

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1: Replace <egressips_name> with the name of the object.

Example output

egressips.k8s.ovn.org/<egressips_name> created

egressips.k8s.ovn.org/<egressips_name> created

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Optional: Store the <egressips_name>.yaml file so that you can make changes later.
Add labels to the namespace that requires egress IP addresses. To add a label to the namespace of an EgressIP object defined in step 1, run the following command:
```
oc label ns <namespace> env=qa
```
```
$ oc label ns <namespace> env=qa 
```
1
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1
Replace <namespace> with the namespace that requires egress IP addresses.

Verification

To show all egress IPs that are in use in your cluster, enter the following command:
```
oc get egressip -o yaml
```
```
$ oc get egressip -o yaml
```
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Note
The command oc get egressip only returns one egress IP address regardless of how many are configured. This is not a bug and is a limitation of Kubernetes. As a workaround, you can pass in the -o yaml or -o json flags to return all egress IPs addresses in use.
Example output
```
...
...
```
```
# ...
spec:
  egressIPs:
  - 192.168.127.10
  - 192.168.127.11
# ...
```
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25.17. Considerations for the use of an egress router pod

25.17.1. About an egress router pod

The OpenShift Container Platform egress router pod redirects traffic to a specified remote server from a private source IP address that is not used for any other purpose. An egress router pod can send network traffic to servers that are set up to allow access only from specific IP addresses.

Note

The egress router pod is not intended for every outgoing connection. Creating large numbers of egress router pods can exceed the limits of your network hardware. For example, creating an egress router pod for every project or application could exceed the number of local MAC addresses that the network interface can handle before reverting to filtering MAC addresses in software.

Important

The egress router image is not compatible with Amazon AWS, Azure Cloud, or any other cloud platform that does not support layer 2 manipulations due to their incompatibility with macvlan traffic.

25.17.1.1. Egress router modes

In redirect mode, an egress router pod configures iptables rules to redirect traffic from its own IP address to one or more destination IP addresses. Client pods that need to use the reserved source IP address must be configured to access the service for the egress router rather than connecting directly to the destination IP. You can access the destination service and port from the application pod by using the curl command. For example:

curl <router_service_IP> <port>

$ curl <router_service_IP> <port>

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Note

The egress router CNI plugin supports redirect mode only. This is a difference with the egress router implementation that you can deploy with OpenShift SDN. Unlike the egress router for OpenShift SDN, the egress router CNI plugin does not support HTTP proxy mode or DNS proxy mode.

25.17.1.2. Egress router pod implementation

The egress router implementation uses the egress router Container Network Interface (CNI) plugin. The plugin adds a secondary network interface to a pod.

An egress router is a pod that has two network interfaces. For example, the pod can have eth0 and net1 network interfaces. The eth0 interface is on the cluster network and the pod continues to use the interface for ordinary cluster-related network traffic. The net1 interface is on a secondary network and has an IP address and gateway for that network. Other pods in the OpenShift Container Platform cluster can access the egress router service and the service enables the pods to access external services. The egress router acts as a bridge between pods and an external system.

Traffic that leaves the egress router exits through a node, but the packets have the MAC address of the net1 interface from the egress router pod.

When you add an egress router custom resource, the Cluster Network Operator creates the following objects:

The network attachment definition for the net1 secondary network interface of the pod.
A deployment for the egress router.

If you delete an egress router custom resource, the Operator deletes the two objects in the preceding list that are associated with the egress router.

25.17.1.3. Deployment considerations

An egress router pod adds an additional IP address and MAC address to the primary network interface of the node. As a result, you might need to configure your hypervisor or cloud provider to allow the additional address.

Red Hat OpenStack Platform (RHOSP)

If you deploy OpenShift Container Platform on RHOSP, you must allow traffic from the IP and MAC addresses of the egress router pod on your OpenStack environment. If you do not allow the traffic, then communication will fail:

openstack port set --allowed-address \
  ip_address=<ip_address>,mac_address=<mac_address> <neutron_port_uuid>

$ openstack port set --allowed-address \
  ip_address=<ip_address>,mac_address=<mac_address> <neutron_port_uuid>

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Red Hat Virtualization (RHV)

If you are using RHV, you must select No Network Filter for the Virtual network interface controller (vNIC).

VMware vSphere

If you are using VMware vSphere, see the VMware documentation for securing vSphere standard switches. View and change VMware vSphere default settings by selecting the host virtual switch from the vSphere Web Client.

Specifically, ensure that the following are enabled:

25.17.1.4. Failover configuration

To avoid downtime, the Cluster Network Operator deploys the egress router pod as a deployment resource. The deployment name is egress-router-cni-deployment. The pod that corresponds to the deployment has a label of app=egress-router-cni.

To create a new service for the deployment, use the oc expose deployment/egress-router-cni-deployment --port <port_number> command or create a file like the following example:

apiVersion: v1
kind: Service
metadata:
  name: app-egress
spec:
  ports:
  - name: tcp-8080
    protocol: TCP
    port: 8080
  - name: tcp-8443
    protocol: TCP
    port: 8443
  - name: udp-80
    protocol: UDP
    port: 80
  type: ClusterIP
  selector:
    app: egress-router-cni

apiVersion: v1
kind: Service
metadata:
  name: app-egress
spec:
  ports:
  - name: tcp-8080
    protocol: TCP
    port: 8080
  - name: tcp-8443
    protocol: TCP
    port: 8443
  - name: udp-80
    protocol: UDP
    port: 80
  type: ClusterIP
  selector:
    app: egress-router-cni

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25.18. Deploying an egress router pod in redirect mode

As a cluster administrator, you can deploy an egress router pod to redirect traffic to specified destination IP addresses from a reserved source IP address.

The egress router implementation uses the egress router Container Network Interface (CNI) plugin.

25.18.1. Egress router custom resource

Define the configuration for an egress router pod in an egress router custom resource. The following YAML describes the fields for the configuration of an egress router in redirect mode:

apiVersion: network.operator.openshift.io/v1
kind: EgressRouter
metadata:
  name: <egress_router_name>
  namespace: <namespace>  <.>
spec:
  addresses: [  <.>
    {
      ip: "<egress_router>",  <.>
      gateway: "<egress_gateway>"  <.>
    }
  ]
  mode: Redirect
  redirect: {
    redirectRules: [  <.>
      {
        destinationIP: "<egress_destination>",
        port: <egress_router_port>,
        targetPort: <target_port>,  <.>
        protocol: <network_protocol>  <.>
      },
      ...
    ],
    fallbackIP: "<egress_destination>" <.>
  }

apiVersion: network.operator.openshift.io/v1
kind: EgressRouter
metadata:
  name: <egress_router_name>
  namespace: <namespace>  <.>
spec:
  addresses: [  <.>
    {
      ip: "<egress_router>",  <.>
      gateway: "<egress_gateway>"  <.>
    }
  ]
  mode: Redirect
  redirect: {
    redirectRules: [  <.>
      {
        destinationIP: "<egress_destination>",
        port: <egress_router_port>,
        targetPort: <target_port>,  <.>
        protocol: <network_protocol>  <.>
      },
      ...
    ],
    fallbackIP: "<egress_destination>" <.>
  }

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<.> Optional: The namespace field specifies the namespace to create the egress router in. If you do not specify a value in the file or on the command line, the default namespace is used.

<.> The addresses field specifies the IP addresses to configure on the secondary network interface.

<.> The ip field specifies the reserved source IP address and netmask from the physical network that the node is on to use with egress router pod. Use CIDR notation to specify the IP address and netmask.

<.> The gateway field specifies the IP address of the network gateway.

<.> Optional: The redirectRules field specifies a combination of egress destination IP address, egress router port, and protocol. Incoming connections to the egress router on the specified port and protocol are routed to the destination IP address.

<.> Optional: The targetPort field specifies the network port on the destination IP address. If this field is not specified, traffic is routed to the same network port that it arrived on.

<.> The protocol field supports TCP, UDP, or SCTP.

<.> Optional: The fallbackIP field specifies a destination IP address. If you do not specify any redirect rules, the egress router sends all traffic to this fallback IP address. If you specify redirect rules, any connections to network ports that are not defined in the rules are sent by the egress router to this fallback IP address. If you do not specify this field, the egress router rejects connections to network ports that are not defined in the rules.

Example egress router specification

apiVersion: network.operator.openshift.io/v1
kind: EgressRouter
metadata:
  name: egress-router-redirect
spec:
  networkInterface: {
    macvlan: {
      mode: "Bridge"
    }
  }
  addresses: [
    {
      ip: "192.168.12.99/24",
      gateway: "192.168.12.1"
    }
  ]
  mode: Redirect
  redirect: {
    redirectRules: [
      {
        destinationIP: "10.0.0.99",
        port: 80,
        protocol: UDP
      },
      {
        destinationIP: "203.0.113.26",
        port: 8080,
        targetPort: 80,
        protocol: TCP
      },
      {
        destinationIP: "203.0.113.27",
        port: 8443,
        targetPort: 443,
        protocol: TCP
      }
    ]
  }

apiVersion: network.operator.openshift.io/v1
kind: EgressRouter
metadata:
  name: egress-router-redirect
spec:
  networkInterface: {
    macvlan: {
      mode: "Bridge"
    }
  }
  addresses: [
    {
      ip: "192.168.12.99/24",
      gateway: "192.168.12.1"
    }
  ]
  mode: Redirect
  redirect: {
    redirectRules: [
      {
        destinationIP: "10.0.0.99",
        port: 80,
        protocol: UDP
      },
      {
        destinationIP: "203.0.113.26",
        port: 8080,
        targetPort: 80,
        protocol: TCP
      },
      {
        destinationIP: "203.0.113.27",
        port: 8443,
        targetPort: 443,
        protocol: TCP
      }
    ]
  }

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25.18.2. Deploying an egress router in redirect mode

You can deploy an egress router to redirect traffic from its own reserved source IP address to one or more destination IP addresses.

After you add an egress router, the client pods that need to use the reserved source IP address must be modified to connect to the egress router rather than connecting directly to the destination IP.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create an egress router definition.
To ensure that other pods can find the IP address of the egress router pod, create a service that uses the egress router, as in the following example:
```
apiVersion: v1
kind: Service
metadata:
  name: egress-1
spec:
  ports:
  - name: web-app
    protocol: TCP
    port: 8080
  type: ClusterIP
  selector:
    app: egress-router-cni <.>
```
```
apiVersion: v1
kind: Service
metadata:
  name: egress-1
spec:
  ports:
  - name: web-app
    protocol: TCP
    port: 8080
  type: ClusterIP
  selector:
    app: egress-router-cni <.>
```
Copy to Clipboard
<.> Specify the label for the egress router. The value shown is added by the Cluster Network Operator and is not configurable.
After you create the service, your pods can connect to the service. The egress router pod redirects traffic to the corresponding port on the destination IP address. The connections originate from the reserved source IP address.

Verification

To verify that the Cluster Network Operator started the egress router, complete the following procedure:

View the network attachment definition that the Operator created for the egress router:

oc get network-attachment-definition egress-router-cni-nad

$ oc get network-attachment-definition egress-router-cni-nad

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The name of the network attachment definition is not configurable.

Example output

NAME                    AGE
egress-router-cni-nad   18m

NAME                    AGE
egress-router-cni-nad   18m

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View the deployment for the egress router pod:

oc get deployment egress-router-cni-deployment

$ oc get deployment egress-router-cni-deployment

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The name of the deployment is not configurable.

Example output

NAME                           READY   UP-TO-DATE   AVAILABLE   AGE
egress-router-cni-deployment   1/1     1            1           18m

NAME                           READY   UP-TO-DATE   AVAILABLE   AGE
egress-router-cni-deployment   1/1     1            1           18m

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View the status of the egress router pod:

oc get pods -l app=egress-router-cni

$ oc get pods -l app=egress-router-cni

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Example output

NAME                                            READY   STATUS    RESTARTS   AGE
egress-router-cni-deployment-575465c75c-qkq6m   1/1     Running   0          18m

NAME                                            READY   STATUS    RESTARTS   AGE
egress-router-cni-deployment-575465c75c-qkq6m   1/1     Running   0          18m

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View the logs and the routing table for the egress router pod.

Get the node name for the egress router pod:

POD_NODENAME=$(oc get pod -l app=egress-router-cni -o jsonpath="{.items[0].spec.nodeName}")

$ POD_NODENAME=$(oc get pod -l app=egress-router-cni -o jsonpath="{.items[0].spec.nodeName}")

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Enter into a debug session on the target node. This step instantiates a debug pod called <node_name>-debug:
```
oc debug node/$POD_NODENAME
```
```
$ oc debug node/$POD_NODENAME
```
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Set /host as the root directory within the debug shell. The debug pod mounts the root file system of the host in /host within the pod. By changing the root directory to /host, you can run binaries from the executable paths of the host:
```
chroot /host
```
```
# chroot /host
```
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From within the chroot environment console, display the egress router logs:

cat /tmp/egress-router-log

# cat /tmp/egress-router-log

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Example output

2021-04-26T12:27:20Z [debug] Called CNI ADD
2021-04-26T12:27:20Z [debug] Gateway: 192.168.12.1
2021-04-26T12:27:20Z [debug] IP Source Addresses: [192.168.12.99/24]
2021-04-26T12:27:20Z [debug] IP Destinations: [80 UDP 10.0.0.99/30 8080 TCP 203.0.113.26/30 80 8443 TCP 203.0.113.27/30 443]
2021-04-26T12:27:20Z [debug] Created macvlan interface
2021-04-26T12:27:20Z [debug] Renamed macvlan to "net1"
2021-04-26T12:27:20Z [debug] Adding route to gateway 192.168.12.1 on macvlan interface
2021-04-26T12:27:20Z [debug] deleted default route {Ifindex: 3 Dst: <nil> Src: <nil> Gw: 10.128.10.1 Flags: [] Table: 254}
2021-04-26T12:27:20Z [debug] Added new default route with gateway 192.168.12.1
2021-04-26T12:27:20Z [debug] Added iptables rule: iptables -t nat PREROUTING -i eth0 -p UDP --dport 80 -j DNAT --to-destination 10.0.0.99
2021-04-26T12:27:20Z [debug] Added iptables rule: iptables -t nat PREROUTING -i eth0 -p TCP --dport 8080 -j DNAT --to-destination 203.0.113.26:80
2021-04-26T12:27:20Z [debug] Added iptables rule: iptables -t nat PREROUTING -i eth0 -p TCP --dport 8443 -j DNAT --to-destination 203.0.113.27:443
2021-04-26T12:27:20Z [debug] Added iptables rule: iptables -t nat -o net1 -j SNAT --to-source 192.168.12.99

2021-04-26T12:27:20Z [debug] Called CNI ADD
2021-04-26T12:27:20Z [debug] Gateway: 192.168.12.1
2021-04-26T12:27:20Z [debug] IP Source Addresses: [192.168.12.99/24]
2021-04-26T12:27:20Z [debug] IP Destinations: [80 UDP 10.0.0.99/30 8080 TCP 203.0.113.26/30 80 8443 TCP 203.0.113.27/30 443]
2021-04-26T12:27:20Z [debug] Created macvlan interface
2021-04-26T12:27:20Z [debug] Renamed macvlan to "net1"
2021-04-26T12:27:20Z [debug] Adding route to gateway 192.168.12.1 on macvlan interface
2021-04-26T12:27:20Z [debug] deleted default route {Ifindex: 3 Dst: <nil> Src: <nil> Gw: 10.128.10.1 Flags: [] Table: 254}
2021-04-26T12:27:20Z [debug] Added new default route with gateway 192.168.12.1
2021-04-26T12:27:20Z [debug] Added iptables rule: iptables -t nat PREROUTING -i eth0 -p UDP --dport 80 -j DNAT --to-destination 10.0.0.99
2021-04-26T12:27:20Z [debug] Added iptables rule: iptables -t nat PREROUTING -i eth0 -p TCP --dport 8080 -j DNAT --to-destination 203.0.113.26:80
2021-04-26T12:27:20Z [debug] Added iptables rule: iptables -t nat PREROUTING -i eth0 -p TCP --dport 8443 -j DNAT --to-destination 203.0.113.27:443
2021-04-26T12:27:20Z [debug] Added iptables rule: iptables -t nat -o net1 -j SNAT --to-source 192.168.12.99

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The logging file location and logging level are not configurable when you start the egress router by creating an EgressRouter object as described in this procedure.

From within the chroot environment console, get the container ID:

crictl ps --name egress-router-cni-pod | awk '{print $1}'

# crictl ps --name egress-router-cni-pod | awk '{print $1}'

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Example output

CONTAINER
bac9fae69ddb6

CONTAINER
bac9fae69ddb6

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Determine the process ID of the container. In this example, the container ID is bac9fae69ddb6:

crictl inspect -o yaml bac9fae69ddb6 | grep 'pid:' | awk '{print $2}'

# crictl inspect -o yaml bac9fae69ddb6 | grep 'pid:' | awk '{print $2}'

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Example output

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Enter the network namespace of the container:
```
nsenter -n -t 68857
```
```
# nsenter -n -t 68857
```
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Display the routing table:
```
ip route
```
```
# ip route
```
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In the following example output, the net1 network interface is the default route. Traffic for the cluster network uses the eth0 network interface. Traffic for the 192.168.12.0/24 network uses the net1 network interface and originates from the reserved source IP address 192.168.12.99. The pod routes all other traffic to the gateway at IP address 192.168.12.1. Routing for the service network is not shown.
Example output
```
default via 192.168.12.1 dev net1
10.128.10.0/23 dev eth0 proto kernel scope link src 10.128.10.18
192.168.12.0/24 dev net1 proto kernel scope link src 192.168.12.99
192.168.12.1 dev net1
```
```
default via 192.168.12.1 dev net1
10.128.10.0/23 dev eth0 proto kernel scope link src 10.128.10.18
192.168.12.0/24 dev net1 proto kernel scope link src 192.168.12.99
192.168.12.1 dev net1
```
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25.19. Enabling multicast for a project

25.19.1. About multicast

With IP multicast, data is broadcast to many IP addresses simultaneously.

Important

At this time, multicast is best used for low-bandwidth coordination or service discovery and not a high-bandwidth solution.
By default, network policies affect all connections in a namespace. However, multicast is unaffected by network policies. If multicast is enabled in the same namespace as your network policies, it is always allowed, even if there is a deny-all network policy. Cluster administrators should consider the implications to the exemption of multicast from network policies before enabling it.

Multicast traffic between OpenShift Container Platform pods is disabled by default. If you are using the OVN-Kubernetes network plugin, you can enable multicast on a per-project basis.

25.19.2. Enabling multicast between pods

You can enable multicast between pods for your project.

Prerequisites

Install the OpenShift CLI (oc).
You must log in to the cluster with a user that has the cluster-admin role.

Procedure

Run the following command to enable multicast for a project. Replace <namespace> with the namespace for the project you want to enable multicast for.

oc annotate namespace <namespace> \
    k8s.ovn.org/multicast-enabled=true

$ oc annotate namespace <namespace> \
    k8s.ovn.org/multicast-enabled=true

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Tip

You can alternatively apply the following YAML to add the annotation:

apiVersion: v1
kind: Namespace
metadata:
  name: <namespace>
  annotations:
    k8s.ovn.org/multicast-enabled: "true"

apiVersion: v1
kind: Namespace
metadata:
  name: <namespace>
  annotations:
    k8s.ovn.org/multicast-enabled: "true"

Copy to Clipboard

Verification

To verify that multicast is enabled for a project, complete the following procedure:

Change your current project to the project that you enabled multicast for. Replace <project> with the project name.
```
oc project <project>
```
```
$ oc project <project>
```
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Create a pod to act as a multicast receiver:

cat <<EOF| oc create -f -
apiVersion: v1
kind: Pod
metadata:
  name: mlistener
  labels:
    app: multicast-verify
spec:
  containers:
    - name: mlistener
      image: registry.access.redhat.com/ubi9
      command: ["/bin/sh", "-c"]
      args:
        ["dnf -y install socat hostname && sleep inf"]
      ports:
        - containerPort: 30102
          name: mlistener
          protocol: UDP
EOF

$ cat <<EOF| oc create -f -
apiVersion: v1
kind: Pod
metadata:
  name: mlistener
  labels:
    app: multicast-verify
spec:
  containers:
    - name: mlistener
      image: registry.access.redhat.com/ubi9
      command: ["/bin/sh", "-c"]
      args:
        ["dnf -y install socat hostname && sleep inf"]
      ports:
        - containerPort: 30102
          name: mlistener
          protocol: UDP
EOF

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Create a pod to act as a multicast sender:

cat <<EOF| oc create -f -
apiVersion: v1
kind: Pod
metadata:
  name: msender
  labels:
    app: multicast-verify
spec:
  containers:
    - name: msender
      image: registry.access.redhat.com/ubi9
      command: ["/bin/sh", "-c"]
      args:
        ["dnf -y install socat && sleep inf"]
EOF

$ cat <<EOF| oc create -f -
apiVersion: v1
kind: Pod
metadata:
  name: msender
  labels:
    app: multicast-verify
spec:
  containers:
    - name: msender
      image: registry.access.redhat.com/ubi9
      command: ["/bin/sh", "-c"]
      args:
        ["dnf -y install socat && sleep inf"]
EOF

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In a new terminal window or tab, start the multicast listener.

Get the IP address for the Pod:

POD_IP=$(oc get pods mlistener -o jsonpath='{.status.podIP}')

$ POD_IP=$(oc get pods mlistener -o jsonpath='{.status.podIP}')

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Start the multicast listener by entering the following command:

oc exec mlistener -i -t -- \
    socat UDP4-RECVFROM:30102,ip-add-membership=224.1.0.1:$POD_IP,fork EXEC:hostname

$ oc exec mlistener -i -t -- \
    socat UDP4-RECVFROM:30102,ip-add-membership=224.1.0.1:$POD_IP,fork EXEC:hostname

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Start the multicast transmitter.

Get the pod network IP address range:

CIDR=$(oc get Network.config.openshift.io cluster \
    -o jsonpath='{.status.clusterNetwork[0].cidr}')

$ CIDR=$(oc get Network.config.openshift.io cluster \
    -o jsonpath='{.status.clusterNetwork[0].cidr}')

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To send a multicast message, enter the following command:

oc exec msender -i -t -- \
    /bin/bash -c "echo | socat STDIO UDP4-DATAGRAM:224.1.0.1:30102,range=$CIDR,ip-multicast-ttl=64"

$ oc exec msender -i -t -- \
    /bin/bash -c "echo | socat STDIO UDP4-DATAGRAM:224.1.0.1:30102,range=$CIDR,ip-multicast-ttl=64"

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If multicast is working, the previous command returns the following output:

mlistener

mlistener

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25.20. Disabling multicast for a project

25.20.1. Disabling multicast between pods

You can disable multicast between pods for your project.

Prerequisites

Install the OpenShift CLI (oc).
You must log in to the cluster with a user that has the cluster-admin role.

Procedure

Disable multicast by running the following command:

oc annotate namespace <namespace> \
    k8s.ovn.org/multicast-enabled-

$ oc annotate namespace <namespace> \

1


    k8s.ovn.org/multicast-enabled-

Copy to Clipboard

1: The namespace for the project you want to disable multicast for.

Tip

You can alternatively apply the following YAML to delete the annotation:

apiVersion: v1
kind: Namespace
metadata:
  name: <namespace>
  annotations:
    k8s.ovn.org/multicast-enabled: null

apiVersion: v1
kind: Namespace
metadata:
  name: <namespace>
  annotations:
    k8s.ovn.org/multicast-enabled: null

Copy to Clipboard

25.21. Tracking network flows

As a cluster administrator, you can collect information about pod network flows from your cluster to assist with the following areas:

Monitor ingress and egress traffic on the pod network.
Troubleshoot performance issues.
Gather data for capacity planning and security audits.

When you enable the collection of the network flows, only the metadata about the traffic is collected. For example, packet data is not collected, but the protocol, source address, destination address, port numbers, number of bytes, and other packet-level information is collected.

The data is collected in one or more of the following record formats:

NetFlow
sFlow
IPFIX

When you configure the Cluster Network Operator (CNO) with one or more collector IP addresses and port numbers, the Operator configures Open vSwitch (OVS) on each node to send the network flows records to each collector.

You can configure the Operator to send records to more than one type of network flow collector. For example, you can send records to NetFlow collectors and also send records to sFlow collectors.

When OVS sends data to the collectors, each type of collector receives identical records. For example, if you configure two NetFlow collectors, OVS on a node sends identical records to the two collectors. If you also configure two sFlow collectors, the two sFlow collectors receive identical records. However, each collector type has a unique record format.

Collecting the network flows data and sending the records to collectors affects performance. Nodes process packets at a slower rate. If the performance impact is too great, you can delete the destinations for collectors to disable collecting network flows data and restore performance.

Note

Enabling network flow collectors might have an impact on the overall performance of the cluster network.

25.21.1. Network object configuration for tracking network flows

The fields for configuring network flows collectors in the Cluster Network Operator (CNO) are shown in the following table:

Table 25.13. Network flows configuration
Field	Type	Description
`metadata.name`	`string`	The name of the CNO object. This name is always `cluster`.
`spec.exportNetworkFlows`	`object`	One or more of `netFlow`, `sFlow`, or `ipfix`.
`spec.exportNetworkFlows.netFlow.collectors`	`array`	A list of IP address and network port pairs for up to 10 collectors.
`spec.exportNetworkFlows.sFlow.collectors`	`array`	A list of IP address and network port pairs for up to 10 collectors.
`spec.exportNetworkFlows.ipfix.collectors`	`array`	A list of IP address and network port pairs for up to 10 collectors.

After applying the following manifest to the CNO, the Operator configures Open vSwitch (OVS) on each node in the cluster to send network flows records to the NetFlow collector that is listening at 192.168.1.99:2056.

Example configuration for tracking network flows

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  exportNetworkFlows:
    netFlow:
      collectors:
        - 192.168.1.99:2056

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  exportNetworkFlows:
    netFlow:
      collectors:
        - 192.168.1.99:2056

Copy to Clipboard

25.21.2. Adding destinations for network flows collectors

As a cluster administrator, you can configure the Cluster Network Operator (CNO) to send network flows metadata about the pod network to a network flows collector.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.
You have a network flows collector and know the IP address and port that it listens on.

Procedure

Create a patch file that specifies the network flows collector type and the IP address and port information of the collectors:

spec:
  exportNetworkFlows:
    netFlow:
      collectors:
        - 192.168.1.99:2056

spec:
  exportNetworkFlows:
    netFlow:
      collectors:
        - 192.168.1.99:2056

Copy to Clipboard

Configure the CNO with the network flows collectors:

oc patch network.operator cluster --type merge -p "$(cat <file_name>.yaml)"

$ oc patch network.operator cluster --type merge -p "$(cat <file_name>.yaml)"

Copy to Clipboard

Example output

network.operator.openshift.io/cluster patched

network.operator.openshift.io/cluster patched

Copy to Clipboard

Verification

Verification is not typically necessary. You can run the following command to confirm that Open vSwitch (OVS) on each node is configured to send network flows records to one or more collectors.

View the Operator configuration to confirm that the exportNetworkFlows field is configured:

oc get network.operator cluster -o jsonpath="{.spec.exportNetworkFlows}"

$ oc get network.operator cluster -o jsonpath="{.spec.exportNetworkFlows}"

Copy to Clipboard

Example output

{"netFlow":{"collectors":["192.168.1.99:2056"]}}

{"netFlow":{"collectors":["192.168.1.99:2056"]}}

Copy to Clipboard

View the network flows configuration in OVS from each node:

for pod in $(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-node -o jsonpath='{range@.items[*]}{.metadata.name}{"\n"}{end}');

$ for pod in $(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-node -o jsonpath='{range@.items[*]}{.metadata.name}{"\n"}{end}');
  do ;
    echo;
    echo $pod;
    oc -n openshift-ovn-kubernetes exec -c ovnkube-node $pod \
      -- bash -c 'for type in ipfix sflow netflow ; do ovs-vsctl find $type ; done';
done

Copy to Clipboard

Example output

ovnkube-node-xrn4p
_uuid               : a4d2aaca-5023-4f3d-9400-7275f92611f9
active_timeout      : 60
add_id_to_interface : false
engine_id           : []
engine_type         : []
external_ids        : {}
targets             : ["192.168.1.99:2056"]

ovnkube-node-z4vq9
_uuid               : 61d02fdb-9228-4993-8ff5-b27f01a29bd6
active_timeout      : 60
add_id_to_interface : false
engine_id           : []
engine_type         : []
external_ids        : {}
targets             : ["192.168.1.99:2056"]-

...

ovnkube-node-xrn4p
_uuid               : a4d2aaca-5023-4f3d-9400-7275f92611f9
active_timeout      : 60
add_id_to_interface : false
engine_id           : []
engine_type         : []
external_ids        : {}
targets             : ["192.168.1.99:2056"]

ovnkube-node-z4vq9
_uuid               : 61d02fdb-9228-4993-8ff5-b27f01a29bd6
active_timeout      : 60
add_id_to_interface : false
engine_id           : []
engine_type         : []
external_ids        : {}
targets             : ["192.168.1.99:2056"]-

...

Copy to Clipboard

25.21.3. Deleting all destinations for network flows collectors

As a cluster administrator, you can configure the Cluster Network Operator (CNO) to stop sending network flows metadata to a network flows collector.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in to the cluster with a user with cluster-admin privileges.

Procedure

Remove all network flows collectors:

oc patch network.operator cluster --type='json' \
    -p='[{"op":"remove", "path":"/spec/exportNetworkFlows"}]'

$ oc patch network.operator cluster --type='json' \
    -p='[{"op":"remove", "path":"/spec/exportNetworkFlows"}]'

Copy to Clipboard

Example output

network.operator.openshift.io/cluster patched

network.operator.openshift.io/cluster patched

Copy to Clipboard

25.22. Configuring hybrid networking

As a cluster administrator, you can configure the Red Hat OpenShift Networking OVN-Kubernetes network plugin to allow Linux and Windows nodes to host Linux and Windows workloads, respectively.

25.22.1. Configuring hybrid networking with OVN-Kubernetes

You can configure your cluster to use hybrid networking with the OVN-Kubernetes network plugin. This allows a hybrid cluster that supports different node networking configurations.

Note

This configuration is necessary to run both Linux and Windows nodes in the same cluster.

Prerequisites

Install the OpenShift CLI (oc).
Log in to the cluster as a user with cluster-admin privileges.
Ensure that the cluster uses the OVN-Kubernetes network plugin.

Procedure

To configure the OVN-Kubernetes hybrid network overlay, enter the following command:
```
oc patch networks.operator.openshift.io cluster --type=merge \
  -p '{
```
```
$ oc patch networks.operator.openshift.io cluster --type=merge \
  -p '{
    "spec":{
      "defaultNetwork":{
        "ovnKubernetesConfig":{
          "hybridOverlayConfig":{
            "hybridClusterNetwork":[
              {
                "cidr": "<cidr>",
                "hostPrefix": <prefix>
              }
            ],
            "hybridOverlayVXLANPort": <overlay_port>
          }
        }
      }
    }
  }'
```
Copy to Clipboard
where:
cidr
Specify the CIDR configuration used for nodes on the additional overlay network. This CIDR must not overlap with the cluster network CIDR.
hostPrefix
Specifies the subnet prefix length to assign to each individual node. For example, if hostPrefix is set to 23, then each node is assigned a /23 subnet out of the given cidr, which allows for 510 (2^(32 - 23) - 2) pod IP addresses. If you are required to provide access to nodes from an external network, configure load balancers and routers to manage the traffic.
hybridOverlayVXLANPort
Specify a custom VXLAN port for the additional overlay network. This is required for running Windows nodes in a cluster installed on vSphere, and must not be configured for any other cloud provider. The custom port can be any open port excluding the default 4789 port. For more information on this requirement, see the Microsoft documentation on Pod-to-pod connectivity between hosts is broken.
Note
Windows Server Long-Term Servicing Channel (LTSC): Windows Server 2019 is not supported on clusters with a custom hybridOverlayVXLANPort value because this Windows server version does not support selecting a custom VXLAN port.
Example output
```
network.operator.openshift.io/cluster patched
```
```
network.operator.openshift.io/cluster patched
```
Copy to Clipboard

To confirm that the configuration is active, enter the following command. It can take several minutes for the update to apply.

oc get network.operator.openshift.io -o jsonpath="{.items[0].spec.defaultNetwork.ovnKubernetesConfig}"

$ oc get network.operator.openshift.io -o jsonpath="{.items[0].spec.defaultNetwork.ovnKubernetesConfig}"

Copy to Clipboard

Chapter 26. OpenShift SDN network plugin

26.1. About the OpenShift SDN network plugin

Part of Red Hat OpenShift Networking, OpenShift SDN is a network plugin that uses a software-defined networking (SDN) approach to provide a unified cluster network that enables communication between pods across the OpenShift Container Platform cluster. This pod network is established and maintained by OpenShift SDN, which configures an overlay network by using Open vSwitch (OVS).

Important

For a cloud controller manager (CCM) with the --cloud-provider=external option set to cloud-provider-vsphere, a known issue exists for a cluster that operates in a networking environment with multiple subnets.

When you upgrade your cluster from OpenShift Container Platform 4.12 to OpenShift Container Platform 4.13, the CCM selects a wrong node IP address and this operation generates an error message in the namespaces/openshift-cloud-controller-manager/pods/vsphere-cloud-controller-manager logs. The error message indicates a mismatch with the node IP address and the vsphere-cloud-controller-manager pod IP address in your cluster.

The known issue might not impact the cluster upgrade operation, but you can set the correct IP address in both the nodeNetworking.external.networkSubnetCidr and the nodeNetworking.internal.networkSubnetCidr parameters for the nodeNetworking object that your cluster uses for its networking requirements.

26.1.1. OpenShift SDN network isolation modes

OpenShift SDN provides three SDN modes for configuring the pod network:

Network policy mode allows project administrators to configure their own isolation policies using NetworkPolicy objects. Network policy is the default mode in OpenShift Container Platform 4.13.
Multitenant mode provides project-level isolation for pods and services. Pods from different projects cannot send packets to or receive packets from pods and services of a different project. You can disable isolation for a project, allowing it to send network traffic to all pods and services in the entire cluster and receive network traffic from those pods and services.
Subnet mode provides a flat pod network where every pod can communicate with every other pod and service. The network policy mode provides the same functionality as subnet mode.

26.1.2. Supported network plugin feature matrix

Red Hat OpenShift Networking offers two options for the network plugin, OpenShift SDN and OVN-Kubernetes, for the network plugin. The following table summarizes the current feature support for both network plugins:

Table 26.1. Default CNI network plugin feature comparison
Feature	OpenShift SDN	OVN-Kubernetes
Egress IPs	Supported	Supported
Egress firewall	Supported	Supported ^[1]
Egress router	Supported	Supported ^[2]
Hybrid networking	Not supported	Supported
IPsec encryption for intra-cluster communication	Not supported	Supported
IPv4 single-stack	Supported	Supported
IPv6 single-stack	Not supported	Supported ^[3]
IPv4/IPv6 dual-stack	Not Supported	Supported ^[4]
IPv6/IPv4 dual-stack	Not supported	Supported ^[5]
Kubernetes network policy	Supported	Supported
Kubernetes network policy logs	Not supported	Supported
Hardware offloading	Not supported	Supported
Multicast	Supported	Supported

Egress firewall is also known as egress network policy in OpenShift SDN. This is not the same as network policy egress.
Egress router for OVN-Kubernetes supports only redirect mode.
IPv6 single-stack networking on a bare-metal platform.
IPv4/IPv6 dual-stack networking on bare-metal, VMware vSphere (installer-provisioned infrastructure installations only), IBM Power®, and IBM Z® platforms. On VMware vSphere, dual-stack networking limitations exist.
IPv6/IPv4 dual-stack networking on bare-metal and IBM Power® platforms.

26.2. Migrating to the OpenShift SDN network plugin

As a cluster administrator, you can migrate to the OpenShift SDN network plugin from the OVN-Kubernetes network plugin.

To learn more about OpenShift SDN, read About the OpenShift SDN network plugin.

26.2.1. How the migration process works

The following table summarizes the migration process by segmenting between the user-initiated steps in the process and the actions that the migration performs in response.

Table 26.2. Migrating to OpenShift SDN from OVN-Kubernetes
User-initiated steps	Migration activity
Set the `migration` field of the `Network.operator.openshift.io` custom resource (CR) named `cluster` to `OpenShiftSDN`. Make sure the `migration` field is `null` before setting it to a value.	Cluster Network Operator (CNO) Updates the status of the `Network.config.openshift.io` CR named `cluster` accordingly. Machine Config Operator (MCO) Rolls out an update to the systemd configuration necessary for OpenShift SDN; the MCO updates a single machine per pool at a time by default, causing the total time the migration takes to increase with the size of the cluster.
Update the `networkType` field of the `Network.config.openshift.io` CR.	CNO Performs the following actions: Destroys the OVN-Kubernetes control plane pods. Deploys the OpenShift SDN control plane pods. Updates the Multus objects to reflect the new network plugin.
Reboot each node in the cluster.	Cluster As nodes reboot, the cluster assigns IP addresses to pods on the OpenShift SDN cluster network.

26.2.2. Migrating to the OpenShift SDN network plugin

Cluster administrators can roll back to the OpenShift SDN Container Network Interface (CNI) network plugin by using the offline migration method. During the migration you must manually reboot every node in your cluster. With the offline migration method, there is some downtime, during which your cluster is unreachable.

Prerequisites

Install the OpenShift CLI (oc).
Access to the cluster as a user with the cluster-admin role.
A cluster installed on infrastructure configured with the OVN-Kubernetes network plugin.
A recent backup of the etcd database is available.
A reboot can be triggered manually for each node.
The cluster is in a known good state, without any errors.

Procedure

Stop all of the machine configuration pools managed by the Machine Config Operator (MCO):

Stop the master configuration pool by entering the following command in your CLI:

oc patch MachineConfigPool master --type='merge' --patch \
  '{ "spec": { "paused": true } }'

$ oc patch MachineConfigPool master --type='merge' --patch \
  '{ "spec": { "paused": true } }'

Copy to Clipboard

Stop the worker machine configuration pool by entering the following command in your CLI:

oc patch MachineConfigPool worker --type='merge' --patch \
  '{ "spec":{ "paused": true } }'

$ oc patch MachineConfigPool worker --type='merge' --patch \
  '{ "spec":{ "paused": true } }'

Copy to Clipboard

To prepare for the migration, set the migration field to null by entering the following command in your CLI:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

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Check that the migration status is empty for the Network.config.openshift.io object by entering the following command in your CLI. Empty command output indicates that the object is not in a migration operation.
```
oc get Network.config cluster -o jsonpath='{.status.migration}'
```
```
$ oc get Network.config cluster -o jsonpath='{.status.migration}'
```
Copy to Clipboard
Apply the patch to the Network.operator.openshift.io object to set the network plugin back to OpenShift SDN by entering the following command in your CLI:
```
oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OpenShiftSDN" } } }'
```
```
$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OpenShiftSDN" } } }'
```
Copy to Clipboard
Important
If you applied the patch to the Network.config.openshift.io object before the patch operation finalizes on the Network.operator.openshift.io object, the Cluster Network Operator (CNO) enters into a degradation state and this causes a slight delay until the CNO recovers from the degraded state.
Confirm that the migration status of the network plugin for the Network.config.openshift.io cluster object is OpenShiftSDN by entering the following command in your CLI:
```
oc get Network.config cluster -o jsonpath='{.status.migration.networkType}'
```
```
$ oc get Network.config cluster -o jsonpath='{.status.migration.networkType}'
```
Copy to Clipboard

Apply the patch to the Network.config.openshift.io object to set the network plugin back to OpenShift SDN by entering the following command in your CLI:

oc patch Network.config.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "networkType": "OpenShiftSDN" } }'

$ oc patch Network.config.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "networkType": "OpenShiftSDN" } }'

Copy to Clipboard

Optional: Disable automatic migration of several OVN-Kubernetes capabilities to the OpenShift SDN equivalents:
- Egress IPs
- Egress firewall
- Multicast
To disable automatic migration of the configuration for any of the previously noted OpenShift SDN features, specify the following keys:
```
oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{
    "spec": {
      "migration": {
        "networkType": "OpenShiftSDN",
        "features": {
          "egressIP": <bool>,
          "egressFirewall": <bool>,
          "multicast": <bool>
        }
      }
    }
  }'
```
Copy to Clipboard
where:
bool: Specifies whether to enable migration of the feature. The default is true.
Optional: You can customize the following settings for OpenShift SDN to meet your network infrastructure requirements:
- Maximum transmission unit (MTU)
- VXLAN port
To customize either or both of the previously noted settings, customize and enter the following command in your CLI. If you do not need to change the default value, omit the key from the patch.
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "openshiftSDNConfig":{
          "mtu":<mtu>,
          "vxlanPort":<port>
    }}}}'
```
Copy to Clipboard
mtu
The MTU for the VXLAN overlay network. This value is normally configured automatically, but if the nodes in your cluster do not all use the same MTU, then you must set this explicitly to 50 less than the smallest node MTU value.
port
The UDP port for the VXLAN overlay network. If a value is not specified, the default is 4789. The port cannot be the same as the Geneve port that is used by OVN-Kubernetes. The default value for the Geneve port is 6081.
Example patch command
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "openshiftSDNConfig":{
          "mtu":1200
    }}}}'
```
Copy to Clipboard

Reboot each node in your cluster. You can reboot the nodes in your cluster with either of the following approaches:

With the oc rsh command, you can use a bash script similar to the following:

#!/bin/bash
readarray -t POD_NODES <<< "$(oc get pod -n openshift-machine-config-operator -o wide| grep daemon|awk '{print $1" "$7}')"

for i in "${POD_NODES[@]}"
do
  read -r POD NODE <<< "$i"
  until oc rsh -n openshift-machine-config-operator "$POD" chroot /rootfs shutdown -r +1
    do
      echo "cannot reboot node $NODE, retry" && sleep 3
    done
done

#!/bin/bash
readarray -t POD_NODES <<< "$(oc get pod -n openshift-machine-config-operator -o wide| grep daemon|awk '{print $1" "$7}')"

for i in "${POD_NODES[@]}"
do
  read -r POD NODE <<< "$i"
  until oc rsh -n openshift-machine-config-operator "$POD" chroot /rootfs shutdown -r +1
    do
      echo "cannot reboot node $NODE, retry" && sleep 3
    done
done

Copy to Clipboard

With the ssh command, you can use a bash script similar to the following. The script assumes that you have configured sudo to not prompt for a password.

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

Copy to Clipboard

Wait until the Multus daemon set rollout completes. Run the following command to see your rollout status:

oc -n openshift-multus rollout status daemonset/multus

$ oc -n openshift-multus rollout status daemonset/multus

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The name of the Multus pods is in the form of multus-<xxxxx> where <xxxxx> is a random sequence of letters. It might take several moments for the pods to restart.

Example output

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

Copy to Clipboard

After the nodes in your cluster have rebooted and the multus pods are rolled out, start all of the machine configuration pools by running the following commands::
- Start the master configuration pool:
  $ oc patch MachineConfigPool master --type='merge' --patch \ '{ "spec": { "paused": false } }'
  Copy to Clipboard
- Start the worker configuration pool:
  $ oc patch MachineConfigPool worker --type='merge' --patch \ '{ "spec": { "paused": false } }'
  Copy to Clipboard
As the MCO updates machines in each config pool, it reboots each node.
By default the MCO updates a single machine per pool at a time, so the time that the migration requires to complete grows with the size of the cluster.

Confirm the status of the new machine configuration on the hosts:

To list the machine configuration state and the name of the applied machine configuration, enter the following command in your CLI:

oc describe node | egrep "hostname|machineconfig"

$ oc describe node | egrep "hostname|machineconfig"

Copy to Clipboard

Example output

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

Copy to Clipboard

Verify that the following statements are true:

The value of machineconfiguration.openshift.io/state field is Done.
The value of the machineconfiguration.openshift.io/currentConfig field is equal to the value of the machineconfiguration.openshift.io/desiredConfig field.

To confirm that the machine config is correct, enter the following command in your CLI:
```
oc get machineconfig <config_name> -o yaml
```
```
$ oc get machineconfig <config_name> -o yaml
```
Copy to Clipboard
where <config_name> is the name of the machine config from the machineconfiguration.openshift.io/currentConfig field.

Confirm that the migration succeeded:

To confirm that the network plugin is OpenShift SDN, enter the following command in your CLI. The value of status.networkType must be OpenShiftSDN.
```
oc get Network.config/cluster -o jsonpath='{.status.networkType}{"\n"}'
```
```
$ oc get Network.config/cluster -o jsonpath='{.status.networkType}{"\n"}'
```
Copy to Clipboard
To confirm that the cluster nodes are in the Ready state, enter the following command in your CLI:
```
oc get nodes
```
```
$ oc get nodes
```
Copy to Clipboard

If a node is stuck in the NotReady state, investigate the machine config daemon pod logs and resolve any errors.

To list the pods, enter the following command in your CLI:

oc get pod -n openshift-machine-config-operator

$ oc get pod -n openshift-machine-config-operator

Copy to Clipboard

Example output

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

Copy to Clipboard

The names for the config daemon pods are in the following format: machine-config-daemon-<seq>. The <seq> value is a random five character alphanumeric sequence.

To display the pod log for each machine config daemon pod shown in the previous output, enter the following command in your CLI:
```
oc logs <pod> -n openshift-machine-config-operator
```
```
$ oc logs <pod> -n openshift-machine-config-operator
```
Copy to Clipboard
where pod is the name of a machine config daemon pod.
Resolve any errors in the logs shown by the output from the previous command.

To confirm that your pods are not in an error state, enter the following command in your CLI:
```
oc get pods --all-namespaces -o wide --sort-by='{.spec.nodeName}'
```
```
$ oc get pods --all-namespaces -o wide --sort-by='{.spec.nodeName}'
```
Copy to Clipboard
If pods on a node are in an error state, reboot that node.

Complete the following steps only if the migration succeeds and your cluster is in a good state:

To remove the migration configuration from the Cluster Network Operator configuration object, enter the following command in your CLI:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

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To remove the OVN-Kubernetes configuration, enter the following command in your CLI:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "defaultNetwork": { "ovnKubernetesConfig":null } } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "defaultNetwork": { "ovnKubernetesConfig":null } } }'

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To remove the OVN-Kubernetes network provider namespace, enter the following command in your CLI:
```
oc delete namespace openshift-ovn-kubernetes
```
```
$ oc delete namespace openshift-ovn-kubernetes
```
Copy to Clipboard

26.3. Rolling back to the OVN-Kubernetes network plugin

As a cluster administrator, you can rollback to the OVN-Kubernetes network plugin from the OpenShift SDN network plugin if the migration to OpenShift SDN is unsuccessful.

To learn more about OVN-Kubernetes, read About the OVN-Kubernetes network plugin.

26.3.1. Migrating to the OVN-Kubernetes network plugin

As a cluster administrator, you can change the network plugin for your cluster to OVN-Kubernetes. During the migration, you must reboot every node in your cluster.

Important

While performing the migration, your cluster is unavailable and workloads might be interrupted. Perform the migration only when an interruption in service is acceptable.

Prerequisites

You have a cluster configured with the OpenShift SDN CNI network plugin in the network policy isolation mode.
You installed the OpenShift CLI (oc).
You have access to the cluster as a user with the cluster-admin role.
You have a recent backup of the etcd database.
You can manually reboot each node.
You checked that your cluster is in a known good state without any errors.
You created a security group rule that allows User Datagram Protocol (UDP) packets on port 6081 for all nodes on all cloud platforms.

Procedure

To backup the configuration for the cluster network, enter the following command:

oc get Network.config.openshift.io cluster -o yaml > cluster-openshift-sdn.yaml

$ oc get Network.config.openshift.io cluster -o yaml > cluster-openshift-sdn.yaml

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Verify that the OVN_SDN_MIGRATION_TIMEOUT environment variable is set and is equal to 0s by running the following command:

#!/bin/bash

if [ -n "$OVN_SDN_MIGRATION_TIMEOUT" ] && [ "$OVN_SDN_MIGRATION_TIMEOUT" = "0s" ]; then
    unset OVN_SDN_MIGRATION_TIMEOUT
fi

#loops the timeout command of the script to repeatedly check the cluster Operators until all are available.

co_timeout=${OVN_SDN_MIGRATION_TIMEOUT:-1200s}
timeout "$co_timeout" bash <<EOT
until
  oc wait co --all --for='condition=AVAILABLE=True' --timeout=10s && \
  oc wait co --all --for='condition=PROGRESSING=False' --timeout=10s && \
  oc wait co --all --for='condition=DEGRADED=False' --timeout=10s;
do
  sleep 10
  echo "Some ClusterOperators Degraded=False,Progressing=True,or Available=False";
done
EOT

#!/bin/bash

if [ -n "$OVN_SDN_MIGRATION_TIMEOUT" ] && [ "$OVN_SDN_MIGRATION_TIMEOUT" = "0s" ]; then
    unset OVN_SDN_MIGRATION_TIMEOUT
fi

#loops the timeout command of the script to repeatedly check the cluster Operators until all are available.

co_timeout=${OVN_SDN_MIGRATION_TIMEOUT:-1200s}
timeout "$co_timeout" bash <<EOT
until
  oc wait co --all --for='condition=AVAILABLE=True' --timeout=10s && \
  oc wait co --all --for='condition=PROGRESSING=False' --timeout=10s && \
  oc wait co --all --for='condition=DEGRADED=False' --timeout=10s;
do
  sleep 10
  echo "Some ClusterOperators Degraded=False,Progressing=True,or Available=False";
done
EOT

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Remove the configuration from the Cluster Network Operator (CNO) configuration object by running the following command:

oc patch Network.operator.openshift.io cluster --type='merge' \
--patch '{"spec":{"migration":null}}'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
--patch '{"spec":{"migration":null}}'

Copy to Clipboard

Delete the NodeNetworkConfigurationPolicy (NNCP) custom resource (CR) that defines the primary network interface for the OpenShift SDN network plugin by completing the following steps:
1. Check that the existing NNCP CR bonded the primary interface to your cluster by entering the following command:
  $ oc get nncp
  Copy to Clipboard
  Example output
  NAME STATUS REASON bondmaster0 Available SuccessfullyConfigured
  
  Copy to Clipboard
  Network Manager stores the connection profile for the bonded primary interface in the /etc/NetworkManager/system-connections system path.
2. Remove the NNCP from your cluster:
  $ oc delete nncp <nncp_manifest_filename>
  Copy to Clipboard
To prepare all the nodes for the migration, set the migration field on the CNO configuration object by running the following command:
```
oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OVNKubernetes" } } }'
```
```
$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": { "networkType": "OVNKubernetes" } } }'
```
Copy to Clipboard
Note
This step does not deploy OVN-Kubernetes immediately. Instead, specifying the migration field triggers the Machine Config Operator (MCO) to apply new machine configs to all the nodes in the cluster in preparation for the OVN-Kubernetes deployment.
1. Check that the reboot is finished by running the following command:
  $ oc get mcp
  Copy to Clipboard
2. Check that all cluster Operators are available by running the following command:
  $ oc get co
  Copy to Clipboard
3. Alternatively: You can disable automatic migration of several OpenShift SDN capabilities to the OVN-Kubernetes equivalents:
  - Egress IPs
  - Egress firewall
  - Multicast
  To disable automatic migration of the configuration for any of the previously noted OpenShift SDN features, specify the following keys:
  $ oc patch Network.operator.openshift.io cluster --type='merge' \ --patch '{ "spec": { "migration": { "networkType": "OVNKubernetes", "features": { "egressIP": <bool>, "egressFirewall": <bool>, "multicast": <bool> } } } }'
  Copy to Clipboard
  where:
  bool: Specifies whether to enable migration of the feature. The default is true.
Optional: You can customize the following settings for OVN-Kubernetes to meet your network infrastructure requirements:
- Maximum transmission unit (MTU). Consider the following before customizing the MTU for this optional step:
  - If you use the default MTU, and you want to keep the default MTU during migration, this step can be ignored.
  - If you used a custom MTU, and you want to keep the custom MTU during migration, you must declare the custom MTU value in this step.
  - This step does not work if you want to change the MTU value during migration. Instead, you must first follow the instructions for "Changing the cluster MTU". You can then keep the custom MTU value by performing this procedure and declaring the custom MTU value in this step.
    Note
    OpenShift-SDN and OVN-Kubernetes have different overlay overhead. MTU values should be selected by following the guidelines found on the "MTU value selection" page.
- Geneve (Generic Network Virtualization Encapsulation) overlay network port
- OVN-Kubernetes IPv4 internal subnet
To customize either of the previously noted settings, enter and customize the following command. If you do not need to change the default value, omit the key from the patch.
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "ovnKubernetesConfig":{
          "mtu":<mtu>,
          "genevePort":<port>,
          "v4InternalSubnet":"<ipv4_subnet>"
    }}}}'
```
Copy to Clipboard
where:
mtu
The MTU for the Geneve overlay network. This value is normally configured automatically, but if the nodes in your cluster do not all use the same MTU, then you must set this explicitly to 100 less than the smallest node MTU value.
port
The UDP port for the Geneve overlay network. If a value is not specified, the default is 6081. The port cannot be the same as the VXLAN port that is used by OpenShift SDN. The default value for the VXLAN port is 4789.
ipv4_subnet
An IPv4 address range for internal use by OVN-Kubernetes. You must ensure that the IP address range does not overlap with any other subnet used by your OpenShift Container Platform installation. The IP address range must be larger than the maximum number of nodes that can be added to the cluster. The default value is 100.64.0.0/16.
Example patch command to update mtu field
```
oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
```
```
$ oc patch Network.operator.openshift.io cluster --type=merge \
  --patch '{
    "spec":{
      "defaultNetwork":{
        "ovnKubernetesConfig":{
          "mtu":1200
    }}}}'
```
Copy to Clipboard
As the MCO updates machines in each machine config pool, it reboots each node one by one. You must wait until all the nodes are updated. Check the machine config pool status by entering the following command:
```
oc get mcp
```
```
$ oc get mcp
```
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A successfully updated node has the following status: UPDATED=true, UPDATING=false, DEGRADED=false.
Note
By default, the MCO updates one machine per pool at a time, causing the total time the migration takes to increase with the size of the cluster.

Confirm the status of the new machine configuration on the hosts:

To list the machine configuration state and the name of the applied machine configuration, enter the following command:

oc describe node | egrep "hostname|machineconfig"

$ oc describe node | egrep "hostname|machineconfig"

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Example output

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

kubernetes.io/hostname=master-0
machineconfiguration.openshift.io/currentConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/desiredConfig: rendered-master-c53e221d9d24e1c8bb6ee89dd3d8ad7b
machineconfiguration.openshift.io/reason:
machineconfiguration.openshift.io/state: Done

Copy to Clipboard

Verify that the following statements are true:

The value of machineconfiguration.openshift.io/state field is Done.
The value of the machineconfiguration.openshift.io/currentConfig field is equal to the value of the machineconfiguration.openshift.io/desiredConfig field.

To confirm that the machine config is correct, enter the following command:
```
oc get machineconfig <config_name> -o yaml | grep ExecStart
```
```
$ oc get machineconfig <config_name> -o yaml | grep ExecStart
```
Copy to Clipboard
where <config_name> is the name of the machine config from the machineconfiguration.openshift.io/currentConfig field.
The machine config must include the following update to the systemd configuration:
```
ExecStart=/usr/local/bin/configure-ovs.sh OVNKubernetes
```
```
ExecStart=/usr/local/bin/configure-ovs.sh OVNKubernetes
```
Copy to Clipboard

If a node is stuck in the NotReady state, investigate the machine config daemon pod logs and resolve any errors.

To list the pods, enter the following command:

oc get pod -n openshift-machine-config-operator

$ oc get pod -n openshift-machine-config-operator

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Example output

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

NAME                                         READY   STATUS    RESTARTS   AGE
machine-config-controller-75f756f89d-sjp8b   1/1     Running   0          37m
machine-config-daemon-5cf4b                  2/2     Running   0          43h
machine-config-daemon-7wzcd                  2/2     Running   0          43h
machine-config-daemon-fc946                  2/2     Running   0          43h
machine-config-daemon-g2v28                  2/2     Running   0          43h
machine-config-daemon-gcl4f                  2/2     Running   0          43h
machine-config-daemon-l5tnv                  2/2     Running   0          43h
machine-config-operator-79d9c55d5-hth92      1/1     Running   0          37m
machine-config-server-bsc8h                  1/1     Running   0          43h
machine-config-server-hklrm                  1/1     Running   0          43h
machine-config-server-k9rtx                  1/1     Running   0          43h

Copy to Clipboard

The names for the config daemon pods are in the following format: machine-config-daemon-<seq>. The <seq> value is a random five character alphanumeric sequence.

Display the pod log for the first machine config daemon pod shown in the previous output by enter the following command:
```
oc logs <pod> -n openshift-machine-config-operator
```
```
$ oc logs <pod> -n openshift-machine-config-operator
```
Copy to Clipboard
where pod is the name of a machine config daemon pod.
Resolve any errors in the logs shown by the output from the previous command.

To start the migration, configure the OVN-Kubernetes network plugin by using one of the following commands:
- To specify the network provider without changing the cluster network IP address block, enter the following command:
  $ oc patch Network.config.openshift.io cluster \ --type='merge' --patch '{ "spec": { "networkType": "OVNKubernetes" } }'
  Copy to Clipboard
- To specify a different cluster network IP address block, enter the following command:
  $ oc patch Network.config.openshift.io cluster \ --type='merge' --patch '{ "spec": { "clusterNetwork": [ { "cidr": "<cidr>", "hostPrefix": <prefix> } ], "networkType": "OVNKubernetes" } }'
  Copy to Clipboard
  where cidr is a CIDR block and prefix is the slice of the CIDR block apportioned to each node in your cluster. You cannot use any CIDR block that overlaps with the 100.64.0.0/16 CIDR block because the OVN-Kubernetes network provider uses this block internally.
  Important
  You cannot change the service network address block during the migration.

Verify that the Multus daemon set rollout is complete before continuing with subsequent steps:

oc -n openshift-multus rollout status daemonset/multus

$ oc -n openshift-multus rollout status daemonset/multus

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The name of the Multus pods is in the form of multus-<xxxxx> where <xxxxx> is a random sequence of letters. It might take several moments for the pods to restart.

Example output

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

Waiting for daemon set "multus" rollout to finish: 1 out of 6 new pods have been updated...
...
Waiting for daemon set "multus" rollout to finish: 5 of 6 updated pods are available...
daemon set "multus" successfully rolled out

Copy to Clipboard

To complete changing the network plugin, reboot each node in your cluster. You can reboot the nodes in your cluster with either of the following approaches:

Important

The following scripts reboot all of the nodes in the cluster at the same time. This can cause your cluster to be unstable. Another option is to reboot your nodes manually one at a time. Rebooting nodes one-by-one causes considerable downtime in a cluster with many nodes.

Cluster Operators will not work correctly before you reboot the nodes.

With the oc rsh command, you can use a bash script similar to the following:

#!/bin/bash
readarray -t POD_NODES <<< "$(oc get pod -n openshift-machine-config-operator -o wide| grep daemon|awk '{print $1" "$7}')"

for i in "${POD_NODES[@]}"
do
  read -r POD NODE <<< "$i"
  until oc rsh -n openshift-machine-config-operator "$POD" chroot /rootfs shutdown -r +1
    do
      echo "cannot reboot node $NODE, retry" && sleep 3
    done
done

#!/bin/bash
readarray -t POD_NODES <<< "$(oc get pod -n openshift-machine-config-operator -o wide| grep daemon|awk '{print $1" "$7}')"

for i in "${POD_NODES[@]}"
do
  read -r POD NODE <<< "$i"
  until oc rsh -n openshift-machine-config-operator "$POD" chroot /rootfs shutdown -r +1
    do
      echo "cannot reboot node $NODE, retry" && sleep 3
    done
done

Copy to Clipboard

With the ssh command, you can use a bash script similar to the following. The script assumes that you have configured sudo to not prompt for a password.

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

#!/bin/bash

for ip in $(oc get nodes  -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}')
do
   echo "reboot node $ip"
   ssh -o StrictHostKeyChecking=no core@$ip sudo shutdown -r -t 3
done

Copy to Clipboard

Confirm that the migration succeeded:
1. To confirm that the network plugin is OVN-Kubernetes, enter the following command. The value of status.networkType must be OVNKubernetes.
  $ oc get network.config/cluster -o jsonpath='{.status.networkType}{"\n"}'
  Copy to Clipboard
2. To confirm that the cluster nodes are in the Ready state, enter the following command:
  $ oc get nodes
  Copy to Clipboard
3. To confirm that your pods are not in an error state, enter the following command:
  $ oc get pods --all-namespaces -o wide --sort-by='{.spec.nodeName}'
  Copy to Clipboard
  If pods on a node are in an error state, reboot that node.
4. To confirm that all of the cluster Operators are not in an abnormal state, enter the following command:
  $ oc get co
  Copy to Clipboard
  The status of every cluster Operator must be the following: AVAILABLE="True", PROGRESSING="False", DEGRADED="False". If a cluster Operator is not available or degraded, check the logs for the cluster Operator for more information.

Complete the following steps only if the migration succeeds and your cluster is in a good state:

To remove the migration configuration from the CNO configuration object, enter the following command:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "migration": null } }'

Copy to Clipboard

To remove custom configuration for the OpenShift SDN network provider, enter the following command:

oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "defaultNetwork": { "openshiftSDNConfig": null } } }'

$ oc patch Network.operator.openshift.io cluster --type='merge' \
  --patch '{ "spec": { "defaultNetwork": { "openshiftSDNConfig": null } } }'

Copy to Clipboard

To remove the OpenShift SDN network provider namespace, enter the following command:
```
oc delete namespace openshift-sdn
```
```
$ oc delete namespace openshift-sdn
```
Copy to Clipboard
After a successful migration operation, remove the network.openshift.io/network-type-migration- annotation from the network.config custom resource by entering the following command:
```
oc annotate network.config cluster network.openshift.io/network-type-migration-
```
```
$ oc annotate network.config cluster network.openshift.io/network-type-migration-
```
Copy to Clipboard

Next steps

Optional: After cluster migration, you can convert your IPv4 single-stack cluster to a dual-network cluster network that supports IPv4 and IPv6 address families. For more information, see "Converting to IPv4/IPv6 dual-stack networking".

26.4. Configuring egress IPs for a project

As a cluster administrator, you can configure the OpenShift SDN Container Network Interface (CNI) network plugin to assign one or more egress IP addresses to a project.

26.4.1. Egress IP address architectural design and implementation

The OpenShift Container Platform egress IP address functionality allows you to ensure that the traffic from one or more pods in one or more namespaces has a consistent source IP address for services outside the cluster network.

For example, you might have a pod that periodically queries a database that is hosted on a server outside of your cluster. To enforce access requirements for the server, a packet filtering device is configured to allow traffic only from specific IP addresses. To ensure that you can reliably allow access to the server from only that specific pod, you can configure a specific egress IP address for the pod that makes the requests to the server.

An egress IP address assigned to a namespace is different from an egress router, which is used to send traffic to specific destinations.

In some cluster configurations, application pods and ingress router pods run on the same node. If you configure an egress IP address for an application project in this scenario, the IP address is not used when you send a request to a route from the application project.

An egress IP address is implemented as an additional IP address on the primary network interface of a node and must be in the same subnet as the primary IP address of the node. The additional IP address must not be assigned to any other node in the cluster.

Important

Egress IP addresses must not be configured in any Linux network configuration files, such as ifcfg-eth0.

26.4.1.1. Platform support

Support for the egress IP address functionality on various platforms is summarized in the following table:

Platform	Supported
Bare metal	Yes
VMware vSphere	Yes
Red Hat OpenStack Platform (RHOSP)	Yes
Amazon Web Services (AWS)	Yes
Google Cloud Platform (GCP)	Yes
Microsoft Azure	Yes
IBM Z and IBM® LinuxONE	Yes
IBM Z and IBM® LinuxONE for Red Hat Enterprise Linux (RHEL) KVM	Yes
IBM Power	Yes

Important

The assignment of egress IP addresses to control plane nodes with the EgressIP feature is not supported on a cluster provisioned on Amazon Web Services (AWS). (BZ#2039656)

26.4.1.2. Public cloud platform considerations

Typically, public cloud providers place a limit on egress IPs. This means that there is a constraint on the absolute number of assignable IP addresses per node for clusters provisioned on public cloud infrastructure. The maximum number of assignable IP addresses per node, or the IP capacity, can be described in the following formula:

IP capacity = public cloud default capacity - sum(current IP assignments)

IP capacity = public cloud default capacity - sum(current IP assignments)

Copy to Clipboard

While the Egress IPs capability manages the IP address capacity per node, it is important to plan for this constraint in your deployments. For example, if a public cloud provider limits IP address capacity to 10 IP addresses per node, and you have 8 nodes, the total number of assignable IP addresses is only 80. To achieve a higher IP address capacity, you would need to allocate additional nodes. For example, if you needed 150 assignable IP addresses, you would need to allocate 7 additional nodes.

To confirm the IP capacity and subnets for any node in your public cloud environment, you can enter the oc get node <node_name> -o yaml command. The cloud.network.openshift.io/egress-ipconfig annotation includes capacity and subnet information for the node.

The annotation value is an array with a single object with fields that provide the following information for the primary network interface:

interface: Specifies the interface ID on AWS and Azure and the interface name on GCP.
ifaddr: Specifies the subnet mask for one or both IP address families.
capacity: Specifies the IP address capacity for the node. On AWS, the IP address capacity is provided per IP address family. On Azure and GCP, the IP address capacity includes both IPv4 and IPv6 addresses.

Automatic attachment and detachment of egress IP addresses for traffic between nodes are available. This allows for traffic from many pods in namespaces to have a consistent source IP address to locations outside of the cluster. This also supports OpenShift SDN and OVN-Kubernetes, which is the default networking plugin in Red Hat OpenShift Networking in OpenShift Container Platform 4.13.

Note

The RHOSP egress IP address feature creates a Neutron reservation port called egressip-<IP address>. Using the same RHOSP user as the one used for the OpenShift Container Platform cluster installation, you can assign a floating IP address to this reservation port to have a predictable SNAT address for egress traffic. When an egress IP address on an RHOSP network is moved from one node to another, because of a node failover, for example, the Neutron reservation port is removed and recreated. This means that the floating IP association is lost and you need to manually reassign the floating IP address to the new reservation port.

Note

When an RHOSP cluster administrator assigns a floating IP to the reservation port, OpenShift Container Platform cannot delete the reservation port. The CloudPrivateIPConfig object cannot perform delete and move operations until an RHOSP cluster administrator unassigns the floating IP from the reservation port.

The following examples illustrate the annotation from nodes on several public cloud providers. The annotations are indented for readability.

Example cloud.network.openshift.io/egress-ipconfig annotation on AWS

cloud.network.openshift.io/egress-ipconfig: [
  {
    "interface":"eni-078d267045138e436",
    "ifaddr":{"ipv4":"10.0.128.0/18"},
    "capacity":{"ipv4":14,"ipv6":15}
  }
]

cloud.network.openshift.io/egress-ipconfig: [
  {
    "interface":"eni-078d267045138e436",
    "ifaddr":{"ipv4":"10.0.128.0/18"},
    "capacity":{"ipv4":14,"ipv6":15}
  }
]

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Example cloud.network.openshift.io/egress-ipconfig annotation on GCP

cloud.network.openshift.io/egress-ipconfig: [
  {
    "interface":"nic0",
    "ifaddr":{"ipv4":"10.0.128.0/18"},
    "capacity":{"ip":14}
  }
]

cloud.network.openshift.io/egress-ipconfig: [
  {
    "interface":"nic0",
    "ifaddr":{"ipv4":"10.0.128.0/18"},
    "capacity":{"ip":14}
  }
]

Copy to Clipboard

The following sections describe the IP address capacity for supported public cloud environments for use in your capacity calculation.

26.4.1.2.1. Amazon Web Services (AWS) IP address capacity limits

On AWS, constraints on IP address assignments depend on the instance type configured. For more information, see IP addresses per network interface per instance type

26.4.1.2.2. Google Cloud Platform (GCP) IP address capacity limits

On GCP, the networking model implements additional node IP addresses through IP address aliasing, rather than IP address assignments. However, IP address capacity maps directly to IP aliasing capacity.

The following capacity limits exist for IP aliasing assignment:

Per node, the maximum number of IP aliases, both IPv4 and IPv6, is 100.
Per VPC, the maximum number of IP aliases is unspecified, but OpenShift Container Platform scalability testing reveals the maximum to be approximately 15,000.

For more information, see Per instance quotas and Alias IP ranges overview.

26.4.1.2.3. Microsoft Azure IP address capacity limits

On Azure, the following capacity limits exist for IP address assignment:

Per NIC, the maximum number of assignable IP addresses, for both IPv4 and IPv6, is 256.
Per virtual network, the maximum number of assigned IP addresses cannot exceed 65,536.

For more information, see Networking limits.

26.4.1.3. Limitations

The following limitations apply when using egress IP addresses with the OpenShift SDN network plugin:

You cannot use manually assigned and automatically assigned egress IP addresses on the same nodes.
If you manually assign egress IP addresses from an IP address range, you must not make that range available for automatic IP assignment.
You cannot share egress IP addresses across multiple namespaces using the OpenShift SDN egress IP address implementation.

If you need to share IP addresses across namespaces, the OVN-Kubernetes network plugin egress IP address implementation allows you to span IP addresses across multiple namespaces.

Note

If you use OpenShift SDN in multitenant mode, you cannot use egress IP addresses with any namespace that is joined to another namespace by the projects that are associated with them. For example, if project1 and project2 are joined by running the oc adm pod-network join-projects --to=project1 project2 command, neither project can use an egress IP address. For more information, see BZ#1645577.

26.4.1.4. IP address assignment approaches

You can assign egress IP addresses to namespaces by setting the egressIPs parameter of the NetNamespace object. After an egress IP address is associated with a project, OpenShift SDN allows you to assign egress IP addresses to hosts in two ways:

In the automatically assigned approach, an egress IP address range is assigned to a node.
In the manually assigned approach, a list of one or more egress IP address is assigned to a node.

Namespaces that request an egress IP address are matched with nodes that can host those egress IP addresses, and then the egress IP addresses are assigned to those nodes. If the egressIPs parameter is set on a NetNamespace object, but no node hosts that egress IP address, then egress traffic from the namespace will be dropped.

High availability of nodes is automatic. If a node that hosts an egress IP address is unreachable and there are nodes that are able to host that egress IP address, then the egress IP address will move to a new node. When the unreachable node comes back online, the egress IP address automatically moves to balance egress IP addresses across nodes.

26.4.1.4.1. Considerations when using automatically assigned egress IP addresses

When using the automatic assignment approach for egress IP addresses the following considerations apply:

You set the egressCIDRs parameter of each node’s HostSubnet resource to indicate the range of egress IP addresses that can be hosted by a node. OpenShift Container Platform sets the egressIPs parameter of the HostSubnet resource based on the IP address range you specify.

If the node hosting the namespace’s egress IP address is unreachable, OpenShift Container Platform will reassign the egress IP address to another node with a compatible egress IP address range. The automatic assignment approach works best for clusters installed in environments with flexibility in associating additional IP addresses with nodes.

26.4.1.4.2. Considerations when using manually assigned egress IP addresses

This approach allows you to control which nodes can host an egress IP address.

Note

If your cluster is installed on public cloud infrastructure, you must ensure that each node that you assign egress IP addresses to has sufficient spare capacity to host the IP addresses. For more information, see "Platform considerations" in a previous section.

When using the manual assignment approach for egress IP addresses the following considerations apply:

You set the egressIPs parameter of each node’s HostSubnet resource to indicate the IP addresses that can be hosted by a node.
Multiple egress IP addresses per namespace are supported.

If a namespace has multiple egress IP addresses and those addresses are hosted on multiple nodes, the following additional considerations apply:

If a pod is on a node that is hosting an egress IP address, that pod always uses the egress IP address on the node.
If a pod is not on a node that is hosting an egress IP address, that pod uses an egress IP address at random.

26.4.2. Configuring automatically assigned egress IP addresses for a namespace

In OpenShift Container Platform you can enable automatic assignment of an egress IP address for a specific namespace across one or more nodes.

Prerequisites

You have access to the cluster as a user with the cluster-admin role.
You have installed the OpenShift CLI (oc).

Procedure

Update the NetNamespace object with the egress IP address using the following JSON:

oc patch netnamespace <project_name> --type=merge -p \
  '{

 $ oc patch netnamespace <project_name> --type=merge -p \
  '{
    "egressIPs": [
      "<ip_address>"
    ]
  }'

Copy to Clipboard

where:

<project_name>: Specifies the name of the project.
<ip_address>: Specifies one or more egress IP addresses for the egressIPs array.

For example, to assign project1 to an IP address of 192.168.1.100 and project2 to an IP address of 192.168.1.101:

oc patch netnamespace project1 --type=merge -p \
  '{"egressIPs": ["192.168.1.100"]}'
oc patch netnamespace project2 --type=merge -p \
  '{"egressIPs": ["192.168.1.101"]}'

$ oc patch netnamespace project1 --type=merge -p \
  '{"egressIPs": ["192.168.1.100"]}'
$ oc patch netnamespace project2 --type=merge -p \
  '{"egressIPs": ["192.168.1.101"]}'

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Note

Because OpenShift SDN manages the NetNamespace object, you can make changes only by modifying the existing NetNamespace object. Do not create a new NetNamespace object.

Indicate which nodes can host egress IP addresses by setting the egressCIDRs parameter for each host using the following JSON:
```
oc patch hostsubnet <node_name> --type=merge -p \
  '{
```
```
$ oc patch hostsubnet <node_name> --type=merge -p \
  '{
    "egressCIDRs": [
      "<ip_address_range>", "<ip_address_range>"
    ]
  }'
```
Copy to Clipboard
where:
<node_name>
Specifies a node name.
<ip_address_range>
Specifies an IP address range in CIDR format. You can specify more than one address range for the egressCIDRs array.
For example, to set node1 and node2 to host egress IP addresses in the range 192.168.1.0 to 192.168.1.255:
```
oc patch hostsubnet node1 --type=merge -p \
  '{"egressCIDRs": ["192.168.1.0/24"]}'
oc patch hostsubnet node2 --type=merge -p \
  '{"egressCIDRs": ["192.168.1.0/24"]}'
```
```
$ oc patch hostsubnet node1 --type=merge -p \
  '{"egressCIDRs": ["192.168.1.0/24"]}'
$ oc patch hostsubnet node2 --type=merge -p \
  '{"egressCIDRs": ["192.168.1.0/24"]}'
```
Copy to Clipboard
OpenShift Container Platform automatically assigns specific egress IP addresses to available nodes in a balanced way. In this case, it assigns the egress IP address 192.168.1.100 to node1 and the egress IP address 192.168.1.101 to node2 or vice versa.

26.4.3. Configuring manually assigned egress IP addresses for a namespace

In OpenShift Container Platform you can associate one or more egress IP addresses with a namespace.

Prerequisites

You have access to the cluster as a user with the cluster-admin role.
You have installed the OpenShift CLI (oc).

Procedure

Update the NetNamespace object by specifying the following JSON object with the desired IP addresses:
```
oc patch netnamespace <project_name> --type=merge -p \
  '{
```
```
 $ oc patch netnamespace <project_name> --type=merge -p \
  '{
    "egressIPs": [
      "<ip_address>"
    ]
  }'
```
Copy to Clipboard
where:
<project_name>
Specifies the name of the project.
<ip_address>
Specifies one or more egress IP addresses for the egressIPs array.
For example, to assign the project1 project to the IP addresses 192.168.1.100 and 192.168.1.101:
```
oc patch netnamespace project1 --type=merge \
  -p '{"egressIPs": ["192.168.1.100","192.168.1.101"]}'
```
```
$ oc patch netnamespace project1 --type=merge \
  -p '{"egressIPs": ["192.168.1.100","192.168.1.101"]}'
```
Copy to Clipboard
To provide high availability, set the egressIPs value to two or more IP addresses on different nodes. If multiple egress IP addresses are set, then pods use all egress IP addresses roughly equally.
Note
Because OpenShift SDN manages the NetNamespace object, you can make changes only by modifying the existing NetNamespace object. Do not create a new NetNamespace object.
Manually assign the egress IP address to the node hosts.
If your cluster is installed on public cloud infrastructure, you must confirm that the node has available IP address capacity.
Set the egressIPs parameter on the HostSubnet object on the node host. Using the following JSON, include as many IP addresses as you want to assign to that node host:
```
oc patch hostsubnet <node_name> --type=merge -p \
  '{
```
```
$ oc patch hostsubnet <node_name> --type=merge -p \
  '{
    "egressIPs": [
      "<ip_address>",
      "<ip_address>"
      ]
  }'
```
Copy to Clipboard
where:
<node_name>
Specifies a node name.
<ip_address>
Specifies an IP address. You can specify more than one IP address for the egressIPs array.
For example, to specify that node1 should have the egress IPs 192.168.1.100, 192.168.1.101, and 192.168.1.102:
```
oc patch hostsubnet node1 --type=merge -p \
  '{"egressIPs": ["192.168.1.100", "192.168.1.101", "192.168.1.102"]}'
```
```
$ oc patch hostsubnet node1 --type=merge -p \
  '{"egressIPs": ["192.168.1.100", "192.168.1.101", "192.168.1.102"]}'
```
Copy to Clipboard
In the previous example, all egress traffic for project1 will be routed to the node hosting the specified egress IP, and then connected through Network Address Translation (NAT) to that IP address.

26.4.4. Additional resources

If you are configuring manual egress IP address assignment, see Platform considerations for information about IP capacity planning.

26.5. Configuring an egress firewall for a project

As a cluster administrator, you can create an egress firewall for a project that restricts egress traffic leaving your OpenShift Container Platform cluster.

26.5.1. How an egress firewall works in a project

As a cluster administrator, you can use an egress firewall to limit the external hosts that some or all pods can access from within the cluster. An egress firewall supports the following scenarios:

A pod can only connect to internal hosts and cannot initiate connections to the public internet.
A pod can only connect to the public internet and cannot initiate connections to internal hosts that are outside the OpenShift Container Platform cluster.
A pod cannot reach specified internal subnets or hosts outside the OpenShift Container Platform cluster.
A pod can connect to only specific external hosts.

For example, you can allow one project access to a specified IP range but deny the same access to a different project. Or you can restrict application developers from updating from Python pip mirrors, and force updates to come only from approved sources.

Note

Egress firewall does not apply to the host network namespace. Pods with host networking enabled are unaffected by egress firewall rules.

You configure an egress firewall policy by creating an EgressNetworkPolicy custom resource (CR) object. The egress firewall matches network traffic that meets any of the following criteria:

An IP address range in CIDR format
A DNS name that resolves to an IP address

Important

If your egress firewall includes a deny rule for 0.0.0.0/0, access to your OpenShift Container Platform API servers is blocked. You must either add allow rules for each IP address or use the nodeSelector type allow rule in your egress policy rules to connect to API servers.

The following example illustrates the order of the egress firewall rules necessary to ensure API server access:

apiVersion: network.openshift.io/v1
kind: EgressNetworkPolicy
metadata:
  name: default
  namespace: <namespace> 
spec:
  egress:
  - to:
      cidrSelector: <api_server_address_range> 
    type: Allow
# ...
  - to:
      cidrSelector: 0.0.0.0/0 
    type: Deny

apiVersion: network.openshift.io/v1
kind: EgressNetworkPolicy
metadata:
  name: default
  namespace: <namespace>

1


spec:
  egress:
  - to:
      cidrSelector: <api_server_address_range>

2


    type: Allow
# ...
  - to:
      cidrSelector: 0.0.0.0/0

3


    type: Deny

Copy to Clipboard

1: The namespace for the egress firewall.
2: The IP address range that includes your OpenShift Container Platform API servers.
3: A global deny rule prevents access to the OpenShift Container Platform API servers.

To find the IP address for your API servers, run oc get ep kubernetes -n default.

For more information, see BZ#1988324.

Important

You must have OpenShift SDN configured to use either the network policy or multitenant mode to configure an egress firewall.

If you use network policy mode, an egress firewall is compatible with only one policy per namespace and will not work with projects that share a network, such as global projects.

Warning

Egress firewall rules do not apply to traffic that goes through routers. Any user with permission to create a Route CR object can bypass egress firewall policy rules by creating a route that points to a forbidden destination.

26.5.1.1. Limitations of an egress firewall

An egress firewall has the following limitations:

No project can have more than one EgressNetworkPolicy object.
Important
The creation of more than one EgressNetworkPolicy object is allowed, however it should not be done. When you create more than one EgressNetworkPolicy object, the following message is returned: dropping all rules. In actuality, all external traffic is dropped, which can cause security risks for your organization.
A maximum of one EgressNetworkPolicy object with a maximum of 1,000 rules can be defined per project.
The default project cannot use an egress firewall.
When using the OpenShift SDN network plugin in multitenant mode, the following limitations apply:
- Global projects cannot use an egress firewall. You can make a project global by using the oc adm pod-network make-projects-global command.
- Projects merged by using the oc adm pod-network join-projects command cannot use an egress firewall in any of the joined projects.
If you create a selectorless service and manually define endpoints or EndpointSlices that point to external IPs, traffic to the service IP might still be allowed, even if your EgressNetworkPolicy is configured to deny all egress traffic. This occurs because OpenShift SDN does not fully enforce egress network policies for these external endpoints. Consequently, this might result in unexpected access to external services.

Violating any of these restrictions results in a broken egress firewall for the project. Consequently, all external network traffic is dropped, which can cause security risks for your organization.

An Egress Firewall resource can be created in the kube-node-lease, kube-public, kube-system, openshift and openshift- projects.

26.5.1.2. Matching order for egress firewall policy rules

The egress firewall policy rules are evaluated in the order that they are defined, from first to last. The first rule that matches an egress connection from a pod applies. Any subsequent rules are ignored for that connection.

26.5.1.3. How Domain Name Server (DNS) resolution works

If you use DNS names in any of your egress firewall policy rules, proper resolution of the domain names is subject to the following restrictions:

Domain name updates are polled based on a time-to-live (TTL) duration. By default, the duration is 30 seconds. When the egress firewall controller queries the local name servers for a domain name, if the response includes a TTL that is less than 30 seconds, the controller sets the duration to the returned value. If the TTL in the response is greater than 30 minutes, the controller sets the duration to 30 minutes. If the TTL is between 30 seconds and 30 minutes, the controller ignores the value and sets the duration to 30 seconds.
The pod must resolve the domain from the same local name servers when necessary. Otherwise the IP addresses for the domain known by the egress firewall controller and the pod can be different. If the IP addresses for a hostname differ, the egress firewall might not be enforced consistently.
Because the egress firewall controller and pods asynchronously poll the same local name server, the pod might obtain the updated IP address before the egress controller does, which causes a race condition. Due to this current limitation, domain name usage in EgressNetworkPolicy objects is only recommended for domains with infrequent IP address changes.

Note

Using DNS names in your egress firewall policy does not affect local DNS resolution through CoreDNS.

However, if your egress firewall policy uses domain names, and an external DNS server handles DNS resolution for an affected pod, you must include egress firewall rules that permit access to the IP addresses of your DNS server.

26.5.2. EgressNetworkPolicy custom resource (CR) object

You can define one or more rules for an egress firewall. A rule is either an Allow rule or a Deny rule, with a specification for the traffic that the rule applies to.

The following YAML describes an EgressNetworkPolicy CR object:

EgressNetworkPolicy object

apiVersion: network.openshift.io/v1
kind: EgressNetworkPolicy
metadata:
  name: <name> 
spec:
  egress: 
    ...

apiVersion: network.openshift.io/v1
kind: EgressNetworkPolicy
metadata:
  name: <name>

1


spec:
  egress:

2

...

Copy to Clipboard

1: A name for your egress firewall policy.
2: A collection of one or more egress network policy rules as described in the following section.

26.5.2.1. EgressNetworkPolicy rules

The following YAML describes an egress firewall rule object. The user can select either an IP address range in CIDR format, a domain name, or use the nodeSelector to allow or deny egress traffic. The egress stanza expects an array of one or more objects.

Egress policy rule stanza

egress:
- type: <type> 
  to: 
    cidrSelector: <cidr> 
    dnsName: <dns_name>

egress:
- type: <type>

1

to:

2


    cidrSelector: <cidr>

3


    dnsName: <dns_name>

4

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1: The type of rule. The value must be either Allow or Deny.
2: A stanza describing an egress traffic match rule. A value for either the cidrSelector field or the dnsName field for the rule. You cannot use both fields in the same rule.
3: An IP address range in CIDR format.
4: A domain name.

26.5.2.2. Example EgressNetworkPolicy CR objects

The following example defines several egress firewall policy rules:

apiVersion: network.openshift.io/v1
kind: EgressNetworkPolicy
metadata:
  name: default
spec:
  egress: 
  - type: Allow
    to:
      cidrSelector: 1.2.3.0/24
  - type: Allow
    to:
      dnsName: www.example.com
  - type: Deny
    to:
      cidrSelector: 0.0.0.0/0

apiVersion: network.openshift.io/v1
kind: EgressNetworkPolicy
metadata:
  name: default
spec:
  egress:

1


  - type: Allow
    to:
      cidrSelector: 1.2.3.0/24
  - type: Allow
    to:
      dnsName: www.example.com
  - type: Deny
    to:
      cidrSelector: 0.0.0.0/0

Copy to Clipboard

1: A collection of egress firewall policy rule objects.

26.5.3. Creating an egress firewall policy object

As a cluster administrator, you can create an egress firewall policy object for a project.

Important

If the project already has an EgressNetworkPolicy object defined, you must edit the existing policy to make changes to the egress firewall rules.

Prerequisites

A cluster that uses the OpenShift SDN network plugin.
Install the OpenShift CLI (oc).
You must log in to the cluster as a cluster administrator.

Procedure

Create a policy rule:
1. Create a <policy_name>.yaml file where <policy_name> describes the egress policy rules.
2. In the file you created, define an egress policy object.
Enter the following command to create the policy object. Replace <policy_name> with the name of the policy and <project> with the project that the rule applies to.
```
oc create -f <policy_name>.yaml -n <project>
```
```
$ oc create -f <policy_name>.yaml -n <project>
```
Copy to Clipboard
In the following example, a new EgressNetworkPolicy object is created in a project named project1:
```
oc create -f default.yaml -n project1
```
```
$ oc create -f default.yaml -n project1
```
Copy to Clipboard
Example output
```
egressnetworkpolicy.network.openshift.io/v1 created
```
```
egressnetworkpolicy.network.openshift.io/v1 created
```
Copy to Clipboard
Optional: Save the <policy_name>.yaml file so that you can make changes later.

26.6. Editing an egress firewall for a project

As a cluster administrator, you can modify network traffic rules for an existing egress firewall.

26.6.1. Viewing an EgressNetworkPolicy object

You can view an EgressNetworkPolicy object in your cluster.

Prerequisites

A cluster using the OpenShift SDN network plugin.
Install the OpenShift Command-line Interface (CLI), commonly known as oc.
You must log in to the cluster.

Procedure

Optional: To view the names of the EgressNetworkPolicy objects defined in your cluster, enter the following command:
```
oc get egressnetworkpolicy --all-namespaces
```
```
$ oc get egressnetworkpolicy --all-namespaces
```
Copy to Clipboard

To inspect a policy, enter the following command. Replace <policy_name> with the name of the policy to inspect.

oc describe egressnetworkpolicy <policy_name>

$ oc describe egressnetworkpolicy <policy_name>

Copy to Clipboard

Example output

Name:		default
Namespace:	project1
Created:	20 minutes ago
Labels:		<none>
Annotations:	<none>
Rule:		Allow to 1.2.3.0/24
Rule:		Allow to www.example.com
Rule:		Deny to 0.0.0.0/0

Name:		default
Namespace:	project1
Created:	20 minutes ago
Labels:		<none>
Annotations:	<none>
Rule:		Allow to 1.2.3.0/24
Rule:		Allow to www.example.com
Rule:		Deny to 0.0.0.0/0

Copy to Clipboard

26.7. Editing an egress firewall for a project

As a cluster administrator, you can modify network traffic rules for an existing egress firewall.

26.7.1. Editing an EgressNetworkPolicy object

As a cluster administrator, you can update the egress firewall for a project.

Prerequisites

A cluster using the OpenShift SDN network plugin.
Install the OpenShift CLI (oc).
You must log in to the cluster as a cluster administrator.

Procedure

Find the name of the EgressNetworkPolicy object for the project. Replace <project> with the name of the project.
```
oc get -n <project> egressnetworkpolicy
```
```
$ oc get -n <project> egressnetworkpolicy
```
Copy to Clipboard
Optional: If you did not save a copy of the EgressNetworkPolicy object when you created the egress network firewall, enter the following command to create a copy.
```
oc get -n <project> egressnetworkpolicy <name> -o yaml > <filename>.yaml
```
```
$ oc get -n <project> egressnetworkpolicy <name> -o yaml > <filename>.yaml
```
Copy to Clipboard
Replace <project> with the name of the project. Replace <name> with the name of the object. Replace <filename> with the name of the file to save the YAML to.
After making changes to the policy rules, enter the following command to replace the EgressNetworkPolicy object. Replace <filename> with the name of the file containing the updated EgressNetworkPolicy object.
```
oc replace -f <filename>.yaml
```
```
$ oc replace -f <filename>.yaml
```
Copy to Clipboard

26.8. Removing an egress firewall from a project

As a cluster administrator, you can remove an egress firewall from a project to remove all restrictions on network traffic from the project that leaves the OpenShift Container Platform cluster.

26.8.1. Removing an EgressNetworkPolicy object

As a cluster administrator, you can remove an egress firewall from a project.

Prerequisites

A cluster using the OpenShift SDN network plugin.
Install the OpenShift CLI (oc).
You must log in to the cluster as a cluster administrator.

Procedure

Find the name of the EgressNetworkPolicy object for the project. Replace <project> with the name of the project.
```
oc get -n <project> egressnetworkpolicy
```
```
$ oc get -n <project> egressnetworkpolicy
```
Copy to Clipboard
Enter the following command to delete the EgressNetworkPolicy object. Replace <project> with the name of the project and <name> with the name of the object.
```
oc delete -n <project> egressnetworkpolicy <name>
```
```
$ oc delete -n <project> egressnetworkpolicy <name>
```
Copy to Clipboard

26.9. Considerations for the use of an egress router pod

26.9.1. About an egress router pod

The OpenShift Container Platform egress router pod redirects traffic to a specified remote server from a private source IP address that is not used for any other purpose. An egress router pod can send network traffic to servers that are set up to allow access only from specific IP addresses.

Note

The egress router pod is not intended for every outgoing connection. Creating large numbers of egress router pods can exceed the limits of your network hardware. For example, creating an egress router pod for every project or application could exceed the number of local MAC addresses that the network interface can handle before reverting to filtering MAC addresses in software.

Important

The egress router image is not compatible with Amazon AWS, Azure Cloud, or any other cloud platform that does not support layer 2 manipulations due to their incompatibility with macvlan traffic.

26.9.1.1. Egress router modes

In redirect mode, an egress router pod configures iptables rules to redirect traffic from its own IP address to one or more destination IP addresses. Client pods that need to use the reserved source IP address must be configured to access the service for the egress router rather than connecting directly to the destination IP. You can access the destination service and port from the application pod by using the curl command. For example:

curl <router_service_IP> <port>

$ curl <router_service_IP> <port>

Copy to Clipboard

In HTTP proxy mode, an egress router pod runs as an HTTP proxy on port 8080. This mode only works for clients that are connecting to HTTP-based or HTTPS-based services, but usually requires fewer changes to the client pods to get them to work. Many programs can be told to use an HTTP proxy by setting an environment variable.

In DNS proxy mode, an egress router pod runs as a DNS proxy for TCP-based services from its own IP address to one or more destination IP addresses. To make use of the reserved, source IP address, client pods must be modified to connect to the egress router pod rather than connecting directly to the destination IP address. This modification ensures that external destinations treat traffic as though it were coming from a known source.

Redirect mode works for all services except for HTTP and HTTPS. For HTTP and HTTPS services, use HTTP proxy mode. For TCP-based services with IP addresses or domain names, use DNS proxy mode.

26.9.1.2. Egress router pod implementation

The egress router pod setup is performed by an initialization container. That container runs in a privileged context so that it can configure the macvlan interface and set up iptables rules. After the initialization container finishes setting up the iptables rules, it exits. Next the egress router pod executes the container to handle the egress router traffic. The image used varies depending on the egress router mode.

The environment variables determine which addresses the egress-router image uses. The image configures the macvlan interface to use EGRESS_SOURCE as its IP address, with EGRESS_GATEWAY as the IP address for the gateway.

Network Address Translation (NAT) rules are set up so that connections to the cluster IP address of the pod on any TCP or UDP port are redirected to the same port on IP address specified by the EGRESS_DESTINATION variable.

If only some of the nodes in your cluster are capable of claiming the specified source IP address and using the specified gateway, you can specify a nodeName or nodeSelector to identify which nodes are acceptable.

26.9.1.3. Deployment considerations

An egress router pod adds an additional IP address and MAC address to the primary network interface of the node. As a result, you might need to configure your hypervisor or cloud provider to allow the additional address.

Red Hat OpenStack Platform (RHOSP)

If you deploy OpenShift Container Platform on RHOSP, you must allow traffic from the IP and MAC addresses of the egress router pod on your OpenStack environment. If you do not allow the traffic, then communication will fail:

openstack port set --allowed-address \
  ip_address=<ip_address>,mac_address=<mac_address> <neutron_port_uuid>

$ openstack port set --allowed-address \
  ip_address=<ip_address>,mac_address=<mac_address> <neutron_port_uuid>

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Red Hat Virtualization (RHV)

If you are using RHV, you must select No Network Filter for the Virtual network interface controller (vNIC).

VMware vSphere

If you are using VMware vSphere, see the VMware documentation for securing vSphere standard switches. View and change VMware vSphere default settings by selecting the host virtual switch from the vSphere Web Client.

Specifically, ensure that the following are enabled:

26.9.1.4. Failover configuration

To avoid downtime, you can deploy an egress router pod with a Deployment resource, as in the following example. To create a new Service object for the example deployment, use the oc expose deployment/egress-demo-controller command.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: egress-demo-controller
spec:
  replicas: 1 
  selector:
    matchLabels:
      name: egress-router
  template:
    metadata:
      name: egress-router
      labels:
        name: egress-router
      annotations:
        pod.network.openshift.io/assign-macvlan: "true"
    spec: 
      initContainers:
        ...
      containers:
        ...

apiVersion: apps/v1
kind: Deployment
metadata:
  name: egress-demo-controller
spec:
  replicas: 1

1


  selector:
    matchLabels:
      name: egress-router
  template:
    metadata:
      name: egress-router
      labels:
        name: egress-router
      annotations:
        pod.network.openshift.io/assign-macvlan: "true"
    spec:

2


      initContainers:
        ...
      containers:
        ...

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1: Ensure that replicas is set to 1, because only one pod can use a given egress source IP address at any time. This means that only a single copy of the router runs on a node.
2: Specify the Pod object template for the egress router pod.

26.10. Deploying an egress router pod in redirect mode

As a cluster administrator, you can deploy an egress router pod that is configured to redirect traffic to specified destination IP addresses.

26.10.1. Egress router pod specification for redirect mode

Define the configuration for an egress router pod in the Pod object. The following YAML describes the fields for the configuration of an egress router pod in redirect mode:

apiVersion: v1
kind: Pod
metadata:
  name: egress-1
  labels:
    name: egress-1
  annotations:
    pod.network.openshift.io/assign-macvlan: "true" 
spec:
  initContainers:
  - name: egress-router
    image: registry.redhat.io/openshift4/ose-egress-router
    securityContext:
      privileged: true
    env:
    - name: EGRESS_SOURCE 
      value: <egress_router>
    - name: EGRESS_GATEWAY 
      value: <egress_gateway>
    - name: EGRESS_DESTINATION 
      value: <egress_destination>
    - name: EGRESS_ROUTER_MODE
      value: init
  containers:
  - name: egress-router-wait
    image: registry.redhat.io/openshift4/ose-pod

apiVersion: v1
kind: Pod
metadata:
  name: egress-1
  labels:
    name: egress-1
  annotations:
    pod.network.openshift.io/assign-macvlan: "true"

1


spec:
  initContainers:
  - name: egress-router
    image: registry.redhat.io/openshift4/ose-egress-router
    securityContext:
      privileged: true
    env:
    - name: EGRESS_SOURCE

2


      value: <egress_router>
    - name: EGRESS_GATEWAY

3


      value: <egress_gateway>
    - name: EGRESS_DESTINATION

4


      value: <egress_destination>
    - name: EGRESS_ROUTER_MODE
      value: init
  containers:
  - name: egress-router-wait
    image: registry.redhat.io/openshift4/ose-pod

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1: The annotation tells OpenShift Container Platform to create a macvlan network interface on the primary network interface controller (NIC) and move that macvlan interface into the pod’s network namespace. You must include the quotation marks around the "true" value. To have OpenShift Container Platform create the macvlan interface on a different NIC interface, set the annotation value to the name of that interface. For example, eth1.
2: IP address from the physical network that the node is on that is reserved for use by the egress router pod. Optional: You can include the subnet length, the /24 suffix, so that a proper route to the local subnet is set. If you do not specify a subnet length, then the egress router can access only the host specified with the EGRESS_GATEWAY variable and no other hosts on the subnet.
3: Same value as the default gateway used by the node.
4: External server to direct traffic to. Using this example, connections to the pod are redirected to 203.0.113.25, with a source IP address of 192.168.12.99.

Example egress router pod specification

apiVersion: v1
kind: Pod
metadata:
  name: egress-multi
  labels:
    name: egress-multi
  annotations:
    pod.network.openshift.io/assign-macvlan: "true"
spec:
  initContainers:
  - name: egress-router
    image: registry.redhat.io/openshift4/ose-egress-router
    securityContext:
      privileged: true
    env:
    - name: EGRESS_SOURCE
      value: 192.168.12.99/24
    - name: EGRESS_GATEWAY
      value: 192.168.12.1
    - name: EGRESS_DESTINATION
      value: |
        80   tcp 203.0.113.25
        8080 tcp 203.0.113.26 80
        8443 tcp 203.0.113.26 443
        203.0.113.27
    - name: EGRESS_ROUTER_MODE
      value: init
  containers:
  - name: egress-router-wait
    image: registry.redhat.io/openshift4/ose-pod

apiVersion: v1
kind: Pod
metadata:
  name: egress-multi
  labels:
    name: egress-multi
  annotations:
    pod.network.openshift.io/assign-macvlan: "true"
spec:
  initContainers:
  - name: egress-router
    image: registry.redhat.io/openshift4/ose-egress-router
    securityContext:
      privileged: true
    env:
    - name: EGRESS_SOURCE
      value: 192.168.12.99/24
    - name: EGRESS_GATEWAY
      value: 192.168.12.1
    - name: EGRESS_DESTINATION
      value: |
        80   tcp 203.0.113.25
        8080 tcp 203.0.113.26 80
        8443 tcp 203.0.113.26 443
        203.0.113.27
    - name: EGRESS_ROUTER_MODE
      value: init
  containers:
  - name: egress-router-wait
    image: registry.redhat.io/openshift4/ose-pod

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26.10.2. Egress destination configuration format

When an egress router pod is deployed in redirect mode, you can specify redirection rules by using one or more of the following formats:

<port> <protocol> <ip_address> - Incoming connections to the given <port> should be redirected to the same port on the given <ip_address>. <protocol> is either tcp or udp.
<port> <protocol> <ip_address> <remote_port> - As above, except that the connection is redirected to a different <remote_port> on <ip_address>.
<ip_address> - If the last line is a single IP address, then any connections on any other port will be redirected to the corresponding port on that IP address. If there is no fallback IP address then connections on other ports are rejected.

In the example that follows several rules are defined:

The first line redirects traffic from local port 80 to port 80 on 203.0.113.25.
The second and third lines redirect local ports 8080 and 8443 to remote ports 80 and 443 on 203.0.113.26.
The last line matches traffic for any ports not specified in the previous rules.

Example configuration

80   tcp 203.0.113.25
8080 tcp 203.0.113.26 80
8443 tcp 203.0.113.26 443
203.0.113.27

80   tcp 203.0.113.25
8080 tcp 203.0.113.26 80
8443 tcp 203.0.113.26 443
203.0.113.27

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26.10.3. Deploying an egress router pod in redirect mode

In redirect mode, an egress router pod sets up iptables rules to redirect traffic from its own IP address to one or more destination IP addresses. Client pods that need to use the reserved source IP address must be configured to access the service for the egress router rather than connecting directly to the destination IP. You can access the destination service and port from the application pod by using the curl command. For example:

curl <router_service_IP> <port>

$ curl <router_service_IP> <port>

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Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create an egress router pod.

To ensure that other pods can find the IP address of the egress router pod, create a service to point to the egress router pod, as in the following example:

apiVersion: v1
kind: Service
metadata:
  name: egress-1
spec:
  ports:
  - name: http
    port: 80
  - name: https
    port: 443
  type: ClusterIP
  selector:
    name: egress-1

apiVersion: v1
kind: Service
metadata:
  name: egress-1
spec:
  ports:
  - name: http
    port: 80
  - name: https
    port: 443
  type: ClusterIP
  selector:
    name: egress-1

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Your pods can now connect to this service. Their connections are redirected to the corresponding ports on the external server, using the reserved egress IP address.

26.11. Deploying an egress router pod in HTTP proxy mode

As a cluster administrator, you can deploy an egress router pod configured to proxy traffic to specified HTTP and HTTPS-based services.

26.11.1. Egress router pod specification for HTTP mode

Define the configuration for an egress router pod in the Pod object. The following YAML describes the fields for the configuration of an egress router pod in HTTP mode:

apiVersion: v1
kind: Pod
metadata:
  name: egress-1
  labels:
    name: egress-1
  annotations:
    pod.network.openshift.io/assign-macvlan: "true" 
spec:
  initContainers:
  - name: egress-router
    image: registry.redhat.io/openshift4/ose-egress-router
    securityContext:
      privileged: true
    env:
    - name: EGRESS_SOURCE 
      value: <egress-router>
    - name: EGRESS_GATEWAY 
      value: <egress-gateway>
    - name: EGRESS_ROUTER_MODE
      value: http-proxy
  containers:
  - name: egress-router-pod
    image: registry.redhat.io/openshift4/ose-egress-http-proxy
    env:
    - name: EGRESS_HTTP_PROXY_DESTINATION 
      value: |-
        ...
    ...

apiVersion: v1
kind: Pod
metadata:
  name: egress-1
  labels:
    name: egress-1
  annotations:
    pod.network.openshift.io/assign-macvlan: "true"

1


spec:
  initContainers:
  - name: egress-router
    image: registry.redhat.io/openshift4/ose-egress-router
    securityContext:
      privileged: true
    env:
    - name: EGRESS_SOURCE

2


      value: <egress-router>
    - name: EGRESS_GATEWAY

3


      value: <egress-gateway>
    - name: EGRESS_ROUTER_MODE
      value: http-proxy
  containers:
  - name: egress-router-pod
    image: registry.redhat.io/openshift4/ose-egress-http-proxy
    env:
    - name: EGRESS_HTTP_PROXY_DESTINATION

4


      value: |-
        ...
    ...

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1: The annotation tells OpenShift Container Platform to create a macvlan network interface on the primary network interface controller (NIC) and move that macvlan interface into the pod’s network namespace. You must include the quotation marks around the "true" value. To have OpenShift Container Platform create the macvlan interface on a different NIC interface, set the annotation value to the name of that interface. For example, eth1.
2: IP address from the physical network that the node is on that is reserved for use by the egress router pod. Optional: You can include the subnet length, the /24 suffix, so that a proper route to the local subnet is set. If you do not specify a subnet length, then the egress router can access only the host specified with the EGRESS_GATEWAY variable and no other hosts on the subnet.
3: Same value as the default gateway used by the node.
4: A string or YAML multi-line string specifying how to configure the proxy. Note that this is specified as an environment variable in the HTTP proxy container, not with the other environment variables in the init container.

26.11.2. Egress destination configuration format

When an egress router pod is deployed in HTTP proxy mode, you can specify redirection rules by using one or more of the following formats. Each line in the configuration specifies one group of connections to allow or deny:

An IP address allows connections to that IP address, such as 192.168.1.1.
A CIDR range allows connections to that CIDR range, such as 192.168.1.0/24.
A hostname allows proxying to that host, such as www.example.com.
A domain name preceded by *. allows proxying to that domain and all of its subdomains, such as *.example.com.
A ! followed by any of the previous match expressions denies the connection instead.
If the last line is *, then anything that is not explicitly denied is allowed. Otherwise, anything that is not allowed is denied.

You can also use * to allow connections to all remote destinations.

Example configuration

!*.example.com
!192.168.1.0/24
192.168.2.1
*

!*.example.com
!192.168.1.0/24
192.168.2.1
*

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26.11.3. Deploying an egress router pod in HTTP proxy mode

In HTTP proxy mode, an egress router pod runs as an HTTP proxy on port 8080. This mode only works for clients that are connecting to HTTP-based or HTTPS-based services, but usually requires fewer changes to the client pods to get them to work. Many programs can be told to use an HTTP proxy by setting an environment variable.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create an egress router pod.

To ensure that other pods can find the IP address of the egress router pod, create a service to point to the egress router pod, as in the following example:

apiVersion: v1
kind: Service
metadata:
  name: egress-1
spec:
  ports:
  - name: http-proxy
    port: 8080 
  type: ClusterIP
  selector:
    name: egress-1

apiVersion: v1
kind: Service
metadata:
  name: egress-1
spec:
  ports:
  - name: http-proxy
    port: 8080

1


  type: ClusterIP
  selector:
    name: egress-1

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1: Ensure the http port is set to 8080.

To configure the client pod (not the egress proxy pod) to use the HTTP proxy, set the http_proxy or https_proxy variables:

apiVersion: v1
kind: Pod
metadata:
  name: app-1
  labels:
    name: app-1
spec:
  containers:
    env:
    - name: http_proxy
      value: http://egress-1:8080/ 
    - name: https_proxy
      value: http://egress-1:8080/
    ...

apiVersion: v1
kind: Pod
metadata:
  name: app-1
  labels:
    name: app-1
spec:
  containers:
    env:
    - name: http_proxy
      value: http://egress-1:8080/

1


    - name: https_proxy
      value: http://egress-1:8080/
    ...

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1: The service created in the previous step.

Note

Using the http_proxy and https_proxy environment variables is not necessary for all setups. If the above does not create a working setup, then consult the documentation for the tool or software you are running in the pod.

26.12. Deploying an egress router pod in DNS proxy mode

As a cluster administrator, you can deploy an egress router pod configured to proxy traffic to specified DNS names and IP addresses.

26.12.1. Egress router pod specification for DNS mode

Define the configuration for an egress router pod in the Pod object. The following YAML describes the fields for the configuration of an egress router pod in DNS mode:

apiVersion: v1
kind: Pod
metadata:
  name: egress-1
  labels:
    name: egress-1
  annotations:
    pod.network.openshift.io/assign-macvlan: "true" 
spec:
  initContainers:
  - name: egress-router
    image: registry.redhat.io/openshift4/ose-egress-router
    securityContext:
      privileged: true
    env:
    - name: EGRESS_SOURCE 
      value: <egress-router>
    - name: EGRESS_GATEWAY 
      value: <egress-gateway>
    - name: EGRESS_ROUTER_MODE
      value: dns-proxy
  containers:
  - name: egress-router-pod
    image: registry.redhat.io/openshift4/ose-egress-dns-proxy
    securityContext:
      privileged: true
    env:
    - name: EGRESS_DNS_PROXY_DESTINATION 
      value: |-
        ...
    - name: EGRESS_DNS_PROXY_DEBUG 
      value: "1"
    ...

apiVersion: v1
kind: Pod
metadata:
  name: egress-1
  labels:
    name: egress-1
  annotations:
    pod.network.openshift.io/assign-macvlan: "true"

1


spec:
  initContainers:
  - name: egress-router
    image: registry.redhat.io/openshift4/ose-egress-router
    securityContext:
      privileged: true
    env:
    - name: EGRESS_SOURCE

2


      value: <egress-router>
    - name: EGRESS_GATEWAY

3


      value: <egress-gateway>
    - name: EGRESS_ROUTER_MODE
      value: dns-proxy
  containers:
  - name: egress-router-pod
    image: registry.redhat.io/openshift4/ose-egress-dns-proxy
    securityContext:
      privileged: true
    env:
    - name: EGRESS_DNS_PROXY_DESTINATION

4


      value: |-
        ...
    - name: EGRESS_DNS_PROXY_DEBUG

5


      value: "1"
    ...

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1: The annotation tells OpenShift Container Platform to create a macvlan network interface on the primary network interface controller (NIC) and move that macvlan interface into the pod’s network namespace. You must include the quotation marks around the "true" value. To have OpenShift Container Platform create the macvlan interface on a different NIC interface, set the annotation value to the name of that interface. For example, eth1.
2: IP address from the physical network that the node is on that is reserved for use by the egress router pod. Optional: You can include the subnet length, the /24 suffix, so that a proper route to the local subnet is set. If you do not specify a subnet length, then the egress router can access only the host specified with the EGRESS_GATEWAY variable and no other hosts on the subnet.
3: Same value as the default gateway used by the node.
4: Specify a list of one or more proxy destinations.
5: Optional: Specify to output the DNS proxy log output to stdout.

26.12.2. Egress destination configuration format

When the router is deployed in DNS proxy mode, you specify a list of port and destination mappings. A destination may be either an IP address or a DNS name.

An egress router pod supports the following formats for specifying port and destination mappings:

Port and remote address: You can specify a source port and a destination host by using the two field format: <port> <remote_address>.

The host can be an IP address or a DNS name. If a DNS name is provided, DNS resolution occurs at runtime. For a given host, the proxy connects to the specified source port on the destination host when connecting to the destination host IP address.

Port and remote address pair example

80 172.16.12.11
100 example.com

80 172.16.12.11
100 example.com

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Port, remote address, and remote port: You can specify a source port, a destination host, and a destination port by using the three field format: <port> <remote_address> <remote_port>.

The three field format behaves identically to the two field version, with the exception that the destination port can be different than the source port.

Port, remote address, and remote port example

8080 192.168.60.252 80
8443 web.example.com 443

8080 192.168.60.252 80
8443 web.example.com 443

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26.12.3. Deploying an egress router pod in DNS proxy mode

In DNS proxy mode, an egress router pod acts as a DNS proxy for TCP-based services from its own IP address to one or more destination IP addresses.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create an egress router pod.

Create a service for the egress router pod:

Create a file named egress-router-service.yaml that contains the following YAML. Set spec.ports to the list of ports that you defined previously for the EGRESS_DNS_PROXY_DESTINATION environment variable.

apiVersion: v1
kind: Service
metadata:
  name: egress-dns-svc
spec:
  ports:
    ...
  type: ClusterIP
  selector:
    name: egress-dns-proxy

apiVersion: v1
kind: Service
metadata:
  name: egress-dns-svc
spec:
  ports:
    ...
  type: ClusterIP
  selector:
    name: egress-dns-proxy

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For example:

apiVersion: v1
kind: Service
metadata:
  name: egress-dns-svc
spec:
  ports:
  - name: con1
    protocol: TCP
    port: 80
    targetPort: 80
  - name: con2
    protocol: TCP
    port: 100
    targetPort: 100
  type: ClusterIP
  selector:
    name: egress-dns-proxy

apiVersion: v1
kind: Service
metadata:
  name: egress-dns-svc
spec:
  ports:
  - name: con1
    protocol: TCP
    port: 80
    targetPort: 80
  - name: con2
    protocol: TCP
    port: 100
    targetPort: 100
  type: ClusterIP
  selector:
    name: egress-dns-proxy

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To create the service, enter the following command:
```
oc create -f egress-router-service.yaml
```
```
$ oc create -f egress-router-service.yaml
```
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Pods can now connect to this service. The connections are proxied to the corresponding ports on the external server, using the reserved egress IP address.

26.13. Configuring an egress router pod destination list from a config map

As a cluster administrator, you can define a ConfigMap object that specifies destination mappings for an egress router pod. The specific format of the configuration depends on the type of egress router pod. For details on the format, refer to the documentation for the specific egress router pod.

26.13.1. Configuring an egress router destination mappings with a config map

For a large or frequently-changing set of destination mappings, you can use a config map to externally maintain the list. An advantage of this approach is that permission to edit the config map can be delegated to users without cluster-admin privileges. Because the egress router pod requires a privileged container, it is not possible for users without cluster-admin privileges to edit the pod definition directly.

Note

The egress router pod does not automatically update when the config map changes. You must restart the egress router pod to get updates.

Prerequisites

Install the OpenShift CLI (oc).
Log in as a user with cluster-admin privileges.

Procedure

Create a file containing the mapping data for the egress router pod, as in the following example:

Egress routes for Project "Test", version 3
Fallback

# Egress routes for Project "Test", version 3

80   tcp 203.0.113.25

8080 tcp 203.0.113.26 80
8443 tcp 203.0.113.26 443

# Fallback
203.0.113.27

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You can put blank lines and comments into this file.

Create a ConfigMap object from the file:

oc delete configmap egress-routes --ignore-not-found

$ oc delete configmap egress-routes --ignore-not-found

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oc create configmap egress-routes \
  --from-file=destination=my-egress-destination.txt

$ oc create configmap egress-routes \
  --from-file=destination=my-egress-destination.txt

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In the previous command, the egress-routes value is the name of the ConfigMap object to create and my-egress-destination.txt is the name of the file that the data is read from.

Tip

You can alternatively apply the following YAML to create the config map:

apiVersion: v1
kind: ConfigMap
metadata:
  name: egress-routes
data:
  destination: |
    # Egress routes for Project "Test", version 3

    80   tcp 203.0.113.25

    8080 tcp 203.0.113.26 80
    8443 tcp 203.0.113.26 443

    # Fallback
    203.0.113.27

apiVersion: v1
kind: ConfigMap
metadata:
  name: egress-routes
data:
  destination: |
    # Egress routes for Project "Test", version 3

    80   tcp 203.0.113.25

    8080 tcp 203.0.113.26 80
    8443 tcp 203.0.113.26 443

    # Fallback
    203.0.113.27

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Create an egress router pod definition and specify the configMapKeyRef stanza for the EGRESS_DESTINATION field in the environment stanza:

...
env:
- name: EGRESS_DESTINATION
  valueFrom:
    configMapKeyRef:
      name: egress-routes
      key: destination
...

...
env:
- name: EGRESS_DESTINATION
  valueFrom:
    configMapKeyRef:
      name: egress-routes
      key: destination
...

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26.14. Enabling multicast for a project

26.14.1. About multicast

With IP multicast, data is broadcast to many IP addresses simultaneously.

Important

At this time, multicast is best used for low-bandwidth coordination or service discovery and not a high-bandwidth solution.
By default, network policies affect all connections in a namespace. However, multicast is unaffected by network policies. If multicast is enabled in the same namespace as your network policies, it is always allowed, even if there is a deny-all network policy. Cluster administrators should consider the implications to the exemption of multicast from network policies before enabling it.

Multicast traffic between OpenShift Container Platform pods is disabled by default. If you are using the OpenShift SDN network plugin, you can enable multicast on a per-project basis.

When using the OpenShift SDN network plugin in networkpolicy isolation mode:

Multicast packets sent by a pod will be delivered to all other pods in the project, regardless of NetworkPolicy objects. Pods might be able to communicate over multicast even when they cannot communicate over unicast.
Multicast packets sent by a pod in one project will never be delivered to pods in any other project, even if there are NetworkPolicy objects that allow communication between the projects.

When using the OpenShift SDN network plugin in multitenant isolation mode:

Multicast packets sent by a pod will be delivered to all other pods in the project.
Multicast packets sent by a pod in one project will be delivered to pods in other projects only if each project is joined together and multicast is enabled in each joined project.

26.14.2. Enabling multicast between pods

You can enable multicast between pods for your project.

Prerequisites

Install the OpenShift CLI (oc).
You must log in to the cluster with a user that has the cluster-admin role.

Procedure

Run the following command to enable multicast for a project. Replace <namespace> with the namespace for the project you want to enable multicast for.

oc annotate netnamespace <namespace> \
    netnamespace.network.openshift.io/multicast-enabled=true

$ oc annotate netnamespace <namespace> \
    netnamespace.network.openshift.io/multicast-enabled=true

Copy to Clipboard

Verification

To verify that multicast is enabled for a project, complete the following procedure:

Change your current project to the project that you enabled multicast for. Replace <project> with the project name.
```
oc project <project>
```
```
$ oc project <project>
```
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Create a pod to act as a multicast receiver:

cat <<EOF| oc create -f -
apiVersion: v1
kind: Pod
metadata:
  name: mlistener
  labels:
    app: multicast-verify
spec:
  containers:
    - name: mlistener
      image: registry.access.redhat.com/ubi9
      command: ["/bin/sh", "-c"]
      args:
        ["dnf -y install socat hostname && sleep inf"]
      ports:
        - containerPort: 30102
          name: mlistener
          protocol: UDP
EOF

$ cat <<EOF| oc create -f -
apiVersion: v1
kind: Pod
metadata:
  name: mlistener
  labels:
    app: multicast-verify
spec:
  containers:
    - name: mlistener
      image: registry.access.redhat.com/ubi9
      command: ["/bin/sh", "-c"]
      args:
        ["dnf -y install socat hostname && sleep inf"]
      ports:
        - containerPort: 30102
          name: mlistener
          protocol: UDP
EOF

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Create a pod to act as a multicast sender:

cat <<EOF| oc create -f -
apiVersion: v1
kind: Pod
metadata:
  name: msender
  labels:
    app: multicast-verify
spec:
  containers:
    - name: msender
      image: registry.access.redhat.com/ubi9
      command: ["/bin/sh", "-c"]
      args:
        ["dnf -y install socat && sleep inf"]
EOF

$ cat <<EOF| oc create -f -
apiVersion: v1
kind: Pod
metadata:
  name: msender
  labels:
    app: multicast-verify
spec:
  containers:
    - name: msender
      image: registry.access.redhat.com/ubi9
      command: ["/bin/sh", "-c"]
      args:
        ["dnf -y install socat && sleep inf"]
EOF

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In a new terminal window or tab, start the multicast listener.

Get the IP address for the Pod:

POD_IP=$(oc get pods mlistener -o jsonpath='{.status.podIP}')

$ POD_IP=$(oc get pods mlistener -o jsonpath='{.status.podIP}')

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Start the multicast listener by entering the following command:

oc exec mlistener -i -t -- \
    socat UDP4-RECVFROM:30102,ip-add-membership=224.1.0.1:$POD_IP,fork EXEC:hostname

$ oc exec mlistener -i -t -- \
    socat UDP4-RECVFROM:30102,ip-add-membership=224.1.0.1:$POD_IP,fork EXEC:hostname

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Start the multicast transmitter.

Get the pod network IP address range:

CIDR=$(oc get Network.config.openshift.io cluster \
    -o jsonpath='{.status.clusterNetwork[0].cidr}')

$ CIDR=$(oc get Network.config.openshift.io cluster \
    -o jsonpath='{.status.clusterNetwork[0].cidr}')

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To send a multicast message, enter the following command:

oc exec msender -i -t -- \
    /bin/bash -c "echo | socat STDIO UDP4-DATAGRAM:224.1.0.1:30102,range=$CIDR,ip-multicast-ttl=64"

$ oc exec msender -i -t -- \
    /bin/bash -c "echo | socat STDIO UDP4-DATAGRAM:224.1.0.1:30102,range=$CIDR,ip-multicast-ttl=64"

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If multicast is working, the previous command returns the following output:

mlistener

mlistener

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26.15. Disabling multicast for a project

26.15.1. Disabling multicast between pods

You can disable multicast between pods for your project.

Prerequisites

Install the OpenShift CLI (oc).
You must log in to the cluster with a user that has the cluster-admin role.

Procedure

Disable multicast by running the following command:

oc annotate netnamespace <namespace> \
    netnamespace.network.openshift.io/multicast-enabled-

$ oc annotate netnamespace <namespace> \

1


    netnamespace.network.openshift.io/multicast-enabled-

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1: The namespace for the project you want to disable multicast for.

26.16. Configuring network isolation using OpenShift SDN

When your cluster is configured to use the multitenant isolation mode for the OpenShift SDN network plugin, each project is isolated by default. Network traffic is not allowed between pods or services in different projects in multitenant isolation mode.

You can change the behavior of multitenant isolation for a project in two ways:

You can join one or more projects, allowing network traffic between pods and services in different projects.
You can disable network isolation for a project. It will be globally accessible, accepting network traffic from pods and services in all other projects. A globally accessible project can access pods and services in all other projects.

26.16.1. Prerequisites

You must have a cluster configured to use the OpenShift SDN network plugin in multitenant isolation mode.

26.16.2. Joining projects

You can join two or more projects to allow network traffic between pods and services in different projects.

Prerequisites

Install the OpenShift CLI (oc).
You must log in to the cluster with a user that has the cluster-admin role.

Procedure

Use the following command to join projects to an existing project network:
```
oc adm pod-network join-projects --to=<project1> <project2> <project3>
```
```
$ oc adm pod-network join-projects --to=<project1> <project2> <project3>
```
Copy to Clipboard
Alternatively, instead of specifying specific project names, you can use the --selector=<project_selector> option to specify projects based upon an associated label.
Optional: Run the following command to view the pod networks that you have joined together:
```
oc get netnamespaces
```
```
$ oc get netnamespaces
```
Copy to Clipboard
Projects in the same pod-network have the same network ID in the NETID column.

26.16.3. Isolating a project

You can isolate a project so that pods and services in other projects cannot access its pods and services.

Prerequisites

Install the OpenShift CLI (oc).
You must log in to the cluster with a user that has the cluster-admin role.

Procedure

To isolate the projects in the cluster, run the following command:
```
oc adm pod-network isolate-projects <project1> <project2>
```
```
$ oc adm pod-network isolate-projects <project1> <project2>
```
Copy to Clipboard
Alternatively, instead of specifying specific project names, you can use the --selector=<project_selector> option to specify projects based upon an associated label.

26.16.4. Disabling network isolation for a project

You can disable network isolation for a project.

Prerequisites

Install the OpenShift CLI (oc).
You must log in to the cluster with a user that has the cluster-admin role.

Procedure

Run the following command for the project:
```
oc adm pod-network make-projects-global <project1> <project2>
```
```
$ oc adm pod-network make-projects-global <project1> <project2>
```
Copy to Clipboard
Alternatively, instead of specifying specific project names, you can use the --selector=<project_selector> option to specify projects based upon an associated label.

26.17. Configuring kube-proxy

The Kubernetes network proxy (kube-proxy) runs on each node and is managed by the Cluster Network Operator (CNO). kube-proxy maintains network rules for forwarding connections for endpoints associated with services.

26.17.1. About iptables rules synchronization

The synchronization period determines how frequently the Kubernetes network proxy (kube-proxy) syncs the iptables rules on a node.

A sync begins when either of the following events occurs:

An event occurs, such as service or endpoint is added to or removed from the cluster.
The time since the last sync exceeds the sync period defined for kube-proxy.

26.17.2. kube-proxy configuration parameters

You can modify the following kubeProxyConfig parameters.

Note

Because of performance improvements introduced in OpenShift Container Platform 4.3 and greater, adjusting the iptablesSyncPeriod parameter is no longer necessary.

Table 26.3. Parameters
Parameter	Description	Values	Default
`iptablesSyncPeriod`	The refresh period for `iptables` rules.	A time interval, such as `30s` or `2m`. Valid suffixes include `s`, `m`, and `h` and are described in the Go time package documentation.	`30s`
`proxyArguments.iptables-min-sync-period`	The minimum duration before refreshing `iptables` rules. This parameter ensures that the refresh does not happen too frequently. By default, a refresh starts as soon as a change that affects `iptables` rules occurs.	A time interval, such as `30s` or `2m`. Valid suffixes include `s`, `m`, and `h` and are described in the Go time package	`0s`

26.17.3. Modifying the kube-proxy configuration

You can modify the Kubernetes network proxy configuration for your cluster.

Prerequisites

Install the OpenShift CLI (oc).
Log in to a running cluster with the cluster-admin role.

Procedure

Edit the Network.operator.openshift.io custom resource (CR) by running the following command:
```
oc edit network.operator.openshift.io cluster
```
```
$ oc edit network.operator.openshift.io cluster
```
Copy to Clipboard

Modify the kubeProxyConfig parameter in the CR with your changes to the kube-proxy configuration, such as in the following example CR:

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  kubeProxyConfig:
    iptablesSyncPeriod: 30s
    proxyArguments:
      iptables-min-sync-period: ["30s"]

apiVersion: operator.openshift.io/v1
kind: Network
metadata:
  name: cluster
spec:
  kubeProxyConfig:
    iptablesSyncPeriod: 30s
    proxyArguments:
      iptables-min-sync-period: ["30s"]

Copy to Clipboard

Save the file and exit the text editor.
The syntax is validated by the oc command when you save the file and exit the editor. If your modifications contain a syntax error, the editor opens the file and displays an error message.

Enter the following command to confirm the configuration update:

oc get networks.operator.openshift.io -o yaml

$ oc get networks.operator.openshift.io -o yaml

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Example output

apiVersion: v1
items:
- apiVersion: operator.openshift.io/v1
  kind: Network
  metadata:
    name: cluster
  spec:
    clusterNetwork:
    - cidr: 10.128.0.0/14
      hostPrefix: 23
    defaultNetwork:
      type: OpenShiftSDN
    kubeProxyConfig:
      iptablesSyncPeriod: 30s
      proxyArguments:
        iptables-min-sync-period:
        - 30s
    serviceNetwork:
    - 172.30.0.0/16
  status: {}
kind: List

apiVersion: v1
items:
- apiVersion: operator.openshift.io/v1
  kind: Network
  metadata:
    name: cluster
  spec:
    clusterNetwork:
    - cidr: 10.128.0.0/14
      hostPrefix: 23
    defaultNetwork:
      type: OpenShiftSDN
    kubeProxyConfig:
      iptablesSyncPeriod: 30s
      proxyArguments:
        iptables-min-sync-period:
        - 30s
    serviceNetwork:
    - 172.30.0.0/16
  status: {}
kind: List

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Optional: Enter the following command to confirm that the Cluster Network Operator accepted the configuration change:

oc get clusteroperator network

$ oc get clusteroperator network

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Example output

NAME      VERSION     AVAILABLE   PROGRESSING   DEGRADED   SINCE
network   4.1.0-0.9   True        False         False      1m

NAME      VERSION     AVAILABLE   PROGRESSING   DEGRADED   SINCE
network   4.1.0-0.9   True        False         False      1m

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The AVAILABLE field is True when the configuration update is applied successfully.

Chapter 27. Configuring Routes

27.1. Route configuration

27.1.1. Creating an HTTP-based route

A route allows you to host your application at a public URL. It can either be secure or unsecured, depending on the network security configuration of your application. An HTTP-based route is an unsecured route that uses the basic HTTP routing protocol and exposes a service on an unsecured application port.

The following procedure describes how to create a simple HTTP-based route to a web application, using the hello-openshift application as an example.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in as an administrator.
You have a web application that exposes a port and a TCP endpoint listening for traffic on the port.

Procedure

Create a project called hello-openshift by running the following command:
```
oc new-project hello-openshift
```
```
$ oc new-project hello-openshift
```
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Create a pod in the project by running the following command:

oc create -f https://raw.githubusercontent.com/openshift/origin/master/examples/hello-openshift/hello-pod.json

$ oc create -f https://raw.githubusercontent.com/openshift/origin/master/examples/hello-openshift/hello-pod.json

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Create a service called hello-openshift by running the following command:
```
oc expose pod/hello-openshift
```
```
$ oc expose pod/hello-openshift
```
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Create an unsecured route to the hello-openshift application by running the following command:
```
oc expose svc hello-openshift
```
```
$ oc expose svc hello-openshift
```
Copy to Clipboard

Verification

To verify that the route resource that you created, run the following command:
```
oc get routes -o yaml <name of resource>
```
```
$ oc get routes -o yaml <name of resource> 
```
1
Copy to Clipboard
1
In this example, the route is named hello-openshift.

Sample YAML definition of the created unsecured route:

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: hello-openshift
spec:
  host: www.example.com 
  port:
    targetPort: 8080 
  to:
    kind: Service
    name: hello-openshift

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: hello-openshift
spec:
  host: www.example.com

1


  port:
    targetPort: 8080

2


  to:
    kind: Service
    name: hello-openshift

Copy to Clipboard

The host field is an alias DNS record that points to the service. This field can be any valid DNS name, such as www.example.com. The DNS name must follow DNS952 subdomain conventions. If not specified, a route name is automatically generated.

The targetPort field is the target port on pods that is selected by the service that this route points to.

Note

To display your default ingress domain, run the following command:

oc get ingresses.config/cluster -o jsonpath={.spec.domain}

$ oc get ingresses.config/cluster -o jsonpath={.spec.domain}

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27.1.2. Creating a route for Ingress Controller sharding

A route allows you to host your application at a URL. In this case, the hostname is not set and the route uses a subdomain instead. When you specify a subdomain, you automatically use the domain of the Ingress Controller that exposes the route. For situations where a route is exposed by multiple Ingress Controllers, the route is hosted at multiple URLs.

The following procedure describes how to create a route for Ingress Controller sharding, using the hello-openshift application as an example.

Ingress Controller sharding is useful when balancing incoming traffic load among a set of Ingress Controllers and when isolating traffic to a specific Ingress Controller. For example, company A goes to one Ingress Controller and company B to another.

Prerequisites

You installed the OpenShift CLI (oc).
You are logged in as a project administrator.
You have a web application that exposes a port and an HTTP or TLS endpoint listening for traffic on the port.
You have configured the Ingress Controller for sharding.

Procedure

Create a project called hello-openshift by running the following command:
```
oc new-project hello-openshift
```
```
$ oc new-project hello-openshift
```
Copy to Clipboard

Create a pod in the project by running the following command:

oc create -f https://raw.githubusercontent.com/openshift/origin/master/examples/hello-openshift/hello-pod.json

$ oc create -f https://raw.githubusercontent.com/openshift/origin/master/examples/hello-openshift/hello-pod.json

Copy to Clipboard

Create a service called hello-openshift by running the following command:
```
oc expose pod/hello-openshift
```
```
$ oc expose pod/hello-openshift
```
Copy to Clipboard
Create a route definition called hello-openshift-route.yaml:
YAML definition of the created route for sharding:
```
apiVersion: route.openshift.io/v1
kind: Route
metadata:
  labels:
    type: sharded 
  name: hello-openshift-edge
  namespace: hello-openshift
spec:
  subdomain: hello-openshift 
  tls:
    termination: edge
  to:
    kind: Service
    name: hello-openshift
```
```
apiVersion: route.openshift.io/v1
kind: Route
metadata:
  labels:
    type: sharded 
```
1
```
  name: hello-openshift-edge
  namespace: hello-openshift
spec:
  subdomain: hello-openshift 
```
2
```
  tls:
    termination: edge
  to:
    kind: Service
    name: hello-openshift
```
Copy to Clipboard
1
Both the label key and its corresponding label value must match the ones specified in the Ingress Controller. In this example, the Ingress Controller has the label key and value type: sharded.
2
The route will be exposed using the value of the subdomain field. When you specify the subdomain field, you must leave the hostname unset. If you specify both the host and subdomain fields, then the route will use the value of the host field, and ignore the subdomain field.
Use hello-openshift-route.yaml to create a route to the hello-openshift application by running the following command:
```
oc -n hello-openshift create -f hello-openshift-route.yaml
```
```
$ oc -n hello-openshift create -f hello-openshift-route.yaml
```
Copy to Clipboard

Verification

Get the status of the route with the following command:

oc -n hello-openshift get routes/hello-openshift-edge -o yaml

$ oc -n hello-openshift get routes/hello-openshift-edge -o yaml

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The resulting Route resource should look similar to the following:

Example output

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  labels:
    type: sharded
  name: hello-openshift-edge
  namespace: hello-openshift
spec:
  subdomain: hello-openshift
  tls:
    termination: edge
  to:
    kind: Service
    name: hello-openshift
status:
  ingress:
  - host: hello-openshift.<apps-sharded.basedomain.example.net> 
    routerCanonicalHostname: router-sharded.<apps-sharded.basedomain.example.net> 
    routerName: sharded

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  labels:
    type: sharded
  name: hello-openshift-edge
  namespace: hello-openshift
spec:
  subdomain: hello-openshift
  tls:
    termination: edge
  to:
    kind: Service
    name: hello-openshift
status:
  ingress:
  - host: hello-openshift.<apps-sharded.basedomain.example.net>

1


    routerCanonicalHostname: router-sharded.<apps-sharded.basedomain.example.net>

2


    routerName: sharded

3

Copy to Clipboard

1: The hostname the Ingress Controller, or router, uses to expose the route. The value of the host field is automatically determined by the Ingress Controller, and uses its domain. In this example, the domain of the Ingress Controller is <apps-sharded.basedomain.example.net>.
2: The hostname of the Ingress Controller.
3: The name of the Ingress Controller. In this example, the Ingress Controller has the name sharded.

27.1.3. Configuring route timeouts

You can configure the default timeouts for an existing route when you have services in need of a low timeout, which is required for Service Level Availability (SLA) purposes, or a high timeout, for cases with a slow back end.

Important

If you configured a user-managed external load balancer in front of your OpenShift Container Platform cluster, ensure that the timeout value for the user-managed external load balancer is higher than the timeout value for the route. This configuration prevents network congestion issues over the network that your cluster uses.

Prerequisites

You need a deployed Ingress Controller on a running cluster.

Procedure

Using the oc annotate command, add the timeout to the route:

oc annotate route <route_name> \
    --overwrite haproxy.router.openshift.io/timeout=<timeout><time_unit>

$ oc annotate route <route_name> \
    --overwrite haproxy.router.openshift.io/timeout=<timeout><time_unit>

1

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1: Supported time units are microseconds (us), milliseconds (ms), seconds (s), minutes (m), hours (h), or days (d).

The following example sets a timeout of two seconds on a route named myroute:

oc annotate route myroute --overwrite haproxy.router.openshift.io/timeout=2s

$ oc annotate route myroute --overwrite haproxy.router.openshift.io/timeout=2s

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27.1.4. HTTP Strict Transport Security

HTTP Strict Transport Security (HSTS) policy is a security enhancement, which signals to the browser client that only HTTPS traffic is allowed on the route host. HSTS also optimizes web traffic by signaling HTTPS transport is required, without using HTTP redirects. HSTS is useful for speeding up interactions with websites.

When HSTS policy is enforced, HSTS adds a Strict Transport Security header to HTTP and HTTPS responses from the site. You can use the insecureEdgeTerminationPolicy value in a route to redirect HTTP to HTTPS. When HSTS is enforced, the client changes all requests from the HTTP URL to HTTPS before the request is sent, eliminating the need for a redirect.

Cluster administrators can configure HSTS to do the following:

Enable HSTS per-route
Disable HSTS per-route
Enforce HSTS per-domain, for a set of domains, or use namespace labels in combination with domains

Important

HSTS works only with secure routes, either edge-terminated or re-encrypt. The configuration is ineffective on HTTP or passthrough routes.

27.1.4.1. Enabling HTTP Strict Transport Security per-route

HTTP strict transport security (HSTS) is implemented in the HAProxy template and applied to edge and re-encrypt routes that have the haproxy.router.openshift.io/hsts_header annotation.

Prerequisites

You are logged in to the cluster with a user with administrator privileges for the project.
You installed the oc CLI.

Procedure

To enable HSTS on a route, add the haproxy.router.openshift.io/hsts_header value to the edge-terminated or re-encrypt route. You can use the oc annotate tool to do this by running the following command:
```
oc annotate route <route_name> -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000;\
includeSubDomains;preload"
```
```
$ oc annotate route <route_name> -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000;\ 
```
1
```
includeSubDomains;preload"
```
Copy to Clipboard
1
In this example, the maximum age is set to 31536000 ms, which is approximately eight and a half hours.
Note
In this example, the equal sign (=) is in quotes. This is required to properly execute the annotate command.
Example route configured with an annotation
```
apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/hsts_header: max-age=31536000;includeSubDomains;preload   
...
spec:
  host: def.abc.com
  tls:
    termination: "reencrypt"
    ...
  wildcardPolicy: "Subdomain"
```
```
apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/hsts_header: max-age=31536000;includeSubDomains;preload 
```
1
```
 
```
2
```
 
```
3
```
...
spec:
  host: def.abc.com
  tls:
    termination: "reencrypt"
    ...
  wildcardPolicy: "Subdomain"
```
Copy to Clipboard
1
Required. max-age measures the length of time, in seconds, that the HSTS policy is in effect. If set to 0, it negates the policy.
2
Optional. When included, includeSubDomains tells the client that all subdomains of the host must have the same HSTS policy as the host.
3
Optional. When max-age is greater than 0, you can add preload in haproxy.router.openshift.io/hsts_header to allow external services to include this site in their HSTS preload lists. For example, sites such as Google can construct a list of sites that have preload set. Browsers can then use these lists to determine which sites they can communicate with over HTTPS, even before they have interacted with the site. Without preload set, browsers must have interacted with the site over HTTPS, at least once, to get the header.

27.1.4.2. Disabling HTTP Strict Transport Security per-route

To disable HTTP strict transport security (HSTS) per-route, you can set the max-age value in the route annotation to 0.

Prerequisites

You are logged in to the cluster with a user with administrator privileges for the project.
You installed the oc CLI.

Procedure

To disable HSTS, set the max-age value in the route annotation to 0, by entering the following command:

oc annotate route <route_name> -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=0"

$ oc annotate route <route_name> -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=0"

Copy to Clipboard

Tip

You can alternatively apply the following YAML to create the config map:

Example of disabling HSTS per-route

metadata:
  annotations:
    haproxy.router.openshift.io/hsts_header: max-age=0

metadata:
  annotations:
    haproxy.router.openshift.io/hsts_header: max-age=0

Copy to Clipboard

To disable HSTS for every route in a namespace, enter the following command:

oc annotate route --all -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=0"

$ oc annotate route --all -n <namespace> --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=0"

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Verification

To query the annotation for all routes, enter the following command:

oc get route  --all-namespaces -o go-template='{{range .items}}{{if .metadata.annotations}}{{$a := index .metadata.annotations "haproxy.router.openshift.io/hsts_header"}}{{$n := .metadata.name}}{{with $a}}Name: {{$n}} HSTS: {{$a}}{{"\n"}}{{else}}{{""}}{{end}}{{end}}{{end}}'

$ oc get route  --all-namespaces -o go-template='{{range .items}}{{if .metadata.annotations}}{{$a := index .metadata.annotations "haproxy.router.openshift.io/hsts_header"}}{{$n := .metadata.name}}{{with $a}}Name: {{$n}} HSTS: {{$a}}{{"\n"}}{{else}}{{""}}{{end}}{{end}}{{end}}'

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Example output

Name: routename HSTS: max-age=0

Name: routename HSTS: max-age=0

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27.1.4.3. Enforcing HTTP Strict Transport Security per-domain

To enforce HTTP Strict Transport Security (HSTS) per-domain for secure routes, add a requiredHSTSPolicies record to the Ingress spec to capture the configuration of the HSTS policy.

If you configure a requiredHSTSPolicy to enforce HSTS, then any newly created route must be configured with a compliant HSTS policy annotation.

Note

To handle upgraded clusters with non-compliant HSTS routes, you can update the manifests at the source and apply the updates.

Note

You cannot use oc expose route or oc create route commands to add a route in a domain that enforces HSTS, because the API for these commands does not accept annotations.

Important

HSTS cannot be applied to insecure, or non-TLS routes, even if HSTS is requested for all routes globally.

Prerequisites

You are logged in to the cluster with a user with administrator privileges for the project.
You installed the oc CLI.

Procedure

Edit the Ingress config file:
```
oc edit ingresses.config.openshift.io/cluster
```
```
$ oc edit ingresses.config.openshift.io/cluster
```
Copy to Clipboard
Example HSTS policy
```
apiVersion: config.openshift.io/v1
kind: Ingress
metadata:
  name: cluster
spec:
  domain: 'hello-openshift-default.apps.username.devcluster.openshift.com'
  requiredHSTSPolicies: 
  - domainPatterns: 
    - '*hello-openshift-default.apps.username.devcluster.openshift.com'
    - '*hello-openshift-default2.apps.username.devcluster.openshift.com'
    namespaceSelector: 
      matchLabels:
        myPolicy: strict
    maxAge: 
      smallestMaxAge: 1
      largestMaxAge: 31536000
    preloadPolicy: RequirePreload 
    includeSubDomainsPolicy: RequireIncludeSubDomains 
  - domainPatterns: 
    - 'abc.example.com'
    - '*xyz.example.com'
    namespaceSelector:
      matchLabels: {}
    maxAge: {}
    preloadPolicy: NoOpinion
    includeSubDomainsPolicy: RequireNoIncludeSubDomains
```
```
apiVersion: config.openshift.io/v1
kind: Ingress
metadata:
  name: cluster
spec:
  domain: 'hello-openshift-default.apps.username.devcluster.openshift.com'
  requiredHSTSPolicies: 
```
1
```
  - domainPatterns: 
```
2
```
    - '*hello-openshift-default.apps.username.devcluster.openshift.com'
    - '*hello-openshift-default2.apps.username.devcluster.openshift.com'
    namespaceSelector: 
```
3
```
      matchLabels:
        myPolicy: strict
    maxAge: 
```
4
```
      smallestMaxAge: 1
      largestMaxAge: 31536000
    preloadPolicy: RequirePreload 
```
5
```
    includeSubDomainsPolicy: RequireIncludeSubDomains 
```
6
```
  - domainPatterns: 
```
7
```
    - 'abc.example.com'
    - '*xyz.example.com'
    namespaceSelector:
      matchLabels: {}
    maxAge: {}
    preloadPolicy: NoOpinion
    includeSubDomainsPolicy: RequireNoIncludeSubDomains
```
Copy to Clipboard
1
Required. requiredHSTSPolicies are validated in order, and the first matching domainPatterns applies.
2 7
Required. You must specify at least one domainPatterns hostname. Any number of domains can be listed. You can include multiple sections of enforcing options for different domainPatterns.
3
Optional. If you include namespaceSelector, it must match the labels of the project where the routes reside, to enforce the set HSTS policy on the routes. Routes that only match the namespaceSelector and not the domainPatterns are not validated.
4
Required. max-age measures the length of time, in seconds, that the HSTS policy is in effect. This policy setting allows for a smallest and largest max-age to be enforced.
The largestMaxAge value must be between 0 and 2147483647. It can be left unspecified, which means no upper limit is enforced.
The smallestMaxAge value must be between 0 and 2147483647. Enter 0 to disable HSTS for troubleshooting, otherwise enter 1 if you never want HSTS to be disabled. It can be left unspecified, which means no lower limit is enforced.
5
Optional. Including preload in haproxy.router.openshift.io/hsts_header allows external services to include this site in their HSTS preload lists. Browsers can then use these lists to determine which sites they can communicate with over HTTPS, before they have interacted with the site. Without preload set, browsers need to interact at least once with the site to get the header. preload can be set with one of the following:
RequirePreload: preload is required by the RequiredHSTSPolicy.
RequireNoPreload: preload is forbidden by the RequiredHSTSPolicy.
NoOpinion: preload does not matter to the RequiredHSTSPolicy.
6
Optional. includeSubDomainsPolicy can be set with one of the following:
RequireIncludeSubDomains: includeSubDomains is required by the RequiredHSTSPolicy.
RequireNoIncludeSubDomains: includeSubDomains is forbidden by the RequiredHSTSPolicy.
NoOpinion: includeSubDomains does not matter to the RequiredHSTSPolicy.

You can apply HSTS to all routes in the cluster or in a particular namespace by entering the oc annotate command.

To apply HSTS to all routes in the cluster, enter the oc annotate command. For example:

oc annotate route --all --all-namespaces --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000"

$ oc annotate route --all --all-namespaces --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000"

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To apply HSTS to all routes in a particular namespace, enter the oc annotate command. For example:

oc annotate route --all -n my-namespace --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000"

$ oc annotate route --all -n my-namespace --overwrite=true "haproxy.router.openshift.io/hsts_header"="max-age=31536000"

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Verification

You can review the HSTS policy you configured. For example:

To review the maxAge set for required HSTS policies, enter the following command:

oc get clusteroperator/ingress -n openshift-ingress-operator -o jsonpath='{range .spec.requiredHSTSPolicies[*]}{.spec.requiredHSTSPolicies.maxAgePolicy.largestMaxAge}{"\n"}{end}'

$ oc get clusteroperator/ingress -n openshift-ingress-operator -o jsonpath='{range .spec.requiredHSTSPolicies[*]}{.spec.requiredHSTSPolicies.maxAgePolicy.largestMaxAge}{"\n"}{end}'

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To review the HSTS annotations on all routes, enter the following command:

oc get route  --all-namespaces -o go-template='{{range .items}}{{if .metadata.annotations}}{{$a := index .metadata.annotations "haproxy.router.openshift.io/hsts_header"}}{{$n := .metadata.name}}{{with $a}}Name: {{$n}} HSTS: {{$a}}{{"\n"}}{{else}}{{""}}{{end}}{{end}}{{end}}'

$ oc get route  --all-namespaces -o go-template='{{range .items}}{{if .metadata.annotations}}{{$a := index .metadata.annotations "haproxy.router.openshift.io/hsts_header"}}{{$n := .metadata.name}}{{with $a}}Name: {{$n}} HSTS: {{$a}}{{"\n"}}{{else}}{{""}}{{end}}{{end}}{{end}}'

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Example output

Name: <_routename_> HSTS: max-age=31536000;preload;includeSubDomains

Name: <_routename_> HSTS: max-age=31536000;preload;includeSubDomains

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27.1.5. Throughput issue troubleshooting methods

Sometimes applications deployed by using OpenShift Container Platform can cause network throughput issues, such as unusually high latency between specific services.

If pod logs do not reveal any cause of the problem, use the following methods to analyze performance issues:

Use a packet analyzer, such as ping or tcpdump to analyze traffic between a pod and its node.
For example, run the tcpdump tool on each pod while reproducing the behavior that led to the issue. Review the captures on both sides to compare send and receive timestamps to analyze the latency of traffic to and from a pod. Latency can occur in OpenShift Container Platform if a node interface is overloaded with traffic from other pods, storage devices, or the data plane.
```
tcpdump -s 0 -i any -w /tmp/dump.pcap host <podip 1> && host <podip 2>
```
```
$ tcpdump -s 0 -i any -w /tmp/dump.pcap host <podip 1> && host <podip 2> 
```
1
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1
podip is the IP address for the pod. Run the oc get pod <pod_name> -o wide command to get the IP address of a pod.
The tcpdump command generates a file at /tmp/dump.pcap containing all traffic between these two pods. You can run the analyzer shortly before the issue is reproduced and stop the analyzer shortly after the issue is finished reproducing to minimize the size of the file. You can also run a packet analyzer between the nodes (eliminating the SDN from the equation) with:
```
tcpdump -s 0 -i any -w /tmp/dump.pcap port 4789
```
```
$ tcpdump -s 0 -i any -w /tmp/dump.pcap port 4789
```
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Use a bandwidth measuring tool, such as iperf, to measure streaming throughput and UDP throughput. Locate any bottlenecks by running the tool from the pods first, and then running it from the nodes.
- For information on installing and using iperf, see this Red Hat Solution.
In some cases, the cluster may mark the node with the router pod as unhealthy due to latency issues. Use worker latency profiles to adjust the frequency that the cluster waits for a status update from the node before taking action.
If your cluster has designated lower-latency and higher-latency nodes, configure the spec.nodePlacement field in the Ingress Controller to control the placement of the router pod.

27.1.6. Using cookies to keep route statefulness

OpenShift Container Platform provides sticky sessions, which enables stateful application traffic by ensuring all traffic hits the same endpoint. However, if the endpoint pod terminates, whether through restart, scaling, or a change in configuration, this statefulness can disappear.

OpenShift Container Platform can use cookies to configure session persistence. The Ingress controller selects an endpoint to handle any user requests, and creates a cookie for the session. The cookie is passed back in the response to the request and the user sends the cookie back with the next request in the session. The cookie tells the Ingress Controller which endpoint is handling the session, ensuring that client requests use the cookie so that they are routed to the same pod.

Note

Cookies cannot be set on passthrough routes, because the HTTP traffic cannot be seen. Instead, a number is calculated based on the source IP address, which determines the backend.

If backends change, the traffic can be directed to the wrong server, making it less sticky. If you are using a load balancer, which hides source IP, the same number is set for all connections and traffic is sent to the same pod.

27.1.6.1. Annotating a route with a cookie

You can set a cookie name to overwrite the default, auto-generated one for the route. This allows the application receiving route traffic to know the cookie name. By deleting the cookie it can force the next request to re-choose an endpoint. So, if a server was overloaded it tries to remove the requests from the client and redistribute them.

Procedure

Annotate the route with the specified cookie name:

oc annotate route <route_name> router.openshift.io/cookie_name="<cookie_name>"

$ oc annotate route <route_name> router.openshift.io/cookie_name="<cookie_name>"

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where:

<route_name>: Specifies the name of the route.
<cookie_name>: Specifies the name for the cookie.

For example, to annotate the route my_route with the cookie name my_cookie:

oc annotate route my_route router.openshift.io/cookie_name="my_cookie"

$ oc annotate route my_route router.openshift.io/cookie_name="my_cookie"

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Capture the route hostname in a variable:

ROUTE_NAME=$(oc get route <route_name> -o jsonpath='{.spec.host}')

$ ROUTE_NAME=$(oc get route <route_name> -o jsonpath='{.spec.host}')

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where:

<route_name>: Specifies the name of the route.

Save the cookie, and then access the route:

curl $ROUTE_NAME -k -c /tmp/cookie_jar

$ curl $ROUTE_NAME -k -c /tmp/cookie_jar

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Use the cookie saved by the previous command when connecting to the route:

curl $ROUTE_NAME -k -b /tmp/cookie_jar

$ curl $ROUTE_NAME -k -b /tmp/cookie_jar

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27.1.7. Path-based routes

Path-based routes specify a path component that can be compared against a URL, which requires that the traffic for the route be HTTP based. Thus, multiple routes can be served using the same hostname, each with a different path. Routers should match routes based on the most specific path to the least.

The following table shows example routes and their accessibility:

Table 27.1. Route availability
Route	When Compared to	Accessible
www.example.com/test	www.example.com/test	Yes
www.example.com/test	www.example.com	No
www.example.com/test and www.example.com	www.example.com/test	Yes
www.example.com/test and www.example.com	www.example.com	Yes
www.example.com	www.example.com/text	Yes (Matched by the host, not the route)
www.example.com	www.example.com	Yes

An unsecured route with a path

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: route-unsecured
spec:
  host: www.example.com
  path: "/test" 
  to:
    kind: Service
    name: service-name

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: route-unsecured
spec:
  host: www.example.com
  path: "/test"

1


  to:
    kind: Service
    name: service-name

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1: The path is the only added attribute for a path-based route.

Note

Path-based routing is not available when using passthrough TLS, as the router does not terminate TLS in that case and cannot read the contents of the request.

27.1.8. Route-specific annotations

The Ingress Controller can set the default options for all the routes it exposes. An individual route can override some of these defaults by providing specific configurations in its annotations. Red Hat does not support adding a route annotation to an operator-managed route.

Important

To create a whitelist with multiple source IPs or subnets, use a space-delimited list. Any other delimiter type causes the list to be ignored without a warning or error message.

Table 27.2. Route annotations
Variable	Description	Environment variable used as default
`haproxy.router.openshift.io/balance`	Sets the load-balancing algorithm. Available options are `random`, `source`, `roundrobin`, and `leastconn`. The default value is `source` for TLS passthrough routes. For all other routes, the default is `random`.	`ROUTER_TCP_BALANCE_SCHEME` for passthrough routes. Otherwise, use `ROUTER_LOAD_BALANCE_ALGORITHM`.
`haproxy.router.openshift.io/disable_cookies`	Disables the use of cookies to track related connections. If set to `'true'` or `'TRUE'`, the balance algorithm is used to choose which back-end serves connections for each incoming HTTP request.
`router.openshift.io/cookie_name`	Specifies an optional cookie to use for this route. The name must consist of any combination of upper and lower case letters, digits, "_", and "-". The default is the hashed internal key name for the route.
`haproxy.router.openshift.io/pod-concurrent-connections`	Sets the maximum number of connections that are allowed to a backing pod from a router. Note: If there are multiple pods, each can have this many connections. If you have multiple routers, there is no coordination among them, each may connect this many times. If not set, or set to 0, there is no limit.
`haproxy.router.openshift.io/rate-limit-connections`	Setting `'true'` or `'TRUE'` enables rate limiting functionality which is implemented through stick-tables on the specific backend per route. Note: Using this annotation provides basic protection against denial-of-service attacks.
`haproxy.router.openshift.io/rate-limit-connections.concurrent-tcp`	Limits the number of concurrent TCP connections made through the same source IP address. It accepts a numeric value. Note: Using this annotation provides basic protection against denial-of-service attacks.
`haproxy.router.openshift.io/rate-limit-connections.rate-http`	Limits the rate at which a client with the same source IP address can make HTTP requests. It accepts a numeric value. Note: Using this annotation provides basic protection against denial-of-service attacks.
`haproxy.router.openshift.io/rate-limit-connections.rate-tcp`	Limits the rate at which a client with the same source IP address can make TCP connections. It accepts a numeric value. Note: Using this annotation provides basic protection against denial-of-service attacks.
`haproxy.router.openshift.io/timeout`	Sets a server-side timeout for the route. (TimeUnits)	`ROUTER_DEFAULT_SERVER_TIMEOUT`
`haproxy.router.openshift.io/timeout-tunnel`	This timeout applies to a tunnel connection, for example, WebSocket over cleartext, edge, reencrypt, or passthrough routes. With cleartext, edge, or reencrypt route types, this annotation is applied as a timeout tunnel with the existing timeout value. For the passthrough route types, the annotation takes precedence over any existing timeout value set.	`ROUTER_DEFAULT_TUNNEL_TIMEOUT`
`ingresses.config/cluster ingress.operator.openshift.io/hard-stop-after`	You can set either an IngressController or the ingress config . This annotation redeploys the router and configures the HA proxy to emit the haproxy `hard-stop-after` global option, which defines the maximum time allowed to perform a clean soft-stop.	`ROUTER_HARD_STOP_AFTER`
`router.openshift.io/haproxy.health.check.interval`	Sets the interval for the back-end health checks. (TimeUnits)	`ROUTER_BACKEND_CHECK_INTERVAL`
`haproxy.router.openshift.io/ip_whitelist`	Sets an allowlist for the route. The allowlist is a space-separated list of IP addresses and CIDR ranges for the approved source addresses. Requests from IP addresses that are not in the allowlist are dropped. The maximum number of IP addresses and CIDR ranges directly visible in the `haproxy.config` file is 61. [¹]
`haproxy.router.openshift.io/hsts_header`	Sets a Strict-Transport-Security header for the edge terminated or re-encrypt route.
`haproxy.router.openshift.io/rewrite-target`	Sets the rewrite path of the request on the backend.
`router.openshift.io/cookie-same-site`	Sets a value to restrict cookies. The values are: `Lax`: the browser does not send cookies on cross-site requests, but does send cookies when users navigate to the origin site from an external site. This is the default browser behavior when the `SameSite` value is not specified. `Strict`: the browser sends cookies only for same-site requests. `None`: the browser sends cookies for both cross-site and same-site requests. This value is applicable to re-encrypt and edge routes only. For more information, see the SameSite cookies documentation.
`haproxy.router.openshift.io/set-forwarded-headers`	Sets the policy for handling the `Forwarded` and `X-Forwarded-For` HTTP headers per route. The values are: `append`: appends the header, preserving any existing header. This is the default value. `replace`: sets the header, removing any existing header. `never`: never sets the header, but preserves any existing header. `if-none`: sets the header if it is not already set.	`ROUTER_SET_FORWARDED_HEADERS`

If the number of IP addresses and CIDR ranges in an allowlist exceeds 61, they are written into a separate file that is then referenced from haproxy.config. This file is stored in the var/lib/haproxy/router/whitelists folder.
Note
To ensure that the addresses are written to the allowlist, check that the full list of CIDR ranges are listed in the Ingress Controller configuration file. The etcd object size limit restricts how large a route annotation can be. Because of this, it creates a threshold for the maximum number of IP addresses and CIDR ranges that you can include in an allowlist.

Note

Environment variables cannot be edited.

Router timeout variables

TimeUnits are represented by a number followed by the unit: us *(microseconds), ms (milliseconds, default), s (seconds), m (minutes), h *(hours), d (days).

The regular expression is: [1-9][0-9]*(us\|ms\|s\|m\|h\|d).

Variable	Default	Description
`ROUTER_BACKEND_CHECK_INTERVAL`	`5000ms`	Length of time between subsequent liveness checks on back ends.
`ROUTER_CLIENT_FIN_TIMEOUT`	`1s`	Controls the TCP FIN timeout period for the client connecting to the route. If the FIN sent to close the connection does not answer within the given time, HAProxy closes the connection. This is harmless if set to a low value and uses fewer resources on the router.
`ROUTER_DEFAULT_CLIENT_TIMEOUT`	`30s`	Length of time that a client has to acknowledge or send data.
`ROUTER_DEFAULT_CONNECT_TIMEOUT`	`5s`	The maximum connection time.
`ROUTER_DEFAULT_SERVER_FIN_TIMEOUT`	`1s`	Controls the TCP FIN timeout from the router to the pod backing the route.
`ROUTER_DEFAULT_SERVER_TIMEOUT`	`30s`	Length of time that a server has to acknowledge or send data.
`ROUTER_DEFAULT_TUNNEL_TIMEOUT`	`1h`	Length of time for TCP or WebSocket connections to remain open. This timeout period resets whenever HAProxy reloads.
`ROUTER_SLOWLORIS_HTTP_KEEPALIVE`	`300s`	Set the maximum time to wait for a new HTTP request to appear. If this is set too low, it can cause problems with browsers and applications not expecting a small `keepalive` value. Some effective timeout values can be the sum of certain variables, rather than the specific expected timeout. For example, `ROUTER_SLOWLORIS_HTTP_KEEPALIVE` adjusts `timeout http-keep-alive`. It is set to `300s` by default, but HAProxy also waits on `tcp-request inspect-delay`, which is set to `5s`. In this case, the overall timeout would be `300s` plus `5s`.
`ROUTER_SLOWLORIS_TIMEOUT`	`10s`	Length of time the transmission of an HTTP request can take.
`RELOAD_INTERVAL`	`5s`	Allows the minimum frequency for the router to reload and accept new changes.
`ROUTER_METRICS_HAPROXY_TIMEOUT`	`5s`	Timeout for the gathering of HAProxy metrics.

A route setting custom timeout

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/timeout: 5500ms 
...

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/timeout: 5500ms

1

...

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1: Specifies the new timeout with HAProxy supported units (us, ms, s, m, h, d). If the unit is not provided, ms is the default.

Note

Setting a server-side timeout value for passthrough routes too low can cause WebSocket connections to timeout frequently on that route.

A route that allows only one specific IP address

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 192.168.1.10

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 192.168.1.10

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A route that allows several IP addresses

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 192.168.1.10 192.168.1.11 192.168.1.12

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 192.168.1.10 192.168.1.11 192.168.1.12

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A route that allows an IP address CIDR network

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 192.168.1.0/24

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 192.168.1.0/24

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A route that allows both IP an address and IP address CIDR networks

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 180.5.61.153 192.168.1.0/24 10.0.0.0/8

metadata:
  annotations:
    haproxy.router.openshift.io/ip_whitelist: 180.5.61.153 192.168.1.0/24 10.0.0.0/8

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A route specifying a rewrite target

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/rewrite-target: / 
...

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  annotations:
    haproxy.router.openshift.io/rewrite-target: /

1

...

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1: Sets / as rewrite path of the request on the backend.

Setting the haproxy.router.openshift.io/rewrite-target annotation on a route specifies that the Ingress Controller should rewrite paths in HTTP requests using this route before forwarding the requests to the backend application. The part of the request path that matches the path specified in spec.path is replaced with the rewrite target specified in the annotation.

The following table provides examples of the path rewriting behavior for various combinations of spec.path, request path, and rewrite target.

Table 27.3. rewrite-target examples:
Route.spec.path	Request path	Rewrite target	Forwarded request path
/foo	/foo	/	/
/foo	/foo/	/	/
/foo	/foo/bar	/	/bar
/foo	/foo/bar/	/	/bar/
/foo	/foo	/bar	/bar
/foo	/foo/	/bar	/bar/
/foo	/foo/bar	/baz	/baz/bar
/foo	/foo/bar/	/baz	/baz/bar/
/foo/	/foo	/	N/A (request path does not match route path)
/foo/	/foo/	/	/
/foo/	/foo/bar	/	/bar

27.1.9. Configuring the route admission policy

Administrators and application developers can run applications in multiple namespaces with the same domain name. This is for organizations where multiple teams develop microservices that are exposed on the same hostname.

Warning

Allowing claims across namespaces should only be enabled for clusters with trust between namespaces, otherwise a malicious user could take over a hostname. For this reason, the default admission policy disallows hostname claims across namespaces.

Prerequisites

Cluster administrator privileges.

Procedure

Edit the .spec.routeAdmission field of the ingresscontroller resource variable using the following command:

oc -n openshift-ingress-operator patch ingresscontroller/default --patch '{"spec":{"routeAdmission":{"namespaceOwnership":"InterNamespaceAllowed"}}}' --type=merge

$ oc -n openshift-ingress-operator patch ingresscontroller/default --patch '{"spec":{"routeAdmission":{"namespaceOwnership":"InterNamespaceAllowed"}}}' --type=merge

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Sample Ingress Controller configuration

spec:
  routeAdmission:
    namespaceOwnership: InterNamespaceAllowed
...

spec:
  routeAdmission:
    namespaceOwnership: InterNamespaceAllowed
...

Copy to Clipboard

Tip

You can alternatively apply the following YAML to configure the route admission policy:

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  routeAdmission:
    namespaceOwnership: InterNamespaceAllowed

apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: default
  namespace: openshift-ingress-operator
spec:
  routeAdmission:
    namespaceOwnership: InterNamespaceAllowed

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27.1.10. Creating a route through an Ingress object

Some ecosystem components have an integration with Ingress resources but not with route resources. To cover this case, OpenShift Container Platform automatically creates managed route objects when an Ingress object is created. These route objects are deleted when the corresponding Ingress objects are deleted.

Procedure

Define an Ingress object in the OpenShift Container Platform console or by entering the oc create command:

YAML Definition of an Ingress

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: frontend
  annotations:
    route.openshift.io/termination: "reencrypt" 
    route.openshift.io/destination-ca-certificate-secret: secret-ca-cert 
spec:
  rules:
  - host: www.example.com 
    http:
      paths:
      - backend:
          service:
            name: frontend
            port:
              number: 443
        path: /
        pathType: Prefix
  tls:
  - hosts:
    - www.example.com
    secretName: example-com-tls-certificate

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: frontend
  annotations:
    route.openshift.io/termination: "reencrypt"

1


    route.openshift.io/destination-ca-certificate-secret: secret-ca-cert

2


spec:
  rules:
  - host: www.example.com

3


    http:
      paths:
      - backend:
          service:
            name: frontend
            port:
              number: 443
        path: /
        pathType: Prefix
  tls:
  - hosts:
    - www.example.com
    secretName: example-com-tls-certificate

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The route.openshift.io/termination annotation can be used to configure the spec.tls.termination field of the Route as Ingress has no field for this. The accepted values are edge, passthrough and reencrypt. All other values are silently ignored. When the annotation value is unset, edge is the default route. The TLS certificate details must be defined in the template file to implement the default edge route.

When working with an Ingress object, you must specify an explicit hostname, unlike when working with routes. You can use the <host_name>.<cluster_ingress_domain> syntax, for example apps.openshiftdemos.com, to take advantage of the *.<cluster_ingress_domain> wildcard DNS record and serving certificate for the cluster. Otherwise, you must ensure that there is a DNS record for the chosen hostname.

If you specify the passthrough value in the route.openshift.io/termination annotation, set path to '' and pathType to ImplementationSpecific in the spec:

  spec:
    rules:
    - host: www.example.com
      http:
        paths:
        - path: ''
          pathType: ImplementationSpecific
          backend:
            service:
              name: frontend
              port:
                number: 443

  spec:
    rules:
    - host: www.example.com
      http:
        paths:
        - path: ''
          pathType: ImplementationSpecific
          backend:
            service:
              name: frontend
              port:
                number: 443

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oc apply -f ingress.yaml

$ oc apply -f ingress.yaml

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