Chapter 7. Multiple networks

1. Create the Pod resource definition and add the k8s.v1.cni.cncf.io/networks parameter to the Pod metadata mapping. The k8s.v1.cni.cncf.io/networks accepts a comma separated string of one or more NetworkAttachmentDefinition Custom Resource (CR) names:

   metadata:
     annotations:
       k8s.v1.cni.cncf.io/networks: <network>[,<network>,...] 

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   Replace <network> with the name of the additional network to associate with the Pod. 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.

   In the following example, two additional networks are attached to the Pod:

   apiVersion: v1
   kind: Pod
   metadata:
     name: example-pod
     annotations:
       k8s.v1.cni.cncf.io/networks: net1,net2
   spec:
     containers:
     - name: example-pod
       command: ["/bin/bash", "-c", "sleep 2000000000000"]
       image: centos/tools

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2. Create the Pod by running the following command:

   $ oc create -f pod.yaml

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3. Optional: Confirm that the annotation exists in the Pod CR by running the following command. Replace <name> with the name of the Pod.

   $ 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
   apiVersion: v1
   kind: Pod
   metadata:
     annotations:
       k8s.v1.cni.cncf.io/networks: macvlan-bridge
       k8s.v1.cni.cncf.io/networks-status: |- 

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         [{
             "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:
     ...

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   1

   The k8s.v1.cni.cncf.io/networks-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.

1. Edit the Pod resource definition by running the following command. Replace <name> with the name of the Pod to edit.

   $ oc edit pod <name>

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2. Update the annotations mapping to remove the additional network from the Pod by performing one of the following actions:

   • To remove all additional networks from a Pod, remove the k8s.v1.cni.cncf.io/networks parameter from the Pod resource definition as in the following example:

     apiVersion: v1
     kind: Pod
     metadata:
       name: example-pod
       annotations: {}
     spec:
       containers:
       - name: example-pod
         command: ["/bin/bash", "-c", "sleep 2000000000000"]
         image: centos/tools

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   • To remove a specific additional network from a Pod, update the k8s.v1.cni.cncf.io/networks parameter by removing the name of the NetworkAttachmentDefinition for the additional network.

3. Optional: Confirm that the Pod is no longer attached to the additional network by running the following command. Replace <name> with the name of the Pod.

   $ oc describe pod <name>

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   In the following example, the example-pod Pod is attached only to the default cluster network.

   $ oc describe pod example-pod
   
   Name:               example-pod
   ...
   Annotations:        k8s.v1.cni.cncf.io/networks-status:
                         [{
                             "name": "openshift-sdn",
                             "interface": "eth0",
                             "ips": [
                                 "10.131.0.13"
                             ],
                             "default": true, 

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                             "dns": {}
                         }]
   Status:             Running
   ...

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   Only the default cluster network is attached to the Pod.

1. Edit the CNO CR by running the following command:

   $ oc edit networks.operator.openshift.io cluster

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2. Modify the CR that you are creating by adding the configuration for the additional network you are creating, as in the following example CR.

   The following YAML configures the bridge CNI plug-in:

   apiVersion: operator.openshift.io/v1
   kind: Network
   metadata:
     name: cluster
   spec:
     additionalNetworks: 

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     - name: test-network-1
       namespace: test-1
       type: Raw
       rawCNIConfig: '{
         "cniVersion": "0.3.1",
         "name": "test-network-1",
         "type": "bridge",
         "ipam": {
           "type": "static",
           "addresses": [
             {
               "address": "191.168.1.1/24"
             }
           ]
         }
       }'

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   1

   Specify the configuration for the additional network attachment definition.

3. Save your changes and quit the text editor to commit your changes.

4. Optional: Confirm that the CNO created the NetworkAttachmentDefinition CR by running the following command. There might be a delay before the CNO creates the CR.

   $ oc get network-attachment-definitions -n <namespace>
   NAME                 AGE
   test-network-1       14m

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1. Edit the CNO CR by running the following command:

   $ oc edit networks.operator.openshift.io cluster

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2. Modify the CR that you are creating by adding the configuration for the additional network you are creating, as in the following example CR.

   The following YAML configures the macvlan CNI plug-in:

   apiVersion: operator.openshift.io/v1
   kind: Network
   metadata:
     name: cluster
   spec:
     additionalNetworks: 

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     - name: test-network-1
       namespace: test-1
       type: SimpleMacvlan
       simpleMacvlanConfig:
         ipamConfig:
           type: static
           staticIPAMConfig:
             addresses:
             - address: 10.1.1.0/24

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   1

   Specify the configuration for the additional network attachment definition.

3. Save your changes and quit the text editor to commit your changes.

4. Optional: Confirm that the CNO created the NetworkAttachmentDefinition CR by running the following command. There might be a delay before the CNO creates the CR.

   $ oc get network-attachment-definitions -n <namespace>
   NAME                 AGE
   test-network-1       14m

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1. Edit the CNO CR by running the following command:

   $ oc edit networks.operator.openshift.io cluster

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2. Modify the CR that you are creating by adding the configuration for the additional network you are creating, as in the following example CR.

   The following YAML configures the ipvlan CNI plug-in:

   apiVersion: operator.openshift.io/v1
   kind: Network
   metadata:
     name: cluster
   spec:
     additionalNetworks: 

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     - name: test-network-1
       namespace: test-1
       type: Raw
       rawCNIConfig: '{
         "cniVersion": "0.3.1",
         "name": "test-network-1",
         "type": "ipvlan",
         "master": "eth1",
         "mode": "l2",
         "ipam": {
           "type": "static",
           "addresses": [
             {
               "address": "191.168.1.1/24"
             }
           ]
         }
       }'

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   1

   Specify the configuration for the additional network attachment definition.

3. Save your changes and quit the text editor to commit your changes.

4. Optional: Confirm that the CNO created the NetworkAttachmentDefinition CR by running the following command. There might be a delay before the CNO creates the CR.

   $ oc get network-attachment-definitions -n <namespace>
   NAME                 AGE
   test-network-1       14m

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1. Edit the CNO CR by running the following command:

   $ oc edit networks.operator.openshift.io cluster

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2. Modify the CR that you are creating by adding the configuration for the additional network you are creating, as in the following example CR.

   The following YAML configures the host-device CNI plug-in:

   apiVersion: operator.openshift.io/v1
   kind: Network
   metadata:
     name: cluster
   spec:
     additionalNetworks: 

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     - name: test-network-1
       namespace: test-1
       type: Raw
       rawCNIConfig: '{
         "cniVersion": "0.3.1",
         "name": "test-network-1",
         "type": "host-device",
         "device": "eth1"
       }'

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   1

   Specify the configuration for the additional network attachment definition.

3. Save your changes and quit the text editor to commit your changes.

4. Optional: Confirm that the CNO created the NetworkAttachmentDefinition CR by running the following command. There might be a delay before the CNO creates the CR.

   $ oc get network-attachment-definitions -n <namespace>
   NAME                 AGE
   test-network-1       14m

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Procedure

1. Create the following SriovNetworkNodePolicy CR, and then save the YAML in the <name>-sriov-node-network.yaml file. Replace <name> with the name for this configuration.

   apiVersion: sriovnetwork.openshift.io/v1
   kind: SriovNetworkNodePolicy
   metadata:
     name: <name> 

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     namespace: sriov-network-operator 

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   spec:
     resourceName: <sriov_resource_name> 

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     nodeSelector:
       feature.node.kubernetes.io/network-sriov.capable: "true" 

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     priority: <priority> 

   5

   
     mtu: <mtu> 

   6

   
     numVfs: <num> 

   7

   
     nicSelector: 

   8

   
       vendor: "<vendor_code>" 

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       deviceID: "<device_id>" 

   10

   
       pfNames: ["<pf_name>", ...] 

   11

   
       rootDevices: ["<pci_bus_id>", "..."] 

   12

   
     deviceType: <device_type> 

   13

   
     isRdma: false 

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   1

   Specify a name for the CR.

   2

   Specify the namespace where the SR-IOV Operator is installed.

   3

   Specify the resource name of the SR-IOV device plug-in. The prefix openshift.io/ will be added when it’s referred in Pod spec. You can create multiple SriovNetworkNodePolicy CRs for a resource name.

   4

   Specify the node selector to select which node to be configured. User can choose to label the nodes manually or with tools like Kubernetes Node Feature Discovery. Only SR-IOV network devices on selected nodes will be configured. The SR-IOV CNI plug-in and device plug-in will be only deployed on selected nodes.

   5

   Specify 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.

   6

   Specify a value for the maximum transmission unit (MTU) of the virtual function. The value for MTU must be in the range from 1 to 9000. If you do not need to specify the MTU, specify a value of ''.

   7

   Specify the number of the virtual functions (VF) to create for the SR-IOV physical network device. For an Intel Network Interface Card (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 128.

   8

   The nicSelector mapping selects the Ethernet device for the Operator to configure. You do not need to specify values for all the parameters. It is recommended to identify the Ethernet adapter with enough precision to minimize the possibility of selecting an Ethernet 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 point to an identical device.

   9

   Specify the vendor hex code of the SR-IOV network device. The only allowed values are either 8086 or 15b3.

   10

   Specify the device hex code of SR-IOV network device. The only allowed values are 158b, 1015, 1017.

   11

   The parameter accepts an array of one or more physical function (PF) names for the Ethernet device.

   12

   The parameter accepts an array of one or more PCI bus addresses for the physical function of the Ethernet device. Provide the address in the following format: 0000:02:00.1.

   13

   Specify the driver type for the virtual functions. You can specify one of the following values: netdevice or vfio-pci. The default value is netdevice.

   14

   Specify whether to enable RDMA mode. The default value is false. Only RDMA over Converged Ethernet (RoCE) mode is supported on Mellanox Ethernet adapters.

   Note

   If RDMA flag 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.

2. Create the CR by running the following command:

   $ oc create -f <filename> 

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   Replace <filename> with the name of the file you created in the previous step.

Procedure

1. Create the following SriovNetwork CR, and then save the YAML in the <name>-sriov-network.yaml file. Replace <name> with a name for this additional network.

   apiVersion: sriovnetwork.openshift.io/v1
   kind: SriovNetwork
   metadata:
     name: <name> 

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     namespace: sriov-network-operator 

   2

   
   spec:
     networkNamespace: <target_namespace> 

   3

   
     ipam: |- 

   4

   
       ...
     vlan: <vlan> 

   5

   
     resourceName: <sriov_resource_name> 

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   1

   Replace <name> with a name for the CR. The Operator will create a NetworkAttachmentDefinition CR with same name.

   2

   Specify the namespace where the SR-IOV Operator is installed.

   3

   Replace <target_namespace> with the namespace where the NetworkAttachmentDefinition CR will be created.

   4

   Specify a configuration object for the ipam CNI plug-in as a YAML block scalar. The plug-in manages IP address assignment for the attachment definition.

   5

   Replace <vlan> with a Virtual LAN (VLAN) ID for the additional network. The integer value must be from 0 to 4095. The default value is 0.

   6

   Replace <sriov_resource_name> with the value for the .spec.resourceName parameter from the SriovNetworkNodePolicy CR that defines the SR-IOV hardware for this additional network.

2. Create the CR by running the following command:

   $ oc create -f <filename> 

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   Replace <filename> with the name of the file you created in the previous step.

3. Optional: Confirm that the NetworkAttachmentDefinition CR associated with the SriovNetwork CR that you created in the previous step exists by running the following command. Replace <namespace> with the namespace you specified in the SriovNetwork CR.

   oc get net-attach-def -n <namespace>

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1. Create the Pod resource definition and add the k8s.v1.cni.cncf.io/networks parameter to the Pod metadata mapping. The k8s.v1.cni.cncf.io/networks accepts a comma separated string of one or more NetworkAttachmentDefinition Custom Resource (CR) names:

   metadata:
     annotations:
       k8s.v1.cni.cncf.io/networks: <network>[,<network>,...] 

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   1

   Replace <network> with the name of the additional network to associate with the Pod. 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.

   In the following example, two additional networks are attached to the Pod:

   apiVersion: v1
   kind: Pod
   metadata:
     name: example-pod
     annotations:
       k8s.v1.cni.cncf.io/networks: net1,net2
   spec:
     containers:
     - name: example-pod
       command: ["/bin/bash", "-c", "sleep 2000000000000"]
       image: centos/tools

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2. Create the Pod by running the following command:

   $ oc create -f pod.yaml

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3. Optional: Confirm that the annotation exists in the Pod CR by running the following command. Replace <name> with the name of the Pod.

   $ 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
   apiVersion: v1
   kind: Pod
   metadata:
     annotations:
       k8s.v1.cni.cncf.io/networks: macvlan-bridge
       k8s.v1.cni.cncf.io/networks-status: |- 

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         [{
             "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:
     ...

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   1

   The k8s.v1.cni.cncf.io/networks-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.

1. Run the following command to edit the Cluster Network Operator (CNO) CR in your default text editor:

   $ oc edit networks.operator.openshift.io cluster

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2. In the additionalNetworks collection, update the additional network with your changes.
3. Save your changes and quit the text editor to commit your changes.

4. Optional: Confirm that the CNO updated the NetworkAttachmentDefinition CR 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 CR to reflect your changes.

   $ oc get network-attachment-definitions <network-name> -o yaml

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   For example, the following console output displays a NetworkAttachmentDefinition that is named net1:

   $ 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"]}} }

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1. Edit the Cluster Network Operator (CNO) in your default text editor by running the following command:

   $ oc edit networks.operator.openshift.io cluster

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2. 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: [] 

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   If you are removing the configuration mapping for the only additional network attachment definition in the additionalNetworks collection, you must specify an empty collection.

3. Save your changes and quit the text editor to commit your changes.

4. Delete the NetworkAttachmentDefinition CR for the additional network by running the following command. Replace <name> with the name of the additional network to remove.

   $ oc delete network-attachment-definition <name>

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5. Optional: Confirm that the additional network CR was deleted by running the following command:

   $ oc get network-attachment-definition --all-namespaces

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