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Chapter 6. Deploying OpenShift sandboxed containers on IBM Z and IBM LinuxONE

You can deploy OpenShift sandboxed containers on IBM Z® and IBM® LinuxONE.

OpenShift sandboxed containers deploys peer pods. The peer pod design circumvents the need for nested virtualization. For more information, see peer pod and Peer pods technical deep dive.

Important

OpenShift sandboxed containers on IBM Z® and IBM® LinuxONE 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.

Cluster requirements

  • You have installed Red Hat OpenShift Container Platform 4.14 or later on the cluster where you are installing the OpenShift sandboxed containers Operator.
  • Your cluster has three control plane nodes and at least two worker nodes.
  • Your cluster nodes and peer pods are in the same IBM Z® KVM host logical partition (LPAR).
  • Your cluster nodes and peer pods are connected to the same subnet.

For details on installing OpenShift Container Platform on IBM Z® and IBM® LinuxONE see Installing on IBM Z® and IBM® LinuxONE.

6.1. Peer pod resource requirements
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You must ensure that your cluster has sufficient resources.

Peer pod virtual machines (VMs) require resources in two locations:

  • The worker node. The worker node stores metadata, Kata shim resources (containerd-shim-kata-v2), remote-hypervisor resources (cloud-api-adaptor), and the tunnel setup between the worker nodes and the peer pod VM.
  • The libvirt virtual machine instance. This is the actual peer pod VM running in the LPAR (KVM host).

The CPU and memory resources used in the Kubernetes worker node are handled by the pod overhead included in the RuntimeClass (kata-remote) definition used for creating peer pods.

The total number of peer pod VMs running in the cloud is defined as Kubernetes Node extended resources. This limit is per node and is set by the PEERPODS_LIMIT_PER_NODE attribute in the peer-pods-cm config map.

The extended resource is named kata.peerpods.io/vm, and enables the Kubernetes scheduler to handle capacity tracking and accounting.

You can edit the limit per node based on the requirements for your environment after you install the OpenShift sandboxed containers Operator.

A mutating webhook adds the extended resource kata.peerpods.io/vm to the pod specification. It also removes any resource-specific entries from the pod specification, if present. This enables the Kubernetes scheduler to account for these extended resources, ensuring the peer pod is only scheduled when resources are available.

The mutating webhook modifies a Kubernetes pod as follows:

  • The mutating webhook checks the pod for the expected RuntimeClassName value, specified in the TARGET_RUNTIME_CLASS environment variable. If the value in the pod specification does not match the value in the TARGET_RUNTIME_CLASS, the webhook exits without modifying the pod.

  • If the RuntimeClassName values match, the webhook makes the following changes to the pod spec:

    1. The webhook removes every resource specification from the resources field of all containers and init containers in the pod.
    2. The webhook adds the extended resource (kata.peerpods.io/vm) to the spec by modifying the resources field of the first container in the pod. The extended resource kata.peerpods.io/vm is used by the Kubernetes scheduler for accounting purposes.
Note

The mutating webhook excludes specific system namespaces in OpenShift Container Platform from mutation. If a peer pod is created in those system namespaces, then resource accounting using Kubernetes extended resources does not work unless the pod spec includes the extended resource.

As a best practice, define a cluster-wide policy to only allow peer pod creation in specific namespaces.

You can deploy OpenShift sandboxed containers on IBM Z® and IBM® LinuxONE by using the command line interface (CLI) to perform the following tasks:

  1. Install the OpenShift sandboxed containers Operator.
  2. Optional: Configure the libvirt volume.
  3. Optional: Create a custom peer pod VM image.
  4. Create the peer pods secret.
  5. Create the peer pods config map.
  6. Create the pod VM image config map.
  7. Create the KVM host secret.
  8. Optional: Select a custom peer pod VM image.
  9. Optional: Customize the Kata agent policy.
  10. Create the KataConfig custom resource.
  11. Optional: Modify the number of virtual machines running on each worker node.
  12. Configure the OpenShift sandboxed containers workload objects.

6.2.1. Installing the OpenShift sandboxed containers Operator
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You can install the OpenShift sandboxed containers Operator by using the CLI.

Prerequisites

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

Procedure

  1. Create an osc-namespace.yaml manifest file: 

    apiVersion: v1
kind: Namespace
metadata:
  name: openshift-sandboxed-containers-operator
    Copy to Clipboard Toggle word wrap

  2. Create the namespace by running the following command: 

    $ oc apply -f osc-namespace.yaml
    Copy to Clipboard Toggle word wrap

  3. Create an osc-operatorgroup.yaml manifest file: 

    apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: sandboxed-containers-operator-group
  namespace: openshift-sandboxed-containers-operator
spec:
  targetNamespaces:
  - openshift-sandboxed-containers-operator
    Copy to Clipboard Toggle word wrap

  4. Create the operator group by running the following command: 

    $ oc apply -f osc-operatorgroup.yaml
    Copy to Clipboard Toggle word wrap

  5. Create an osc-subscription.yaml manifest file: 

    apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  name: sandboxed-containers-operator
  namespace: openshift-sandboxed-containers-operator
spec:
  channel: stable
  installPlanApproval: Automatic
  name: sandboxed-containers-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace
  startingCSV: sandboxed-containers-operator.v1.9.0
    Copy to Clipboard Toggle word wrap

  6. Create the subscription by running the following command: 

    $ oc apply -f osc-subscription.yaml
    Copy to Clipboard Toggle word wrap

  7. Verify that the Operator is correctly installed by running the following command: 

    $ oc get csv -n openshift-sandboxed-containers-operator
    Copy to Clipboard Toggle word wrap

    This command can take several minutes to complete.

  8. Watch the process by running the following command: 

    $ watch oc get csv -n openshift-sandboxed-containers-operator
    Copy to Clipboard Toggle word wrap

    Example output

    NAME                             DISPLAY                                  VERSION             REPLACES                   PHASE
openshift-sandboxed-containers   openshift-sandboxed-containers-operator  1.9.0    1.8.1        Succeeded
    Copy to Clipboard Toggle word wrap

6.2.2. Configuring the libvirt volume
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The OpenShift sandboxed containers Operator configures the libvirt volume and pool on your KVM host automatically during installation. If required, you can manually configure or create additional libvirt volumes and pools.

Prerequisites

  • You have installed the OpenShift sandboxed containers Operator on your OpenShift Container Platform cluster by using the OpenShift Container Platform web console or the command line.
  • You have administrator privileges for your KVM host.
  • You have installed podman on your KVM host.
  • You have installed virt-customize on your KVM host.
  • You have a /var/lib/libvirt/images/ directory for your images.

Procedure

  1. Log in to the KVM host.

  2. Set the name of the libvirt pool by running the following command: 

    $ export LIBVIRT_POOL=<libvirt_pool>
    Copy to Clipboard Toggle word wrap

    You need the LIBVIRT_POOL value to create the secret for the libvirt provider.

  3. Set the name of the libvirt volume by running the following command: 

    $ export LIBVIRT_VOL_NAME=<libvirt_volume>
    Copy to Clipboard Toggle word wrap

    You need the LIBVIRT_VOL_NAME value to create the secret for the libvirt provider.

  4. Set the path of the default storage pool location, by running the following command: 

    $ export LIBVIRT_POOL_DIRECTORY="/var/lib/libvirt/images/"
    Copy to Clipboard Toggle word wrap

  5. Create a libvirt pool by running the following command: 

    $ virsh pool-define-as $LIBVIRT_POOL --type dir --target "$LIBVIRT_POOL_DIRECTORY"
    Copy to Clipboard Toggle word wrap

  6. Start the libvirt pool by running the following command: 

    $ virsh pool-start $LIBVIRT_POOL
    Copy to Clipboard Toggle word wrap

  7. Create a libvirt volume for the pool by running the following command: 

    $ virsh -c qemu:///system \
  vol-create-as --pool $LIBVIRT_POOL \
  --name $LIBVIRT_VOL_NAME \
  --capacity 20G \
  --allocation 2G \
  --prealloc-metadata \
  --format qcow2
    Copy to Clipboard Toggle word wrap

6.2.3. Creating a custom peer pod VM image
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You can create a custom peer pod virtual machine (VM) image instead of using the default Operator-built image.

You build an Open Container Initiative (OCI) container with the peer pod QCOW2 image. Later, you add the container registry URL and the image path to the peer pod VM image config map.

Procedure

  1. Create a Dockerfile.podvm-oci file: 

    FROM scratch

ARG PODVM_IMAGE_SRC
ENV PODVM_IMAGE_PATH="/image/podvm.qcow2"

COPY $PODVM_IMAGE_SRC $PODVM_IMAGE_PATH
    Copy to Clipboard Toggle word wrap

  2. Build a container with the pod VM QCOW2 image by running the following command: 

    $ docker build -t podvm-libvirt \
  --build-arg PODVM_IMAGE_SRC=<podvm_image_source> \
    1 
    
  --build-arg PODVM_IMAGE_PATH=<podvm_image_path> \
    2 
    
  -f Dockerfile.podvm-oci .
    Copy to Clipboard Toggle word wrap
    1
    Specify the QCOW2 image source on the host.
    2
    Optional: Specify the path of the QCOW2 image if you do not use the default, /image/podvm.qcow2.

6.2.4. Updating the peer pods secret
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You must update the peer pods secret.

The secret stores credentials for creating the pod virtual machine (VM) image and peer pod instances.

By default, the OpenShift sandboxed containers Operator creates the secret based on the credentials used to create the cluster. However, you can manually create a secret that uses different credentials.

Prerequisites

  • LIBVIRT_URI. This value is the default gateway IP address of the libvirt network. Check your libvirt network setup to obtain this value.

    Note

    If libvirt uses the default bridge virtual network, you can obtain the LIBVIRT_URI by running the following commands: 

    $ virtint=$(bridge_line=$(virsh net-info default | grep Bridge);  echo "${bridge_line//Bridge:/}" | tr -d [:blank:])

$ LIBVIRT_URI=$( ip -4 addr show $virtint | grep -oP '(?<=inet\s)\d+(\.\d+){3}')

$ LIBVIRT_GATEWAY_URI="qemu+ssh://root@${LIBVIRT_URI}/system?no_verify=1"
    Copy to Clipboard Toggle word wrap
  • REDHAT_OFFLINE_TOKEN. You have generated this token to download the RHEL image at Red Hat API Tokens.

Procedure

  1. Create a peer-pods-secret.yaml manifest file according to the following example: 

    apiVersion: v1
kind: Secret
metadata:
  name: peer-pods-secret
  namespace: openshift-sandboxed-containers-operator
type: Opaque
stringData:
  CLOUD_PROVIDER: "libvirt"
  LIBVIRT_URI: "<libvirt_gateway_uri>"
    1 
    
  REDHAT_OFFLINE_TOKEN: "<rh_offline_token>"
    2
    Copy to Clipboard Toggle word wrap
    1
    Specify the libvirt URI.
    2
    Specify the Red Hat offline token, which is required for the Operator-built image.

  2. Create the secret by running the following command: 

    $ oc apply -f peer-pods-secret.yaml
    Copy to Clipboard Toggle word wrap

6.2.5. Creating the peer pods config map
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You must create the peer pods config map for OpenShift sandboxed containers.

Procedure

  1. Create a peer-pods-cm.yaml manifest file according to the following example: 

    apiVersion: v1
kind: ConfigMap
metadata:
  name: peer-pods-cm
  namespace: openshift-sandboxed-containers-operator
data:
  CLOUD_PROVIDER: "libvirt"
  PEERPODS_LIMIT_PER_NODE: "10"
    1 
    
  LIBVIRT_POOL: "<libvirt_pool>"
    2 
    
  LIBVIRT_VOL_NAME: "<libvirt_volume>"
    3 
    
  LIBVIRT_DIR_NAME: "/var/lib/libvirt/images/<directory_name>"
    4 
    
  LIBVIRT_NET: "default"
    5 
    
  DISABLECVM: "true"
    Copy to Clipboard Toggle word wrap
    1
    Specify the maximum number of peer pods that can be created per node. The default value is 10.
    2
    Specify the libvirt pool. If you have manually configured the libvirt pool, use the same name as in your KVM host configuration.
    3
    Specify the libvirt volume name. If you have manually configured the libvirt volume, use the same name as in your KVM host configuration.
    4
    Specify the libvirt directory for storing virtual machine disk images, such as .qcow2, or .raw files. To ensure libvirt has read and write access permissions, use a subdirectory of the libvirt storage directory. The default is /var/lib/libvirt/images/.
    5
    Optional: Specify a libvirt network if you do not want to use the default network.

  2. Create the config map by running the following command: 

    $ oc apply -f peer-pods-cm.yaml
    Copy to Clipboard Toggle word wrap

6.2.6. Creating the peer pod VM image config map
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You must create a config map for the peer pod virtual machine (VM) image.

Prerequisites

  • You must create an activation key by using the Red Hat Hybrid Cloud Console.
  • Optional: If you want to use a Cloud API Adaptor custom image, you must have the name, URL, and the branch or tag of the image.

Procedure

  1. Create a libvirt-podvm-image-cm.yaml manifest according to the following example: 

    apiVersion: v1
kind: ConfigMap
metadata:
  name: libvirt-podvm-image-cm
  namespace: openshift-sandboxed-containers-operator
data:
  PODVM_DISTRO: "rhel"
  DOWNLOAD_SOURCES: "no"
    1 
    
  CAA_SRC: "https://github.com/confidential-containers/cloud-api-adaptor"
    2 
    
  CAA_REF: "main"
    3 
    
  CONFIDENTIAL_COMPUTE_ENABLED: "yes"
  UPDATE_PEERPODS_CM: "yes"
  ORG_ID: "<rhel_organization_id>"
  ACTIVATION_KEY: "<rhel_activation_key>"
    4 
    
  IMAGE_NAME: "<podvm_libvirt_image>"
    5 
    
  PODVM_IMAGE_URI: "oci::<image_repo_url>:<image_tag>::<image_path>"
    6 
    
  SE_BOOT: "true"
    7 
    
  BASE_OS_VERSION: "<rhel_image_os_version>"
    8
    Copy to Clipboard Toggle word wrap
    1
    Specify yes if you want to use the custom Cloud API Adaptor source to build the pod VM image.
    2
    Optional: Specify the URL of the Cloud API Adaptor custom image.
    3
    Optional: Specify the branch or tag of the Cloud API Adaptor custom image.
    4
    Specify your RHEL activation key.
    5
    Specify the custom peer pod VM image name.
    6
    Optional: If you created a custom peer pod VM image, specify the container registry URL, the image tag, and the image path (default: /image/podvm.qcow2). Otherwise, set the value to "".
    7
    The default value, true, enables IBM Secure Execution for the default Operator-built image. If you use a custom peer pod VM image, set it to false .
    8
    Specify the RHEL image operating system version. IBM Z® Secure Execution supports RHEL 9.5 and later versions.

  2. Create the config map by running the following command: 

    $ oc apply -f libvirt-podvm-image-cm.yaml
    Copy to Clipboard Toggle word wrap

    The libvirt pod VM image config map is created for your libvirt provider.

6.2.7. Creating the KVM host secret
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You must create the secret for your KVM host.

Procedure

  1. Generate an SSH key pair by running the following command: 

    $ ssh-keygen -f ./id_rsa -N ""
    Copy to Clipboard Toggle word wrap

  2. Copy the public SSH key to your KVM host: 

    $ ssh-copy-id -i ./id_rsa.pub <KVM_HOST_IP>
    1
    Copy to Clipboard Toggle word wrap
    1
    Specify the IP address of your KVM host or the LPAR where the peer pod VM is running. For example, 192.168.122.1.

  3. Create the Secret object by running the following command: 

    $ oc create secret generic ssh-key-secret \
  -n openshift-sandboxed-containers-operator \
  --from-file=id_rsa.pub=./id_rsa.pub \
  --from-file=id_rsa=./id_rsa
    Copy to Clipboard Toggle word wrap

  4. Delete the SSH keys you created: 

    $ shred --remove id_rsa.pub id_rsa
    Copy to Clipboard Toggle word wrap

6.2.8. Selecting a custom peer pod VM image
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You can select a custom peer pod virtual machine (VM) image, tailored to your workload requirements by adding an annotation to the pod manifest. The custom image overrides the default image specified in the peer pods config map. You create a new libvirt volume in your libvirt pool and upload the custom peer pod VM image to the new volume. Then, you update the pod manifest to use the custom peer pod VM image.

Prerequisites

  • The ID of the custom pod VM image to use, compatible with the cloud provider or hypervisor, is available.

Procedure

  1. Set the name of the libvirt pool by running the following command: 

    $ export LIBVIRT_POOL=<libvirt_pool>
    1
    Copy to Clipboard Toggle word wrap
    1
    Specify the existing libvirt pool name.

  2. Set the name of the new libvirt volume by running the following command: 

    $ export LIBVIRT_VOL_NAME=<new_libvirt_volume>
    Copy to Clipboard Toggle word wrap

  3. Create a libvirt volume for the pool by running the following command: 

    $ virsh -c qemu:///system \
  vol-create-as --pool $LIBVIRT_POOL \
  --name $LIBVIRT_VOL_NAME \
  --capacity 20G \
  --allocation 2G \
  --prealloc-metadata \
  --format qcow2
    Copy to Clipboard Toggle word wrap

  4. Upload the custom peer pod VM image to the libvirt volume: 

    $ virsh -c qemu:///system vol-upload \
  --vol $LIBVIRT_VOL_NAME <custom_podvm_image.qcow2> \
    1 
    
  --pool $LIBVIRT_POOL --sparse
    Copy to Clipboard Toggle word wrap
    1
    Specify the custom peer pod VM image name.

  5. Create a pod-manifest.yaml manifest file according to the following example: 

    apiVersion: v1
kind: Pod
metadata:
  name: pod-manifest
  annotations:
    io.katacontainers.config.hypervisor.image: "<new_libvirt_volume>"
    1 
    
spec:
  runtimeClassName: kata-remote
    2 
    
  containers:
  - name: <example_container>
    3 
    
    image: registry.access.redhat.com/ubi9/ubi:9.3
    command: ["sleep", "36000"]
    Copy to Clipboard Toggle word wrap
    1
    Specify the libvirt volume name where you have uploaded the custom peer pod VM image.
    2
    Ensure that the runtimeClassName field is set to kata-remote to create a peer pod.
    3
    Specify the container name.

  6. Create the pod by running the following command: 

    $ oc apply -f pod-manifest.yaml
    Copy to Clipboard Toggle word wrap

6.2.9. Customizing the Kata agent policy
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The Kata agent policy is a security mechanism that controls agent API requests for pods running with the Kata runtime. Written in Rego and enforced by the Kata agent within the pod virtual machine (VM), this policy determines which operations are allowed or denied.

You can override the default policy with a custom one for specific use cases, such as development and testing where security is not a concern. For example, you might run in an environment where the control plane can be trusted. You can apply a custom policy in several ways:

  • Embedding it in the pod VM image.
  • Patching the peer pods config map.
  • Adding an annotation to the workload pod YAML.

For production systems, the preferred method is to use initdata to override the Kata agent policy. The following procedure applies a custom policy to an individual pod using the io.katacontainers.config.agent.policy annotation. The policy is provided in Base64-encoded Rego format. This approach overrides the default policy at pod creation without modifying the pod VM image.

Note

A custom policy replaces the default policy entirely. To modify only specific APIs, include the full policy and adjust the relevant rules.

Procedure

  1. Create a policy.rego file with your custom policy. The following example shows all configurable APIs, with exec and log enabled for demonstration: 

    package agent_policy

import future.keywords.in
import input

default CopyFileRequest := false
default CreateContainerRequest := false
default CreateSandboxRequest := true
default DestroySandboxRequest := true
default ExecProcessRequest := true  # Enabled to allow exec API
default GetOOMEventRequest := true
default GuestDetailsRequest := true
default OnlineCPUMemRequest := true
default PullImageRequest := true
default ReadStreamRequest := true   # Enabled to allow log API
default RemoveContainerRequest := true
default RemoveStaleVirtiofsShareMountsRequest := true
default SignalProcessRequest := true
default StartContainerRequest := true
default StatsContainerRequest := true
default TtyWinResizeRequest := true
default UpdateEphemeralMountsRequest := true
default UpdateInterfaceRequest := true
default UpdateRoutesRequest := true
default WaitProcessRequest := true
default WriteStreamRequest := false
    Copy to Clipboard Toggle word wrap

    This policy enables the exec (ExecProcessRequest) and log (ReadStreamRequest) APIs. Adjust the true or false values to customize the policy further based on your needs.

  2. Convert the policy.rego file to a Base64-encoded string by running the following command: 

    $ base64 -w0 policy.rego
    Copy to Clipboard Toggle word wrap

    Save the output for use in the yaml file.

  3. Add the Base64-encoded policy to a my-pod.yaml pod specification file: 

    apiVersion: v1
kind: Pod
metadata:
  name: <pod_name>
  annotations:
    io.katacontainers.config.agent.policy: <base64_encoded_policy>
spec:
  runtimeClassName: kata-remote
  containers:
  - name: <container_name>
    image: registry.access.redhat.com/ubi9/ubi:latest
    command:
    - sleep
    - "36000"
    securityContext:
      privileged: false
      seccompProfile:
        type: RuntimeDefault
    Copy to Clipboard Toggle word wrap

  4. Apply the pod manifest by running the following command: 

    $ oc apply -f my-pod.yaml
    Copy to Clipboard Toggle word wrap

6.2.10. Creating the KataConfig custom resource
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You must create the KataConfig custom resource (CR) to install kata-remote as a runtime class on your worker nodes.

Creating the KataConfig CR triggers the OpenShift sandboxed containers Operator to do the following:

  • Create a RuntimeClass CR named kata-remote with a default configuration. This enables users to configure workloads to use kata-remote as the runtime by referencing the CR in the RuntimeClassName field. This CR also specifies the resource overhead for the runtime.

OpenShift sandboxed containers installs kata-remote as a secondary, optional runtime on the cluster and not as the primary runtime.

Important

Creating the KataConfig CR automatically reboots the worker nodes. The reboot can take from 10 to more than 60 minutes. Factors that impede reboot time are as follows:

  • A larger OpenShift Container Platform deployment with a greater number of worker nodes.
  • Activation of the BIOS and Diagnostics utility.
  • Deployment on a hard disk drive rather than an SSD.
  • Deployment on physical nodes such as bare metal, rather than on virtual nodes.
  • A slow CPU and network.

Prerequisites

  • You have access to the cluster as a user with the cluster-admin role.

Procedure

  1. Create an example-kataconfig.yaml manifest file according to the following example: 

    apiVersion: kataconfiguration.openshift.io/v1
kind: KataConfig
metadata:
  name: example-kataconfig
spec:
  enablePeerPods: true
  logLevel: info
#  kataConfigPoolSelector:
#    matchLabels:
#      <label_key>: '<label_value>'
    1
    Copy to Clipboard Toggle word wrap
    1
    Optional: If you have applied node labels to install kata-remote on specific nodes, specify the key and value, for example, osc: 'true'.

  2. Create the KataConfig CR by running the following command: 

    $ oc apply -f example-kataconfig.yaml
    Copy to Clipboard Toggle word wrap

    The new KataConfig CR is created and installs kata-remote as a runtime class on the worker nodes.

    Wait for the kata-remote installation to complete and the worker nodes to reboot before verifying the installation.

  3. Monitor the installation progress by running the following command: 

    $ watch "oc describe kataconfig | sed -n /^Status:/,/^Events/p"
    Copy to Clipboard Toggle word wrap

    When the status of all workers under kataNodes is installed and the condition InProgress is False without specifying a reason, the kata-remote is installed on the cluster.

  4. Verify that you have built the peer pod image and uploaded it to the libvirt volume by running the following command: 

    $ oc describe configmap peer-pods-cm -n openshift-sandboxed-containers-operator
    Copy to Clipboard Toggle word wrap

    Example output

    Name: peer-pods-cm
Namespace: openshift-sandboxed-containers-operator
Labels: <none>
Annotations: <none>

Data
====
CLOUD_PROVIDER: libvirt

BinaryData
====
Events: <none>
    Copy to Clipboard Toggle word wrap

  5. Monitor the kata-oc machine config pool progress to ensure that it is in the UPDATED state, when UPDATEDMACHINECOUNT equals MACHINECOUNT, by running the following command: 

    $ watch oc get mcp/kata-oc
    Copy to Clipboard Toggle word wrap

  6. Verify the daemon set by running the following command: 

    $ oc get -n openshift-sandboxed-containers-operator ds/osc-caa-ds
    Copy to Clipboard Toggle word wrap

  7. Verify the runtime classes by running the following command: 

    $ oc get runtimeclass
    Copy to Clipboard Toggle word wrap

    Example output

    NAME             HANDLER          AGE
kata             kata             152m
kata-remote      kata-remote      152m
    Copy to Clipboard Toggle word wrap

6.2.11. Modifying the number of peer pod VMs per node
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You can modify the limit of peer pod virtual machines (VMs) per node by editing the peerpodConfig custom resource (CR).

Procedure

  1. Check the current limit by running the following command: 

    $ oc get peerpodconfig peerpodconfig-openshift -n openshift-sandboxed-containers-operator \
-o jsonpath='{.spec.limit}{"\n"}'
    Copy to Clipboard Toggle word wrap

  2. Modify the limit attribute of the peerpodConfig CR by running the following command: 

    $ oc patch peerpodconfig peerpodconfig-openshift -n openshift-sandboxed-containers-operator \
--type merge --patch '{"spec":{"limit":"<value>"}}'
    1
    Copy to Clipboard Toggle word wrap
    1
    Replace <value> with the limit you want to define.

6.2.12. Configuring workload objects
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You must configure OpenShift sandboxed containers workload objects by setting kata-remote as the runtime class for the following pod-templated objects:

  • Pod objects
  • ReplicaSet objects
  • ReplicationController objects
  • StatefulSet objects
  • Deployment objects
  • DeploymentConfig objects
Important

Do not deploy workloads in an Operator namespace. Create a dedicated namespace for these resources.

Prerequisites

  • You have created the KataConfig custom resource (CR).

Procedure

  1. Add spec.runtimeClassName: kata-remote to the manifest of each pod-templated workload object as in the following example: 

    apiVersion: v1
kind: <object>
# ...
spec:
  runtimeClassName: kata-remote
# ...
    Copy to Clipboard Toggle word wrap

    OpenShift Container Platform creates the workload object and begins scheduling it.

Verification

  • Inspect the spec.runtimeClassName field of a pod-templated object. If the value is kata-remote, then the workload is running on OpenShift sandboxed containers, using peer pods.
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