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Chapter 2. Container-native virtualization release notes

2.1. Container-native virtualization release notes

2.1.1. About container-native virtualization 2.2

2.1.1.1. What you can do with container-native virtualization

Container-native virtualization is an add-on to OpenShift Container Platform that allows you to run and manage virtual machine workloads alongside container workloads.

Container-native virtualization adds new objects into your OpenShift Container Platform cluster via Kubernetes custom resources to enable virtualization tasks. These tasks include:

  • Creating and managing Linux and Windows virtual machines
  • Connecting to virtual machines through a variety of consoles and CLI tools
  • Importing and cloning existing virtual machines
  • Managing network interface controllers and storage disks attached to virtual machines
  • Live migrating virtual machines between nodes

An enhanced web console provides a graphical portal to manage these virtualized resources alongside the OpenShift Container Platform cluster containers and infrastructure.

2.1.1.2. Container-native virtualization support

Important

container-native virtualization 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 https://access.redhat.com/support/offerings/techpreview/.

2.1.2. New and changed features

  • Managing virtual machines is simpler and more efficient due to improvements in design and workflow. You can now:

    • Run the virtual machine wizard with less navigation. The wizard now uses a comprehensive in-page style and includes a review page for confirming configuration details before submission.
    • Import a single VMware virtual machine with less navigation.
    • Edit virtual machine templates as well as virtual machine configurations.
    • Monitor health of virtual machine-backed services as you would for Pod-based services.
    • Enable persistent local storage for virtual machine images.
    • Add, edit, and view virtual CD-ROM devices attached to a virtual machine.
    • Add and view network attachment definitions with a graphical editor.

2.1.3. Resolved issues

  • Previously, when you added a disk to a virtual machine via the Disks tab in the web console, the added disk had a Filesystem volumeMode regardless of the volumeMode set in the kubevirt-storage-class-default ConfigMap. This issue has been fixed. (BZ#1753688)
  • Previously, when navigating to the Virtual Machines Console tab, sometimes no content was displayed. This issue has been fixed. (BZ#1753606)
  • Previously, attempting to list all instances of the container-native virtualization operator from a browser resulted in a 404 (page not found) error. This issue has been fixed. (BZ#1757526)
  • Previously, if a virtual machine used guaranteed CPUs, it was not scheduled because the label cpumanager=true was not automatically set on nodes. This issue has been fixed. (BZ#1718944)

2.1.4. Known issues

  • If you have container-native virtualization 2.1.0 deployed, you must first upgrade container-native virtualization to 2.2.0 before upgrading OpenShift Container Platform. Upgrading OpenShift Container Platform before upgrading container-native virtualization might trigger virtual machine deletion. (BZ#1785661)
  • The masquerade binding method for virtual machines cannot be used in clusters with RHEL 7 compute nodes. (BZ#1741626)

  • After migration, a virtual machine is assigned a new IP address. However, the commands oc get vmi and oc describe vmi still generate output containing the obsolete IP address. (BZ#1686208)

    • As a workaround, view the correct IP address by running the following command: 

      $ oc get pod -o wide
  • Some resources are improperly retained when removing container-native virtualization. You must manually remove these resources in order to reinstall container-native virtualization. (BZ#1712429)

  • Users without administrator privileges cannot add a network interface to a project in an L2 network using the virtual machine wizard. This issue is caused by missing permissions that allow users to load network attachment definitions. (BZ#1743985)

    • As a workaround, provide the user with permissions to load the network attachment definitions.

      1. Define ClusterRole and ClusterRoleBinding objects to the YAML configuration file, using the following examples: 

        apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
 name: cni-resources
rules:
- apiGroups: ["k8s.cni.cncf.io"]
 resources: ["*"]
 verbs: ["*"]
        apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: <role-binding-name>
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cni-resources
subjects:
- kind: User
  name: <user to grant the role to>
  namespace: <namespace of the user>

      2. As a cluster-admin user, run the following command to create the ClusterRole and ClusterRoleBinding objects you defined: 

        $ oc create -f <filename>.yaml

  • Live migration fails when nodes have different CPU models. Even in cases where nodes have the same physical CPU model, differences introduced by microcode updates have the same effect. This is because the default settings trigger host CPU passthrough behavior, which is incompatible with live migration. (BZ#1760028)

    • As a workaround, set the default CPU model in the kubevirt-config ConfigMap, as shown in the following example:

      Note

      You must make this change before starting the virtual machines that support live migration.

      1. Open the kubevirt-config ConfigMap for editing by running the following command: 

        $ oc edit configmap kubevirt-config -n openshift-cnv

      2. Edit the ConfigMap: 

        kind: ConfigMap
metadata:
  name: kubevirt-config
data:
  default-cpu-model: "<cpu-model>" 1
        1
        Replace <cpu-model> with the actual CPU model value. You can determine this value by running oc describe node <node> for all nodes and looking at the cpu-model-<name> labels. Select the CPU model that is present on all of your nodes.

  • When running virtctl image-upload to upload large VM disk images in qcow2 format, an end-of-file (EOF) error may be reported after the data is transmitted, even though the upload is either progressing normally or completed. (BZ#1789093)

    Run the following command to check the status of an upload on a given PVC: 

    $ oc describe pvc <pvc-name> | grep cdi.kubevirt.io/storage.pod.phase

  • When attempting to create and launch a virtual machine using a Haswell CPU, the launch of the virtual machine can fail due to incorrectly labeled nodes. This is a change in behavior from previous versions of container-native virtualization, where virtual machines could be successfully launched on Haswell hosts. (BZ#1781497)

    As a workaround, select a different CPU model, if possible.

  • If you select a directory that shares space with your operating system, you can potentially exhaust the space on the partition, causing the node to be non-functional. Instead, create a separate partition and point the hostpath provisioner to that partition so it will not interfere with your operating system. (BZ#1793132)
  • The container-native virtualization upgrade process occasionally fails due to an interruption from the Operator Lifecycle Manager (OLM). This issue is caused by the limitations associated with using a declarative API to track the state of container-native virtualization Operators. Enabling automatic updates during installation decreases the risk of encountering this issue. (BZ#1759612)
  • Container-native virtualization cannot reliably identify node drains that are triggered by running either oc adm drain or kubectl drain. Do not run these commands on the nodes of any clusters where container-native virtualization is deployed. The nodes might not drain if there are virtual machines running on top of them. The current solution is to put nodes into maintenance. (BZ#1707427)

  • If you navigate to the Subscription tab on the Operators Installed Operators page and click the current upgrade channel to edit it, there might be no visible results. If this occurs, there are no visible errors. (BZ#1796410)

    • As a workaround, trigger the upgrade process to container-native virtualization 2.2 from the CLI by running the following oc patch command: 

      $ export TARGET_NAMESPACE=openshift-cnv CNV_CHANNEL=2.2 && oc patch -n "${TARGET_NAMESPACE}" $(oc get subscription -n ${TARGET_NAMESPACE} --no-headers -o name) --type='json' -p='[{"op": "replace", "path": "/spec/channel", "value":"'${CNV_CHANNEL}'"}, {"op": "replace", "path": "/spec/installPlanApproval", "value":"Automatic"}]'

      This command points your subscription to upgrade channel 2.2 and enables automatic updates.

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