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OpenShift Virtualization release notes

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About Red Hat OpenShift Virtualization

With Red Hat OpenShift Virtualization, you can bring traditional virtual machines (VMs) into OpenShift Container Platform and run them alongside containers. In OpenShift Virtualization, VMs are native Kubernetes objects that you can manage by using the OpenShift Container Platform web console or the command line.

OpenShift Virtualization is represented by the OpenShift Virtualization icon.

You can use OpenShift Virtualization the OVN-Kubernetes Container Network Interface (CNI) network provider.

Learn more about what you can do with OpenShift Virtualization.

Learn more about OpenShift Virtualization architecture and deployments.

Prepare your cluster for OpenShift Virtualization.

OpenShift Virtualization supported cluster version

OpenShift Virtualization 4.17 is supported for use on OpenShift Container Platform 4.17 clusters. To use the latest z-stream release of OpenShift Virtualization, you must first upgrade to the latest version of OpenShift Container Platform.

Supported guest operating systems

To view the supported guest operating systems for OpenShift Virtualization, see Certified Guest Operating Systems in Red Hat OpenStack Platform, Red Hat Virtualization, OpenShift Virtualization and Red Hat Enterprise Linux with KVM.

Microsoft Windows SVVP certification

OpenShift Virtualization is certified in Microsoft’s Windows Server Virtualization Validation Program (SVVP) to run Windows Server workloads.

The SVVP certification applies to:

  • Red Hat Enterprise Linux CoreOS workers. In the Microsoft SVVP Catalog, they are named Red Hat OpenShift Container Platform 4 on RHEL CoreOS 9.

  • Intel and AMD CPUs.

Quick starts

Quick start tours are available for several OpenShift Virtualization features. To view the tours, click the Help icon ? in the menu bar on the header of the OpenShift Container Platform web console and then select Quick Starts. You can filter the available tours by entering the keyword virtualization in the Filter field.

New and changed features

This release adds new features and enhancements related to the following components and concepts:

Installation and update

Infrastructure

Virtualization

Networking

Storage

  • The VirtualMachineSnapshot API version is now v1beta1.

  • The VirtualMachineExport API version is now v1beta1.

Web console

Monitoring

Notable technical changes

Deprecated and removed features

Deprecated features

Deprecated features are included in the current release and supported. However, they will be removed in a future release and are not recommended for new deployments.

  • The tekton-tasks-operator is deprecated and Tekton tasks and example pipelines are now deployed by the ssp-operator.

  • The copy-template, modify-vm-template, and create-vm-from-template tasks are deprecated.

  • Support for Windows Server 2012 R2 templates is deprecated.

  • The alerts KubeVirtComponentExceedsRequestedMemory and KubeVirtComponentExceedsRequestedCPU are deprecated. You can safely silence them.

Removed features

Removed features are not supported in the current release.

Technology Preview features

Some features in this release are currently in Technology Preview. These experimental features are not intended for production use. Note the following scope of support on the Red Hat Customer Portal for these features:

Technology Preview Features Support Scope

  • Cluster admins can now use the wasp-agent tool to configure a higher VM workload density in their clusters by overcommitting the amount of memory, in RAM, and assigning swap resources to VM workloads.

Bug fixes

Known issues

Monitoring

Networking

Nodes

  • Uninstalling OpenShift Virtualization does not remove the feature.node.kubevirt.io node labels created by OpenShift Virtualization. You must remove the labels manually. (CNV-38543)

  • In a heterogeneous cluster with different compute nodes, virtual machines that have HyperV reenlightenment enabled cannot be scheduled on nodes that do not support timestamp-counter scaling (TSC) or have the appropriate TSC frequency. (BZ#2151169)

Storage

  • If you clone more than 100 VMs using the csi-clone cloning strategy, then the Ceph CSI might not purge the clones. Manually deleting the clones might also fail. (CNV-23501)

    • As a workaround, you can restart the ceph-mgr to purge the VM clones.

Virtualization

  • When adding a virtual Trusted Platform Module (vTPM) device to a Windows VM, the BitLocker Drive Encryption system check passes even if the vTPM device is not persistent. This is because a vTPM device that is not persistent stores and recovers encryption keys using ephemeral storage for the lifetime of the virt-launcher pod. When the VM migrates or is shut down and restarts, the vTPM data is lost. (CNV-36448)

  • OpenShift Virtualization links a service account token in use by a pod to that specific pod. OpenShift Virtualization implements a service account volume by creating a disk image that contains a token. If you migrate a VM, then the service account volume becomes invalid. (CNV-33835)

    • As a workaround, use user accounts rather than service accounts because user account tokens are not bound to a specific pod.

Web console

  • When you create a persistent volume claim (PVC) by selecting With Data upload form from the Create PersistentVolumeClaim list in the web console, uploading data to the PVC by using the Upload Data field fails. (CNV-37607)