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Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. We are beginning with these four terms: master, slave, blacklist, and whitelist. Because of the enormity of this endeavor, these changes will be implemented gradually over several upcoming releases. For more details, see our CTO Chris Wright’s message.

About Red Hat OpenShift Virtualization

Red Hat OpenShift Virtualization enables you to bring traditional virtual machines (VMs) into OpenShift Container Platform where they run alongside containers, and are managed as native Kubernetes objects.

OpenShift Virtualization is represented by the OpenShift Virtualization icon.

You can use OpenShift Virtualization with either the OVN-Kubernetes or the OpenShiftSDN default Container Network Interface (CNI) network provider.

Prepare your cluster for OpenShift Virtualization.

OpenShift Virtualization supported cluster version

OpenShift Virtualization 4.11 is supported for use on OpenShift Container Platform 4.11 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, refer to Certified Guest Operating Systems in Red Hat OpenStack Platform, Red Hat Virtualization and OpenShift Virtualization.

New and changed features

  • You can now deploy OpenShift Virtualization on a three-node cluster with zero compute nodes.

  • Virtual machines run as unprivileged workloads in session mode by default. This feature improves cluster security by mitigating escalation-of-privilege attacks.

  • Red Hat Enterprise Linux (RHEL) 9 is now supported as a guest operating system.

  • The link for installing the Migration Toolkit for Virtualization (MTV) Operator in the OpenShift Container Platform web console has been moved. It is now located in the Related operators section of the Getting started resources card on the VirtualizationOverview page.

  • You can configure the verbosity level of the virtLauncher, virtHandler, virtController, virtAPI, and virtOperator pod logs to debug specific components by editing the HyperConverged custom resource (CR).

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 Virtualization console and then select Quick Starts. You can filter the available tours by entering the virtualization keyword in the Filter field.

Storage

Web console

  • You can set the boot mode of templates and virtual machines to BIOS, UEFI, or UEFI (secure) by using the web console.

  • You can now enable and disable the descheduler from the web console on the Scheduling tab of the VirtualMachine details page.

  • You can access virtual machines by navigating to VirtualizationVirtualMachines in the side menu. Each virtual machine now has an updated Overview tab that provides information about the virtual machine configuration, alerts, snapshots, network interfaces, disks, usage data, and hardware devices.

  • The Create a Virtual Machine wizard in the web console is now replaced by the Catalog page, which lists available templates that you can use to create a virtual machine. You can use a template with an available boot source to quickly create a virtual machine or you can customize a template to create a virtual machine.

  • If your Windows virtual machine has a vGPU attached, you can now switch between the default display and the vGPU display by using the web console.

  • You can access virtual machine templates by navigating to VirtualizationTemplates in the side menu. The updated VirtualMachine Templates page now provides useful information about each template, including workload profile, boot source, and CPU and memory configuration.

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.

  • In a future release, support for the legacy HPP custom resource, and the associated storage class, will be deprecated. Beginning in OpenShift Virtualization 4.11, the HPP Operator uses the Kubernetes Container Storage Interface (CSI) driver to configure local storage. The Operator continues to support the existing (legacy) format of the HPP custom resource and the associated storage class. If you use the HPP Operator, plan to create a storage class for the CSI driver as part of your migration strategy.

Removed features

Removed features are not supported in the current release.

  • OpenShift Virtualization 4.11 removes support for nmstate, including the following objects:

    • NodeNetworkState

    • NodeNetworkConfigurationPolicy

    • NodeNetworkConfigurationEnactment

    To preserve and support your existing nmstate configuration, install the Kubernetes NMState Operator before updating to OpenShift Virtualization 4.11. You can install it from the OperatorHub in the OpenShift Container Platform web console, or by using the OpenShift CLI (oc).

  • The Node Maintenance Operator (NMO) is no longer shipped with OpenShift Virtualization. You can install the NMO from the OperatorHub in the OpenShift Container Platform web console, or by using the OpenShift CLI (oc).

    You must perform one of the following tasks before updating to OpenShift Virtualization 4.11 from OpenShift Virtualization 4.10.2 and later releases:

    • Move all nodes out of maintenance mode.

    • Install the standalone NMO and replace the nodemaintenances.nodemaintenance.kubevirt.io custom resource (CR) with a nodemaintenances.nodemaintenance.medik8s.io CR.

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 feature