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About Red Hat OpenShift support for Windows Containers

Windows Container Support for Red Hat OpenShift enables running Windows compute nodes in an OKD cluster. Running Windows workloads is possible by using the Red Hat Windows Machine Config Operator (WMCO) to install and manage Windows nodes. With Windows nodes available, you can run Windows container workloads in OKD.

The release notes for Red Hat OpenShift for Windows Containers tracks the development of the WMCO, which provides all Windows container workload capabilities in OKD.

Release notes for Red Hat Windows Machine Config Operator 6.0.0

This release of the WMCO provides bug fixes for running Windows compute nodes in an OKD cluster. The components of the WMCO 6.0.0 were released in

New features and improvements

Windows node certificates are updated

With this release, the WMCO updates the Windows node certificates when the kubelet client certificate authority (CA) certificate is rotated.

Windows Machine Config Operator prerequisites

The following information details the supported platform versions, Windows Server versions, and networking configurations for the Windows Machine Config Operator. See the vSphere documentation for any information that is relevant to only that platform.

WMCO 6.0.0 supported platforms and Windows Server versions

The following table lists the Windows Server versions that are supported by WMCO 6.0.0, based on the applicable platform. Windows Server versions not listed are not supported and attempting to use them will cause errors. To prevent these errors, use only an appropriate version for your platform.

Platform Supported Windows Server version

Amazon Web Services (AWS)

Windows Server 2019

Microsoft Azure

Windows Server 2019

VMware vSphere

Windows Server 20H2

Bare metal or provider agnostic

Windows Server 2019

Supported networking

Hybrid networking with OVN-Kubernetes is the only supported networking configuration. See the additional resources below for more information on this functionality. The following tables outline the type of networking configuration and Windows Server versions to use based on your platform. You must specify the network configuration when you install the cluster. Be aware that OpenShift SDN networking is the default network for OKD clusters. However, OpenShift SDN is not supported by WMCO.

Table 1. Platform networking support
Platform Supported networking

Amazon Web Services (AWS)

Hybrid networking with OVN-Kubernetes

Microsoft Azure

Hybrid networking with OVN-Kubernetes

VMware vSphere

Hybrid networking with OVN-Kubernetes with a custom VXLAN port

bare metal

Hybrid networking with OVN-Kubernetes

Table 2. Hybrid OVN-Kubernetes Windows Server support
Hybrid networking with OVN-Kubernetes Supported Windows Server version

Default VXLAN port

Windows Server Long-Term Servicing Channel (LTSC): Windows Server 2019

Custom VXLAN port

Windows Server Semi-Annual Channel (SAC): Windows Server 20H2

Running Windows container workloads is not supported for clusters in a restricted network or disconnected environment.