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You can enable Linux control group version 2 (cgroup v2) in your cluster by editing the node.config object. Enabling cgroup v2 in OKD disables all cgroups version 1 controllers and hierarchies in your cluster. cgroup v1 is enabled by default.

cgroup v2 is the next version of the Linux cgroup API. cgroup v2 offers several improvements over cgroup v1, including a unified hierarchy, safer sub-tree delegation, new features such as Pressure Stall Information, and enhanced resource management and isolation.

OKD cgroups version 2 support 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/.

Enabling Linux cgroup v2 during installation

You can enable Linux control group version 2 (cgroup v2) when you install a cluster by creating installation manifests.

Procedure
  1. Create or edit the node.config object to specify the v2 cgroup:

    apiVersion: config.openshift.io/v1
    kind: Node
    metadata:
      name: cluster
      spec:
        cgroupMode: "v2"
  2. Create or edit the FeatureGate object to enable the TechPreviewNoUpgrade feature set:

    apiVersion: config.openshift.io/v1
    kind: FeatureGate
    metadata:
      name: cluster
      spec:
        featureSet: "TechPreviewNoUpgrade"
  3. Proceed with the installation as usual.