Chapter 3. Enabling Linux control group version 2 (cgroup v2)
You can enable Linux control group version 2 (cgroup v2) in your cluster by editing the node.config object. Enabling cgroup v2 in OpenShift Container Platform 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.
OpenShift Container Platform 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 Technology Preview Features Support Scope.
3.1. 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
Create or edit the
node.configobject to specify thev2cgroup:apiVersion: config.openshift.io/v1 kind: Node metadata: name: cluster spec: cgroupMode: "v1"
Create or edit the
FeatureGateobject to enable theTechPreviewNoUpgradefeature set:apiVersion: config.openshift.io/v1 kind: FeatureGate metadata: name: cluster spec: featureSet: "TechPreviewNoUpgrade"- Proceed with the installation as usual.
