Understanding feature gates and Technology Preview features

You can use the FeatureGate custom resource to enable Technology Preview features throughout your cluster. This allows you, for example, to enable Technology Preview features on test clusters where you can fully test them while ensuring they are disabled on production clusters.

After turning Technology Preview features on using feature gates, they cannot be turned off and cluster upgrades are prevented.

Features that are affected by FeatureGates

The following Technology Preview features included in OKD:

FeatureGate Description Default


Enables the rotation of the server TLS certificate on the cluster.



Enables support for limiting the number of processes (PIDs) running in a pod.



Enables automatically repairing unhealthy machines in a machine pool.



Enable the consumption of local ephemeral storage and also the sizeLimit property of an emptyDir volume.


You can enable these features by editing the Feature Gate Custom Resource. Turning on these features cannot be undone and prevents the ability to upgrade your cluster.

Enabling Technology Preview features using feature gates

You can turn on Technology Preview features on for all nodes in the cluster by editing the FeatureGate custom resource, named cluster, in the openshift-config project.

The following Technology Preview features are enabled by feature gates:

  • RotateKubeletServerCertificate

  • SupportPodPidsLimit

Turning on Technology Preview features using the FeatureGate custom resource cannot be undone and prevents upgrades.


To turn on the Technology Preview features for the entire cluster:

  1. In the OKD web console, switch to the AdministrationCustom Resource Definitions page.

  2. On the Custom Resource Definitions page, click FeatureGate.

  3. On the Custom Resource Definitions page, click ActionsView Instances.

  4. On the Feature Gates page, click Create Feature Gates.

  5. Add the featureSet parameter:

    apiVersion: config.openshift.io/v1
    kind: FeatureGate
      name: cluster
      featureSet: "TechPreviewNoUpgrade" (1)
    1 Add the featureSet: "TechPreviewNoUpgrade" parameter.
  6. Click Save.