6.6. Enabling OpenShift Container Platform features using FeatureGates
As an administrator, you can turn on features that are Technology Preview features.
6.6.1. Understanding FeatureGates 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.
For more information about the support scope of Red Hat Technology Preview features, see https://access.redhat.com/support/offerings/techpreview/.
This allows you, for example, to ensure that Technology Preview features are off for production clusters while leaving the features on for test clusters where you can fully test them.
6.6.2. Features that are affected by FeatureGates
The following features are affected by FeatureGates:
| FeatureGate | Description | Default |
|---|---|---|
|
| Enables the rotation of the server TLS certificate on the cluster. | True |
|
| Enables support for limiting the number of processes (PIDs) running in a pod. | True |
|
| Enables automatically repairing unhealthy machines in a machine pool. | True |
|
|
Enable the consumption of local ephemeral storage and also the | False |
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.
6.6.3. Enabling Technology Preview features using FeatureGates
You can turn Technology Preview features on and off for all nodes in the cluster by editing the FeatureGates 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.
Procedure
To turn on the Technology Preview features for the entire cluster:
Create the FeatureGates instance:
-
Switch to the Administration
Custom Resource Definitions page. - On the Custom Resource Definitions page, click FeatureGate.
- On the Custom Resource Definitions page, click the Actions Menu and select View Instances.
- On the Feature Gates page, click Create Feature Gates.
Replace the code with following sample:
apiVersion: config.openshift.io/v1 kind: FeatureGate metadata: name: cluster spec: {}- Click Create.
-
Switch to the Administration
To turn on the Technology Preview features, change the
specparameter to:apiVersion: config.openshift.io/v1 kind: FeatureGate metadata: name: cluster spec: featureSet: TechPreviewNoUpgrade 1- 1
- Add
featureSet: TechPreviewNoUpgradeto enable the Technology Preview features that are affected by FeatureGates.
