How to Configure Default Storage Class in OpenShift?

#openshift #odf #storageclass

Setting the default storage class in Kubernetes can be accomplished through editing the storage class YAML file or using the patch command. Simply add the following annotation to the desired storage class YAML:

annotations:
  storageclass.kubernetes.io/is-default-class: "true"

This will mark the storage class as the default class in your OpenShift cluster, allowing it to be automatically used by any Persistent Volume Claims that do not specify a storage class.

You can also use the patch command to modify an existing storage class in OpenShift. Here's an example patch command that modifies the ocs-storagecluster-ceph-rbd storage class:

oc patch storageclass ocs-storagecluster-ceph-rbd -p '{"metadata": {"annotations": {"storageclass.kubernetes.io/is-default-class": "true"}}}'

Verify as follows,

oc get sc

Output:

NAME                                    PROVISIONER                             RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-vs                                kubernetes.io/no-provisioner            Delete          WaitForFirstConsumer   false                  74m
ocs-storagecluster-ceph-rbd (default)   openshift-storage.rbd.csi.ceph.com      Delete          Immediate              true                   65m
ocs-storagecluster-ceph-rgw             openshift-storage.ceph.rook.io/bucket   Delete          Immediate              false                  72m
ocs-storagecluster-cephfs               openshift-storage.cephfs.csi.ceph.com   Delete          Immediate              true                   65m
openshift-storage.noobaa.io             openshift-storage.noobaa.io/obc         Delete          Immediate              false                  62m