Verifying a default StorageClass

Some operations, such as deploying a remote (SSH-based) cluster, require the management cluster to have a default StorageClass. Follow these steps:

1. If not already installed, install and configure a StorageClass provider of your choice.

2. Make sure you see the default setting:

   kubectl get storageclass
   

   You should see a result such as:

   NAME                         PROVISIONER               RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
   mayastor-etcd-localpv        openebs.io/local          Delete          WaitForFirstConsumer   false                  2m2s
   openebs-hostpath (default)   openebs.io/local          Delete          WaitForFirstConsumer   false                  2m2s
   openebs-loki-localpv         openebs.io/local          Delete          WaitForFirstConsumer   false                  2m2s
   openebs-minio-localpv        openebs.io/local          Delete          WaitForFirstConsumer   false                  2m2s
   openebs-single-replica       io.openebs.csi-mayastor   Delete          Immediate              true                   2m2s
   

3. Create a test PVC:

   cat <<'EOF' | kubectl apply -f -
   apiVersion: v1
   kind: PersistentVolumeClaim
   metadata:
     name: test-pvc
   spec:
     accessModes:
       - ReadWriteOnce
     resources:
       requests:
         storage: 1Gi
   EOF
   

4. Create a test pod:

   cat <<'EOF' | kubectl apply -f -
   apiVersion: v1
   kind: Pod
   metadata:
     name: test-pvc-pod
   spec:
     containers:
       - name: test
         image: busybox
         command: ["sh", "-c", "echo hello > /data/test.txt && sleep 3600"]
         volumeMounts:
           - name: data
             mountPath: /data
     volumes:
       - name: data
         persistentVolumeClaim:
           claimName: test-pvc
   EOF
   

5. Check the results:

   kubectl get pod test-pvc-pod
   kubectl get pvc test-pvc
   

   NAME           READY   STATUS    RESTARTS   AGE
   test-pvc-pod   1/1     Running   0          20s
   
   NAME       STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS       VOLUMEATTRIBUTESCLASS   AGE
   test-pvc   Bound    pvc-61b4dd8b-9bcc-48e3-9055-9f0f80ea9abd   1Gi        RWO            openebs-hostpath   <unset>                 36s
   

   You should see the PVC become Bound.

6. Finally, clean up the test:

   kubectl delete pod test-pvc-pod
   kubectl delete pvc test-pvc