Update kube-jupyterhub.md

kube-jupyterhub.md

@@ -34,7 +34,21 @@ version.BuildInfo{Version:"v3.5.0", GitCommit:"32c22239423b3b4ba6706d450bd044baf
 ### cinder volume
 The creation of volumes required by a kubertenes app can achieved
 if csi-cinder-controllerplugin + csi-cinder-nodeplugin pods are running
-and if a dedicated storage class is created `storageclass.yaml`
+and if a default storage class is created `storageclass.yaml`
+```bash
+kubectl apply -f sc-default.yaml
+    storageclass.storage.k8s.io/csi-sc-cinderplugin created
+kubectl get storageclass
+NAME                                   PROVISIONER                RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
+csi-sc-cinderplugin                    cinder.csi.openstack.org   Delete          Immediate           false                  62s
+csi-sc-cinderplugin-dirty1 (default)   cinder.csi.openstack.org   Delete          Immediate           false                  24h
+kubectl patch storageclass csi-sc-cinderplugin -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
+    storageclass.storage.k8s.io/csi-sc-cinderplugin patched
+kubectl get storageclass
+NAME                                   PROVISIONER                RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
+csi-sc-cinderplugin (default)          cinder.csi.openstack.org   Delete          Immediate           false                  99s
+csi-sc-cinderplugin-dirty1 (default)   cinder.csi.openstack.org   Delete          Immediate           false                  24h
+```
 
 ### volume node affinity conflict
 ```bash