update pod persistent volume example storage class (#3979)

* update pod persistent volume example storage class

When binding to a manually created PersistentVolume, the claim must
disable dynamic provisioning by specifying an empty storage class.

Fixes #2803

* use specific storageclass

* revert gibibytes -> gigabytes change

docs/tasks/configure-pod-container/configure-persistent-volume-storage.md

@@ -68,7 +68,9 @@ Here is the configuration file for the hostPath PersistentVolume:
 The configuration file specifies that the volume is at `/tmp/data` on the
 the cluster's Node. The configuration also specifies a size of 10 gibibytes and
 an access mode of `ReadWriteOnce`, which means the volume can be mounted as
-read-write by a single Node.
+read-write by a single Node. It defines the [StorageClass name](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#class)
+`manual` for the PersistentVolume, which will be used to bind
+PersistentVolumeClaim requests to this PersistentVolume.
 
 Create the PersistentVolume:
 
@@ -81,9 +83,8 @@ View information about the PersistentVolume:
 The output shows that the PersistentVolume has a `STATUS` of `Available`. This
 means it has not yet been bound to a PersistentVolumeClaim.
 
-    NAME             CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS      CLAIM     REASON    AGE
+    NAME             CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS      CLAIM     STORAGECLASS   REASON    AGE
-    task-pv-volume   10Gi       RWO           Retain          Available                       17s
+    task-pv-volume   10Gi       RWO           Retain          Available             manual                   4s
-
 
 ## Create a PersistentVolumeClaim
 
@@ -102,7 +103,8 @@ Create the PersistentVolumeClaim:
 
 After you create the PersistentVolumeClaim, the Kubernetes control plane looks
 for a PersistentVolume that satisfies the claim's requirements. If the control
-plane finds a suitable PersistentVolume, it binds the claim to the volume.
+plane finds a suitable PersistentVolume with the same StorageClass, it binds the
+claim to the volume.
 
 Look again at the PersistentVolume:
 
@@ -110,9 +112,8 @@ Look again at the PersistentVolume:
 
 Now the output shows a `STATUS` of `Bound`.
 
-    kubectl get pv task-pv-volume
+    NAME             CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS    CLAIM                   STORAGECLASS   REASON    AGE
-    NAME             CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS    CLAIM                   REASON    AGE
+    task-pv-volume   10Gi       RWO           Retain          Bound     default/task-pv-claim   manual                   2m
-    task-pv-volume   10Gi       RWO           Retain          Bound     default/task-pv-claim             8m
 
 Look at the PersistentVolumeClaim:
 
@@ -121,8 +122,8 @@ Look at the PersistentVolumeClaim:
 The output shows that the PersistentVolumeClaim is bound to your PersistentVolume,
 `task-pv-volume`.
 
-    NAME            STATUS    VOLUME           CAPACITY   ACCESSMODES   AGE
+    NAME            STATUS    VOLUME           CAPACITY   ACCESSMODES   STORAGECLASS   AGE
-    task-pv-claim   Bound     task-pv-volume   10Gi       RWO           5s
+    task-pv-claim   Bound     task-pv-volume   10Gi       RWO           manual         30s
 
 ## Create a Pod
 

docs/tasks/configure-pod-container/task-pv-claim.yaml

@@ -3,6 +3,7 @@ apiVersion: v1
 metadata:
   name: task-pv-claim
 spec:
+  storageClassName: manual
   accessModes:
     - ReadWriteOnce
   resources:

docs/tasks/configure-pod-container/task-pv-volume.yaml

@@ -5,6 +5,7 @@ metadata:
   labels:
     type: local
 spec:
+  storageClassName: manual
   capacity:
     storage: 10Gi
   accessModes: