README.md: fix and clarify examples

The previous `kubectl create -f examples` no longer worked as intended
after adding several more example yamls, in particular because
csi-app-inline.yaml reused the pod name.

When selecting files explicitly, the previous example works again as
before. The pod name in csi-app-inline.yaml gets changed such that it
can be used in parallel.

This approach was chosen instead of moving files into sub-directories
because csi-storageclass.yaml is needed by more than one example. When
using "kubectl apply" instead of "kubectl create" we
could (theoretically) re-use files in different examples without
causing errors. In practice, the raw block example is currently not
explicitly called out in the README.md.

The snapshotting example however can't be used stand-alone and depends
on the simple PVC.

Author: pohly

README.md

@@ -82,7 +82,7 @@ csi-hostpathplugin-0         2/2     Running   0          5m45s
 From the root directory, deploy the application pods including a storage class, a PVC, and a pod which mounts a volume using the Hostpath driver found in directory `./examples`:
 
 ```shell
-$ kubectl create -f ./examples
+$ for i in ./examples/csi-storageclass.yaml ./examples/csi-pvc.yaml ./examples/csi-app.yaml; do kubectl apply -f $i; done
 pod/my-csi-app created
 persistentvolumeclaim/csi-pvc created
 storageclass.storage.k8s.io/csi-hostpath-sc created
@@ -234,9 +234,10 @@ Since volume snapshot is an alpha feature starting in Kubernetes v1.12, you need
 > Events:                <none>
 > ```
 
-Use the volume snapshot class to dynamically create a volume snapshot:
+After having created the `csi-pvc` as described in the example above,
+use the volume snapshot class to dynamically create a volume snapshot:
 
-> $ kubectl create -f examples/csi-snapshot.yaml
+> $ kubectl apply -f examples/csi-snapshot.yaml
 > ```
 > volumesnapshot.snapshot.storage.k8s.io/new-snapshot-demo created
 > ```
@@ -324,7 +325,7 @@ Use the volume snapshot class to dynamically create a volume snapshot:
 
 Follow the following example to create a volume from a volume snapshot:
 
-> $ kubectl create -f examples/csi-restore.yaml
+> $ kubectl apply -f examples/csi-restore.yaml
 > `persistentvolumeclaim/hpvc-restore created`
 >
 > $ kubectl get pvc

examples/csi-app-inline.yaml

@@ -1,7 +1,7 @@
 kind: Pod
 apiVersion: v1
 metadata:
-  name: my-csi-app
+  name: my-csi-app-inline
 spec:
   containers:
     - name: my-frontend