Fix issues in configure-volume-storage

* ps command not found
* wrong code format

Signed-off-by: Jamie Zhuang <lanchongyizu@gmail.com>

content/en/docs/tasks/configure-pod-container/configure-volume-storage.md

@@ -37,51 +37,53 @@ restarts. Here is the configuration file for the Pod:
 
 1. Create the Pod:
 
-       kubectl create -f https://k8s.io/examples/pods/storage/redis.yaml
+        kubectl create -f https://k8s.io/examples/pods/storage/redis.yaml
 
 1. Verify that the Pod's Container is running, and then watch for changes to
 the Pod:
 
-       kubectl get pod redis --watch
+        kubectl get pod redis --watch
 
     The output looks like this:
 
-       NAME      READY     STATUS    RESTARTS   AGE
-       redis     1/1       Running   0          13s
+        NAME      READY     STATUS    RESTARTS   AGE
+        redis     1/1       Running   0          13s
 
 1. In another terminal, get a shell to the running Container:
 
-       kubectl exec -it redis -- /bin/bash
+        kubectl exec -it redis -- /bin/bash
 
 1. In your shell, go to `/data/redis`, and create a file:
 
-       root@redis:/data# cd /data/redis/
-       root@redis:/data/redis# echo Hello > test-file
+        root@redis:/data# cd /data/redis/
+        root@redis:/data/redis# echo Hello > test-file
 
 1. In your shell, list the running processes:
 
-       root@redis:/data/redis# ps aux
+        root@redis:/data/redis# apt-get update
+        root@redis:/data/redis# apt-get install procps
+        root@redis:/data/redis# ps aux
 
     The output is similar to this:
 
-       USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
-       redis        1  0.1  0.1  33308  3828 ?        Ssl  00:46   0:00 redis-server *:6379
-       root        12  0.0  0.0  20228  3020 ?        Ss   00:47   0:00 /bin/bash
-       root        15  0.0  0.0  17500  2072 ?        R+   00:48   0:00 ps aux
+        USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
+        redis        1  0.1  0.1  33308  3828 ?        Ssl  00:46   0:00 redis-server *:6379
+        root        12  0.0  0.0  20228  3020 ?        Ss   00:47   0:00 /bin/bash
+        root        15  0.0  0.0  17500  2072 ?        R+   00:48   0:00 ps aux
 
 1. In your shell, kill the redis process:
 
-       root@redis:/data/redis# kill <pid>
+        root@redis:/data/redis# kill <pid>
 
     where `<pid>` is the redis process ID (PID).
 
 1. In your original terminal, watch for changes to the redis Pod. Eventually,
 you will see something like this:
 
-       NAME      READY     STATUS     RESTARTS   AGE
-       redis     1/1       Running    0          13s
-       redis     0/1       Completed  0         6m
-       redis     1/1       Running    1         6m
+        NAME      READY     STATUS     RESTARTS   AGE
+        redis     1/1       Running    0          13s
+        redis     0/1       Completed  0         6m
+        redis     1/1       Running    1         6m
 
 At this point, the Container has terminated and restarted. This is because the
 redis Pod has a
@@ -90,7 +92,7 @@ of `Always`.
 
 1. Get a shell into the restarted Container:
 
-       kubectl exec -it redis -- /bin/bash
+        kubectl exec -it redis -- /bin/bash
 
 1. In your shell, goto `/data/redis`, and verify that `test-file` is still there.