Update port-forwarding docs (#7575)

Author: islinwb

docs/tasks/access-application-cluster/port-forward-access-application-cluster.md

@@ -22,53 +22,93 @@ for database debugging.
 
 {% capture steps %}
 
-## Creating a pod to run a Redis server
+## Creating Redis deployment and service
 
-1. Create a pod:
+1. Create a Redis deployment:
 
-       kubectl create -f https://k8s.io/docs/tasks/access-application-cluster/redis-master.yaml
+       kubectl create -f https://k8s.io/docs/tutorials/stateless-application/guestbook/redis-master-deployment.yaml
 
-    The output of a successful command verifies that the pod was created:
+    The output of a successful command verifies that the deployment was created:
 
-        pod "redis-master" created
+        deployment "redis-master" created
+ 
+    When the pod is ready, you can get:
+       
+       kubectl get pods
 
-1. Check to see whether the pod is running and ready:
+        NAME                            READY     STATUS    RESTARTS   AGE
+        redis-master-765d459796-258hz   1/1       Running   0          50s
 
-       kubectl get pods
+       kubectl get deployment
+       
+        NAME         DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
+        redis-master 1         1         1            1           55s
+
+       kubectl get rs
+        NAME                      DESIRED   CURRENT   READY     AGE
+        redis-master-765d459796   1         1         1         1m
+
+
+2. Create a Redis service:
+
+       kubectl create -f https://k8s.io/docs/tutorials/stateless-application/guestbook/redis-master-service.yaml
+
+    The output of a successful command verifies that the service was created:
+
+        service "redis-master" created
+
+    Check the service created:
 
-    When the pod is ready, the output displays a STATUS of Running:
+       kubectl get svc | grep redis
 
-        NAME           READY     STATUS    RESTARTS   AGE
-        redis-master   2/2       Running   0          41s
+        NAME           TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)    AGE
+        redis-master   ClusterIP   10.0.0.213   <none>        6379/TCP   27s
 
-1. Verify that the Redis server is running in the pod and listening on port 6379:
+3. Verify that the Redis server is running in the pod and listening on port 6379:
 
         {% raw %}
-       kubectl get pods redis-master --template='{{(index (index .spec.containers 0).ports 0).containerPort}}{{"\n"}}'
+       kubectl get pods redis-master-765d459796-258hz --template='{{(index (index .spec.containers 0).ports 0).containerPort}}{{"\n"}}'
         {% endraw %}
 
     The output displays the port:
 
         6379
 
+
 ## Forward a local port to a port on the pod
 
-1. Forward port 6379 on the local workstation to port 6379 of redis-master pod:
+1.  `kubectl port-forward` allows using resource name, such as a service name, to select a matching pod to port forward to since Kubernetes v1.10.
+
+        kubectl port-forward redis-master-765d459796-258hz 6379:6379 
+
+    which is the same as
+
+        kubectl port-forward pods/redis-master-765d459796-258hz 6379:6379
+
+    or  
+
+        kubectl port-forward deployment/redis-master 6379:6379 
+
+    or
+
+        kubectl port-forward rs/redis-master 6379:6379 
+
+    or
 
-       kubectl port-forward redis-master 6379:6379
+        kubectl port-forward svc/redis-master 6379:6379
 
-    The output is similar to this:
+    Any of the above commands works. The output is similar to this:
 
         I0710 14:43:38.274550    3655 portforward.go:225] Forwarding from 127.0.0.1:6379 -> 6379
         I0710 14:43:38.274797    3655 portforward.go:225] Forwarding from [::1]:6379 -> 6379
 
-1. Start the Redis command line interface:
+2.  Start the Redis command line interface:
 
-       redis-cli
+        redis-cli
 
-1. At the Redis command line prompt, enter the `ping` command:
+3.  At the Redis command line prompt, enter the `ping` command:
 
-       127.0.0.1:6379>ping
+        127.0.0.1:6379>ping
 
     A successful ping request returns PONG.