Add TCP socket health check example (#3977)

* Add TCP socket health check example

* Add test case for pod-with-tcp-socket-healthcheck

docs/user-guide/walkthrough/k8s201.md

@@ -216,6 +216,9 @@ Here is an example config for a Pod with an HTTP health check ([pod-with-http-he
 
 {% include code.html language="yaml" file="pod-with-http-healthcheck.yaml" ghlink="/docs/user-guide/walkthrough/pod-with-http-healthcheck.yaml" %}
 
+And here is an example config for a Pod with a TCP Socket health check ([pod-with-tcp-socket-healthcheck.yaml](/docs/user-guide/walkthrough/pod-with-tcp-socket-healthcheck.yaml)):
+
+{% include code.html language="yaml" file="pod-with-tcp-socket-healthcheck.yaml" ghlink="/docs/user-guide/walkthrough/pod-with-tcp-socket-healthcheck.yaml" %}
 
 For more information about health checking, see [Container Probes](/docs/user-guide/pod-states/#container-probes).
 

docs/user-guide/walkthrough/pod-with-http-healthcheck.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 kind: Pod
 metadata:
-  name: pod-with-healthcheck
+  name: pod-with-http-healthcheck
 spec:
   containers:
   - name: nginx

docs/user-guide/walkthrough/pod-with-tcp-socket-healthcheck.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: pod-with-tcp-socket-healthcheck
+spec:
+  containers:
+  - name: redis
+    image: redis
+    # defines the health checking
+    livenessProbe:
+      # a TCP socket probe
+      tcpSocket:
+        port: 6379
+      # length of time to wait for a pod to initialize
+      # after pod startup, before applying health checking
+      initialDelaySeconds: 30
+      timeoutSeconds: 1
+    ports:
+    - containerPort: 6379

test/examples_test.go

@@ -215,14 +215,15 @@ func walkConfigFiles(inDir string, fn func(name, path string, data [][]byte)) er
 func TestExampleObjectSchemas(t *testing.T) {
 	cases := map[string]map[string][]runtime.Object{
 		"../docs/user-guide/walkthrough": {
-			"deployment":                {&extensions.Deployment{}},
-			"deployment-update":         {&extensions.Deployment{}},
-			"pod-nginx":                 {&api.Pod{}},
-			"pod-nginx-with-label":      {&api.Pod{}},
-			"pod-redis":                 {&api.Pod{}},
-			"pod-with-http-healthcheck": {&api.Pod{}},
-			"podtemplate":               {&api.PodTemplate{}},
-			"service":                   {&api.Service{}},
+			"deployment":				{&extensions.Deployment{}},
+			"deployment-update":			{&extensions.Deployment{}},
+			"pod-nginx":				{&api.Pod{}},
+			"pod-nginx-with-label":			{&api.Pod{}},
+			"pod-redis":				{&api.Pod{}},
+			"pod-with-http-healthcheck":		{&api.Pod{}},
+			"pod-with-tcp-socket-healthcheck": 	{&api.Pod{}},
+			"podtemplate":				{&api.PodTemplate{}},
+			"service":				{&api.Service{}},
 		},
 		"../docs/user-guide/update-demo": {
 			"kitten-rc":   {&api.ReplicationController{}},