[hi] add example service

content/hi/examples/service/explore-graceful-termination-nginx.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-service
+spec:
+  selector:
+    app: nginx
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 80

content/hi/examples/service/load-balancer-example.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app.kubernetes.io/name: load-balancer-example
+  name: hello-world
+spec:
+  replicas: 5
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: load-balancer-example
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: load-balancer-example
+    spec:
+      containers:
+      - image: gcr.io/google-samples/hello-app:2.0
+        name: hello-world
+        ports:
+        - containerPort: 8080

content/hi/examples/service/nginx-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-service
+spec:
+  ports:
+  - port: 8000 # the port that this service should serve on
+    # the container on each pod to connect to, can be a name
+    # (e.g. 'www') or a number (e.g. 80)
+    targetPort: 80
+    protocol: TCP
+  # just like the selector in the deployment,
+  # but this time it identifies the set of pods to load balance
+  # traffic to.
+  selector:
+    app: nginx

content/hi/examples/service/pod-with-graceful-termination.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  labels:
+    app: nginx
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      terminationGracePeriodSeconds: 120 # extra long grace period
+      containers:
+      - name: nginx
+        image: nginx:latest
+        ports:
+        - containerPort: 80
+        lifecycle:
+          preStop:
+            exec:
+              # Real life termination may take any time up to terminationGracePeriodSeconds.
+              # In this example - just hang around for at least the duration of terminationGracePeriodSeconds,
+              # at 120 seconds container will be forcibly terminated.
+              # Note, all this time nginx will keep processing requests.
+              command: [
+                "/bin/sh", "-c", "sleep 180"
+              ]

content/hi/examples/service/simple-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: my-service
+spec:
+  selector:
+    app.kubernetes.io/name: MyApp
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 9376