add example of 'run multiple nginx ingress controllers as a deployment'

examples/scaling-deployment/nginx/README.md

@@ -0,0 +1,41 @@
+# Deploying multi Nginx Ingress Controllers
+
+This example aims to demonstrate the Deployment of multi nginx ingress controllers.
+
+## Default Backend
+
+The default backend is a service of handling all url paths and hosts the nginx controller doesn't understand. Deploy the default-http-backend as follow:
+
+```console
+$ kubectl apply -f ../../deployment/nginx/default-backend.yaml 
+deployment "default-http-backend" configured
+service "default-http-backend" configured
+
+$ kubectl -n kube-system get svc
+NAME                   CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
+default-http-backend   192.168.3.52   <none>        80/TCP    6m
+
+$ kubectl -n kube-system get po
+NAME                                    READY     STATUS    RESTARTS   AGE
+default-http-backend-2657704409-wz6o3   1/1       Running   0          6m
+```
+
+## Ingress Deployment
+
+Deploy the Deployment of multi controllers as follows:
+
+```console
+$ kubectl apply -f nginx-ingress-deployment.yaml
+deployment "nginx-ingress-controller" created
+
+$ kubectl -n kube-system get deployment
+NAME                       DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
+default-http-backend       1         1         1            1           16m
+nginx-ingress-controller   2         2         2            2           24s
+
+$ kubectl -n kube-system get po
+NAME                                        READY     STATUS    RESTARTS   AGE
+default-http-backend-2657704409-wz6o3       1/1       Running   0          16m
+nginx-ingress-controller-3752011415-0qbi6   1/1       Running   0          39s
+nginx-ingress-controller-3752011415-vi8fq   1/1       Running   0          39s
+```

examples/scaling-deployment/nginx/nginx-ingress-deployment.yaml

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+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: nginx-ingress-controller
+  labels:
+    k8s-app: nginx-ingress-controller
+  namespace: kube-system
+spec:
+  replicas: 2
+  template:
+    metadata:
+      labels:
+        k8s-app: nginx-ingress-controller
+    spec:
+      terminationGracePeriodSeconds: 60
+      containers:
+      - image: gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.2
+        name: nginx-ingress-controller
+        readinessProbe:
+          httpGet:
+            path: /healthz
+            port: 10254
+            scheme: HTTP
+        livenessProbe:
+          httpGet:
+            path: /healthz
+            port: 10254
+            scheme: HTTP
+          initialDelaySeconds: 10
+          timeoutSeconds: 1
+        ports:
+        - containerPort: 80
+          hostPort: 80
+        - containerPort: 443
+          hostPort: 443
+        env:
+          - name: POD_NAME
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.name
+          - name: POD_NAMESPACE
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.namespace
+        args:
+        - /nginx-ingress-controller
+        - --default-backend-service=$(POD_NAMESPACE)/default-http-backend