Merge pull request #326 from chentao1596/daemonset

add nginx daemonset example

examples/daemonset/nginx/README.md

@@ -0,0 +1,40 @@
+# Nginx Ingress DaemonSet
+
+In some cases, the Ingress controller will be required to be run at all the nodes in cluster. Using [DaemonSet](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/daemon.md) can achieve this requirement.
+
+## 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   192.168.3.6   <none>        80/TCP    1h
+
+$ kubectl -n kube-system get po
+NAME                                    READY     STATUS    RESTARTS   AGE
+default-http-backend-2657704409-6b47n   1/1       Running   0          1h
+```
+
+## Ingress DaemonSet
+
+Deploy the daemonset as follows:
+
+```console
+$ kubectl apply -f nginx-ingress-daemonset.yaml
+daemonset "nginx-ingress-lb" created
+
+$ kubectl -n kube-system get ds
+NAME               DESIRED   CURRENT   READY     NODE-SELECTOR   AGE
+nginx-ingress-lb   2         2         2         <none>          21s
+
+$ kubectl -n kube-system get po
+NAME                                    READY     STATUS    RESTARTS   AGE
+default-http-backend-2657704409-6b47n   1/1       Running   0          2h
+nginx-ingress-lb-8381i                  1/1       Running   0          56s
+nginx-ingress-lb-h54gf                  1/1       Running   0          56s
+```

examples/daemonset/nginx/nginx-ingress-daemonset.yaml

@@ -0,0 +1,47 @@
+apiVersion: extensions/v1beta1
+kind: DaemonSet
+metadata:
+  name: nginx-ingress-lb
+  labels:
+    name: nginx-ingress-lb
+  namespace: kube-system
+spec:
+  template:
+    metadata:
+      labels:
+        name: nginx-ingress-lb
+    spec:
+      terminationGracePeriodSeconds: 60
+      containers:
+      - image: gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.2
+        name: nginx-ingress-lb
+        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
+