New playbooks for k8s service and examples

- kubedns moved to playbooks dir
- new ansible playbooks added for kubedash and kube-dashboard
- examples for k8s deployments and services added

examples/kubernetes/external-nginx/README.md

@@ -0,0 +1,18 @@
+Nginx example with external IPs
+===============================
+
+* Edit `nginx-frontend.yaml` and update `externalIPs` to the list of external IPs of your k8s minions
+
+* Deploy:
+
+```bash
+kubectl create -f nginx-backends.yaml
+kubectl create -f nginx-frontend.yaml
+```
+
+* Check:
+
+```bash
+curl $ANY_MINION_EXTERNAL_IP
+```
+

examples/kubernetes/external-nginx/nginx-backends.yaml

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+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: nginx-backend
+spec:
+  replicas: 3
+  template:
+    metadata:
+      labels:
+        app: nginx-backend
+        tier: backend
+    spec:
+      containers:
+      - name: nginx
+        image: nginx
+        resources:
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        env:
+        - name: GET_HOSTS_FROM
+          value: dns
+        ports:
+        - containerPort: 80

examples/kubernetes/external-nginx/nginx-frontend.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-frontend
+  labels:
+    app: nginx-frontend
+    tier: frontend
+spec:
+  externalIPs:
+  - 10.210.0.12
+  - 10.210.0.13
+  - 10.210.0.14
+  - 10.210.0.15
+  - 10.210.0.16
+  - 10.210.0.17
+  ports:
+  - name: http
+    port: 80
+    protocol: TCP
+    targetPort: 80
+  selector:
+    app: nginx-backend