add etcd on k8s example

hack/kubernetes-deploy/README.md

@@ -0,0 +1,21 @@
+# etcd on Kubernetes
+
+This is an example setting up etcd as a set of pods and services running on top of kubernetes. Using:
+
+```
+$ kubectl create -f etcd.yml 
+services/etcd-client
+pods/etcd0
+services/etcd0
+pods/etcd1
+services/etcd1
+pods/etcd2
+services/etcd2
+$ # now deploy a service that consumes etcd, such as vulcand
+$ kubectl create -f vulcand.yml
+```
+
+TODO:
+
+- create a replication controller like service that knows how to add and remove nodes from the cluster correctly
+- use kubernetes secrets API to configure TLS for etcd clients and peers

hack/kubernetes-deploy/etcd.yml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: etcd-client
+spec:
+  ports:
+  - name: etcd-client-port
+    port: 2379
+    protocol: TCP
+    targetPort: 2379
+  selector:
+    app: etcd
+
+---
+
+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    app: etcd
+    etcd_node: etcd0
+  name: etcd0
+spec:
+  containers:
+  - command:
+    - /etcd
+    - -name
+    - etcd0
+    - -initial-advertise-peer-urls
+    - http://etcd0:2380
+    - -listen-peer-urls
+    - http://0.0.0.0:2380
+    - -listen-client-urls
+    - http://0.0.0.0:2379
+    - -advertise-client-urls
+    - http://etcd0:2379
+    - -initial-cluster
+    - etcd0=http://etcd0:2380,etcd1=http://etcd1:2380,etcd2=http://etcd2:2380
+    - -initial-cluster-state
+    - new
+    image: quay.io/coreos/etcd:latest
+    name: etcd0
+    ports:
+    - containerPort: 2379
+      name: client
+      protocol: TCP
+    - containerPort: 2380
+      name: server
+      protocol: TCP
+  restartPolicy: Never
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    etcd_node: etcd0
+  name: etcd0
+spec:
+  ports:
+  - name: client
+    port: 2379
+    protocol: TCP
+    targetPort: 2379
+  - name: server
+    port: 2380
+    protocol: TCP
+    targetPort: 2380
+  selector:
+    etcd_node: etcd0
+
+---
+
+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    app: etcd
+    etcd_node: etcd1
+  name: etcd1
+spec:
+  containers:
+  - command:
+    - /etcd
+    - -name
+    - etcd1
+    - -initial-advertise-peer-urls
+    - http://etcd1:2380
+    - -listen-peer-urls
+    - http://0.0.0.0:2380
+    - -listen-client-urls
+    - http://0.0.0.0:2379
+    - -advertise-client-urls
+    - http://etcd1:2379
+    - -initial-cluster
+    - etcd0=http://etcd0:2380,etcd1=http://etcd1:2380,etcd2=http://etcd2:2380
+    - -initial-cluster-state
+    - new
+    image: quay.io/coreos/etcd:latest
+    name: etcd1
+    ports:
+    - containerPort: 2379
+      name: client
+      protocol: TCP
+    - containerPort: 2380
+      name: server
+      protocol: TCP
+  restartPolicy: Never
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    etcd_node: etcd1
+  name: etcd1
+spec:
+  ports:
+  - name: client
+    port: 2379
+    protocol: TCP
+    targetPort: 2379
+  - name: server
+    port: 2380
+    protocol: TCP
+    targetPort: 2380
+  selector:
+    etcd_node: etcd1
+
+---
+
+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    app: etcd
+    etcd_node: etcd2
+  name: etcd2
+spec:
+  containers:
+  - command:
+    - /etcd
+    - -name
+    - etcd2
+    - -initial-advertise-peer-urls
+    - http://etcd2:2380
+    - -listen-peer-urls
+    - http://0.0.0.0:2380
+    - -listen-client-urls
+    - http://0.0.0.0:2379
+    - -advertise-client-urls
+    - http://etcd2:2379
+    - -initial-cluster
+    - etcd0=http://etcd0:2380,etcd1=http://etcd1:2380,etcd2=http://etcd2:2380
+    - -initial-cluster-state
+    - new
+    image: quay.io/coreos/etcd:latest
+    name: etcd2
+    ports:
+    - containerPort: 2379
+      name: client
+      protocol: TCP
+    - containerPort: 2380
+      name: server
+      protocol: TCP
+  restartPolicy: Never
+
+---
+
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    etcd_node: etcd2
+  name: etcd2
+spec:
+  ports:
+  - name: client
+    port: 2379
+    protocol: TCP
+    targetPort: 2379
+  - name: server
+    port: 2380
+    protocol: TCP
+    targetPort: 2380
+  selector:
+    etcd_node: etcd2

hack/kubernetes-deploy/vulcand.yml

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+apiVersion: v1
+kind: Pod
+metadata:
+  labels:
+    app: vulcand
+  name: vulcand
+spec:
+  containers:
+  - command:
+    - /go/bin/vulcand
+    - -apiInterface=0.0.0.0
+    - --etcd=http://etcd-client:2379
+    image: mailgun/vulcand:v0.8.0-beta.2
+    name: vulcand
+    ports:
+    - containerPort: 8081
+      name: api
+      protocol: TCP
+    - containerPort: 8082
+      name: server
+      protocol: TCP
+  restartPolicy: Always