一键建立zookeeper集群

使用yaml文件的好处，通过service name来进行pod间的服务发现，

集群配置dns.

[root@k8s-master ~]# cat zookeeper-cluster.yaml 
apiVersion: extensions/v1beta1
kind: Deployment 
metadata: 
  name: zookeeper-1
spec: 
  replicas: 1
  template: 
    metadata: 
      labels: 
        name: zookeeper-1 
    spec: 
      containers: 
        - name: zookeeper-1
          image: docker.io/zookeeper:3.4.11
          imagePullPolicy: IfNotPresent
          env:
          - name: ZOO_MY_ID
            value: "1"
          - name: ZOO_SERVERS
            value: "server.1=0.0.0.0:2888:3888 server.2=zookeeper-2:2888:3888 server.3=zookeeper-3:2888:3888"
          ports:
          - containerPort: 2181

---

apiVersion: extensions/v1beta1 
kind: Deployment
metadata:
  name: zookeeper-2
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: zookeeper-2
    spec:
      containers:
        - name: zookeeper-2
          image: docker.io/zookeeper:3.4.11
          imagePullPolicy: IfNotPresent
          env:
          - name: ZOO_MY_ID
            value: "2"
          - name: ZOO_SERVERS
            value: "server.1=zookeeper-1:2888:3888 server.2=0.0.0.0:2888:3888 server.3=zookeeper-3:2888:3888"
          ports:
          - containerPort: 2181

---

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: zookeeper-3
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: zookeeper-3
    spec:
      containers:
        - name: zookeeper-3
          image: docker.io/zookeeper:3.4.11
          imagePullPolicy: IfNotPresent
          env:
          env:
          - name: ZOO_MY_ID
            value: "3"
          - name: ZOO_SERVERS
            value: "server.1=zookeeper-1:2888:3888 server.2=zookeeper-2:2888:3888 server.3=0.0.0.0:2888:3888"
          ports:
          - containerPort: 2181
---

apiVersion: v1 
kind: Service 
metadata: 
  name: zookeeper-1 
  labels:
    name: zookeeper-1
spec: 
  ports: 
    - name: client
      port: 2181
      protocol: TCP
    - name: followers
      port: 2888
      protocol: TCP
    - name: election
      port: 3888
      protocol: TCP
  selector: 
    name: zookeeper-1

---

apiVersion: v1 
kind: Service 
metadata: 
  name: zookeeper-2
  labels:
    name: zookeeper-2
spec: 
  ports: 
    - name: client
      port: 2181
      protocol: TCP
    - name: followers
      port: 2888
      protocol: TCP
    - name: election
      port: 3888
      protocol: TCP
  selector: 
    name: zookeeper-2

---

apiVersion: v1 
kind: Service 
metadata: 
  name: zookeeper-3
  labels:
    name: zookeeper-3
spec: 
  ports: 
    - name: client
      port: 2181
      protocol: TCP
    - name: followers
      port: 2888
      protocol: TCP
    - name: election
      port: 3888
      protocol: TCP
  selector: 
    name: zookeeper-3