Kubernetes集群中部署ZooKeeper集群

Kubernetes集群中部署ZooKeeper集群有两种方式，一是基于kubernetes的镜像kubernetes-zookeeper，另外一种是基于原生的镜像zookeeper，基于kubernetes-zookeeper的部署可以参考kubernetes官网文档 https://kubernetes.io/docs/tutorials/stateful-application/zookeeper/ ，阿汤博客今天主要介绍下基于原生镜像的部署，直接查看zookeeper.yml配置文件（未配置数据持久化）。

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: zoo1
  namespace: zyts
spec:
  selector:
    matchLabels:
      app: zoo1
  serviceName: zoo1-service
  replicas: 1
  template:
    metadata:
      labels:
        app: zoo1
    spec:
      restartPolicy: Always
      containers:
      - name: zoo1
        image: zookeeper:3.4.14
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 2181
        - containerPort: 2888
        - containerPort: 3888
          protocol: TCP
        resources:
          limits:
            cpu: 1000m
          requests:
            cpu: 100m
        env:
        - name: ZOO_MY_ID
          value: "1"
        - name: ZOO_SERVERS
          value: server.1=zoo1-0.zoo1-service.zyts.svc.cluster.local:2888:3888 server.2=zoo2-0.zoo2-service.zyts.svc.cluster.local:2888:3888 server.3=zoo3-0.zoo3-service.zyts.svc.cluster.local:2888:3888
---          
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: zoo2
  namespace: zyts
spec:
  selector:
    matchLabels:
      app: zoo2
  serviceName: zoo2-service
  replicas: 1
  template:
    metadata:
      labels:
        app: zoo2
    spec:
      restartPolicy: Always
      containers:
      - name: zoo2
        image: zookeeper:3.4.14
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 2181
        - containerPort: 2888
        - containerPort: 3888
          protocol: TCP
        resources:
          limits:
            cpu: 1000m
          requests:
            cpu: 100m
        env:
        - name: ZOO_MY_ID
          value: "2"
        - name: ZOO_SERVERS
          value: server.1=zoo1-0.zoo1-service.zyts.svc.cluster.local:2888:3888 server.2=zoo2-0.zoo2-service.zyts.svc.cluster.local:2888:3888 server.3=zoo3-0.zoo3-service.zyts.svc.cluster.local:2888:3888 
---          
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: zoo3
  namespace: zyts
spec:
  selector:
    matchLabels:
      app: zoo3
  serviceName: zoo3-service
  replicas: 1
  template:
    metadata:
      labels:
        app: zoo3
    spec:
      restartPolicy: Always
      containers:
      - name: zoo3
        image: zookeeper:3.4.14
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 2181
        - containerPort: 2888
        - containerPort: 3888
          protocol: TCP
        resources:
          limits:
            cpu: 1000m
          requests:
            cpu: 100m
        env:
        - name: ZOO_MY_ID
          value: "3"
        - name: ZOO_SERVERS
          value: server.1=zoo1-0.zoo1-service.zyts.svc.cluster.local:2888:3888 server.2=zoo2-0.zoo2-service.zyts.svc.cluster.local:2888:3888 server.3=zoo3-0.zoo3-service.zyts.svc.cluster.local:2888:3888
---
apiVersion: v1
kind: Service
metadata:
  name: zoo1-service
  namespace: zyts
spec:
  ports:
  - protocol: TCP
    port: 2181
    targetPort: 2181
    name: client
  - protocol: TCP
    port: 2888
    targetPort: 2888
    name: leader
  - protocol: TCP    
    port: 3888
    targetPort: 3888
    name: leader-election
  selector:
    app: zoo1
---
apiVersion: v1
kind: Service
metadata:
  name: zoo2-service
  namespace: zyts
spec:
  ports:
  - protocol: TCP
    port: 2181
    targetPort: 2181
    name: client
  - protocol: TCP
    port: 2888
    targetPort: 2888
    name: leader
  - protocol: TCP    
    port: 3888
    targetPort: 3888
    name: leader-election
  selector:
    app: zoo2   
---
apiVersion: v1
kind: Service
metadata:
  name: zoo3-service
  namespace: zyts
spec:
  ports:
  - protocol: TCP
    port: 2181
    targetPort: 2181
    name: client
  - protocol: TCP
    port: 2888
    targetPort: 2888
    name: leader
  - protocol: TCP    
    port: 3888
    targetPort: 3888
    name: leader-election
  selector:
    app: zoo3

执行

kubectl apply -f zookeeper.yml

查看部署情况：

集群内部服务调用zookeeper地址：zoo1-0.zoo1-service.zyts.svc.cluster.local:2181,zoo2-0.zoo2-service.zyts.svc.cluster.local:2181,zoo3-0.zoo3-service.zyts.svc.cluster.local:2181

登录任意一个zookeeper pod，测试集群是否可用。