kubernete上zookeeper的搭建

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作者:俊泳

zookeeper科普

zooKeeper 是一个开源的分布式协调服务，由雅虎创建，是 Google Chubby 的开源实现。分布式应用程序可以基于 ZooKeeper 实现诸如数据发布/订阅、负载均衡、命名服务、分布式协调/通知、集群管理、Master 选举、分布式锁和分布式队列等功能。

基本概念：

集群角色：Leader, Follower, Observer

Leader：选举产生，读/写；

Follower：参与选举，可被选举，读服务；

Observer：参与选举，不可被选举，提供读服务；

会话：ZK中，客户端<-->服务端，TCP长连接；

默认端口概念：代码访问client的端口号： 2181

　　　　　　　leader和flower通信的端口号： 2888

　　　　　　选举leader时通信的端口号： 3888

那我们开始在k8s搭建zookeeper集群。

step1 编写相关组件yaml文件

以下yaml文件中包括 pv,Headless Service,Service,PodDisruptionBudget,StatefulSet

新建文件 zookeeper.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: zookeeper-pv
  labels:
    pv: zookeeper-pv00
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    path: /zookeeper
    server: *.*.*.* 
---

apiVersion: v1
kind: PersistentVolume
metadata:
  name: zookeeper-pv01
  labels:
    pv: zookeeper-pv
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    path: /zookeeper
    server: *.*.*.* 
---

apiVersion: v1
kind: PersistentVolume
metadata:
  name: zookeeper-pv02
  labels:
    pv: zookeeper-pv
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    path: /zookeeper
    server: *.*.*.*

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: zk
  namespace: tools
spec:
  selector:
    matchLabels:
      app: zk
  serviceName: zk-hs
  replicas: 3
  updateStrategy:
    type: RollingUpdate
  podManagementPolicy: OrderedReady
  template:
    metadata:
      labels:
        app: zk
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                    - zk
              topologyKey: "kubernetes.io/hostname"
      containers:
      - name: kubernetes-zookeeper
        imagePullPolicy: Always
        image: "mirrorgooglecontainers/kubernetes-zookeeper:1.0-3.4.10" ##该镜像位于dockerhub 可自行下载
        resources:
          requests:
            memory: "5Gi"
            cpu: "2"
        ports:
        - containerPort: 2181
          name: client
        - containerPort: 2888
          name: server
        - containerPort: 3888
          name: leader-election
        command:
        - sh
        - -c
        - "start-zookeeper 
          --servers=3 
          --data_dir=/var/lib/zookeeper/data 
          --data_log_dir=/var/lib/zookeeper/data/log 
          --conf_dir=/opt/zookeeper/conf 
          --client_port=2181 
          --election_port=3888 
          --server_port=2888 
          --tick_time=2000 
          --init_limit=10 
          --sync_limit=5 
          --heap=512M 
          --max_client_cnxns=1000 
          --snap_retain_count=3 
          --purge_interval=12 
          --max_session_timeout=40000 
          --min_session_timeout=4000 
          --log_level=INFO"
        readinessProbe:
          exec:
            command:
            - sh
            - -c
            - "zookeeper-ready 2181"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        livenessProbe:
          exec:
            command:
            - sh
            - -c
            - "zookeeper-ready 2181"
          initialDelaySeconds: 10
          timeoutSeconds: 5
        volumeMounts:
        - name: datadir-zk
          mountPath: /var/lib/zookeeper
      securityContext:
        runAsUser: 1000
        fsGroup: 1000
  volumeClaimTemplates:
    - metadata:
        name: datadir-zk
      spec:
        accessModes: [ "ReadWriteOnce" ]
        resources:
          requests:
            storage: 10Gi 
        selector:
          matchLabels:
            pv: zookeeper-pv

打开一个terminal，使用kubectl命令来创建zk集群

kubectl apply -f zookeeper.yaml

step2 启动成功后验证集群可用性

　　使用kubectl exec 进行集群验证

kubectl exec zk-0 zkServer.sh status

kubectl exec zk-1 zkServer.sh status

kubectl exec zk-2 zkServer.sh status

正常返回结果应该是改节点在集群中的状态 leader follower

kubectl exec zk-0 zkCli.sh create /hello world
kubectl exec zk-1 zkCli.sh get  /hello

如返回 world则zk集群搭建成功

参考文档：https://kubernetes.io/docs/tutorials/stateful-application/zookeeper/

内容来源于网络如有侵权请私信删除

文章来源: 博客园

原文链接: https://www.cnblogs.com/ruiqijunyong/p/13960975.html

标签：云计算

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kubernete上zookeeper的搭建