1分钟，通过docker-compose 搭建zookeeper 集群

Posted 2021-01-26 mmmaaaggg

一、创建三节点 zookeeper 集群

1. 将 docker-compose.yml 保存到当前命令行目录下

docker-compose.yml 文件

version: ‘2‘
networks:
  zk:
services:
  zookeeper1:
    image: zookeeper
    container_name: zk1.cloud
    networks:
        - zk
    ports:
        - "2181:2181"
    environment:
      ZOO_MY_ID: 1
      ZOO_SERVERS: server.1=0.0.0.0:2888:3888 server.2=zk2.cloud:2888:3888 server.3=zk3.cloud:2888:3888
  zookeeper2:
    image: zookeeper
    container_name: zk2.cloud
    networks:
        - zk
    ports:
        - "2182:2181"
    environment:
      ZOO_MY_ID: 2
      ZOO_SERVERS: server.1=zk1.cloud:2888:3888 server.2=0.0.0.0:2888:3888 server.3=zk3.cloud:2888:3888
  zookeeper3:
    image: zookeeper
    container_name: zk3.cloud
    networks:
        - zk
    ports:
        - "2183:2181"
    environment:
      ZOO_MY_ID: 3
      ZOO_SERVERS: server.1=zk1.cloud:2888:3888 server.2=zk2.cloud:2888:3888 server.3=0.0.0.0:2888:3888

2. 执行命令，如果是首次获取 zookeeper 镜像，输出会有不同

输入

docker pull zookeeper

输出

latest: Pulling from library/zookeeper
Digest: sha256:3f03c6f5a91e0f638f3d6a755b2d32c06583766031353be87e2d633fa3006c23
Status: Image is up to date for zookeeper:latest

 

3. 后台启动 zookeeper 集群

docker-compose up -d

 

输出命令

Creating network "dczk_zk" with the default driver
Creating zk2.cloud ... done
Creating zk1.cloud ... done
Creating zk3.cloud ... done

---

 

二、检查进程状态

输入

docker ps

 

输出

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                        NAMES
cb176c76c620        zookeeper           "/docker-entrypoint.…"   6 minutes ago       Up 6 minutes        2888/tcp, 3888/tcp, 0.0.0.0:2183->2181/tcp   zk3.cloud
ee00aba1c766        zookeeper           "/docker-entrypoint.…"   6 minutes ago       Up 6 minutes        2888/tcp, 0.0.0.0:2181->2181/tcp, 3888/tcp   zk1.cloud
5d95baa693c2        zookeeper           "/docker-entrypoint.…"   6 minutes ago       Up 6 minutes        2888/tcp, 3888/tcp, 0.0.0.0:2182->2181/tcp   zk2.cloud

 

docker-compose ps

 

输出

Name                 Command               State                     Ports
-----------------------------------------------------------------------------------------------
zk1.cloud   /docker-entrypoint.sh zkSe ...   Up      0.0.0.0:2181->2181/tcp, 2888/tcp, 3888/tcp
zk2.cloud   /docker-entrypoint.sh zkSe ...   Up      0.0.0.0:2182->2181/tcp, 2888/tcp, 3888/tcp
zk3.cloud   /docker-entrypoint.sh zkSe ...   Up      0.0.0.0:2183->2181/tcp, 2888/tcp, 3888/tcp

---

 

三、测试

1. docker 3 为leader

输入

docker exec -it zk1.cloud bash ./bin/zkServer.sh status

 

输出

ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: follower

输入

docker exec -it zk2.cloud bash ./bin/zkServer.sh status

 

输出

ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: follower

输入

docker exec -it zk3.cloud bash ./bin/zkServer.sh status

 

输出

ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: leader

 

2. 关闭 zk3.cloud 后检查leader变化情况

输入

docker stop zk3.cloud
docker exec -it zk2.cloud bash ./bin/zkServer.sh status

输出

ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: leader

 

3. 再次启动 zk3.cloud 后检查 leader变化情况

输入

docker start zk3.cloud
docker exec -it zk2.cloud bash ./bin/zkServer.sh status

输出

ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: leader

输入

docker exec -it zk3.cloud bash ./bin/zkServer.sh status

输出

ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: follower

 

4. 关闭 zk2.cloud 后检查 leader变化情况

输入

docker stop zk2.cloud
docker exec -it zk3.cloud bash ./bin/zkServer.sh status

输出

ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: leader