[系统运维]使用docker搭建zookeeper 集群

1.注册docker账号

https://www.docker.com/

2.安装docker

https://docs.docker.com/engine/install/

3.建文件夹 zk_cluster

4.在zk_cluster文件夹下创建文件docker-compose.yml，文件内容如下：

services:
  zk01:
    image: zookeeper
    restart: always
    hostname: zk01
    ports:
      - 2001:2181
      - 3001:2888
      - 4001:3888
    environment:
      ZOO_MY_ID: 1
      ZOO_SERVERS: server.1=0.0.0.0:2888:3888;2181 server.2=zk02:2888:3888;2181 server.3=zk03:2888:3888;2181
    networks:
      default:
        ipv4_address: 10.0.0.101
  zk02:
    image: zookeeper
    restart: always
    hostname: zk02
    ports:
      - 2002:2181
      - 3002:2888
      - 4002:3888
    environment:
      ZOO_MY_ID: 2
      ZOO_SERVERS: server.1=zk01:2888:3888;2181 server.2=0.0.0.0:2888:3888;2181 server.3=zk03:2888:3888;2181
    networks:
      default:
        ipv4_address: 10.0.0.102
  zk03:
    image: zookeeper
    restart: always
    hostname: zk03
    ports:
      - 2003:2181
      - 3003:2888
      - 4003:3888
    environment:
      ZOO_MY_ID: 3
      ZOO_SERVERS: server.1=zk01:2888:3888;2181 server.2=zk02:2888:3888;2181 server.3=0.0.0.0:2888:3888;2181
    networks:
      default:
        ipv4_address: 10.0.0.103
networks:
  default:
    external:
      name: zknet

5.在zk_cluster目录下运行如下命令，启动集群

docker-compose up?

6.下载zookeeper客户端（部署在真机上），连接集群进行测试

https://zookeeper.apache.org/releases.html

下载后的安装包bin目录有window和linux两个客户端，这里以macos上的客户端为例

./zkCli.sh -server localhsot:2001,localhost:2001,localhost:2003

连接上集群后可以创建节点、设置节点的值和查询节点的值，命令如下：

create /hello
set /hello world
get /hello

然后登录集群中的节点，查看是否存在我们设置的值。

zk01节点

docker exec -it zk01 bash

cd bin
./zkCli.sh
get /hello

?zk02节点

docker exec -it zk02 bash

cd bin
./zkCli.sh
get /hello

??zk03节点

docker exec -it zk03 bash

cd bin
./zkCli.sh
get /hello