docker-compose搭建zookeeper集群

准备zookeeper镜像

• 这里使用官方提供的镜像，版本为3.4.11
• docker-compose分布式管理组件，具体安装以及使用方法见github项目

准备docker-compose.yml文件

这里要注意下yml语法，key冒号后面有空格

• 这里采用官方镜像提供默认配置，可根据docker-compose配置说明做调整

version: '3.1'

services:
  zoo1:
    image: zookeeper:3.4.11
    restart: always
    hostname: zoo1
    container_name: zookeeper_1
    #domainname: 
    ports:
      - 2181:2181
    volumes:
      - /usr/local/docker_app/zookeeper/zoo1/data:/data
      - /usr/local/docker_app/zookeeper/zoo1/datalog:/datalog
    environment:
      ZOO_MY_ID: 1
      ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888

  zoo2:
    image: zookeeper:3.4.11
    restart: always
    hostname: zoo2
    container_name: zookeeper_2
    ports:
      - 2182:2181
    volumes:
      - /usr/local/docker_app/zookeeper/zoo2/data:/data
      - /usr/local/docker_app/zookeeper/zoo2/datalog:/datalog
    environment:
      ZOO_MY_ID: 2
      ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888

  zoo3:
    image: zookeeper:3.4.11
    restart: always
    hostname: zoo3
    container_name: zookeeper_3
    ports:
      - 2183:2181
    volumes:
      - /usr/local/docker_app/zookeeper/zoo3/data:/data
      - /usr/local/docker_app/zookeeper/zoo3/datalog:/datalog
    environment:
      ZOO_MY_ID: 3
      ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888

• docker-compse命令提供了一系列子命令

Define and run multi-container applications with Docker.

Usage:
  docker-compose [-f ...] [options] [COMMAND] [ARGS...]
  docker-compose -h|--help

Options:
  -f, --file FILE             Specify an alternate compose file (default: docker-compose.yml)
  -p, --project-name NAME     Specify an alternate project name (default: directory name)
  --verbose                   Show more output
  --no-ansi                   Do not print ANSI control characters
  -v, --version               Print version and exit
  -H, --host HOST             Daemon socket to connect to

  --tls                       Use TLS; implied by --tlsverify
  --tlscacert CA_PATH         Trust certs signed only by this CA
  --tlscert CLIENT_CERT_PATH  Path to TLS certificate file
  --tlskey TLS_KEY_PATH       Path to TLS key file
  --tlsverify                 Use TLS and verify the remote
  --skip-hostname-check       Don't check the daemon's hostname against the name specified
                              in the client certificate (for example if your docker host
                              is an IP address)
  --project-directory PATH    Specify an alternate working directory
                              (default: the path of the Compose file)

Commands:
  build              Build or rebuild services
  bundle             Generate a Docker bundle from the Compose file
  config             Validate and view the Compose file
  create             Create services
  down               Stop and remove containers, networks, images, and volumes
  events             Receive real time events from containers
  exec               Execute a command in a running container
  help               Get help on a command
  images             List images
  kill               Kill containers
  logs               View output from containers
  pause              Pause services
  port               Print the public port for a port binding
  ps                 List containers
  pull               Pull service images
  push               Push service images
  restart            Restart services
  rm                 Remove stopped containers
  run                Run a one-off command
  scale              Set number of containers for a service
  start              Start services
  stop               Stop services
  top                Display the running processes
  unpause            Unpause services
  up                 Create and start containers
  version            Show the Docker-Compose version information

• 校验指定配置文件正确性，默认配置文件名称docker-compose.yml或docker-compose.yml，我这里使用自定义名称zookeeper-compose.yml

注意：如若需指定配置文件，必须在docker-compose后面指定，不能在config等子命令后面指定，否则无效；如果你使用默认配置文件名称，不需要显式指定-f docker-compose.yml

// 查看config命令参数
$ docker-compose -f zookeeper-compose.yml config --help
// 校验配置文件，不打印
$ docker-compose -f zookeeper-compose.yml config -q

启动zookeeper集群

// -d 后台启动
$ docker-compose -f zookeeper-compose.yml up -d

• 查看容器启动情况

$ docker-compose -f zookeeper-compose.yml ps
   Name                  Command               State                     Ports                   
-------------------------------------------------------------------------------------------------
zookeeper_1   /docker-entrypoint.sh zkSe ...   Up      0.0.0.0:2181->2181/tcp, 2888/tcp, 3888/tcp
zookeeper_2   /docker-entrypoint.sh zkSe ...   Up      0.0.0.0:2182->2181/tcp, 2888/tcp, 3888/tcp
zookeeper_3   /docker-entrypoint.sh zkSe ...   Up      0.0.0.0:2183->2181/tcp, 2888/tcp, 3888/tcp

查看zookeeper集群状态

zoo1

$ docker exec -it zookeeper_1 /bin/sh

/zookeeper-3.4.11 # zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: follower                  // 这是个follower

zoo2

$ docker exec -it zookeeper_2 /bin/sh

/zookeeper-3.4.11 # zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: leader                // 这是个leader

zoo3

$ docker exec -it zookeeper_3 /bin/sh

/zookeeper-3.4.11 # zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Mode: follower            // 这也是个follower哦

• 三个zookeeper服务都正常启动了