1. 安装：

使用Centos 版本3.10.0-862.6.3.el7.x86_64

#先清除原有版本
yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate

#安装依赖
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

#安装docker
yum install docker-ce docker-ce-cli containerd.io

#启动
systemctl start docker

2. docker基本信息

docker version

docker info    

3. docker image和container操作

#查找镜像
docker search xxxxxx

#拉取镜像
docker pull xxxxx

#查看本地image
docker images 或 docker images ls

#查看container
docker container ls --all 或 docker ps -a

#启动 宿主机端口：container端口，-d是常驻后端

docker run -itd -p 4000:80 xxxxxx

#进入container内，如果内部无法vi，执行apt-get update、apt-get install vim
docker exec -it -u 0 xxxxxx bash

#可以使用rm来移除image和container，停止container用

4. docker compose 安装

yum install docker-compose

5. 使用docker compose安装zookeeper

#创建docker-compose.yml文件
version: '1'
services:
    zoo1:
        image: zookeeper
        restart: always
        container_name: zoo1
        ports:
            - "2181:2181"
        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
        restart: always
        container_name: zoo2
        ports:
            - "2182:2181"
        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
        restart: always
        container_name: zoo3
        ports:
            - "2183:2181"
        environment:
            ZOO_MY_ID: 3
            ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888

端口2181、2182、2183将会暴露出来

#启动
docker-compose -f docker-compose.yml up

#查看
docker-compose ps

使用 Docker 命令行客户端连接 ZK 集群

docker run -it --rm --link zoo1:zk1 --link zoo2:zk2 --link zoo3:zk3 
               --net zktest_default zookeeper zkCli.sh -server zk1:2181,zk2:2181,zk3:2181

测试

echo stat | nc 127.0.0.1 2181