CentOS 安装Docker

1.卸载旧版本

$ sudo yum remove docker 
                  docker-client 
                  docker-client-latest 
                  docker-common 
                  docker-latest 
                  docker-latest-logrotate 
                  docker-logrotate 
                  docker-selinux 
                  docker-engine-selinux 
                  docker-engine

2.安装需要的软件包

$ sudo yum install -y yum-utils 
  device-mapper-persistent-data 
  lvm2

//设置yum源
$ sudo yum-config-manager 
    --add-repo 
    https://download.docker.com/linux/centos/docker-ce.repo

3.安装Docker CE

$ sudo yum install docker-ce

4.启动并加入开机启动

$ sudo systemctl start docker
$ sudo systemctl enable docker

5.验证是否安装成功

//一般包含client和server两部分代表安装成功
$ docker version

6.官方镜像加速

    // /etc/docker/daemon.json 
    {
      "registry-mirrors": ["https://registry.docker-cn.com"]
    }