cnetos7 安装docker

卸载本机docker
增加docker仓库
安装docker
配置docker

1.卸载旧版本docker
   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.安装依赖
  yum install -y yum-utils device-mapper-persistent-data lvm2

3.添加repo
  yum-config-manager --add-repo https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo

4.安装并更新
  yum makecache
  yum install -y docker-ce

5.启动&自启动docker
  systemctl start docker
  systemctl enable docker

6.配置docker镜像加速
  curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s     http://f1361db2.m.daocloud.io
  systemctl restart docker