linux安装docker
①yum install -y yum-utils device-mapper-persistent-data lvm2 --skip-broken
②yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
③yum makecache fast
④yum install -y docker-ce
⑤vi daemon.json,systemctl daemon-reload,systemctl restart docker