2.使用yum命令安装:
(1)添加yum仓库
$sudo yum update
$sudo tee /etc/yum.repos.d/docker.repo << -EOF
>[dockerrepo]
>name=Docker Repository
>baseurl=
https://yum.dockerproject.org/repo/main/centos/7>enabled=1
>gpgcheck=1
>gpgkey=
https://yum.dockerproject.org/gpg>EOF