安装配置yum源：wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

sed -i ‘s/$releasever/7/g’ /etc/yum.repos.d/CentOS-Base.repo

docker国内镜像仓库：yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo