安装docker源的配置
mkdir /opt/yum.bak/
mv /etc/yum.repos.d/*.repo /opt/yum.bak/
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
rpm -Uvh http://mirrors.aliyun.com/epel/epel-release-latest-7.noarch.rpm
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum makecache fast
