CentOS7配置阿里云源

cd /etc/yum.repos.d/

mkdir backup

mv CentOS-* backup/

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

yum clean all

yum install -y epel-release

yum clean all

yum makecache

yum repolist enabled

yum repolist all