CentOS7換阿里雲Yum源

複製粘貼即可

yum -yq install wget
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
wget -O /etc/yum.repos.d/ http://mirrors.aliyun.com/repo/Centos-7.repo
yum clean all