163 源网站：http://mirrors.163.com/.help/centos.html
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup cd /etc/yum.repos.d/ 网易163源： wget http://mirrors.163.com/.help/CentOS7-Base-163.repo yum -y install epel-release yum clean all yum makecache 阿里云源： wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo yum -y install epel-release yum clean all yum makecache epel源： yum -y install epel-release yum clean all yum makecache