mv /etc/yum.repos.d /etc/yum.repos.d.backup4comex
新建空的yum源設置目錄
mkdir /etc/yum.repos.d
下載阿里雲的yum源配置
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
重建緩存
yum clean all yum makecache
備註:
其它的yum源,如網易:http://mirrors.163.com/.help/CentOS7-Base-163.repo