我这里用的是中标麒麟V7.0
备份默认YUM源
cd /etc/yum.repos.d/
mv ns7-adv.repo{,.bak}
下载并修改阿里YUM源
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
sed -i ‘s/$releasever/7/g’ /etc/yum.repos.d/CentOS-Base.repo
安装epel源
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo