Step 1
备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
进入yum文件夹
cd /etc/yum.repos.d
下载阿里源的文件
wget -O CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
安装epel repo源
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
Step 2
清理缓存
yum clean all
重新生成缓存
yum makecache
更新
yum update
