本文作者：丁辉

Centos7更换阿里源

1. 备份本地Yum源

   mkdir -p /etc/yum.repos.d/backup/
   mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/backup/

2. 下载阿里云Yum源

   curl -O http://mirrors.aliyun.com/repo/Centos-7.repo
   curl -O http://mirrors.aliyun.com/repo/epel-7.repo

3. 删除缓存数据

   yum clean all

4. 创建元数据缓存

   yum makecache