本文以163为例，
cd /etc/yum.repos.d/
wget
http://mirrors.163.com/.help/CentOS6-Base-163.repo
wget
http://mirrors.163.com/.help/CentOS6-Base-163.repo 
http://mirrors.163.com/.help/CentOS6-Base-163.repo 原文：https://www.cnblogs.com/azhqiang/p/8177408.html