1.首先备份/etc/yum.repos.d/CentOS-Base.repo

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2.下载网易的repo文件 http://mirrors.163.com/.help/CentOS6-Base-163.repo  放入/etc/yum.repos.d/(操作前请做好相应备份)

3.修改 CentOS-Media.repo，把 baseurl 改成  baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/ 

4.运行以下命令生成缓存

yum clean all yum makecache

CentOS 6.5添加163源