Centos yum源

国内巨快的Centos yum源
http://www.diybl.com/course/6_system/linux/Linuxjs/20081213/153625.html

cd /etc/yum.repos.d
mv CentOS-Base.repo  CentOS-Base.repo.save
wget http://centos.ustc.edu.cn/CentOS-Base.repo