教程
http://mirrors.163.com/.help/centos.html
流程
前提是安装了wget
1.需要root权限
$ mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2.cdlinux $ cd /etc/yum.repos.d/
linux
3.选择对应版本的链接
$ wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
4.缓存
$ yum clean all
$ yum makecache