cd /etc/yum.repos.d  

mv CentOS-Base.repo CentOS-Base.repo.save  

wget http://centos.ustc.edu.cn/CentOS-Base.repo  

CentOS-Base.repo

This file uses a new mirrorlist system developed by Lance Davis for CentOS.  

The mirror system uses the connecting IP address of the client and the  

update status of each mirror to pick mirrors that are updated to and  

geographically close to the client. You should use this for CentOS updates  

unless you are manually picking other mirrors.  

If the mirrorlist= does not work for you, as a fall back you can try the   

remarked out baseurl= line instead.

下面是最近的CentOS源代码中比较不错的

[base]

name=CentOS-$releasever - Base  

#mirrorlist=http://centos.ustc.edu.cn/?release=$releasever&arch=$basearch&repo=os

baseurl=http://centos.ustc.edu.cn/centos/$releasever/os/$basearch/  

gpgcheck=1

gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5  

#released updates   

[update]

name=CentOS-$releasever - Updates  

#mirrorlist=http://centos.ustc.edu.cn/?release=$releasever&arch=$basearch&repo=updates

baseurl=http://centos.ustc.edu.cn/centos/$releasever/updates/$basearch/  

gpgcheck=1

gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5  

#packages used/produced in the build but not released  

[addons]

name=CentOS-$releasever - Addons  

#mirrorlist=http://centos.ustc.edu.cn/?release=$releasever&arch=$basearch&repo=addons

baseurl=http://centos.ustc.edu.cn/centos/$releasever/addons/$basearch/  

gpgcheck=1

gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5  

#additional packages that may be useful  

[extras]

name=CentOS-$releasever - Extras  

#mirrorlist=http://centos.ustc.edu.cn/?release=$releasever&arch=$basearch&repo=extras

baseurl=http://centos.ustc.edu.cn/centos/$releasever/extras/$basearch/  

gpgcheck=1

gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5  

#additional packages that extend functionality of existing packages  

[centosplus]

name=CentOS-$releasever - Plus  

#mirrorlist=http://centos.ustc.edu.cn/?release=$releasever&arch=$basearch&repo=centosplus

baseurl=http://centos.ustc.edu.cn/centos/$releasever/centosplus/$basearch/  

gpgcheck=1

enabled=0

gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5  

#contrib - packages by Centos Users  

[contrib]

name=CentOS-$releasever - Contrib  

#mirrorlist=http://centos.ustc.edu.cn/?release=$releasever&arch=$basearch&repo=contrib

baseurl=http://centos.ustc.edu.cn/centos/$releasever/contrib/$basearch/  

gpgcheck=1

enabled=0

gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5  

这是最近国内更新CentOS源代码中比较好的。希望对大家有所帮助。