在CentOS系统中，yum是个好东西，一组件可以直接通过yum来安装，但系统默认的yum源速度往往不尽人意，为了达到快递安装的目的，在这里就需要修改yum源
中科大的Centos 开源镜像站点.http://centos.ustc.edu.cn/
执行以下命令就可以了
cd /etc/yum.repos.d
mv CentOS-Base.repoCentOS-Base.repo.bak
wget http://centos.ustc.edu.cn/CentOS-Base.repo.5
mv CentOS-Base.repo.5CentOS-Base.repo
cat CentOS-Base.repo
[base]
name=CentOS-$releasever -Base
baseurl=http://centos.ustc.edu.cn/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#releasedupdates
[updates]
name=CentOS-$releasever -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
#packagesused/produced in the build but notreleased
[addons]
name=CentOS-$releasever -Addons
baseurl=http://centos.ustc.edu.cn/centos/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#additionalpackages that may be useful
[extras]
name=CentOS-$releasever -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
#additionalpackages that extend functionality of existingpackages
[centosplus]
name=CentOS-$releasever -Plus
baseurl=http://centos.ustc.edu.cn/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
也可以使用，http://mirrors.163.com/ http://mirrors.sohu.com
本文出自 “聆听未来” 博客，请务必保留此出处http://blog.chinaunix.net/space.php?uid=9419692&do=blog&id=3184103