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.
执行以下命令就可以了
cd /etc/yum.repos.d
mv CentOS-Base.repo CentOS-Base.repo.bak
wget
mv CentOS-Base.repo.5 CentOS-Base.repo
cat CentOS-Base.repo
[base]name=CentOS-$releasever – Basebaseurl=http://centos.ustc.edu.cn/centos/$releasever/os/$basearch/gpgcheck=1gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#released updates [updates]name=CentOS-$releasever – Updatesbaseurl=http://centos.ustc.edu.cn/centos/$releasever/updates/$basearch/gpgcheck=1gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#packages used/produced in the build but not released[addons]name=CentOS-$releasever – Addonsbaseurl=http://centos.ustc.edu.cn/centos/$releasever/addons/$basearch/gpgcheck=1gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful[extras]name=CentOS-$releasever – Extrasbaseurl=http://centos.ustc.edu.cn/centos/$releasever/extras/$basearch/gpgcheck=1gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#additional packages that extend functionality of existing packages[centosplus]name=CentOS-$releasever – Plusbaseurl=http://centos.ustc.edu.cn/centos/$releasever/centosplus/$basearch/gpgcheck=1enabled=0gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
也可以使用，
一个人行走，若是寂寞了，寻一座霓虹灯迷离闪烁，
