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-$releasever -
Base
baseurl=centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=centos/RPM-GPG-KEY-CentOS-5
#released
updates
[updates]
name=CentOS-$releasever -
Updates
baseurl=centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=centos/RPM-GPG-KEY-CentOS-5
#packages
used/produced in the build but not
released
[addons]
name=CentOS-$releasever -
Addons
baseurl=centos/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=centos/RPM-GPG-KEY-CentOS-5
#additional
packages that may be useful
[extras]
name=CentOS-$releasever -
Extras
baseurl=centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=centos/RPM-GPG-KEY-CentOS-5
#additional
packages that extend functionality of existing
packages
[centosplus]
name=CentOS-$releasever -
Plus
baseurl=centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=centos/RPM-GPG-KEY-CentOS-5
也可以使用，
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