国内yum镜像（搜狐）电信，网通快速的centos镜像，sohu搜狐centos镜像，速度快，稳定

先备份旧的ｙｕｍ源：mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.ctohome.com

2、下载CentOS中文更新yum镜像配置文件，按照需要修改一下，如你的发行版为4那就把centos5改成centos4即可。然后：

vi /etc/yum.repos.d/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.
#
#
# CentOS-Base.repo
[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.sohu.com/centos/5.5/os/$basearch/
http://centos.candishosting.com.cn/5.5/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5
#released updates
[update]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.sohu.com/centos/5.5/updates/$basearch/
http://centos.candishosting.com.cn/5.5/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5
#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
baseurl=http://mirrors.sohu.com/centos/5.5/addons/$basearch/
http://centos.candishosting.com.cn/5.5/addons/$basearch/
gpgcheck=1
gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirrors.sohu.com/centos/5.5/extras/$basearch/
http://centos.candishosting.com.cn/5.5/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirrors.sohu.com/centos/5.5/centosplus/$basearch/
http://centos.candishosting.com.cn/5.5/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
baseurl=http://mirrors.sohu.com/centos/5.5/contrib/$basearch/
http://centos.candishosting.com.cn/5.5/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5