CentOS终于有了中国镜像！

对在中国的CentOS支持者们，一件好事情：CentOS终于有了在中国的镜像，分别设在上海、香港、福建。

活用这个资源的之一，就是通过yum高速更新系统。

在初始环境设置中，我们可以将yum作为一项常驻的服务自动更新系统，但默认的服务器是官方的站点，离中国用户比较远，速度不堪忍受。但修改yum相应配置文件就可以达到高速更新系统的目的，方法如下：

修改/etc/yum.repos.d/CentOS-Base.repo，将镜象站点地址改为在中国的景象站点地址。如下：
# 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.
#
#

[base]
name=CentOS-$releasever - Base
baseurl=http://mirror.vmmatrix.net/CentOS/$releasever/os/$basearch/
        http://mirror.be10.com/centos/$releasever/os/$basearch/
        http://centos.hostlink.com.hk/$releasever/os/$basearch/
        http://ftp.hostrino.com/pub/centos/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4

#released updates
[update]
name=CentOS-$releasever - Updates
baseurl=http://mirror.vmmatrix.net/CentOS/$releasever/os/$basearch/
        http://mirror.be10.com/centos/$releasever/os/$basearch/
        http://centos.hostlink.com.hk/$releasever/os/$basearch/
        http://ftp.hostrino.com/pub/centos/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4

#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
baseurl=http://mirror.vmmatrix.net/CentOS/$releasever/os/$basearch/
        http://mirror.be10.com/centos/$releasever/os/$basearch/
        http://centos.hostlink.com.hk/$releasever/os/$basearch/
        http://ftp.hostrino.com/pub/centos/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirror.vmmatrix.net/CentOS/$releasever/os/$basearch/
        http://mirror.be10.com/centos/$releasever/os/$basearch/
        http://centos.hostlink.com.hk/$releasever/os/$basearch/
        http://ftp.hostrino.com/pub/centos/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4

#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4然后更新一次系统，并将yum设置为自启动，让其即时自动为系统更新。

# yum -y update

# chkconfig yum on

# /etc/rc.d/init.d/yum start

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