yum使用的镜像升级和下载软件有点小慢，现在网易干了件好事就是有了这个开源镜像站，速度还不是一般的快。
根据网上的文章“使用163开源镜像升级你的CentOS”修改，很简单的，操作过程如下，，做个笔记。平时用的是CentOS 4.7 sever版，网上多是CentOS 5.X版的，只是改动了gpgkey的验证版本和网站，因为baseurl的链接都是163的。当然不修改也可以，但是163镜像如果没有及时和CentOS镜像同步，估计使用yum时会有问题只是估计。
1.备份系统原来的CentOS-Base.repo文件： cd /etc/yum.repos.d/ #cp -a CentOS-Base.repo CentOS-Base.repo.bak
2.用vi打开CentOS-Base.repo文件： #vim CentOS-Base.repo
修改后的CentOS-Base.repo文件,代码如下：
# 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-$releasever – Base #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/ baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/ gpgcheck=1 #gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-4
#released updates [updates] name=CentOS-$releasever – Updates #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates #baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/ baseurl=http://mirrors.163.com/centos/$releasever/updates/$basearch/ gpgcheck=1 #gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-4
#packages used/produced in the build but not released [addons] name=CentOS-$releasever – Addons #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons #baseurl=http://mirror.centos.org/centos/$releasever/addons/$basearch/ baseurl=http://mirrors.163.com/centos/$releasever/addons/$basearch/ gpgcheck=1 #gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-4
#additional packages that may be useful [extras] name=CentOS-$releasever – Extras #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras #baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/ baseurl=http://mirrors.163.com/centos/$releasever/extras/$basearch/ gpgcheck=1 #gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-4
#additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever – Plus #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus #baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/ baseurl=http://mirrors.163.com/centos/$releasever/centosplus/$basearch/ gpgcheck=1 enabled=0 #gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-4
离开睁眼闭眼看见的城市，逃离身边的纷纷扰扰，
