快速为CentOS配置yum测试更新库

　　我们知道CentOS由yum通过/etc/yum.repos.d/CentOS-Base.repo里的配置进行镜像服务器查找更新，最近给客户安装一个MANTIS和TESTLINK组建的测试平台，发现CentOS自带PHP是５.１版本，不支持最新的phpMyAdmin和TESTLINK，这两个应用的最新版本都需要5.2或更高版本的PHP环境。

 

　　在网上查阅相关资料后发现，其实CentOS团队还维护着一个测试更新库，这里有许多“测试”版应用（暂仅这么称呼着，我的理解是因种种原因没有正式对外发行而已），经过简单的修改就可以得到以下配置文件：

 

# CentOS-Base.repo
#
# 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/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#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/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#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/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#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/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#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/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

[testing]
name=CentOS-$releasever - Testing
baseurl=http://dev.centos.org/centos/$releasever/testing/$basearch/
enabled=0
gpgcheck=1
gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing

 

　　可以在配置文件最后增加一个[testing]节，注意这个配置节和它上面系统自带的两个配置节设置了参数enabled=0，平时我们执行yum upgrade时并不会被检查，只有通过适当变通，我们才可能通过这些库查找或更新更多应用（因为CentOS团队没有正式对外发行，所以建议只在“迫不得已”的情况下使用），例如我要安装最新的php，在控制台执行以下命令，yum就会发现并提示是否要安装5.2.9-2版本的PHP：

 

　　yum install php --disablerepo=/* --enablerepo=testing

 

　　注意后两个参数的使用，屏蔽了其它更新库的使用，打开了测试更新库，通过这种方式找到了5.2版本的PHP，正是我需要的；其实通过这种方式还可以找到更高版本的MySQL和Apache Http Server等，不过要不要更新全由你自己决定了。　：）