公司提供的CentOS VM中，/etc/yum.repos.d 下 只有一個build.repo，其中提供的yum 源只有公司內部的幾個源，很多包在這些源中都找不到。於是要新增別的源，下面的帖子中介紹瞭如何在CentOS中新增中科大、搜狐和163的yum源：http://www.husw.net/blog/post/1386/。摘錄如下：

本文章介紹的yum源支援的版本是CentOS 6系列，理論上支援RHEL6系列。
更新方法如下：
先進入yum源配置目錄

cd /etc/yum.repos.d 備份系統自帶的yum源
mv CentOS-Base.repo CentOS-Base.repo.save

下載其他更快的yum源
中科大的yum源：
wget http://centos.ustc.edu.cn/CentOS-Base.repo

163的yum源：
wget http://mirrors.163.com/.help/CentOS-Base-163.repo

sohu的yum源
wget http://mirrors.sohu.com/help/CentOS-Base-sohu.repo

更新完yum源後，建議更新一下，使操作立即生效
yum makecache [yasi]: 在執行最後一步，即yum makecache的時候，遇到錯誤：

Loaded plugins: fastestmirror Repository base is listed more than once in the configuration Repository updates is listed more than once in the configuration Repository extras is listed more than once in the configuration Repository centosplus is listed more than once in the configuration Repository contrib is listed more than once in the configuration Loading mirror speeds from cached hostfile  * addons: mirrors.163.com  * base: mirror.metrocast.net  * extras: mirror.beyondhosting.net  * fasttrack: centos.vipernetworksystems.com  * updates: centos.vipernetworksystems.com http://mirrors.163.com/centos/6/addons/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404"

Trying other mirror. http://mirror.centos.org/centos/6/addons/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404" Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: addons. Please verify its path and try again

原因是，http://mirrors.163.com/centos/6/addons/x86_64/repodata/repomd.xml和 http://mirror.centos.org/centos/6/addons/x86_64/repodata/repomd.xml 確實不存在，可能被更新掉了。解決辦法是，找到可用的URL替換之，或者把相應的.repo檔案中的項整個註釋掉。這裡我採用後者。 例如，在CentOS-Base-163.repo中，註釋掉整個addon項

#[addons] #name=CentOS-$releasever - Addons - 163.com #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons #baseurl=http://mirrors.163.com/centos/$releasever/addons/$basearch/ #gpgcheck=1 #pgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

在CentOS-Base-sohu.repo中註釋掉下面的內容

#[addons] #name=CentOS-$releasever - Addons - sohu.com #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons #baseurl=http://mirrors.sohu.com/centos/$releasever/addons/$basearch/ #gpgcheck=1 #gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5CentOS-Base-sohu.repo

然後，再執行yum makecache。之後，yum就可以找到我要安裝的包了，比如gdb, subversion, gcc-c++ 等。 注意： 有時用yum list xxx找不到某個包，可用嘗試用yum search xxx。 如，yum list vim 就報告 Error: No matching Packages to list。而 yum search vim 則返回：

vim-X11.x86_64 : The VIM version of the vi editor for the X Window System vim-common.x86_64 : The common files needed by any version of the VIM editor vim-enhanced.x86_64 : A version of the VIM editor which includes recent enhancements vim-minimal.x86_64 : A minimal version of the VIM editor