YUM更换源yum找不到安装包怎么办-创新互联
这篇文章主要介绍YUM更换源yum找不到安装包怎么办，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
公司提供的CentOS VM中，/etc/yum.repos.d 下 只有一个build.repo，其中提供的yum 源只有公司内部的几个源，很多包在这些源中都找不到。于是要添加别的源，下面的帖子中介绍了如何在CentOS中添加中科大、搜狐和163的yum源：。
更新方法如下：
先进入yum源配置目录
cd /etc/yum.repos.d
备份系统自带的yum源
mv CentOS-Base.repo CentOS-Base.repo.save
下载其他更快的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源后，建议更新一下，使操作立即生效
yum makecache
[yasi]:
在执行最后一步，即yum makecache的时候，遇到错误：
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 确实不存在，可能被更新掉了。解决办法是，找到可用的URL替换之，或者把相应的.repo文件中的项整个注释掉。这里我采用后者。
例如，在CentOS-Base-163.repo中，注释掉整个addon项
#[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/$basearch/
#gpgcheck=1
#pgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
在CentOS-Base-sohu.repo中注释掉下面的内容
#[addons]
#name=CentOS-$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
然后，再执行yum makecache。之后，yum就可以找到我要安装的包了，比如gdb, subversion, gcc-c++ 等。
注意：
有时用yum list xxx找不到某个包，可用尝试用yum search xxx。
如，yum list vim 就报告 Error: No matching Packages to list。而 yum search vim 则返回：
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
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