今天我在用CentOS 7的yum命令安装的时候出现如下错误：
[[email protected] ~]# yum install vim
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.hosting90.cz
* extras: mirror.hosting90.cz
* updates: mirror.hosting90.cz
Setting up Install Process
No package vim available.
Nothing to do
对于此错误，我一般习惯性先去更新一下yum仓库：
#yum -y update
再次运行安装，发现错误依旧，看来这种猜包名的方法不适用；所以接下来可以通过yum的查找参数来列出vim相关的包名:
[[email protected] yum.repos.d]# yum search vim
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.hosting90.cz
* extras: mirror.hosting90.cz
* updates: mirror.hosting90.cz
===================== Matched: vim ===================
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.
通过查看，我们可以看到，yum列出了详细的vim相关的包名，这样就可以顺利的安装vim了：
#yum -y install vim-enhanced.x86_64
以上命令就能执行成功了。当然不仅仅vim安装，其他程序比如mysql我们也同样只要先进行yum查找，再通过匹配详细包名来进行安装，就不会出现上述错误了。