某次安装yum时遇到的问题

php扩展mcrypt时，需要先安装几个依赖包，安装是遇到下述错误：

错误描述：

#yum install libmcrypt libmcrypt-devel mcrypt mhash

Setting up Install Process

No package php-mcrypt available.
Error: Nothing to do

我们会看到centos yum从仓库中根本找不到这几个包。

yum  install epel-release  //扩展包更新包

# yum install libmcrypt libmcrypt-devel mcrypt mhash
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again

编辑/etc/yum.repos.d/epel.repo，把基础的恢复，镜像的地址注释掉
#baseurl
mirrorlist
改成
baseurl
#mirrorlist

然后安装成功!!