执行：yum install nginx 提示如下错误，下面说一下解决方法。
Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile Error: Cannot retrieve metalink for repository: epel. Please verify its path and try again
处理很简单，修改文件“vi /etc/yum.repos.d/epel.repo”， 将baseurl的注释取消， mirrorlist注释掉。即可。
如在安装nginx提示如下错误的：
Setting up Install ProcessNo package nginx available.Error: Nothing to do
