metalink.xml does not exist

最近在虚拟机上执行yum命令一直报错：
Could not parse metalink https://mirrors.fedoraproject.org/metalink?repo=epel-7&arch=i386 error was
No repomd file
Error: File /var/cache/yum/i386/6/epel/metalink.xml does not exist
yum源是没问题的按照网上的说法也换了个163的源，yum clean all、yum makecache还是不行，
后来网上了解到，这个epel-7是不能用于centos6.x的，卸载了，再安装就行了：
如果是CentOS6.x执行下面就行了：
yum remove epel-release --disablerepo=epel\*
yum install epel-release