rpm -q epel-release
package epel-release is not installed
如果没有安装，则install：
rpm -ivh
x64

http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm

x86

http://mirrors.ustc.edu.cn/fedora/epel/6/i386/epel-release-6-8.noarch.rpm

rpm –import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

yum install yum-priorities

cd /etc/yum.repos.d/
ls |grep epel
epel.repo
epel-testing.rep