RHEL6:
[root@test ~]# rpm -ivh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm
[root@test ~]# rpm -ivh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
RHEL5:
[root@test ~]# rpm -ivh http://download.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
[root@test ~]# rpm -ivh http://download.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
EPEL版本不同，根据不同系统请自行安装。