转自：http://blog.onovps.com/archives/centos-yum-epel.html
EPEL即Extra Packages for Enterprise Linux，也就是为企业级 Linux提供的扩展软件源，适用于 RHEL，CentOS，Scientific Linux系统。
安装方法
#Centos 5 32位 rpm -ivh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm #Centos 5 64位 rpm -ivh http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm #Centos 6 32位 rpm -ivh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm #Centos 6 64位 rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm