epel 源:
centos6.x
rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
centos7.0
rpm -Uvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
wget http://mirrors.opencas.cn/epel/6/i386/epel-release-6-8.noarch.rpm
wget http://mirrors.opencas.cn/epel/6/x86_64/epel-release-6-8.noarch.rpm