1. 从sohu镜像下载epel-release-6源包并安装。
wget http://mirrors.sohu.com/fedora-epel/6/x86_64/epel-release-6-8.noarch.rpm
[root@centos64 fedora-epel]# ls
epel-release-6-8.noarch.rpm
[root@centos64 fedora-epel]# rpm -ivh epel-release-6-8.noarch.rpm
2.导入公钥，完成了。
[root@centos64 Packages]# rpm --import/etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
OK ,搞定.
其它更简单的方法：
yum install epel-release
附比较快且软件版本较新的yum源:
https://fedoraproject.org/wiki/EPEL/zh-cn
清空yum缓存
yum clean all
生成缓存
yum makecache
更新系统以及内核
yum upgrade
