Epel介绍
具体请参见：http://fedoraproject.org/wiki/EPEL
如何安装 Epel源到 RHEL/CentOS 7/6/5?
通过wget命令下载RPM文件，然后安装。
RHEL/CentOS 7
# wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm # rpm -ivh epel-release-latest-7.noarch.rpm
RHEL/CentOS 6
## RHEL/CentOS 6 # wget
http://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm# rpm -ivh epel-release-6.noarch.rpm
如何检查epel是否安装成功？
使用一下命令：
# yum repolist
输出如下
[root@Lixiaolong ~]# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.yun-idc.com
* epel: ftp.sjtu.edu.cn
* extras: mirrors.yun-idc.com
* updates: mirrors.yun-idc.com
repo id repo name status
base/7/x86_64 CentOS-7 - Base 8,465
epel/x86_64 Extra Packages for Enterprise Linux 7 - x86_64 5,036
extras/7/x86_64 CentOS-7 - Extras 30
updates/7/x86_64 CentOS-7 - Updates 423
repolist: 13,954
[root@Lixiaolong ~]#
IT网，http://www.it.net.cn
如何使用epel源安装软件？
例如想查看cacti信息
# yum --enablerepo=epel info cacti
IT网，http://www.it.net.cn
安装则执行以下命令：
# yum --enablerepo=epel install cacti
Note: Epel的配置文件在/etc/yum.repos.d/epel.repo.