下载并安装了最新的Centos7.0系统，系统默认带的YUM源有时候不能满足需求，故使用fodora epelyum源是个不错的选择，eple所对应的RHEL7和Centos7已经出来了，替换方法如下：
Epel介绍
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 64 Bit
##RHEL/CentOS764-Bit## #wgethttp://dl.fedoraproject.org/pub/epel/beta/7/x86_64/epel-release-7-0.2.noarch.rpm #rpm-ivhepel-release-7-0.2.noarch.rpm
RHEL/CentOS 6 32-64 Bit
##RHEL/CentOS632-Bit## #wgethttp://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm #rpm-ivhepel-release-6-8.noarch.rpm ##RHEL/CentOS664-Bit## #wgethttp://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm #rpm-ivhepel-release-6-8.noarch.rpm
RHEL/CentOS 5 32-64 Bit
##RHEL/CentOS532-Bit## #wgethttp://download.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm #rpm-ivhepel-release-5-4.noarch.rpm ##RHEL/CentOS564-Bit## #wgethttp://download.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm #rpm-ivhepel-release-5-4.noarch.rpm
RHEL/CentOS 4 32-64 Bit
##RHEL/CentOS432-Bit## #wgethttp://download.fedoraproject.org/pub/epel/4/i386/epel-release-4-10.noarch.rpm #rpm-ivhepel-release-4-10.noarch.rpm ##RHEL/CentOS464-Bit## #wgethttp://download.fedoraproject.org/pub/epel/4/x86_64/epel-release-4-10.noarch.rpm #rpm-ivhepel-release-4-10.noarch.rpm
如何检查epel是否安装成功？
使用一下命令：
#yumrepolist
输出如下
[root@Lixiaolong~]#yumrepolist Loadedplugins:fastestmirror Loadingmirrorspeedsfromcachedhostfile *base:mirrors.yun-idc.com *epel:ftp.sjtu.edu.cn *extras:mirrors.yun-idc.com *updates:mirrors.yun-idc.com repoidreponamestatus base/7/x86_64CentOS-7-Base8,465 epel/x86_64ExtraPackagesforEnterpriseLinux7-x86_645,036 extras/7/x86_64CentOS-7-Extras30 updates/7/x86_64CentOS-7-Updates423 repolist:13,954 [root@Lixiaolong~]#
如何使用epel源安装软件？
例如想查看cacti信息
#yum--enablerepo=epelinfocacti
Sample Output
安装则执行以下命令：
#yum--enablerepo=epelinstallcacti
Note: Epel的配置文件在/etc/yum.repos.d/epel.repo.
转自：http://linux.it.net.cn/CentOS/course/2014/1214/10265.html
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