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PS：EPEL的yum源是很稳定的第三方yum安装源，也是我经常使用的，基于CentOS/RHEL 7.x的也有了，整理如下：
# wget http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/epel-release-7-0.2.noarch.rpm
# yum install epel-release-7-0.2.noarch.rpm
或者
# rpm -ivh epel-release-7-0.2.noarch.rpm
验证查看是否安装成功：
yum repolist
查看某个包的详细信息：
yum --enablerepo=epel info htop
列出epel源的所有包列表：
yum --disablerepo="*" --enablerepo="epel" list available | less
附：
1、RHEL/CentOS 6.x的EPEL源安装方法：
## RHEL/CentOS 6 32-Bit ##
# wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm
## RHEL/CentOS 6 64-Bit ##
# wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm
2、RHEL/CentOS 5.x的EPEL源安装方法：
## RHEL/CentOS 5 32-Bit ##
# wget http://download.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
# rpm -ivh epel-release-5-4.noarch.rpm
## RHEL/CentOS 5 64-Bit ##
# wget http://download.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
# rpm -ivh epel-release-5-4.noarch.rpm
安装RPMForege源
64位系统：
wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm
rpm -ivh rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm
32位的系统：
wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm
rpm -ivh rpmforge-release-0.5.2-2.el5.rf.i386.rpm
# 也可以到 http://packages.sw.be/rpmforge-release/去寻找合适的RPMForege-Release安装包
