在CentOS 5.x 或者 6.x 上安装最新版的EPEL（比网易的源更新）

这文章太简单，大家只看我写中文的地方就可以了
 
Installing RHEL EPEL Repo on CentOS 5.x or 6.x

How to install RHEL EPEL repository on Centos 5.x or 6.x

The following article will describe how to configure a CentOS 5.x-based or Centos 6.x-based system to use Fedora Epel repos and third party remi package repos. These package repositories are not officially supported by CentOS, but they provide much more current versions of popular applications like PHP or MYSQL.
 
Install the extra repositories
 
The first step requires downloading some RPM files that contain the additional YUM repository definitions. The instructions below point to the 64-bit versions that work with our Cloud Server instances.
 
下面根据自己的版本挑选脚本去运行，比如你是CentOS 6.4 就用 CentOS 6.x
 
Centos 5.x
 wget http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
wget http://rpms.famillecollet.com/enterprise/remi-release-5.rpm
sudo rpm -Uvh remi-release-5*.rpm epel-release-5*.rpm
Centos 6.x
 wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
sudo rpm -Uvh remi-release-6*.rpm epel-release-6*.rpm
Once installed you should see some additional repo definitions under the /etc/yum.repos.d directory.
 
 安装完毕后去 remi.repo看下，如果出现以下三个文件就正常
 $ ls -1 /etc/yum.repos.d/epel* /etc/yum.repos.d/remi.repo
/etc/yum.repos.d/epel.repo
/etc/yum.repos.d/epel-testing.repo
/etc/yum.repos.d/remi.repo
 
Enable the remi repository 打开remi源
 
The remi repository provides a variety of up-to-date packages that are useful or are a requirement for many popular web-based services. That means it generally is not a bad idea to enable the remi repositories by default.
 
First, open the /etc/yum.repos.d/remi.repo repository file using a text editor of your choice:
 
用vim打开remi.repo文件
 sudo vim /etc/yum.repos.d/remi.repo
 
Edit the [remi] portion of the file so that the enabled option is set to 1. This will enable the remi repository.
 
将enabled那项修改为1
 name=Les RPM de remi pour Enterprise Linux $releasever - $basearch
#baseurl=http://rpms.famillecollet.com/enterprise/$releasever/remi/$basearch/
mirrorlist=http://rpms.famillecollet.com/enterprise/$releasever/remi/mirror
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
failovermethod=priority

You will now have a larger array of yum repositories from which to install.