CentOS自帶的yum源中rpm包數量有限，很多時候找不到需的軟件包，，下面在CentOS 6.2中（以64位系統為例，32位系統安裝方法一樣），使用第三方yum源來安裝更多軟件包。
一、安裝CentOS yum源優先級插件yum-priorities
yum install yum-priorities #輸入y安裝
二、設置CentOS默認yum源的優先級為最高
cd /etc/yum.repos.d/ #進入yum源目錄
vi CentOS-Base.repo #在[base]、[updates]、[extras]組下面添加priority=1，在[centosplus]、[contrib]組下面添加priority=2
################################################################
[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
priority=1
[updates]
name=CentOS-$releasever - Updates
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
#baseurl=http://mirror.centos.org/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
priority=1
[extras]
name=CentOS-$releasever - Extras
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
#baseurl=http://mirror.centos.org/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
priority=1
[centosplus]
name=CentOS-$releasever - Plus
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
priority=2
[contrib]
name=CentOS-$releasever - Contrib
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
priority=2
###############################################################
備注：priority的優先級為1到99，設置為1即優先級最高，1-10為系統保留，第三方yum源的優先級從11-99
三、安裝epel yum源
rpm -ivh ftp://ftp.muug.mb.ca/mirror/fedora/epel/6/x86_64/epel-release-6-5.noarch.rpm
PS:很多rpm均可在http://rpm.pbone.net找到對應的版本
rpm -ivh http://download.fedora.redhat.com/pub/epel/6/i386/epel-release-6-5.noarch.rpm（這個是32位系統的）
以上的2個注意系統是32還是64
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
vi /etc/yum.repos.d/epel.repo #修改epel yum源優先級，priority=11
###############################################################
[epel]
name=Extra Packages for Enterprise Linux 6 - $basearch
#baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
priority=11
#################################################################
四、安裝remi yum源
rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
導入key：
rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-remi
默認會在/etc/yum.repos.d/下創建remi.repo配置文件，remi.repo的內容如下：
[remi]
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=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
failovermethod=priority
priority=12 #修改remi yum源優先級，priority=12
[remi-test]
name=Les RPM de remi en test pour Enterprise Linux $releasever - $basearch
#baseurl=http://rpms.famillecollet.com/enterprise/$releasever/test/$basearch/
mirrorlist=http://rpms.famillecollet.com/enterprise/$releasever/test/mirror
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi
在升級軟件如果提示優先級不夠而要一定升級可以備份CentOS-Base.repo后將其刪除掉。