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默认centos自带的源少了很多好软件，所以需要添加第三方源
一、安装CentOS yum源优先级插件yum-priorities yum install yum-plugin-priorities.noarch
二、设置CentOS默认yum源的优先级为最高 cd /etc/yum.repos.d/ #进入yum源目录 vi CentOS-Base.repo #在[base]、[updates]、[extras]组下面添加priority=1，在[centosplus]、[contrib]组下面添加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 ############################################################### 备注：priority的优先级为1到99，设置为1即优先级最高，1-10为系统保留，第三方yum源的优先级从11-99
当 Fedora 项目的维护人员发现可以采用管理 Fedora 项目的方法，来管理针对企业版 Linux 的附加软件包项目时，一个新的伟大的项目诞生了！项目诞生之初只是加入了一些在 RHEL 维护 Fedora 的工具。随着时间的发展，EPEL 仓库越来越丰富，成为一个大型的软件收集仓库
[root@localhost tmp]# wget http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
正在解析主机 dl.fedoraproject.org... 209.132.181.24, 209.132.181.25, 209.132.181.26, ...CentOS-Debuginfo.repo CentOS-Vault.repo epel-testing.repo
vi /etc/yum.repos.d/epel.repo （具体根据实际源目录地址，注意字母大小写，有的CENTOS系统是大小写交叉的）
#修改epel yum源优先级，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安装atomic yum源
wget http://www.atomicorp.com/installers/atomic #下载 sh ./atomic #安装 vi /etc/yum.repos.d/atomic.repo #修改atomic yum源优先级，priority=12 ############################################################## [atomic] name = CentOS / Red Hat Enterprise Linux $releasever - atomicrocketturtle.com mirrorlist = http://www.atomicorp.com/mirrorlist/atomic/centos-6-$basearch #mirrorlist = http://www.atomicorp.com/channels/atomic/centos/6/mirrors-atomic enabled = 1 priority = 1 protect = 0 gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY.art.txt gpgcheck = 1 priority=12 ############################################################## 添加163+网易源使用如下方法：首先备份/etc/yum.repos.d/CentOS-Base.repo Mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup 下载对应版本repo文件, 放入/etc/yum.repos.d/(操作前请做好相应备份) 当然更简单的办法是wget wget http://mirrors.163.com/.help/CentOS5-Base-163.repo wget http://mirrors.sohu.com/help/CentOS-Base-sohu.repo 然后运行yum makecache生成缓存
最后安装好第三方源时记得 更新yum软件包 yum check-update
来源：http://blog.csdn.net/zqtsx/article/details/39207069