CentOS6使用第三方yum源安装更多rpm软件包

引言： 
      CentOS自带的yum源中rpm包数量有限，很多时候找不到我们需的软件包，（例如：要安装网络连接查看软件iftop，默认设置下无法使用yum命令安装），下面教大家在CentOS 6.2中（以32位系统为例，64位系统安装方法一样），使用第三方yum源来安装更多软件包。

一、安装CentOS yum源优先级插件yum-priorities 
      yum install yum-priorities   #输入y安装 
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 
三、安装epel yum源 
    rpm -ivh  http://download.fedora.redhat.com/pub/epel/6/i386/epel-release-6-5.noarch.rpm 
    rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6 
    vi /etc/yum.repos.d/epel.repo   #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 
################################################################# 
四、安装rpmforge yum源 
   wget http://apt.sw.be/redhat/el6/en/i386/rpmforge/RPMS/rpmforge-release-0.5.2-2.el6.rf.i686.rpm 
   wget http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt 
   rpm --import RPM-GPG-KEY.dag.txt 
   rpm -ivh rpmforge-release-0.5.2-2.el6.rf.i686.rpm 
   vi  /etc/yum.repos.d/rpmforge.repo  #修改rpmforge yum源优先级，priority=12 
  
################################################################# 
[rpmforge] 
name = RHEL $releasever - RPMforge.net - dag 
baseurl = http://apt.sw.be/redhat/el6/en/$basearch/rpmforge 
mirrorlist = http://apt.sw.be/redhat/el6/en/mirrors-rpmforge 
#mirrorlist = file:///etc/yum.repos.d/mirrors-rpmforge 
enabled = 1 
protect = 0 
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag 
gpgcheck = 1 
priority=12 
################################################################# 
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五、安装rpmfusion yum源 
   rpm -ivh http://download1.rpmfusion.org/free/el/updates/testing/6/i386/rpmfusion-free-release-6-0.1.noarch.rpm 
   vi  /etc/yum.repos.d/rpmfusion-free-updates-testing.repo   #修改rpmfusion yum源优先级，priority=13

################################################################# 
[rpmfusion-free-updates-testing] 
name=RPM Fusion for EL 6 - Free - Test Updates 
#baseurl=http://download1.rpmfusion.org/free/el/updates/testing/6/$basearch/ 
mirrorlist=http://mirrors.rpmfusion.org/mirrorlist?repo=free-el-updates-testing-6&arch=$basearch 
enabled=1 
gpgcheck=1 
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-free-el-6 
priority=13 
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################################################################# 
六、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=14 
############################################################## 
[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=14 
############################################################## 
七、更新yum软件包 
       yum check-update 
八、安装iftop 
       yum install iftop 
至此，CentOS 第三方yum源配置完成，现在你可以用yum命令安装自己需要的软件了！比如yum install nginx、yum update php等安装或者升级软件包。 
######################################################################################   
   扩展阅读： 
   在使用yum update php命令升级php的同时，mysql也被升级到了最新版，升级好之后重启mysql，有可能会出现下面 
   的错误信息，导致mysql启动失败。 
   ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2) 
   解决方法（切忌操作前备份mysql数据库）： 
   rm -fr /var/lib/mysql/*      #删除目录 
   rm /var/lock/subsys/mysqld   #删除目录 
   killall mysqld   #结束mysql进程 
   service mysqld start  #启动mysql 
   /etc/rc.d/init.d/mysqld status   #查看mysql状态 
   mysql_secure_installation  #重置Mysql数据库密码 
#####################################################################################

原文：http://www.cnblogs.com/lidabo/p/3933883.html