redhat默认是使用rpm安装，我们可以更改使用centos的yum网络源来进行安装。
一、删除redhat的yum所有组件
rpm -qa | grep yum | xargs rpm -e --nodeps #用--nodeps参数强制删除
二、下载yum组件
请查看附件下载
三、按照顺序安装下载的rpm包
rpm -ivh python-iniparse-0.2.3-4.el5.noarch.rpm &&
rpm -ivh yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm &&
rpm -ivh yum-3.2.22-26.el5.centos.noarch.rpm &&
yum-fastestmirror-1.1.16-14.el5.centos.1.noarch.rpm
四、创建yum的配置文件
vim /etc/yum.repos.d/CentOS-Base.repo
复制以下内容到该文件，保存即可完成。
[base]
name=CentOS-5 - Base
baseurl=http://centos.ustc.edu.cn/centos/5/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#released updates
[update]
name=CentOS-5 - Updates
baseurl=http://centos.ustc.edu.cn/centos/5/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#packages used/produced in the build but not released
[addons]
name=CentOS-5 - Addons
baseurl=http://centos.ustc.edu.cn/centos/5/addons/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful
[extras]
name=CentOS-5 - Extras
baseurl=http://centos.ustc.edu.cn/centos/5/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5 - Plus
baseurl=http://centos.ustc.edu.cn/centos/5/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#contrib - packages by Centos Users
[contrib]
name=CentOS-5 - Contrib
baseurl=http://centos.ustc.edu.cn/centos/5/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
#packages in testing
[testing]
name=CentOS-5 - Testing
baseurl=http://centos.ustc.edu.cn/centos/5/testing/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
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RHEL5.4_yum网络源配置,布布扣,bubuko.com
原文：http://yueying.blog.51cto.com/1074742/1387755