redhat 更改源 使用yum命令

1.卸载rhel的默认安装的yum包
查看yum包
rpm -qa|grep yum
卸载之
rpm -qa|grep yum|xargs rpm -e --nodeps
2.下载新的yum包
Wget http://mirrors.163.com/centos/5/os/i386/CentOS/yum-3.2.22-37.el5.centos.noarch.rpm
Wget http://mirrors.163.com/centos/5/os/i386/CentOS/yum-fastestmirror-1.1.16-16.el5.centos.noarch.rpm
Wget http://mirrors.163.com/centos/5/os/i386/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm
3.安装
rpm -ivh yum-*
注意：yum和yum-fastestmirror相互依赖，所以同时安装即可。
4.下载yum的配置源
wget http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo

把CentOS-Base.repo 放到/etc/yum.repos.d/ 目录下面
5.运行yum makecache生成缓存
这样就可以使用YUM了。
系统环境：
[root@localhost ~]# lsb_release -a
LSB Version:    :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: RedHatEnterpriseServer
Description:    Red Hat Enterprise Linux Server release 5.4 (Tikanga)
Release:        5.4
Codename:       Tikanga