修改RedHat的yum源为CentOS的yum源

今天需要用一个Linux系统做个测试，手头只有RHEL 5.4的光盘，装完以后，使用redhat系统在线安装时提示This system is not registered with RHN.如下：

[root@localhost ~]# yum install httpd
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Install Process
No package httpd available.
Nothing to do
解决方案：

1.卸载redhat自带的yum组件

[root@ser38 ~]# rpm -qa|grep yum|xargs rpm -e --nodeps

2.安装centos的yum包（32位/64位系统的下载包以及路径都不一样，我是64位系统对应于64位安装包）

[root@ser38 ~]# wget  http://centos.ustc.edu.cn/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm

[root@ser38 ~]# wget  http://centos.ustc.edu.cn/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm

[root@ser38 ~]# wget  http://centos.ustc.edu.cn/centos/5/os/x86_64/CentOS/yum-3.2.22-39.el5.centos.noarch.rpm

[root@ser38 ~]# rpm -ivh *.rpm

warning: yum-3.2.22-39.el5.centos.noarch.rpm: Header V3 DSA signature: NOKEY, key ID e8562897
Preparing...                ########################################### [100%]
   1:yum-metadata-parser    ########################################### [ 33%]
   2:yum-fastestmirror      ########################################### [ 67%]
   3:yum                    ########################################### [100%]

3. 下载更新源，并存放在系统目录中
[root@ser38 ~]# wget http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo

[root@ser38 ~]#mv CentOS_Base.repo /etc/yum.repos.d/CentOS-Base.repo

4.生成缓存并进行安装

[root@ser38 ~]# yum makecache
[root@ser38 ~]# yum install httpd