yum 失败（This system is not registered with RHN.）解决方法

转自：http://blog.csdn.net/linuxoostudy/article/details/7076420

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@localhost ~]# rpm -qa|grep yum|xargs rpm -e --nodeps

2.安装centos的yum包 如果是64位的，要到 http://mirrors.ustc.edu.cn/centos/5/os/x86_64/CentOS/ 这个路径去找对应的rpm

[root@localhost ~]# wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm
[root@localhost ~]# wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-fastestmirror-1.1.16-16.el5.centos.noarch.rpm
[root@localhost ~]# wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-3.2.22-37.el5.centos.noarch.rpm
[root@localhost ~]# rpm -ivh *.rpm

warning: yum-3.2.22-37.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@localhost ~]# wget http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo
[root@localhost ~]#mv CentOS_Base.repo /etc/yum.repos.d/CentOS-Base.repo

4.生成缓存并进行安装

[root@localhost ~]# yum makecache

[root@localhost ~]# yum install httpd

yum install vim*