使用Redhat系统在线安装(执行yum)时报错: This system is not registered with RHN.

解决方法:

1. 卸载redhat自带的yum组件:

    1.1.查看当前安装的yum包:

           #rpm -qa|grep yum

     1.2.卸载当前安装的yum包:

           #rpm -qa|grep yum|xargs rpm -e --nodeps

     1.3. 用1.1步骤的命令检查,所有yum包都已成功卸载

2. 下载CentOS的yum包:

     #wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm

     #wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm

     #wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-3.2.22-39.el5.centos.noarch.rpm

3. 安装CentOS的yum包:

     //注意,在安装的时候几个rpm包要同时安装,如果分别安装会出现依赖性问题

     #rpm -ivh *.rpm

4. 下载更新资源,并存放在系统目录中

     #wget http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo

     #mv CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo

5. 生成缓存,并且进行安装

    #yum makecache

    #yum install libstdc++.so.5

    #yum install glibc.i686

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