由于RedHat是商业版的，通常由于没有注册，导致yum程序无法使用（linux下面，yum是个安装软件的“神器”）。此时可用CentOS的地址进行替换。下面将一步步说明如何处理：
一、删除RedHat自带的yum相关文件
1、文件位置：/etc/yum.conf和/etc/yum.repo.d/rhel-debuginfo.repo；
2、可以通过FTP方式删除，或者直接采用命令。
二、重新配置yum相关文件
1、配置yum.conf,创建yum.conf文件，再进行编辑即可；
yum.conf内容，可直接拷贝，如下：
[main] cachedir=/var/cache/yum keepcache=1 debuglevel=2 logfile=/var/log/yum.log pkgpolicy=newest distroverpkg=redhat-release tolerant=1 exactarch=1 obsoletes=1 gpgcheck=1 plugins=1 metadata_expire=1800
粘贴完成后，保存后即可。可通过命令查看，是否一致。
2、配置rhel-debuginfo.repo,创建rhel-debuginfo.repo文件，再进行编辑即可（本文以CentOS5 64位地址为准），具体操作，同1，这里只把内容展示如下：
[base] name=centos-5 - Base baseurl=http://centos.ustc.edu.cn/centos/5/os/x86_64/ # the other site: # you can find more site in: ?id=13 enabled=1 gpgcheck=1 gpgkey http://centos.ustc.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5 #released updates [update] name=CentOS-5 - Updates baseurl=http://mirror.centos.org/centos/5/updates/x86_64/ gpgcheck=1 gpgkey=http://centos.ustc.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5 #packages used/produced in the build but not released [addons] name=CentOS-5 - Addons baseurl=http://mirror.centos.org/centos/5/addons/$basearch/ gpgcheck=1 gpgkey=http://centos.ustc.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5 #additional packages that may be useful [extras] name=CentOS-5 - Extras baseurl=http://mirror.centos.org/centos/5/extras/$basearch/ gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-5 - Plus baseurl=http://mirror.centos.org/centos/5/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://centos.ustc.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5 #contrib - packages by Centos Users [contrib] name=CentOS-5 - Contrib baseurl=http://mirror.centos.org/centos/5/contrib/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://centos.ustc.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5 #packages in testing [testing] name=CentOS-5 - Testing baseurl=http://mirror.centos.org/centos/5/testing/$basearch/ gpgcheck=1 enabled=0 gpgkey=http://centos.ustc.edu.cn/centos/5/os/x86_64/RPM-GPG-KEY-CentOS-5
备注：如果是32为系统，只需把X86_64全部替换成i386即可。