由于CentOS是从Redhat演化而来的免费Linux版本，因此可以利用CentOS的yum更新源来实现RHEL5的YUM功能。配置方法如下：

检查yum是否安装，默认情况下都是安装好的，总共4各包。


  1. [root@linux-a ~]# rpm -qa |grep yum 
  3. yum-metadata-parser-1.0-8.fc6 
  5. yum-3.0.1-5.el5 
  7. yum-rhn-plugin-0.4.3-1.el5 
  9. yum-updatesd-3.0.1-5.el5



配置yum更新源

创建/etc/yum.repos.d/CentOS-Base.repo文件，定义yum更新源，这里使用的是上海交大的CentOS更新源


  1. [root@linux-a ~]# vi /etc/yum.repos.d/CentOS-Base.repo  
  2. [base] 
  3. name=centos-5 - Base 
  4. baseurl=http://centos.ustc.edu.cn/centos/5/os/i386/ 
  5. # the other site: http://centos.candishosting.com.cn/centos/5/os/i386/ 
  6. # you can find more site in: http://www.centos.org/modules/tinycontent/index.php?id=13
  7. enabled=1
  8. gpgcheck=1
  9. gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5 
  10. #released updates 
  11. [update] 
  12. name=CentOS-5 - Updates 
  13. baseurl=http://mirror.centos.org/centos/5/updates/i386/ 
  14. gpgcheck=1
  15. gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5 
  16. #packages used/produced in the build but not released 
  17. [addons] 
  18. name=CentOS-5 - Addons 
  19. baseurl=http://mirror.centos.org/centos/5/addons/$basearch/ 
  20. gpgcheck=1
  21. gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5 
  22. #additional packages that may be useful 
  23. [extras] 
  24. name=CentOS-5 - Extras 
  25. baseurl=http://mirror.centos.org/centos/5/extras/$basearch/ 
  26. gpgcheck=1
  27. gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos4 
  28. #additional packages that extend functionality of existing packages 
  29. [centosplus] 
  30. name=CentOS-5 - Plus 
  31. baseurl=http://mirror.centos.org/centos/5/centosplus/$basearch/ 
  32. gpgcheck=1
  33. enabled=0
  34. gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5 
  35. #contrib - packages by Centos Users 
  36. [contrib] 
  37. name=CentOS-5 - Contrib 
  38. baseurl=http://mirror.centos.org/centos/5/contrib/$basearch/ 
  39. gpgcheck=1
  40. enabled=0
  41. gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5 
  42. #packages in testing 
  43. [testing] 
  44. name=CentOS-5 - Testing 
  45. baseurl=http://mirror.centos.org/centos/5/testing/$basearch/ 
  46. gpgcheck=1
  47. enabled=0
  48. gpgkey=http://centos.ustc.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5


导入key

  1. [root@linux-a ~]# rpm --import http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5