查看当前系统版本号

[root@localhost ~]# less /etc/redhat-release

检查系统已安装的组件包中是否已存在Redhat的自带的yum系列组件包

[root@localhost ~]# rpm -qa | grep yum

yum-metadata-parser-1.0-8.fc6

yum-3.0.1-5.el5

yum-updatesd-3.0.1-5.el5

yum-rhn-plugin-0.4.3-1.el5

如果存在请逐一全部删除

[root@localhost ~]# rpm -e --nodeps yum-metadata-parser-1.0-8.fc6 yum-3.0.1-5.el5 yum-updatesd-3.0.1-5.el5 yum-rhn-plugin-0.4.3-1.el5

建立Centos专用目录，然后下载并安装Centos系统的yum系列组件包

[root@localhost ~]# mkdir webuser

[root@localhost ~]# cd webuser

[root@localhost webuser]# wget http://ftp.sjtu.edu.cn/centos/5/os/i386/CentOS/yum-3.2.22-26.el5.centos.noarch.rpm

[root@localhost webuser]# wget http://ftp.sjtu.edu.cn/centos/5/os/i386/CentOS/yum-fastestmirror-1.1.16-14.el5.centos.1.noarch.rpm

[root@localhost webuser]# wget http://ftp.sjtu.edu.cn/centos/5/os/i386/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm

[root@localhost webuser]# wget http://ftp.sjtu.edu.cn/centos/5/os/i386/CentOS/yum-updatesd-0.9-2.el5.noarch.rpm

[root@localhost webuser]# wget http://ftp.sjtu.edu.cn/centos/5/os/i386/CentOS/python-iniparse-0.2.3-4.el5.noarch.rpm

[root@localhost webuser]# wget http://ftp.sjtu.edu.cn/centos/RPM-GPG-KEY-CentOS-5 

安装Centos升级组件包

[root@localhost webuser]# rpm -Uvh --nodeps *.rpm

Preparing...                ########################################### [100%]

   1:yum-updatesd           ########################################### [ 20%]

   2:python-iniparse        ########################################### [ 40%]

   3:yum                    ########################################### [ 60%]

   4:yum-fastestmirror      ########################################### [ 80%]

   5:yum-metadata-parser    ########################################### [100%]

导入Centos升级组件授权

[root@localhost webuser]# rpm -import RPM-GPG-KEY-CentOS-5

创建并编辑yum升级源配置文件

[root@localhost webuser]# mkdir -p /etc/yum.repos.d/

[root@localhost webuser]# vi /etc/yum.repos.d/CentOS-Base.repo

安装图形化的升级软件

[root@localhost webuser]# yum install yumex

本文出自 “梦女孩” 博客，谢绝转载！

RedHat EL5 CentOS更新