1、删除RedHat原有的YUM（可以直接备份）

rpm -qa |grep yum #检测源

rpm -aq | grep yum|xargs rpm -e --nodeps #卸载原有源

2、下载centos下的yum源

wget http://vault.centos.org/5.9/os/x86_64/CentOS/yum-metadata-parser-1.1.2-4.el5.x86_64.rpm

wget http://vault.centos.org/5.9/os/x86_64/CentOS/python-iniparse-0.2.3-6.el5.noarch.rpm

wget http://vault.centos.org/5.9/os/x86_64/CentOS/yum-3.2.22-40.el5.centos.noarch.rpm

wget http://vault.centos.org/5.9/os/x86_64/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm

3、安装yum包

rpm -ivh yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm --nodeps --force

rpm -ivh yum-metadata-parser-1.1.2-4.el5.x86_64.rpm --nodeps --force

rpm -ivh python-iniparse-0.2.3-6.el5.noarch.rpm --nodeps --force

rpm -ivh yum-3.2.22-40.el5.centos.noarch.rpm --nodeps --force

4、修改RedHat.repo文件

[base]

name=CentOS-5.9 - Base

failovermethod=priority

baseurl=http://vault.centos.org/5.9/os/x86_64/

gpgcheck=1

gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

#released updates

[updates]

name=CentOS-5.9 - Updates

failovermethod=priority

baseurl=http://vault.centos.org/5.9/updates/x86_64/

gpgcheck=1

gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful

[extras]

name=CentOS-5.9 - Extras

failovermethod=priority

baseurl=http://vault.centos.org/5.9/extras/x86_64/

gpgcheck=1

gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages

[centosplus]

name=CentOS-5.9 - Plus

failovermethod=priority

baseurl=http://vault.centos.org/5.9/centosplus/x86_64/

gpgcheck=1

enabled=0

gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

#contrib - packages by Centos Users

[contrib]

name=CentOS-5.9 - Contrib

failovermethod=priority

baseurl=http://vault.centos.org/5.9/contrib/x86_64/

gpgcheck=1

enabled=0

gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

5、清楚缓存

yum clean all

6、获取配置YUM列表

yum makecache