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
