[root@lvs-master ~]# rpm -qa |grep yum 
yum-metadata-parser-2-el5 
yum-updatesd-9-el5 
yum-22-el5 
yum-security-16-el5 
yum-rhn-plugin-4-el5 

[base] 
name=CentOS-5-Base 
#mirrorlist=http://mirrorlistcentosorg/?release=$releasever5&arch=$basearch&repo=os 
#baseurl=http://mirrorcentosorg/centos/$releasever/os/$basearch/ 
baseurl=http://ftpsjtueducn/centos/5/os/$basearch/ 
gpgcheck=1 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-centos5 
#released updates 
[update] 
name=CentOS-5-Updates 
#mirrorlist=http://mirrorlistcentosorg/?release=4&arch=$basearch&repo=updates 
baseurl=http://ftpsjtueducn/centos/5/updates/$basearch/ 
gpgcheck=1 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-centos5 
#packages used/produced in the build but not released 
[addons] 
name=CentOS-5-Addons 
#mirrorlist=http://mirrorlistcentosorg/?release=4&arch=$basearch&repo=addons 
baseurl=http://ftpsjtueducn/centos/5/addons/$basearch/ 
gpgcheck=1 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-centos5 
#additional packages that may be useful 
[extras] 
name=CentOS-5-Extras 
#mirrorlist=http://mirrorlistcentosorg/?release=4&arch=$basearch&repo=extras 
baseurl=http://ftpsjtueducn/centos/5/extras/$basearch/ 
gpgcheck=1 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-centos5 
#additional packages that extend functionality of existing packages 
[centosplus] 
name=CentOS-5-Plus 
#mirrorlist=http://mirrorlistcentosorg/?release=4&arch=$basearch&repo=centosplus 
baseurl=http://ftpsjtueducn/centos/5/centosplus/$basearch/ 
gpgcheck=1 
enabled=0 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-centos5 
#contrib - packages by Centos Users 
[contrib] 
name=CentOS-5-Contrib 
#mirrorlist=http://mirrorlistcentosorg/?release=4&arch=$basearch&repo=contrib 
baseurl=http://ftpsjtueducn/centos/5/contrib/$basearch/ 
gpgcheck=1 
enabled=0 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-centos5 
# vi dagrepo 
[dag] 
name=Dag RPM Repository for RHEL5 
baseurl=http://ftprikenjp/Linux/dag/redhat/el5/en/$basearch/dag/ 
enabled=1 
gpgcheck=1 
gpgkey=http://ftprikenjp/Linux/dag/packages/RPM-GPG-KEYdagtxt 

＃rpm --import http://ftp.sjtu.edu.cn/centos/5/os/i386/RPM-GPG-KEY-CentOS-5 

＃yum update 

#yum clean all 

# cd /etc/yum.repos.d/ 
#mv CentOS-Baserepo CentOS-Baserepobak 
#wget http://docslinuxtoneorg/soft/lemp/CentOS-Baserepo 
该文件内容如下： 
[base] 
name=CentOS-5 - Base 
baseurl=http://centosustceducn/centos/5/os/$basearch/ 
gpgcheck=1 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-CentOS-5 
#released updates 
[update] 
name=CentOS-5 - Updates 
baseurl=http://centosustceducn/centos/5/updates/$basearch/ 
gpgcheck=1 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-CentOS-5 
#packages used/produced in the build but not released 
[addons] 
name=CentOS-5 - Addons 
baseurl=http://centosustceducn/centos/5/addons/$basearch/ 
gpgcheck=1 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-CentOS-5 
#additional packages that may be useful 
[extras] 
name=CentOS-5 - Extras 
baseurl=http://centosustceducn/centos/5/extras/$basearch/ 
gpgcheck=1 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-CentOS-5 
#additional packages that extend functionality of existing packages 
[centosplus] 
name=CentOS-5 - Plus 
baseurl=http://centosustceducn/centos/5/centosplus/$basearch/ 
gpgcheck=1 
enabled=0 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-CentOS-5 
#contrib - packages by Centos Users 
[contrib] 
name=CentOS-5 - Contrib 
baseurl=http://centosustceducn/centos/5/contrib/$basearch/ 
gpgcheck=1 
enabled=0 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-CentOS-5 
#packages in testing 
[testing] 
name=CentOS-5 - Testing 
baseurl=http://centosustceducn/centos/5/testing/$basearch/ 
gpgcheck=1 
enabled=0 
gpgkey=http://mirrorcentosorg/centos/RPM-GPG-KEY-CentOS-5