[root@localhost~]# wget http://mirrors.163.com/.help/CentOS5-Base-163.repo

[root@localhost ~]# ll

[root@localhost~]# mv CentOS5-Base-163.repo /etc/yum.repos.d/

把$releasever替换成5

[root@localhostyum.repos.d]# cat CentOS5-Base-163.repo

# CentOS-Base.repo

#

# The mirror system uses the connecting IP addressof the client and the

# update status of each mirror to pick mirrors thatare updated to and

# geographically close to the client.  You should use this for CentOS updates

# unless you are manually picking other mirrors.

#

# If the mirrorlist= does not work for you, as afall back you can try the

# remarked out baseurl= line instead.

#

#

[base]

name=CentOS-5 - Base- 163.com

baseurl=http://mirrors.163.com/centos/5/os/$basearch/

#mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=os

gpgcheck=1

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

#released updates

[updates]

name=CentOS-5 - Updates - 163.com

baseurl=http://mirrors.163.com/centos/5/updates/$basearch/

#mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=updates

gpgcheck=1

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

#packages used/produced in the build but notreleased

[addons]

name=CentOS-5 - Addons - 163.com

baseurl=http://mirrors.163.com/centos/5/addons/$basearch/

#mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=addons

gpgcheck=1

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

#additional packages that may be useful

[extras]

name=CentOS-5 - Extras - 163.com

baseurl=http://mirrors.163.com/centos/5/extras/$basearch/

#mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=extras

gpgcheck=1

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

#additional packages that extend functionality ofexisting packages

[centosplus]

name=CentOS-5 - Plus - 163.com

baseurl=http://mirrors.163.com/centos/5/centosplus/$basearch/

#mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=centosplus

gpgcheck=1

enabled=0

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

#contrib - packages by Centos Users

[contrib]

name=CentOS-5 - Contrib - 163.com

baseurl=http://mirrors.163.com/centos/5/contrib/$basearch/

#mirrorlist=http://mirrorlist.centos.org/?release=5&arch=$basearch&repo=contrib

gpgcheck=1

enabled=0

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

[root@localhost yum.repos.d]#

#清除原有缓存

[root@localhostyum.repos.d]# yum clean all

#获取yum列表

[root@localhostyum.repos.d]# yum makecache