修改CentOS 5.6的源

$su - root

#cd /etc/yum.repos.d/

#cp CentOS-Base.repo CentOS-Base.repo.bak

#vi CentOS-Base.repo

修改原文为：

[base]

name=CentOS-$releasever-Base

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

gpgcheck=1

gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-5

#released updates

[updates]

name=CentOS-$releasever-Updates

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

gpgcheck=1

gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-5

#packages used/produced in the build but not released

[addons]

name=CentOS-$releasever-Addons

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

gpgcheck=1

gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful

[extras]

name=CentOS-$releasever-Extras

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

gpgcheck=1

gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages

[centosplus]

name=CentOS-$releasever-Plus

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

gpgcheck=1

enabled=0

gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS

If you don't want to update kernel

#vi /etc/yum.conf

Add a line to [MAIN] part:

exclude=kernel*

#yum update