追风之云

查看系统内核版本
# uname -a
Linux localhost.localdomain 2.6.18-8.el5 #1 SMP Fri Jan 26 14:15:21 EST 2007 i686 i686 i386 GNU/Linux

# cat /proc/version
Linux version 2.6.18-8.el5 (brewbuilder@ls20-bc2-14.build.redhat.com) (gcc version 4.1.1 20070105 (Red Hat 4.1.1-52)) #1 SMP Fri Jan 26 14:15:21 EST 2007

查看linux版本
# lsb_release -a
LSB Version: :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: RedHatEnterpriseServer
Description: Red Hat Enterprise Linux Server release 5 (Tikanga)
Release: 5
Codename: Tikanga

先把yum删掉
# rpm -qa|grep yum
yum-metadata-parser-1.0-8.fc6
yum-3.0.1-5.el5
yum-updatesd-3.0.1-5.el5
yum-rhn-plugin-0.4.3-1.el5


yum remove yum-rhn-plugin-0.4.3-1.el5
yum remove yum-updatesd-3.0.1-5.el5
rpm -e yum
rpm -e yum-metadata-parser-1.0-8.fc6
rpm -e redhat-release-notes-5Server-5

从CentOS 5.4的光盘中复制如下文件到系统中安装
rpm -ivh python-iniparse-0.2.3-4.el5.noarch.rpm
rpm -ivh libxml2-2.6.26-2.1.2.8.i386.rpm
rpm -ivh yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm
#rpm -ivh yum-3.2.22-20.el5.centos.noarch.rpm --nodeps
#rpm -ivh yum-fastestmirror-1.1.16-13.el5.centos.noarch.rpm
以上2个安装时相互依赖，可以试下同时安装
rpm -ivh yum-3.2.22-20.el5.centos.noarch.rpm yum-fastestmirror-1.1.16-13.el5.centos.noarch.rpm

rpm -ivh centos-release-notes-5.4-4.i386.rpm
#rpm -e redhat-logos --nodeps
rpm -e redhat-release-5Server-5.0.0.9 --nodeps
rpm -ivh centos-release-5-4.el5.centos.1.i386.rpm

加入更新源，如需指定安装版本可使用
baseurl=http://vault.centos.org/5.4/updates/i386/
yum update --skip-broken
=========================================================================================================
Install 3 Package(s)
Update 55 Package(s)
Remove 0 Package(s)

Total download size: 74 M
Is this ok [y/N]: y

量新到最新版
# vi /etc/yum.conf
[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

用yum进行更新
# yum update
Transaction Summary
=========================================================================================================
Install 35 Package(s)
Update 310 Package(s)
Remove 0 Package(s)
Total download size: 341 M
Is this ok [y/N]: y

网速好的话稍等会就可以看到更新完成，重启，即可看到CentOS 5了

参考
将 RHEL 5.4 升级为 CentOS 5.5
http://anylinux.net/post/2166.html
RHEL 5.3升级为Centos 5.4
http://crazyming.blog.51cto.com/1048571/326302
CentOS 5.4 yum 更新国内镜像
http://lxsym.blog.51cto.com/1364623/289059
[Linux]CentOS4 升级到 CentOS5
http://www.php-oa.com/2009/06/29/centos4-to-centos5.html