centos是一个根据rhel rebuild的版本,它的目录结构,文件命名,所有软件包都跟rhel是完全兼容的,因此,我们完全可以用centos的apt和yum源来进行系统和软件更新.
apt下载页面：http://dag.wieers.com/packages/apt/
[root@netgate ~]#
wget http://dag.wieers.com/packages/apt/apt-0.5.15lorg3.1-4.el4.rf.i386.rpm
...
[root@netgate ~]# rpm -ivh apt-0.5.15lorg3.1-4.el4.rf.i386.rpm
Preparing... ########################################### [100%]
1:apt ########################################### [100%]
[root@netgate ~]#
wget http://dag.wieers.com/packages/rpmforge-release/rpmforge-release-0.3.4-1.el4.rf.i386.rpm
[root@netgate ~]# rpm -Uvh rpmforge-release-0.3.4-1.el4.rf.i386.rpm
Preparing... ########################################### [100%]
package rpmforge-release-0.3.4-1.el4.rf is already installed
升级信息：
[root@netgate ~]# apt-get update
Get:1 http://apt.sw.be redhat/el4/en/i386/dag repomd.xml [1128B]
Fetched 1128B in 1s (833B/s)
Get:1 http://apt.sw.be redhat/el4/en/i386/dag/ primary.xml [1244kB]
Get:2 http://apt.sw.be redhat/el4/en/i386/dag/ filelists.xml [1592kB]
Fetched 2836kB in 2m13s (21.2kB/s)
Reading Package Lists... Done
Building Dependency Tree... Done
系统升级：
[root@netgate ~]# apt-get upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages will be upgraded
apt convmv freetype freetype-devel mtr nmap python-elementtree
python-urlgrabber rsync syslinux xrestop yum
The following packages have been kept back
lftp
12 upgraded, 0 newly installed, 0 removed and 1 not upgraded.
Need to get 4685kB of archives.
After unpacking 2767kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
...
相关文件信息：
[root@backhost sources.list.d]# pwd
/etc/apt/sources.list.d
[root@backhost sources.list.d]# ll
total 16
-rw-r--r-- 1 root root 951 Nov 30 10:28 os.list
-rw-r--r-- 1 root root 207 Jan 18 2007 rpmforge.list
[root@backhost sources.list.d]# vi os.list
# Name: Operating system and updates
### Red Hat Enterprise Linux
#repomd http://mirror.centos.org centos/$(VERSION)/os/$(ARCH)
#repomd http://mirror.centos.org centos/$(VERSION)/updates/$(ARCH)
#repomd http://mirror.centos.org centos/$(VERSION)/extras/$(ARCH)
#repomd http://mirror.centos.org centos/$(VERSION)/fasttrack/$(ARCH)
#repomd http://mrepo rhel$(VERSION)s-$(ARCH)/RPMS.os
#repomd http://mrepo rhel$(VERSION)s-$(ARCH)/RPMS.updates
#rpm http://mrepo rhel$(VERSION)s-$(ARCH) os updates
### Fedora Core Linux
#repomd http://ayo.freshrpms.net fedora/linux/$(VERSION)/$(ARCH)/core
#repomd http://ayo.freshrpms.net fedora/linux/$(VERSION)/$(ARCH)/updates
#rpm http://ayo.freshrpms.net fedora/linux/$(VERSION)/$(ARCH) core updates
### Red Hat Linux
#repomd http://ayo.freshrpms.net redhat/$(VERSION)/$(ARCH)/os
#repomd http://ayo.freshrpms.net redhat/$(VERSION)/$(ARCH)/updates
#rpm http://ayo.freshrpms.net redhat/$(VERSION)/$(ARCH) os updates
[root@backhost sources.list.d]# vi rpmforge.list
# Name: RPMforge RPM Repository for Red Hat Enterprise 4 - dag
# URL: http://rpmforge.net/
#rpm http://apt.sw.be redhat/el$(VERSION)/en/$(ARCH) dag
repomd http://apt.sw.be redhat/el$(VERSION)/en/$(ARCH)/dag
下载yum软件包：
http://www.chinalinuxpub.com/yum.tgz
tar zxvf yum.tgz
cd yum
rpm -ivh *.rpm
用的是centos的yum包，用这个yum就可以在线用centos升级rhel4了
安装完成后执行：
rm -rf /etc/yum.repos.d/CentOS-Base.repo
vi /etc/yum.repos.d/as4-update.repo
加入：
#released updates
[update]
name=Red Hat Enterprise AS release 4 Updates
baseurl=http://centos.ustc.edu.cn/centos/4/updates/i386/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-centos4
vi /etc/yum.repos.d/as4-base.repo
加入：
#released base
[base]
name=Red Hat Enterprise AS release 4 Updates
baseurl=http://centos.ustc.edu.cn/centos/4/os/i386/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/4/os/i386/RPM-GPG-KEY
保存然后就可以用yum升级AS4了
yum upgrade
…
Transaction Summary
===================================================
Install 27 Package(s)
Update 372 Package(s)
Remove 0 Package(s)
Total download size: 474 M
Is this ok [y/N]: y
Downloading Packages:
(1/399): system-config-pr 100% |=================| 108 kB 00:03
(2/399): perl-Filter-1.34 100% |=================| 156 kB 00:15
…
升级完成重启后，操作系统的外观也会发生变化。