经常使用CentOS，已经很习惯它自带的yum，由于工作需要用到rhel（Red Hat Enterprise Linux），尽管CentOS和rhel具有同样的内核，但rhel默认并不支持（YUM是Redhat Linux在线安装更新及软件的工具，但是这是RHEL5的收费功能，如果没有购买Redhat的服务时不能使用RHEL5的更新源的，会提示注册）。由于CentOS是从Redhat演化而来的免费Linux版本，因此可以利用CentOS的yum更新源来实现RHEL5的YUM功能：

###一、建立yum安装包目录，并进入到该目录：

mkdir /usr/local/src/yum-packages （个人习惯将安装文件统一放在/usr/local/src/目录）

cd /usr/local/src/yum-packages

wget http://mirror.centos.org/centos-5/5/os/i386/CentOS/python-iniparse-0.2.3-4.el5.noarch.rpm

wget http://mirrors.sohu.com/centos/5.5/os/i386/CentOS/yum-3.2.22-26.el5.centos.noarch.rpm

wget http://mirrors.sohu.com/centos/5.5/os/i386/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm

wget http://mirror.centos.org/centos-5/5/os/i386/CentOS/yum-fastestmirror-1.1.16-14.el5.centos.1.noarch.rpm

###三、先安装python环境：

rpm -ivh python-iniparse-0.2.3-4.el5.noarch.rpm

###四、安装所有的yum包：

rpm -ivh yum-3.2.22-26.el5.centos.noarch.rpm yum-metadata-parser-1.1.2-3.el5.centos.i386.rpm yum-fastestmirror-1.1.16-14.el5.centos.1.noarch.rpm

###五、下载配置文件

wget http://centos.ustc.edu.cn/CentOS-Base.repo -O /etc/yum.repos.d/CentOS-Base.repo

还有一个源（http://sudone.com/download/CentOS-Base.repo ）

###六、执行

yum update

修改CentOS-Base.repo为

[base]
name=CentOS-5 - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever5&arch=$basearch&
repo=os
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
baseurl=http://ftp.sjtu.edu.cn/centos/5/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5

#released updates
[update]
name=CentOS-5 - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=updates
baseurl=http://ftp.sjtu.edu.cn/centos/5/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5

#packages used/produced in the build but not released
[addons]
name=CentOS-5 - Addons
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=addons

baseurl=http://ftp.sjtu.edu.cn/centos/5/addons/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5

#additional packages that may be useful
[extras]
name=CentOS-5 - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=extras

baseurl=http://ftp.sjtu.edu.cn/centos/5/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5 - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=centosplus
baseurl=http://ftp.sjtu.edu.cn/centos/5/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5

#contrib - packages by Centos Users
[contrib]
name=CentOS-5 - Contrib
#mirrorlist=http://mirrorlist.centos.org/?release=4&arch=$basearch&repo=contrib
baseurl=http://ftp.sjtu.edu.cn/centos/5/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-centos5

执行安装

[root@bogon yum-packages]# yum install postfix

报如下错误

Total download size: 3.7 M
Is this ok [y/N]: y
Downloading Packages:
postfix-2.3.3-2.1.el5_2.x86_64.rpm | 3.7 MB 02:17
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897

GPG key retrieval failed: [Errno 14] HTTP Error 404: Not Found

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

（注意：这里都是32位的）

再次安装成功

ITPub博客

RHEL5的yum安装配置

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