LNMP一键安装包是微魔常 用的一键安装包，在CentOS和Debian/Ubuntu下安装都十分顺利，只是最近在RedHat Enterprise Linux Server（RHEL）下安装却出了一些问题，主要原因是RHEL的yum需要商业授权，使用LNMP一键安装包安装时，会出现以下错误：

[root@vpser ~]# yum install libjpeg libjpeg-devel
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Install Process
No package libjpeg-devel available.
Nothing to do

解决方法：

原理：用CentOS的免费yum替代RHEL的商业yum

1.卸载yum

rpm -qa|grep yum|xargs rpm -e --nodeps

2.确认你的RHEL的版本，如RHEL 5.4 64bit

cat /etc/issue && uname -a

本文均以RHEL 5.4 64bit系统为例，下文的5，x86_64对应5.x 64位；若你的系统为6.x 32bit，请到http://mirrors.kernel.org/centos/相关目录查询并替代

3.安装CentOS的yum

wget http://mirrors.kernel.org/centos/5/os/x86_64/CentOS/yum-3.2.22-39.el5.centos.noarch.rpm
wget http://mirrors.kernel.org/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
wget http://mirrors.kernel.org/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm
rpm -ivh yum-*

4.设置yum的库（如果此命令出错或无效，请将$releasever替换成5或6；$basearch替换成i386或x86_64，依据系统的实际情况而定）

cat >/etc/yum.repos.d/CentOS-Base.repo<<eof
[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.kernel.org/centos/$releasever/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5

#released updates 
[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.kernel.org/centos/$releasever/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5

#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
baseurl=http://mirrors.kernel.org/centos/$releasever/addons/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&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-$releasever - Extras
baseurl=http://mirrors.kernel.org/centos/$releasever/extras/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirrors.kernel.org/centos/$releasever/centosplus/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&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-$releasever - Contrib
baseurl=http://mirrors.kernel.org/centos/$releasever/contrib/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib
gpgcheck=1
enabled=0
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
eof

5.最后，执行以下命令进行测试：

yum makecache