前几篇关于rhel5的光盘更新讲得太凌乱了，今天我又想了想把它优化了一下，只需几步就可以完成，详见如下内容：
1，进入/etc/yum.repos.d目录中，编辑rhel5-local.repo文件，这个文件名可以随便取，以个人爱好为准，加入如下内容：
[Cluster]
name=Red Hat Enterprise Linux $releasever - $basearch -Cluster
baseurl=file:///mnt/rhel5/Cluster
enable=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[ClusterStorage]
name=Red Hat Enterprise Linux $releasever - $basearch -ClusterStorage
baseurl=file:///mnt/rhel5/ClusterStorage
enable=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[Server]
name=Red Hat Enterprise Linux $releasever - $basearch -Server
baseurl=file:///mnt/rhel5/Server
enable=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
[VT]
name=Red Hat Enterprise Linux $releasever - $basearch -VT
baseurl=file:///mnt/rhel5/VT
enable=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
2，挂载你的rhel5.iso文件.
mount /dev/hdc /mnt/rhel5
我是在vmware里做的，它的光驱就是/dev/hdc设备。
3，创建以下几个必要的目录：
mkdir -p /var/rhel/{Cluster,ClusterStorage,Server,VT}
4，用createrepo命令创建相应文件，前提你必须安装createrepo软件包：
createrepo -o /var/rhel/Cluster -g /mnt/rhel5/Cluster/repodata/comps-rhel5-cluster.xml /mnt/rhel5/Cluster
createrepo -o /var/rhel/ClusterStorage -g /mnt/rhel5/ClusterStorage/repodata/comps-rhel5-cluster-st.xml /mnt/rhel5/ClusterStorage
createrepo -o /var/rhel/Server -g /mnt/rhel5/Server/repodata/comps-rhel5-server-core.xml /mnt/rhel5/Server
createrepo -o /var/rhel/VT -g /mnt/rhel5/VT/repodata/comps-rhel5-VT.xml /mnt/rhel5/VT
5，挂载：
mount --bind /var/rhel/Cluster/repodata /mnt/rhel5/Cluster/repodata
mount --bind /var/rhel/ClusterStorage/repodata /mnt/rhel5/ClusterStorage/repodata
mount --bind /var/rhel/Server/repodata /mnt/rhel5/Server/repodata
mount --bind /var/rhel/VT/repodata /mnt/rhel5/VT/repodata
6，yum clean all
剩下的就是安装软件包和更新了，呵呵，自己试试吧！
