CentOS的DVD光盘和RHEL5的DVD光盘、构建Yum库的对比。

1：CentOS的简单的很。顺手，将CentOS光盘加到自动挂载里面了。因为都是虚拟机的环境。加载镜像就可以了。
操作如下：

[root@rhce ~]# cat /etc/auto.master
#
# $Id: auto.master,v 1.4 2005/01/04 14:36:54 raven Exp $
#
# Sample auto.master file
# This is an automounter map and it has the following format
# key [ -mount-options-separated-by-comma ] location
# For details of the format look at autofs(5).
#
/misc   /etc/auto.misc
/net    -hosts
#
# Include central master map if it can be found using
# nsswitch sources.
#
# Note that if there are entries for /net or /misc (as
# above) in the included master map any keys that are the
# same will not be seen as the first read key seen takes
# precedence.
#
+auto.master
[root@rhce ~]# cat /etc/auto.misc
#
# $Id: auto.misc,v 1.2 2003/09/29 08:22:35 raven Exp $
#
# This is an automounter map and it has the following format
# key [ -mount-options-separated-by-comma ] location
# Details may be found in the autofs(5) manpage

iso              -fstype=iso9660,ro,nosuid,nodev :/dev/cdrom

# the following entries are samples to pique your imagination
#linux          -ro,soft,intr           ftp.example.org:/pub/linux
#boot           -fstype=ext2            :/dev/hda1
#floppy         -fstype=auto            :/dev/fd0
#floppy         -fstype=ext2            :/dev/fd0
#e2floppy       -fstype=ext2            :/dev/fd0
#jaz            -fstype=ext2            :/dev/sdc1
#removable      -fstype=ext2            :/dev/hdd
[root@rhce ~]# cd /misc/iso
[root@rhce iso]# ls
CentOS    RELEASE-NOTES-cz       RELEASE-NOTES-es       RELEASE-NOTES-ja       RELEASE-NOTES-pt_BR.html  RPM-GPG-KEY-CentOS-5
EULA      RELEASE-NOTES-cz.html  RELEASE-NOTES-es.html  RELEASE-NOTES-ja.html  RELEASE-NOTES-pt.html     TRANS.TBL
GPL       RELEASE-NOTES-de       RELEASE-NOTES-fr       RELEASE-NOTES-nl       RELEASE-NOTES-ru
images    RELEASE-NOTES-de.html  RELEASE-NOTES-fr.html  RELEASE-NOTES-nl.html  RELEASE-NOTES-ru.html
isolinux  RELEASE-NOTES-en       RELEASE-NOTES-it       RELEASE-NOTES-pt       repodata
NOTES     RELEASE-NOTES-en.html  RELEASE-NOTES-it.html  RELEASE-NOTES-pt_BR    RPM-GPG-KEY-beta
[root@rhce iso]# tree -d /misc/iso/
/misc/iso/
|-- CentOS
|-- NOTES
|-- images
|   |-- pxeboot
|   `-- xen
|-- isolinux
`-- repodata

7 directories
[root@rhce iso]# tree -C repodata/
repodata/
|-- TRANS.TBL
|-- comps.xml
|-- filelists.xml.gz
|-- other.xml.gz
|-- primary.xml.gz
`-- repomd.xml

0 directories, 6 files
[root@rhce iso]# cat /etc/yum.repos.d/CentOS-Media.repo
# CentOS-Media.repo
#
# This repo is used to mount the default locations for a CDROM / DVD on
#  CentOS-5.  You can use this repo and yum to install items directly off the
#  DVD ISO that we release.
#
# To use this repo, put in your DVD and use it with the other repos too:
#  yum --enablerepo=c4-media [command]
#
# or for ONLY the media repo, do this:
#
#  yum --disablerepo=\* --enablerepo=c4-media [command]

[c5-media]
name=CentOS-$releasever - Media
#baseurl=file:///media/CentOS/
#       file:///media/cdrom/
#        file:///media/cdrecorder/
baseurl=file:///misc/cd
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-beta
[root@rhce ~]# yum check-update
Loading "installonlyn" plugin
Setting up repositories
c5-media                    100% |=========================| 1.1 kB    00:00
Reading repository metadata in from local files
primary.xml.gz            100% |=========================| 798 kB    00:00
c5-media    : ################################################## 2334/2334
Added 2334 new packages, deleted 0 old in 13.97 seconds