[root@localhost ~]# mount
/dev/sda1 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
none on /proc/fs/vmblock/mountPoint type vmblock (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
/dev/hdc on /media/RHEL_5.4 i386 DVD type iso9660 (ro,noexec,nosuid,nodev,uid=0)    这个就是光盘的挂载点了

[root@localhost ~]# mkdir /cdyum==》新建文件夹，用于挂载
[root@localhost ~]# mount /dev/hdc /cdyum/==》挂载到刚刚建好的文件夹里
mount: block device /dev/hdc is write-protected, mounting read-only
[root@localhost ~]# mount==》查看挂载信息
/dev/sda1 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
none on /proc/fs/vmblock/mountPoint type vmblock (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
/dev/hdc on /media/RHEL_5.4 i386 DVD type iso9660 (ro,noexec,nosuid,nodev,uid=0)
/dev/hdc on /cdyum type iso9660 (ro)       ==》这个就是我们手动挂载的目录

[root@localhost ~]# cp -a /etc/yum.repos.d/rhel-debuginfo.repo /etc/yum.repos.d/rhel-debuginfo.repo.bak

[rhel-debuginfo]
name=Red Hat Enterprise Linux $releasever – $basearch – Debug
baseurl=ftp://ftp.redhat.com/pub/redhat/linux/enterprise/$releasever/en/os/$basearch/Debuginfo/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

name=Red Hat Enterprise Linux $releasever – $basearch – Debug
baseurl=file:///cdyum/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

Loaded plugins: rhnplugin, security
Available Packages
Name       : bind
Arch       : i386
Epoch      : 30
Version    : 9.3.6
Release    : 4.P1.el5
Size       : 978 k
Repo       : rhel-debuginfo
Summary    : Berkeley 互联网域名（BIND）DNS（域名系统）服务器。
URL        : http://www.isc.org/products/BIND/
License    : BSD-like
Description: BIND (伯克利互联网域名) 是 DNS（域名系统）协议的一种实现。
           : BIND 包括一个 DNS 服务器（named），它把主机名解析为 IP 地址；
           : 一个解析器库（在与 DNS 通讯时应用程序所使用的例程）；以及检
           : 验 DNS 服务器是否被正确操作的工具。

[root@localhost ~]# yum install bind
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Install Process
Resolving Dependencies
–> Running transaction check
—> Package bind.i386 30:9.3.6-4.P1.el5 set to be updated
–> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package     Arch        Version                    Repository             Size
================================================================================
Installing:
bind        i386        30:9.3.6-4.P1.el5          rhel-debuginfo        978 k

Transaction Summary
================================================================================
Install      1 Package(s)        
Update       0 Package(s)        
Remove       0 Package(s)

Total download size: 978 k
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : bind                                                     1/1

Installed:
  bind.i386 30:9.3.6-4.P1.el5

Complete!
[root@localhost ~]#