Configuring YUM

I have a small VM running RHEL 6 (just for playing around). The installation was some kind hard - I have to do nearly everything by hand... Anyway the operating system itself is running now. To automatically install software from the DVD I would like to use YUM, but I have to set it up first. There is a main configuration file - yum.conf which resides in /etc. This is the default content of it: 

# cat /etc/yum.conf
[main]
cachedir=/var/cache/yum/$basearch/$releasever
keepcache=0
debuglevel=2
logfile=/var/log/yum.log
exactarch=1
obsoletes=1
gpgcheck=1
plugins=1
installonly_limit=3

Next we need the Media ID from the DVD. It can be obtained from a file call media.repo from the DVD. First mount the DVD:

# mkdir -p /mnt/dvd
# mount /dev/sr0 /mnt/dvd

Or mount the ISO file:

# mkdir -p /mnt/dvd
# mount /root/rhel6.iso /mnt/dvd -o loop

Get Media ID from DVD:

# cat /mnt/dvd/media.repo
[InstallMedia]
name=Red Hat Enterprise Linux 6.0
mediaid=0123456789.012345
...

Now configure /etc/yum.repos.d/file.repo and add the DVD (or the ISO file) as a repository and add /mnt/dvd as baseurl:

# cat /etc/yum.repos.d/file.repo
[dvd]
mediaid=0123456789.012345
name=DVD
baseurl=file:///mnt/dvd
enabled=1
gpgcheck=0

Check if it accept the repository:

# yum repolist
Loaded plugins: rhnplugin
This system is not registered with RHN.
RHN support will be disabled.
dvd                          | 3.7 kB     00:00 ...
dvd/primary_db               | 2.9 MB     00:00 ...

Install a package from the repository (e.g. tree):

# yum install tree
Loaded plugins: rhnplugin
This system is not registered with RHN.
RHN support will be disabled.
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package tree.x86_64 0:1.5.3-2.el6 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
Package   Arch       Version         Repository     Size
tree      x86_64     1.5.3-2.el6     dvd            36 k
Transaction Summary
Install       1 Package(s)
Upgrade       0 Package(s)
Total download size: 36 k
Installed size: 65 k
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
  Installing     : tree-1.5.3-2.el6.x86_64
1/1
Installed:
  tree.x86_64 0:1.5.3-2.el6

Complete! Just keep in mind that you always have to mount the DVD or the ISO file before you can install any software via YUM.