Add The Group Information IN Yum Repository in simple Two steps

= Yum groups and repositories =

Yum supports the group commands
  * grouplist
  * groupinfo
  * groupinstall
  * groupremove
  * groupupdate

Groups are read from the "group" xml metadata that is optionally available from
each repository. If yum has no repositories which support groups then none of 
the group operations will work. 
#yum grouplist

   This will list the installed and available groups for your system in two
   separate lists. If you pass the optional 'hidden' argument then all of 
   the groups which are set to 'no' in the group xml tag.

  yum groupinfo groupname
 
  This will give you detailed information for each group including:
  description, mandatory, default and optional packages.

      #yum groupinstall groupname
     #yum groupupdate groupname

  Despite their differing names both of these commands perform the same
  function. They will attempt to install/update all of the packages in the
  group that are of the types 'default' or 'mandatory' (by default).
  (To change this types of packages edit the value of the group_package_types 
  option in yum.conf.) And they will install any additional dependencies 
  needed by any of the installing/updating packages.

    # yum groupremove groupname
 
  This will remove all packages, of any type, in the named group. It will also
  remove any package that depends on any of these packages.
   


== Setting up your own groups in your own repository ==

This process is pretty easy, just two steps:
 1. create a file in the groups format used by yum
 2. tell createrepo to include that group file in your repository.


=== Step 1 ===
  You can either open a text editor and create the groups xml file manually or you
  can run the yum-groups-manager command from yum-utils. 

 # yum-groups-manager -n "My Group" --id=mygroup --save=/root/mygroups.xml --mandatory yum glibc rpm  dhcp bind
  # cat /root/mygroups.xml


 
   mygroup
   False
   True
   1024
   My group
  
   
      glibc
      rpm
      yum
     dhcp
     bind
   
 




=== Step 2 ===
  To include this in a repository, just tell [http://createrepo.baseurl.org/ createrepo] to use it when making or remaking
  your repository.

#createrepo -g /path/to/mygroups.xml /srv/my/repo
 
After that we can check our Group Name
# yum grouplist
#yum groupinfo mygroup
# yum groupinstall