YUM Configuration in Linux RHEL/CentOS 6

YUM (YELLOW DOG UPDATE MODIFIER)

                YUM(Yellowdog Update Modifier) is a default package management tool in Redhat/ CentOS.By using yum tool we can install, upgrade,remove the packages and also we can see the information about packages.
         
                 YUM is an interactive tool which waits for the confirmation of a user, using this tool we can install the required package with dependencies.

For installing/Uninstalling a packages with yum :
 Syntax : # yum

            where options:
 

·                                            install          

·                                            remove

·                                            list

·                                            info

·                                            update

·                                            groupinstall

·                                            groupremove

·                                            grouplist

·                                            groupinfo, etc...

You can install Packages using yum, first create a repository of all packages using these steps.

Step1: To Mount the DVD, Copy all packages in one location
        
         [root@bsrtech ~]# cd /media/path of packages

         [root@bsrtech ~]# cp *  /pkgs

          where copy all packages in /pkgs directory

Step2: Change directory, install "createrepo" package

       [root@bsrtech ~]# cd /pkgs

       [root@bsrtech ~]# rpm -ivh createrepo

    Install dependencies also

       [root@bsrtech ~]# rpm -ivh python-deltaparm

       [root@bsrtech ~]# rpm -ivh deltaparm

Step3: Specify the repository location to yum.

       [root@bsrtech ~]# createrepo -v .

          where "." is present location

Step4: Create a file with repo as extension and specify the yum details in /etc/yum.repos.d

       [root@bsrtech ~]# cd /etc/yum.repos.d/

       [root@bsrtech ~]# vim pkgs.repo

                   [mahesh-pkgs]
              
                  name        =  "pkgs"
                  baseurl     =  file:///pkgs
                  gpgcheck =  0

       where gpgcheck is to check the authentication of repository.

Local YUM repository is created successfully, now you can install any package using yum command


Note : In order to use yum repository we have to clean the yum meta data, so before installing any package firsttime, use yum clean all command show below

       [root@bsrtech ~]# yum clean all
 
To see the list of packages in index i.e repository

        [root@bsrtech ~]# yum list
 
 To see list of installed packages

        [root@bsrtech ~]# yum list installed | less
 
 To install a package using yum

       [root@bsrtech ~]# yum install firefox*
 
 To remove package using yum

       [root@bsrtech ~]# yum remove firefox* -y

     where "y" means without confirmation.