YUM Configuration in Linux RHEL/CentOS

                            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.

               21 Yum Command Examples - Redhat/CentOS/Fedora
 

For installing/Uninstalling a packages with yum :
 Syntax : # yum <option> <pkg-name>

            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 OS DVD's content to Hard-Drive as below
        

         [root@bsrtech ~]# cd /media/path of files

         [root@bsrtech ~]# cp *  /pkgs

          where copy all packages in /pkgs directory

Note :  If you have RHEL5 DVD then execute below command once.
         

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  Specify the repository location to yum.        [root@bsrtech ~]# createrepo -v .           where "." is present location

Step2: 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.