This Tip Show Exactly and Step-by-Step How-to Enabling YUM Package Manager on RHEL 5-6 without a RedHat Subscription by the Installation DVD:

1. If you Do Not Have a RHEL Subscription But you Have the Installation DVD of the Release then you will need to Make a Local Repository for Yum…
   (If your Yum is Just Working on RHEL SKIP this Point)
   This Process has been Performed on a RHEL Beta 2 Release.First you Need to Connect the DVD or DVD.iso to the Virtual Machine.
   
   Then you Make the Local Repo Directories and you Copy the Packages Contained into the DVD Into a Location Reachable by Apache and for Default:
   • Make the Repo Directory

     su
     mkdir -p /var/www/html/yum/base-pkg

   • Copy the Packages Contained on the DVD Into Target:

     cp /media/RHEL*/Packages/* /var/www/html/yum/base-pkg

   Download and Install the createrepo Package with Dependencies
   From: Packages Mirror
   Grab: createrepo-version.el6.rpm, deltarpm-version.el6.rpm and python-deltarpm-version.el6.rpm
   Install first Dependencies and After Createrepo:

   rpm -ivh deltarpm-version.el6.rpm python-deltarpm-version.el6.rpm
   rpm -ivh createrepo-version.el6.rpm

   Create the Local Repository with:

   createrepo /var/www/html/yum/base-pkg

   After Successful Setup the base-pkg Dir Content Should Show:

   ls -l /var/www/html/yum/base-pkg/repodata/
   -rw-r--r-- 1 root root 2227275 2010-02-18 11:51 filelists.xml.gz
   -rw-r--r-- 1 root root 6487453 2010-02-18 11:51 other.xml.gz
   -rw-r--r-- 1 root root  747714 2010-02-18 11:51 primary.xml.gz
   -rw-r--r-- 1 root root     951 2010-02-18 11:51 repomd.xml

   Create the Yum Configuration your Repository File

   nano /etc/yum.repos.d/mylocal.repo

   Insert Something like:

   [base-local] name=RHEL $releasever - $basearch failovermethod=priority baseurl=http://127.0.0.1/yum/base-pkg/ enabled=1 gpgcheck=0 

   You Need to Start Apache Before you Repository is Usable.
   Here I show you the Simplest Method on a RHEL Desktop.
   Open the Services Utility:
   
   Enable and Connect the Httpd Service:
   
   Instead if You Manage a Server and Not a Desktop I Presume You Should be Already Able To Start Apache…
   After you can Check if Yum is Working with the New Setup by:

   yum list | less

   The Output Should Show your New Local Repository 🙂