If you want to be able to install the packages from DVD or CDROM available with you try the following instructions.
First take the backup of /etc/yum.repos.d, remove those old repo files and add a new file called local.repo with the following lines:

[local]
name=Local CD Repo
baseurl=file:///mnt/cdrom

 

Here /mnt/cdrom is the location of CD mount. Change it as per your system’s configuration.

Once this is done, you can go ahead with yum install to install packages from CDROM.