Install and configure yum on RHEL 7
yum (yellowdog update module )
mount the rhel-dvd on mnt
#mount /dev/sr0 /mnt
#df -Th (for checking)
Create repo file
#cd /etc/yum.repo.d/[filename]
#vim (filename)
{
[filename]
gpccheck=0
enable=1
baseurl=file:\\\\mnt
:wq (for saving)
}
#yum clean all
#yum repolist all
Now try to install any packages, like xclock, httpd, vftpd etc.