http://wiki.openiam.com/pages/viewpage.action?pageId=7635198
http://www.sysadminshare.com/2012/08/public-key-for-rpm-is-not-installed-how.html
/etc/yum.repos.d/rhel-source.repo
[dvd]
name=Red Hat Enterprise Linux Installation DVD
baseurl=file:///mnt/Server
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
yum install –enablerepo=dvd
Using your DVD as a yum repository on a RPM based Linux