Spacewalk is the open source project for Red Hat's Satellite System Management, for disconnected/offline Satellite Systems. This can be used to make your CentOS/RHEL/Fedora .etc PCI DSS 1.2 Compliant for it's updates system.
Download the EPEL repo, for the [Extra Packages for Enterprise Linux] packages required.
rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-2.noarch.rpm rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 rpm -e specspo rpm -Uvh http://spacewalk.redhat.com/yum/0.3/rhel/5Server/i386/spacewalk-repo-0.3-1.el5.sw.noarch.rpm yum install spacewalk # to install spacewalk
code