https://www.redhat.com/archives/fedora-legacy-list/2006-July/msg00028.html
The Fedora legacy project has announced that they will discontinue errata updates starting in October. I have a few clients with servers still running 7.3 and 9. RHEL or CentOS is the currently the obvious choice to replace these old Red Hat installs.
Red Hat will provide errata for RHEL4 until February 2010 and [...]
Posts under ‘Distributions’
End of Life times (Fedora Core 1, 2, Red Hat Linux 7.3, 9)
Migrate RHEL to CentOS
For those of you interested in using CentOS instead of RHEL you don’t need to reinstall. By following these instructions you will convert an existing RHEL4 server over to CentOS 4:
I downloaded the following files from a CentOS mirror into an empty directory:
centos-release-4-2.1.i386.rpm
centos-yumconf-4-4.3.noarch.rpm
python-elementtree-1.2.6-4.i386.rpm
python-sqlite-1.1.6-1.i386.rpm
python-urlgrabber-2.9.6-2.noarch.rpm
RPM-GPG-KEY-centos4
sqlite-3.2.2-1.i386.rpm
yum-2.4.0-1.centos4.noarch.rpm
Then ran:
rpm –import RPM-GPG-KEY-centos4
rpm -e –nodeps redhat-release
rpm -Uvh *.rpm
then
yum upgrade