Updating redhat 9
The old adage of ...there is always time to do it over, there is never time to do it right.... If it is important for it to work right, do a fresh reinstall. Red Hat, Solaris, HPUX, and a few others have always recommended against upgrades between major versions. I can tell you war stories including what should have been a painful 3 month 3000 man/hour Documentum upgrade (3 major versions up) with an easy backout plan, and turned into a 14 month uber painful massive effort with a career ending backout plan using over 12,000 man/hours.All because the CIO declared no new Sun Hardware, and my manager decided he did not want ANY more Sun hardware, not even k worth of new hardware.
Often, announcements about a given security exploit are accompanied with a patch (or source code) that fixes the problem.
Any issues not related to the upgrade will be supported.
If at any time a problem appears to be the result of an in-place upgrade procedure, Red Hat may require you to reinstall the system.
Applications utilizing a shared library typically load the shared code when the application is initialized, so any applications using an updated library must be halted and relaunched.
This will walk you through the upgrade procedure, which very closely resembles a normal installation.