Gentoo Update Guide
This article will cover the basic process for updating a CSL System running Gentoo Linux. This does not cover kernel updates which are generally handled separately.
You will need root access to the system you are planning to update. You should also schedule appropriate downtime when updating production services.
Portage Tree Update
The portage tree contains all of the packages and versions available to the system. It (and any installed overlays) will need to be updated prior to updating the system software. On CSL systems, this can easily be done with the following command:
Updating all installed software on a Gentoo system is done with the following command:
emerge -auND @world
This command will probably think for quite a long time and then spit out a (potentially long) list of updates it wishes to apply.