Jerry Geis wrote:
> What is the rule of thumb for reboots after updates...

I'd say the rule of thumb is to do whatever works best for you, and that
you'll likely get quite the variety of different responses.  ;o)

> Certainly if I update from 5.2 to 5.3 I reboot.
>
> But if you update something like krb5 or pam
> does that require a reboot? Does the "fix" get automatically loaded and used
> or do you just do a reboot always?

So, I would say "reboot" is the simplest, safest, foolproof way to
ensure you're running updates even if some people will balk at the idea
that you have to reboot a Linux system.  You don't have to of course,
but life is short and rebooting is fast.  ;o)