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June 2009

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Subject:
Re: System UIDs and GIDs
From:
Dr Andrew C Aitchison <[log in to unmask]>
Reply To:
Dr Andrew C Aitchison <[log in to unmask]>
Date:
Thu, 18 Jun 2009 17:36:26 +0100
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On Thu, 18 Jun 2009, Dr Andrew C Aitchison wrote:

> I note in
> 	http://rhn.redhat.com/errata/RHBA-2009-0484.html
> that the new setup package
> 	setup-2.5.58-7.el5
> allocates uid=16:gid=16 to oprofile.
>
> For historical reasons I use 16:16 for exim and further note that
> the SL5 exim package users uid=93, and that I have already
> used 93 for my Maple licence manager.
>
> A package can use useradd to pick a uid (and gid?) at install time
> but having different uid/gids for the same system user on different machines 
> seems like a bad idea (Fedora seems to agree:
> http://fedoraproject.org/wiki/PackageDynamicUserCreationConsideredBad
> ).
>
> Do you know of any list of safe/reserved/used uid/gids for RedHat/SL5
> so that I can avoid future clashes after I renumber this time ?

Doh. I should have thought to look in the package.
/usr/share/doc/setup-2.5.58/uidgid is obviously definitive for
Red Hat at least.

-- 
Dr. Andrew C. Aitchison		Computer Officer, DPMMS, Cambridge
[log in to unmask]	http://www.dpmms.cam.ac.uk/~werdna

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