[Beowulf] Users abusing screen

Skylar Thompson skylar at cs.earlham.edu
Thu Oct 27 16:43:24 PDT 2011


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On 10/27/2011 04:37 PM, Mark Hahn wrote:
>> nice 'pam_slurm' module which allows a user to login only to those nodes
>> on which the said user has active jobs (allocated through slurm). The
>
> I think this is slightly BOFHish, too. do people actually have problems
> with users stealing cycles this way? the issue is actually stealing,
> and we simply tell our users not to steal. (actually, I don't think we
> even point it out, since it's so obvious!)
>
> that means we don't attempt to control (we had pam_slurm installed and
> actually removed it.) after all, just because a user's job is done, it
> doesn't mean the user has no reason to go onto that node (maybe there's a
> status file in /tmp, or a core dump or something.)
>
> if someone persisted in stealing cycles, we'd lock their account.
>

We do the equivalent with GE it if the end user requests it. We have
some clusters that need to support a mix of critical jobs supporting
data pipelines, and less-critical academic work. Our default stance,
though, is to trust our users to do the right thing. Mostly it works,
but sometimes we do need to bring out the LART stick.

- -- 
- --
- -- Skylar Thompson (skylar at cs.earlham.edu)
- -- http://www.cs.earlham.edu/~skylar/
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