[Beowulf] head node abuse

John Hearns hearnsj at gmail.com
Fri Mar 26 14:09:30 UTC 2021


[image: image.png]

On Fri, 26 Mar 2021 at 13:57, Michael Di Domenico <mdidomenico4 at gmail.com>

> does anyone have a recipe for limiting the damage people can do on
> login nodes on rhel7.  i want to limit the allocatable cpu/mem per
> user to some low value.  that way if someone kicks off a program but
> forgets to 'srun' it first, they get bound to a single core and don't
> bump anyone else.
> i've been poking around the net, but i can't find a solution, i don't
> understand what's being recommended, and/or i'm implementing the
> suggestions wrong.  i haven't been able to get them working.  the most
> succinct answer i found is that per user cgroup controls have been
> implemented in systemd v239/240, but since rhel7 is still on v219
> that's not going to help.  i also found some wonkiness that runs a
> program after a user logs in and hacks at the cgroup files directly,
> but i couldn't get that to work.
> supposedly you can override the user-{UID}.slice unit file and jam in
> the cgroup restrictions, but I have hundreds of users clearly that's
> not maintainable
> i'm sure others have already been down this road.  any suggestions?
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