[slurm-users] slurmctld/slurmdbd filesystem/usermap requirements

[Diego Zuccato]

Tks a lot to both Steffen and Paul!
That clarifies everything!

Il 10/02/2022 14:11, Paul Brunk ha scritto:
> Hi:
> 
> slurmctld runs as an unprivileged user ('slurm' by default) who probably 
> doesn't have read access to the user's job scripts.  'sbatch' submits 
> the scripts via network to slurmctld, who stores them in the slurm.conf 
> 'StateSaveLocation', and sends them to slurmds at dispatch time, who 
> store them on each node in the slurm.conf 'SlurmdSpoolDir', as Steffen 
> noted.
> 
> All this to say that the slurmctld host doesn't need to see the users' 
> home dirs and/or job script dirs.
> 
> ==
> 
> Paul Brunk, system administrator
> 
> Georgia Advanced Resource Computing Center
> 
> Enterprise IT Svcs, the University of Georgia
> 
> On 2/10/22, 6:26 AM, "slurm-users" 
> <slurm-users-bounces at lists.schedmd.com> wrote:
> 
> [EXTERNAL SENDER - PROCEED CAUTIOUSLY]
> 
> On Thu, 2022-02-10 at 11:59:58 +0100, Diego Zuccato wrote:
> 
>  > Hello all.
> 
>  >
> 
>  > Does slurmctld (or slurmdbd) need to access the same filesystems used on
> 
>  > submit nodes? Or they just receive the needed information in the request?
> 
>  >
> 
>  > Does slurmctld need read access to /home/userA/myjob.sh or does it 
> receive
> 
>  > the job script as a "blob" or as a path? Does it even need to know 
> userA's
> 
>  > GID or will it simply use 'userA' to lookup associations in dbd?
> 
> Looking into one of our Slurm installations (pre-installed):
> 
> - file systems must not be shared with the machine running the dbd/ctld,
> 
>    the job script is copied into a subdirectory of /var/spool/slurm on
> 
>    the exec node (but I can't say for sure who does this)
> 
> - UIDs are reported by the ctld so they "should" be identical for the
> 
>    controller and submit machines (and the execute ones, of course) -
> 
>    I never saw GIDs mentioned though.
> 
> Does this help?
> 
> - Steffen
> 
> --
> 
> Steffen Grunewald, Cluster Administrator
> 
> Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
> 
> Am Mühlenberg 1 * D-14476 Potsdam-Golm * Germany
> 
> ~~~
> 
> Fon: +49-331-567 7274
> 
> Mail: steffen.grunewald(at)aei.mpg.de
> 
> ~~~
> 

-- 
Diego Zuccato
DIFA - Dip. di Fisica e Astronomia
Servizi Informatici
Alma Mater Studiorum - Università di Bologna
V.le Berti-Pichat 6/2 - 40127 Bologna - Italy
tel.: +39 051 20 95786