Re: [slurm-users] slurm job_container/tmpfs

Tue, 21 Nov 2023 05:39:29 -0800 

Hello Alain,
maybe I'm missing the point, but from my understanding the job_container/tmpfs plugin uses the directory under BasePath to store its data, used to create the bind mounts for the users. The folder itself is not meant to be used by others. The folders in the hidden directory with user privileges under your /scratch are the bind mounts. Those folders are specified in the Dirs parameter <https://slurm.schedmd.com/job_container.conf.html#OPT_Dirs> of job_container.conf. You may have more luck trying to use this parameter for your needs, perhaps? There is also a parameter to specify an "InitScript" which may be used to create folders dinamically. One last thing, the those configuration has been added in one of the latest releases of Slurm, so they may not work with your version. 

Best regards,
Lorenzo Bosio

On 21/11/23 14:07, Arsene Marian Alain wrote:



Thanks Sean. I’ve tried using slurm prolog/epilog scripts but without 
any success. That's why I decided to look for other solutions and 
job_container/tmpfs plugin seemed like a good alternative.



*De:* slurm-users <slurm-users-boun...@lists.schedmd.com> *En nombre 
de *Sean Mc Grath

*Enviado el:* martes, 21 de noviembre de 2023 12:57
*Para:* Slurm User Community List <slurm-users@lists.schedmd.com>
*Asunto:* Re: [slurm-users] slurm job_container/tmpfs


*ATENCIÓN*:Este correo electrónico se envió desde fuera de la UAH. No 
haga clic en enlaces ni abra archivos adjuntos a menos que reconozca 
al remitente y sepa que el contenido es seguro.



Would a prolog script, https://slurm.schedmd.com/prolog_epilog.html, 
do what you need? Sorry if you have already considered that and I 
missed it.


---

Sean McGrath

Senior Systems Administrator, IT Services

------------------------------------------------------------------------


*From:*slurm-users <slurm-users-boun...@lists.schedmd.com> on behalf 
of Arsene Marian Alain <alain.ars...@uah.es>

*Sent:* Tuesday 21 November 2023 09:58
*To:* Slurm User Community List <slurm-users@lists.schedmd.com>
*Subject:* Re: [slurm-users] slurm job_container/tmpfs

Hello Brian,


Thanks for your answer. With the job_container/tmpfs plugin I don't 
really create the directory manually.



I just give my Basepath=/scratch (a local directory for each node that 
is already mounted with 1777 permissions) in job_container.conf. The 
plugin automatically generates for each job a directory with the 
"JOB_ID", for example: /scratch/1805



The only problem is that directory 1805 is generated with root owner 
and permissions 700. So the user who submitted the job cannot 
write/read inside directory 1805.



Is there a way for the owner of directory 1805 to be the user who 
submitted the job and not root?



*De:* slurm-users <slurm-users-boun...@lists.schedmd.com> *En nombre 
de *Brian Andrus

*Enviado el:* lunes, 20 de noviembre de 2023 23:29
*Para:* slurm-users@lists.schedmd.com
*Asunto:* Re: [slurm-users] slurm job_container/tmpfs


*ATENCIÓN*:Este correo electrónico se envió desde fuera de la UAH. No 
haga clic en enlaces ni abra archivos adjuntos a menos que reconozca 
al remitente y sepa que el contenido es seguro.



How do you 'manually create a directory'? That would be when the 
ownership of root would be occurring. After creating it, you can 
chown/chmod it as well.


Brian Andrus

On 11/18/2023 7:35 AM, Arsene Marian Alain wrote:

    Dear slurm community,

    I run slurm 21.08.1 under Rocky Linux 8.5 on my small HPC cluster
    and am trying to configure job_container/tmpfs to manage the
    temporary directories.

    I have a shared nfs drive "/home" and a local "/scratch" (with
    permissions 1777) on each node.

    For each submitted job I manually create a directory with the
    "JOB_ID.$USER" in the local "/scratch" which is where all the temp
    files for the job will be generated. Now, I would like to do these
    automatically (especially to remove the directory when the job
    finishes or is canceled):

    I added the following parameters in my /etc/slurm.conf:

    JobContainerType=job_container/tmpfs

    PrologFlags=contain

    So, I have created the "job_container.conf" in the directory
    "/etc/slurm"

    with the following configuration:

    AutoBasePath=false

    BasePath=/scratch

    Then, I replicated the changes to all nodes and restarted the
    slurm daemons.

    Finally, when I launch the job a directory with the "JOB_ID" is
    created in the local "/scratch" of the compute node. The only
    problem is that the owner of the directory is "root" and the user
    who submitted the job doesn’t have read and write permissions to
    that directory (other users do not either).

    I would like that:

    1) The name of the automatically created directory will be:
    "JOB_ID.$USER"

    2) The owner of the directory will be the user who submitted the
    job, not "root".

    Please, could someone help me?

    Thanks a lot.

    Best regards,

    Alain


--
*/Dott. Mag. Lorenzo Bosio/*
Tecnico di Ricerca
Dipartimento di Informatica


Università degli Studi di Torino
Corso Svizzera, 185 - 10149 Torino
tel. +39 011 670 6836





















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