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Creating /run/user/$UID - for Podman runtime
by John Snowdon 08 Sep '25

08 Sep '25

We are in the middle of implementing an extensive range of container support on our new HPC platform and have decided to offer our users a wide suite of technologies to better support their workloads: * Apptainer * Podman (rootless) * Docker (rootless) We've already got a solution for automated entries in /etc/subuid and /etc/subgid on the head nodes (available here under GPL: https://github.com/megatron-uk/pam_subid), which is where we intend users to build their container images, and building and running containers using Apptainer and Podman in those environments works really well - we're happy that it should take care of 95% of our users needs (Docker is the last few percent....) and not involve giving them any special permissions. If I ssh directly to a compute node, then Podman also works there to run an existing image (podman container run ...). What I'm struggling with now is running Podman under Slurm itself on our compute nodes. It appears as though Podman (in rootless mode) wants to put the majority of its run time / state information under /run/user/$UID ... this is fine on the head nodes which have interactive logins hitting PAM modules which instantiate the /run/user/$UID directories, but not under sbatch/srun which doesn't create them by default. I've not been able to find a single, magical setting which will move all of the Podman state information out from /run/user to another location - there are 3 or 4 settings involved, and even then I still find various bits of Podman want to create stuff under there. Rather than hacking away at getting Podman changed to move all settings and state information elsewhere, it seems like the cleanest solution would just be to put the regular /run/user/$UID directory in place at the point Slurm starts the job instead. What's the best way to get Slurm to create this and clean-up afterwards? Should this be in a prolog/epilog wrapper (e.g. directly calling loginctl) or is it cleaner to get Slurm to trigger the usual PAM session machinery in some manner? John Snowdon Senior Research Infrastructure Engineer (HPC) Research Software Engineering Catalyst Building, Room 2.01 Newcastle University 3 Science Square Newcastle Helix Newcastle upon Tyne NE4 5TG https://hpc.researchcomputing.ncl.ac.uk

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Slurm version 25.05.3 is now available
by Marshall Garey 04 Sep '25

04 Sep '25

We are pleased to announce the availability of Slurm version 25.05.3. This version fixes an issue that prevented deleting a QOS when running with MySQL servers (MariaDB is was unaffected). Please note that the slurmdbd will require MySQL 8.0.4+ or MariaDB 10.0.5+ to function correctly. This version also fixes heterogeneous jobs when TLS is enabled, a logging issue with syslog, and various mild to moderate stability fixes. The full list of changes are available in the CHANGELOG: https://github.com/SchedMD/slurm/blob/slurm-25.05/CHANGELOG/slurm-25.05.md Slurm can be downloaded from: https://www.schedmd.com/download-slurm/ -- Marshall Garey Release Management, Support, and Development SchedMD LLC - Commercial Slurm Development and Support

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Discussion about the --cpus-per-task flag
by Michele Esposito Marzino 04 Sep '25

04 Sep '25

Hi everyone, I would like to ask about the rationale behind the --cpus-per-task flag. While I do understand the meaning and its intended goal, I was wondering how it is managed in practice. I tried inferring this from the source code, but it is quite intricate, and not really straightforward by simply searching for the string match. Does it affect the CPUSET of each task? Who is responsible for setting this? The slurmcltd or slurmd? And how? Or at least, point me where in the code it is handled, so that I can reconstruct the whole process myself. Thanks

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sacctmgr output with and without associations
by Rémy Dernat 04 Sep '25

04 Sep '25

Hi, I have a stupid issue about sacctmgr output and associations. I would like to retrieve my accounts with all the following data : "Account","Clusters","DefaultQOS","Description","Fairshare","Flags","GrpTRESMins","GrpTRES","GrpJobs","GrpSubmitJob",GrpWall", "MaxTRESMins","MaxTRES","MaxJobs","MaxNodes","MaxSubmitJobs","MaxWall","Organization","ParentName","Priority","QosLevel" So my command is the following : sacctmgr list accounts --assoc format="Account","Clusters","DefaultQOS","Description","Fairshare","Flags","GrpTRESMins","GrpTRES","GrpJobs","GrpSubmitJob","GrpWall","MaxTRESMins","MaxTRES","MaxJobs","MaxNodes","MaxSubmitJobs","MaxWall","Organization","ParentName","Priority","QosLevel" -n -P However, I have a lot of outputs corresponding to each User association entry. That would be fine if a basic `|uniq` would remove everything I don't need, but I am stuck with grptres, which can be seen in the main account, but not in the children associations with the Users. On the opposite, if I remove `--assoc`, I don't have anymore grptres, ParentName, or related Qos values. I had to add `where User=""` to my first command to just retrieve my main accounts, without User associations. I dont' know if that is clear enough; is there something I missed with the sacctmgr output ? Thanks, Best regards, Rémy

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Can't remove account
by Matthias Leopold 01 Sep '25

01 Sep '25

Hi, I have a cluster with account foo. I want to delete this account. For every user that had associations in this account I created new associations in a different account and changed the DefaultAccount of the user. Then I deleted all associations in account foo. Now I want to delete account foo: sacctmgr delete account name=foo This gives: Error with request: You can not remove the default account of a user ... Please either remove the accounts listed above from list and resubmit, or change these users' default accounts to remove the account(s). Changes Discarded It names all associations for users that FORMERLY had DefaultAccount foo?? NO user has DefaultAccount foo anymore... I have to mention that I also have partition foo and affected users have an association in their new account with partition foo. But that shouldn't matter IMHO Has anybody seen this? What can I do? Am I getting something wrong? Slurm version is 24.05.7 thanks Matthias

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slurmrestd unable to find plugin rest_auth/jwt
by Jon Marshall 28 Aug '25

28 Aug '25

Hi, I feel like I must have missed something obvious here, so hopefully someone can spot it! We recently updated to Slurm 24.11.6 on our cluster and I made sure to compile --with slurmrestd and --with jwt, as there are a few things I've been meaning to try out with the REST API. From the rpmbuild config.log I get: $ ./configure --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc/slurm --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-systemdsystemunitdir=/usr/lib/systemd/system --enable-pkgconfig --with-jwt -- configure:21020: checking for jwt.h configure:21020: gcc -c -DNUMA_VERSION1_COMPATIBILITY -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -Wl,-z,lazy -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer conftest.c >&5 configure:21020: $? = 0 configure:21020: result: yes configure:21028: checking for jwt_add_header in -ljwt configure:21051: gcc -o conftest -DNUMA_VERSION1_COMPATIBILITY -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -Wl,-z,lazy -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -Wl,-z,relro -Wl,-z,lazy conftest.c -ljwt -ldl -lrt -lm -lresolv >&5 configure:21051: $? = 0 configure:21061: result: yes -- config.status:1746: creating src/plugins/auth/jwt/Makefile -- config.status:1746: creating src/slurmrestd/plugins/auth/jwt/Makefile -- ac_cv_header_jwt_h=yes -- ac_cv_lib_jwt_jwt_add_header=yes -- JWT_LDFLAGS='-ljwt' And: configure:26873: checking whether to compile slurmrestd configure:26904: result: yes -- configure:26915: checking for slurmrestd default port configure:26933: result: 6820 And indeed I get a slurmrestd package out of it, which I've successfully installed with no errors. I've created a JWT key and rolled it out to the controller node, but when I go to check auth types I get: slurmrestd -a rest_auth/jwt slurmrestd: fatal: Unable to find plugin: rest_auth/jwt Running an strace on this process shows that it does in fact stat the .so that does in fact exist: stat("/usr/lib64/slurm/auth_jwt.so", {st_mode=S_IFREG|0755, st_size=283728, ...}) = 0 And I'm kind of stumped now. I've checked through all the resolved bug tickets to see if I can spot what is wrong but I'm getting nothing, and I can't find anything in the mailing lists either, other than things I've checked. Has anyone else had similar issues, or can someone see the blindingly obvious thing I'm missing? Cheers Jon Jon Marshall High Performance Computing Specialist IT and Scientific Computing Team Cancer Research UK Cambridge Institute Li Ka Shing Centre | Robinson Way | Cambridge | CB2 0RE Web<http://www.cruk.cam.ac.uk/> | Facebook<http://www.facebook.com/cancerresearchuk> | Twitter<http://twitter.com/CR_UK> [Description: CRI Logo]<http://www.cruk.cam.ac.uk/>

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Assistance with Node Restrictions and Priority for Users in Floating Partition
by Manisha Yadav 28 Aug '25

28 Aug '25

Dear Team, I have a scenario where I need to provide priority access to multiple users from different projects for only 3 nodes. This means that, at any given time, only 3 nodes can be used in that partition, and if one user is utilizing all 3 nodes, no other user should be able to submit jobs to that partition, or their jobs should remain in the queue. To achieve this, I attempted to use QoS by creating a floating partition with some of the nodes and configuring a QoS with priority. I also set a limit with GrpTRES=gres/gpu=24, given that each node has 8 GPUs, and there are 3 nodes in total. I then attached the QoS to the partition and assigned it to the users who need access. I Also tried MaxTRES=gres/gpu=24 While this setup works as expected in the testing environment for CPUs, it is not functioning as intended in production, and it is not effectively restricting node usage in the partition. Could anyone provide suggestions or guidance on how to properly implement node restrictions along with priority? Thank you for your assistance. Best regards, Manisha Yadav ------------------------------------------------------------------------------------------------------------ [ C-DAC is on Social-Media too. Kindly follow us at: Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] This e-mail is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies and the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email is strictly prohibited and appropriate legal action will be taken. ------------------------------------------------------------------------------------------------------------

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Node Health Check Program
by Paul Edmon 27 Aug '25

27 Aug '25

We've been using NHC (https://github.com/mej/nhc) for years with much success. However that project hasn't had a release in 2 years and the various Issues filed indicate that there might be problems with Rocky 9 (which we are looking to upgrade to). Do people that are at EL9 use NHC? Is there a fork? Is there a different code that people use for doing node health checks? -Paul Edmon-

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Slurm 25.05: Retrieving jobs GPU Indices on Heterogeneous Cluster
by David Gauchard 27 Aug '25

27 Aug '25

Hello, I'm running Slurm 25.05 on a heterogeneous cluster (several kind of GPU in the same node) with AutoDetect=nvml and shared mode. When submitting a job with `#SBATCH --gres=gpu:1`, CUDA_VISIBLE_DEVICES is correctly set to a single and valid free GPU index but `scontrol show jobid` does not report any detail about GPU allocation. How can I retrieve the GPU indices assigned to running jobs (reflecting CUDA_VISIBLE_DEVICES) in shared mode? Is there a Slurm command or configuration to enable tracking of these indices on a heterogeneous cluster? The goal is to help automatic choice of the free and appropriate gpu according to the job's needs in order to save bigger gpus for bigger jobs at the time of submitting. Thanks

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Issues with dynamic configless nodes and pam_slurm_adopt
by Leonardo Sala 26 Aug '25

26 Aug '25

Hallo everyone we have recently noticed that when running nodes in configless and dynamic mode, pam_slurm_adopt does not work properly, denying ssh access when the user has a running job. We traced down the issue to the fact that the dynamic nodes are registered with FQDN (e.g. c01.psi.ch), while pam_slurm_adopt uses this routine (https://github.com/SchedMD/slurm/blob/master/src/common/stepd_api.c#L181) to guess the stepd hostname, using the host short name (so, c01). If we use gethostname instead of gethostname_short then it works again. Has anybody experience with this, and is there a way to have dynamic configless nodes registering with the short hostname? Thanks! cheers leo -- Paul Scherrer Institut Dr. Leonardo Sala Group Leader Data Analysis and Research Infrastructure Group Leader Data Curation a.i. Deputy Department Head Science IT Infrastructure and Services department Science IT Infrastructure and Services department (AWI) OBBA/230 Forschungstrasse 111 5232 Villigen PSI Switzerland Phone: +41 56 310 3369 leonardo.sala(a)psi.ch www.psi.ch

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