Hi, why you think it's an authentication requests? As far as I understand multiple UIDs are asking for job and partition info. It's unlikely that all of them perform that kind of requests the same way and in the same time, so I think you should look for some external program that may do that - i.e. some monitoring tool? Or reporting tool? I'm not sure if API calls are also registered as RPC in controller logs.
Dirty (but maybe effective) way of discovering what makes all of that calls is to set the RPC rate limit to some low value and see what stopped working ;) https://slurm.schedmd.com/slurm.conf.html#OPT_rl_enable
Regards Patryk.
On 25/05/06 02:38PM, Guillette, Jeremy via slurm-users wrote: [-- Type: text/plain; charset=Windows-1252, Encoding: quoted-printable, Size: 9.3K --]
Hello, I’m trying to figure out why we’ve been seeing an increase in network traffic in our AWS-based cluster, which uses Amazon’s parallel cluster tool. After an incident a couple weeks ago, I turned on debug2 logging on the slurmd processes, and I’m seeing huge numbers of `REQUEST_GETPW` and `REQUEST_GETGR` requests going to the slurmd processes. I briefly turned on debug2 logging for `slurmctld` as well, and I’m seeing lots of RPC calls, but not as many as the `REQUEST_GETPW` requests that I’ve seen on compute node slurmd processes. Here’s a sample from the slurmctld log:
[2025-04-28T15:11:05.436] debug2: _slurm_rpc_dump_partitions, size=1253 usec=20 [2025-04-28T15:11:05.450] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=2971 [2025-04-28T15:11:05.451] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=2971 [2025-04-28T15:11:05.451] debug2: _slurm_rpc_dump_partitions, size=1253 usec=16 [2025-04-28T15:11:05.461] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=2788 [2025-04-28T15:11:05.461] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=2788 [2025-04-28T15:11:05.461] debug2: _slurm_rpc_dump_partitions, size=1253 usec=12 [2025-04-28T15:11:05.517] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=2916 [2025-04-28T15:11:05.518] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=2916 [2025-04-28T15:11:05.518] debug2: _slurm_rpc_dump_partitions, size=1253 usec=14 [2025-04-28T15:11:05.628] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=3405 [2025-04-28T15:11:05.629] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=3405 [2025-04-28T15:11:05.629] debug2: _slurm_rpc_dump_partitions, size=1253 usec=14 [2025-04-28T15:11:05.740] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=2189 [2025-04-28T15:11:05.740] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=2189 [2025-04-28T15:11:05.740] debug2: _slurm_rpc_dump_partitions, size=1253 usec=15 [2025-04-28T15:11:05.845] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=2209 [2025-04-28T15:11:05.846] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=2209 [2025-04-28T15:11:05.846] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=4106 [2025-04-28T15:11:05.846] debug2: _slurm_rpc_dump_partitions, size=1253 usec=14 [2025-04-28T15:11:05.847] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=4106 [2025-04-28T15:11:05.847] debug2: _slurm_rpc_dump_partitions, size=1253 usec=11 [2025-04-28T15:11:05.938] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=3400 [2025-04-28T15:11:05.938] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=3400 [2025-04-28T15:11:05.938] debug2: _slurm_rpc_dump_partitions, size=1253 usec=18 [2025-04-28T15:11:06.903] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=3449 [2025-04-28T15:11:06.904] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=3449 [2025-04-28T15:11:06.904] debug2: _slurm_rpc_dump_partitions, size=1253 usec=15 [2025-04-28T15:11:07.175] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=3722 [2025-04-28T15:11:07.176] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=3722 [2025-04-28T15:11:07.177] debug2: _slurm_rpc_dump_partitions, size=1253 usec=254 [2025-04-28T15:11:07.205] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=4040 [2025-04-28T15:11:07.206] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=4040 [2025-04-28T15:11:07.206] debug2: _slurm_rpc_dump_partitions, size=1253 usec=17 [2025-04-28T15:11:07.237] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=2990 [2025-04-28T15:11:07.238] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=2990 [2025-04-28T15:11:07.239] debug2: _slurm_rpc_dump_partitions, size=1253 usec=15 [2025-04-28T15:11:07.284] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=2920 [2025-04-28T15:11:07.285] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=2920 [2025-04-28T15:11:07.285] debug2: _slurm_rpc_dump_partitions, size=1253 usec=15 [2025-04-28T15:11:07.370] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=3236 [2025-04-28T15:11:07.371] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=3236 [2025-04-28T15:11:07.371] debug2: _slurm_rpc_dump_partitions, size=1253 usec=17 [2025-04-28T15:11:08.463] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=2848 [2025-04-28T15:11:08.464] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=2848 [2025-04-28T15:11:08.464] debug2: _slurm_rpc_dump_partitions, size=1253 usec=14 [2025-04-28T15:11:08.691] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=2627 [2025-04-28T15:11:08.692] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=2627 [2025-04-28T15:11:08.692] debug2: _slurm_rpc_dump_partitions, size=1253 usec=18 [2025-04-28T15:11:08.873] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=3729 [2025-04-28T15:11:08.874] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=3729 [2025-04-28T15:11:08.875] debug2: _slurm_rpc_dump_partitions, size=1253 usec=196 [2025-04-28T15:11:08.881] debug2: Processing RPC: REQUEST_JOB_INFO_SINGLE from UID=3461 [2025-04-28T15:11:08.882] debug2: Processing RPC: REQUEST_PARTITION_INFO from UID=3461 [2025-04-28T15:11:08.882] debug2: _slurm_rpc_dump_partitions, size=1253 usec=10And from slurmd:
[2025-04-27T19:45:01.353] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.475] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.491] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.496] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.496] [59253.batch] debug: Handling REQUEST_GETGR [2025-04-27T19:45:02.497] [59253.batch] debug: Handling REQUEST_GETGR [2025-04-27T19:45:02.497] [59253.batch] debug: Handling REQUEST_GETGR [2025-04-27T19:45:02.501] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.504] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.507] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.513] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.518] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.518] [59253.batch] debug: Handling REQUEST_GETGR [2025-04-27T19:45:02.606] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:02.607] [59253.batch] debug: Handling REQUEST_GETGR [2025-04-27T19:45:04.988] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:04.992] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:04.995] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:04.999] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.011] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.016] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.033] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.045] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.048] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.057] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.073] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.077] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.110] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.143] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.143] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.144] [59253.batch] debug: Handling REQUEST_GETGR [2025-04-27T19:45:05.152] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.152] [59253.batch] debug: Handling REQUEST_GETGR [2025-04-27T19:45:05.159] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.159] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.159] [59253.batch] debug: Handling REQUEST_GETGR [2025-04-27T19:45:05.167] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.167] [59253.batch] debug: Handling REQUEST_GETGR [2025-04-27T19:45:05.170] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.172] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.174] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.203] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.204] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.207] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.316] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.318] [59253.batch] debug: Handling REQUEST_GETPW [2025-04-27T19:45:05.321] [59253.batch] debug: Handling REQUEST_GETPWThis level of debugging makes the logs pretty huge, but if seeing a whole log file is helpful, I can make something available. Any ideas on next steps for figuring out what’s going on? It seems like something is asking for authentication a whole lot, but it’s not clear to me what or why. We do use munge for Slurm authentication, and SSSD to work with LDAP for user authentication. -Jeremy Guillette —
Jeremy Guillette
Software Engineer, FAS Academic Technology | Academic Technology Harvard University Information Technology P: (617) 998-1826 | W: huit.harvard.edu (he/him/his)
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