[slurm-users] [EXTERNAL] Re: trying to diagnose a connectivity issue between the slurmctld process and the slurmd nodes

Thu Nov 26 18:01:25 UTC 2020

Thanks Andy

Firewall is off on all three system. Also if they could not communicate, I do not think 'scontrol show node' would not return the data that is does. And the logs would not show responses as indicated below

And the names are correct, used the recommended 'hostname -s' when configuring the slurm.conf node entries.
In fact slurm seems to be case sensitive, which surprised the heck out of me

From: slurm-users <slurm-users-bounces at lists.schedmd.com> On Behalf Of Andy Riebs
Sent: Thursday, November 26, 2020 12:50
To: slurm-users at lists.schedmd.com
Subject: [EXTERNAL] Re: [slurm-users] trying to diagnose a connectivity issue between the slurmctld process and the slurmd nodes

  1.  Look for a firewall on all of your slurm -- they almost always break slurm communications.
  2.  Confirm that "ssh srvgridslurm01 hostname" returns, exactly, "srvgridslurm01"

Andy
On 11/26/2020 12:21 PM, Steve Bland wrote:

Sinfo always returns nodes not responding
[root at srvgridslurm03 ~]# sinfo -R
REASON               USER      TIMESTAMP           NODELIST
Not responding       slurm     2020-11-26T09:12:58 SRVGRIDSLURM01
Not responding       slurm     2020-11-26T08:27:58 SRVGRIDSLURM02
Not responding       slurm     2020-11-26T10:00:14 srvgridslurm03

By tailing the log for slurmctld,  I can see when a node is recognized
Node srvgridslurm03 now responding

By turning up the logging levels I can see comm between slurmctld and the nodes and there appears to be a response

[2020-11-26T12:05:14.333] debug3: Tree sending to SRVGRIDSLURM01
[2020-11-26T12:05:14.333] debug2: Tree head got back 0 looking for 3
[2020-11-26T12:05:14.333] debug3: Tree sending to SRVGRIDSLURM02
[2020-11-26T12:05:14.333] debug3: Tree sending to srvgridslurm03
[2020-11-26T12:05:14.335] debug2: Tree head got back 1
[2020-11-26T12:05:14.335] debug2: Tree head got back 2
[2020-11-26T12:05:14.336] debug2: Tree head got back 3
[2020-11-26T12:05:14.338] debug2: node_did_resp SRVGRIDSLURM01
[2020-11-26T12:05:14.338] debug2: node_did_resp SRVGRIDSLURM02
[2020-11-26T12:05:14.338] debug2: node_did_resp srvgridslurm03

What I do not understand is the disjoint. It seems to record responses, but flags the node as not responding - all nodes. There are only three right now as this is a test environment. 3 Centos7 systems

[root at SRVGRIDSLURM01 ~]# scontrol show node
NodeName=SRVGRIDSLURM01 Arch=x86_64 CoresPerSocket=4
   CPUAlloc=0 CPUTot=4 CPULoad=0.01
   AvailableFeatures=(null)
   ActiveFeatures=(null)
   Gres=(null)
   NodeAddr=SRVGRIDSLURM01 NodeHostName=SRVGRIDSLURM01 Version=20.11.0
   OS=Linux 3.10.0-1160.2.2.el7.x86_64 #1 SMP Tue Oct 20 16:53:08 UTC 2020
   RealMemory=7821 AllocMem=0 FreeMem=5211 Sockets=1 Boards=1
   State=DOWN ThreadsPerCore=1 TmpDisk=0 Weight=1 Owner=N/A MCS_label=N/A
   Partitions=debug
   BootTime=2020-11-24T08:04:25 SlurmdStartTime=2020-11-26T11:38:25
   CfgTRES=cpu=4,mem=7821M,billing=4
   AllocTRES=
   CapWatts=n/a
   CurrentWatts=0 AveWatts=0
   ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/s
   Reason=Not responding [slurm at 2020-11-26T09:12:58]
   Comment=(null)

NodeName=SRVGRIDSLURM02 Arch=x86_64 CoresPerSocket=4
   CPUAlloc=0 CPUTot=4 CPULoad=0.01
   AvailableFeatures=(null)
   ActiveFeatures=(null)
   Gres=(null)
   NodeAddr=SRVGRIDSLURM02 NodeHostName=SRVGRIDSLURM02 Version=20.11.0
   OS=Linux 3.10.0-1160.2.2.el7.x86_64 #1 SMP Tue Oct 20 16:53:08 UTC 2020
   RealMemory=7821 AllocMem=0 FreeMem=6900 Sockets=1 Boards=1
   State=DOWN ThreadsPerCore=1 TmpDisk=0 Weight=1 Owner=N/A MCS_label=N/A
   Partitions=debug
   BootTime=2020-11-24T08:04:32 SlurmdStartTime=2020-11-26T10:31:08
   CfgTRES=cpu=4,mem=7821M,billing=4
   AllocTRES=
   CapWatts=n/a
   CurrentWatts=0 AveWatts=0
   ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/s
   Reason=Not responding [slurm at 2020-11-26T08:27:58]
   Comment=(null)

NodeName=srvgridslurm03 Arch=x86_64 CoresPerSocket=4
   CPUAlloc=0 CPUTot=4 CPULoad=0.01
   AvailableFeatures=(null)
   ActiveFeatures=(null)
   Gres=(null)
   NodeAddr=srvgridslurm03 NodeHostName=srvgridslurm03 Version=20.11.0
   OS=Linux 3.10.0-1160.2.2.el7.x86_64 #1 SMP Tue Oct 20 16:53:08 UTC 2020
   RealMemory=7821 AllocMem=0 FreeMem=7170 Sockets=1 Boards=1
   State=DOWN ThreadsPerCore=1 TmpDisk=0 Weight=1 Owner=N/A MCS_label=N/A
   Partitions=debug
   BootTime=2020-11-26T09:46:49 SlurmdStartTime=2020-11-26T11:55:23
   CfgTRES=cpu=4,mem=7821M,billing=4
   AllocTRES=
   CapWatts=n/a
   CurrentWatts=0 AveWatts=0
   ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/s
   Reason=Not responding [slurm at 2020-11-26T10:00:14]
   Comment=(null)

Any suggestions? Thanks

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