Ubuntu Manpage: strigger - Used to set, get or clear Slurm trigger information.

Provided by: slurm-client_21.08.5-2ubuntu1_amd64

NAME

       strigger - Used to set, get or clear Slurm trigger information.

SYNOPSIS

       strigger --set   [OPTIONS...]
       strigger --get   [OPTIONS...]
       strigger --clear [OPTIONS...]

DESCRIPTION

       strigger  is used to set, get or clear Slurm trigger information.  Triggers include events
       such as a node failing, a job reaching its time limit or a job terminating.  These  events
       can  cause  actions  such  as  the execution of an arbitrary script.  Typical uses include
       notifying system administrators of node failures and gracefully terminating a job when its
       time  limit is approaching.  A hostlist expression for the nodelist or job ID is passed as
       an argument to the program.

       Trigger events are not processed instantly, but a check is performed for trigger events on
       a periodic basis (currently every 15 seconds).  Any trigger events which occur within that
       interval will be compared against the  trigger  programs  set  at  the  end  of  the  time
       interval.   The  trigger  program  will  be  executed once for any event occurring in that
       interval.  The record of those events (e.g. nodes which  went  DOWN  in  the  previous  15
       seconds)  will then be cleared.  The trigger program must set a new trigger before the end
       of the next interval to ensure that no trigger events are missed OR the  trigger  must  be
       created  with an argument of "--flags=PERM".  If desired, multiple trigger programs can be
       set for the same event.

       IMPORTANT NOTE: This command can only set triggers if run by  the  user  SlurmUser  unless
       SlurmUser  is  configured  as user root.  This is required for the slurmctld daemon to set
       the appropriate user and group IDs for the executed program.  Also note that  the  trigger
       program  is  executed  on  the  same  node that the slurmctld daemon uses rather than some
       allocated compute node.  To check the value of SlurmUser, run the command:

              scontrol show config | grep SlurmUser

ARGUMENTS

-C, --backup_slurmctld_assumed_control
Trigger event when backup slurmctld assumes control.

-B, --backup_slurmctld_failure
Trigger an event when the backup slurmctld fails.

-c, --backup_slurmctld_resumed_operation
Trigger an event when the backup slurmctld resumes operation after failure.

--burst_buffer
Trigger event when burst buffer error occurs.

--clear
Clear or delete a previously defined event trigger. The --id, --jobid or --user
option must be specified to identify the trigger(s) to be cleared. Only user root
or the trigger's creator can delete a trigger.

-M, --clusters=<string>
Clusters to issue commands to. Note that the SlurmDBD must be up for this option
to work properly.

-d, --down
Trigger an event if the specified node goes into a DOWN state.

-D, --drained
Trigger an event if the specified node goes into a DRAINED state.

-F, --fail
Trigger an event if the specified node goes into a FAILING state.

-f, --fini
Trigger an event when the specified job completes execution.

--flags=<flag>
Associate flags with the reservation. Multiple flags should be comma separated.
Valid flags include:

PERM Make the trigger permanent. Do not purge it after the event occurs.

--front_end
Trigger events based upon changes in state of front end nodes rather than compute
nodes. Applies to Cray ALPS architectures only, where the slurmd daemon executes on
front end nodes rather than the compute nodes. Use this option with either the
--up or --down option.

--get Show registered event triggers. Options can be used for filtering purposes.

-i, --id=<id>
Trigger ID number.

-I, --idle
Trigger an event if the specified node remains in an IDLE state for at least the
time period specified by the --offset option. This can be useful to hibernate a
node that remains idle, thus reducing power consumption.

-j, --jobid=<id>
Job ID of interest. NOTE: The --jobid option can not be used in conjunction with
the --node option. When the --jobid option is used in conjunction with the --up or
--down option, all nodes allocated to that job will considered the nodes used as a
trigger event.

-n, --node[=host]
Host name(s) of interest. By default, all nodes associated with the job (if
--jobid is specified) or on the system are considered for event triggers. NOTE:
The --node option can not be used in conjunction with the --jobid option. When the
--jobid option is used in conjunction with the --up, --down or --drained option,
all nodes allocated to that job will considered the nodes used as a trigger event.
Since this option's argument is optional, for proper parsing the single letter
option must be followed immediately with the value and not include a space between
them. For example "-ntux" and not "-n tux".

-N, --noheader
Do not print the header when displaying a list of triggers.

-o, --offset=<seconds>
The specified action should follow the event by this time interval. Specify a
negative value if action should preceded the event. The default value is zero if
no --offset option is specified. The resolution of this time is about 20 seconds,
so to execute a script not less than five minutes prior to a job reaching its time
limit, specify --offset=320 (5 minutes plus 20 seconds).

-h, --primary_database_failure
Trigger an event when the primary database fails. This event is triggered when the
accounting plugin tries to open a connection with mysql and it fails and the
slurmctld needs the database for some operations.

-H, --primary_database_resumed_operation
Trigger an event when the primary database resumes operation after failure. It
happens when the connection to mysql from the accounting plugin is restored.

-g, --primary_slurmdbd_failure
Trigger an event when the primary slurmdbd fails. The trigger is launched by
slurmctld in the occasions it tries to connect to slurmdbd, but receives no
response on the socket.

-G, --primary_slurmdbd_resumed_operation
Trigger an event when the primary slurmdbd resumes operation after failure. This
event is triggered when opening the connection from slurmctld to slurmdbd results
in a response. It can happen also in different situations, periodically every 15
seconds when checking the connection status, when saving state, when agent queue is
filling, and so on.

-e, --primary_slurmctld_acct_buffer_full
Trigger an event when primary slurmctld accounting buffer is full.

-a, --primary_slurmctld_failure
Trigger an event when the primary slurmctld fails.

-b, --primary_slurmctld_resumed_control
Trigger an event when primary slurmctld resumes control.

-A, --primary_slurmctld_resumed_operation
Trigger an event when the primary slurmctld resuming operation after failure.

-p, --program=<path>
Execute the program at the specified fully qualified pathname when the event
occurs. You may quote the path and include extra program arguments if desired.
The program will be executed as the user who sets the trigger. If the program
fails to terminate within 5 minutes, it will be killed along with any spawned
processes.

-Q, --quiet
Do not report non-fatal errors. This can be useful to clear triggers which may
have already been purged.

-r, --reconfig
Trigger an event when the system configuration changes. This is triggered when the
slurmctld daemon reads its configuration file or when a node state changes.

--set Register an event trigger based upon the supplied options. NOTE: An event is only
triggered once. A new event trigger must be set established for future events of
the same type to be processed. Triggers can only be set if the command is run by
the user SlurmUser unless SlurmUser is configured as user root.

-t, --time
Trigger an event when the specified job's time limit is reached. This must be used
in conjunction with the --jobid option.

-u, --up
Trigger an event if the specified node is returned to service from a DOWN state.

--user=<user_name_or_id>
Clear or get triggers created by the specified user. For example, a trigger
created by user root for a job created by user adam could be cleared with an option
--user=root. Specify either a user name or user ID.

-v, --verbose
Print detailed event logging. This includes time-stamps on data structures, record
counts, etc.

-V , --version
Print version information and exit.

OUTPUT FIELD DESCRIPTIONS

       TRIG_ID
              Trigger ID number.

       RES_TYPE
              Resource type: job or node

       RES_ID Resource ID: job ID or host names or "*" for any host

       TYPE   Trigger  type:  time  or  fini  (for jobs only), down or up (for jobs or nodes), or
              drained, idle or reconfig (for nodes only)

       OFFSET Time offset in seconds. Negative numbers indicated the action should  occur  before
              the event (if possible)

       USER   Name of the user requesting the action

       PROGRAM
              Pathname of the program to execute when the event occurs

PERFORMANCE

       Executing  strigger  sends  a  remote  procedure  call  to slurmctld. If enough calls from
       strigger or other Slurm client commands that send remote procedure calls to the  slurmctld
       daemon  come  in  at  once, it can result in a degradation of performance of the slurmctld
       daemon, possibly resulting in a denial of service.

       Do not run strigger or other Slurm client commands that send  remote  procedure  calls  to
       slurmctld  from loops in shell scripts or other programs. Ensure that programs limit calls
       to strigger to the minimum necessary for the information you are trying to gather.

ENVIRONMENT VARIABLES

       Some strigger options may be set via environment variables. These  environment  variables,
       along  with  their  corresponding  options, are listed below.  (Note: Command line options
       will always override these settings.)

       SLURM_CONF          The location of the Slurm configuration file.

EXAMPLES

       Execute the program "/usr/sbin/primary_slurmctld_failure" whenever the  primary  slurmctld
       fails.

              $ cat /usr/sbin/primary_slurmctld_failure
              #!/bin/bash
              # Submit trigger for next primary slurmctld failure event
              strigger --set --primary_slurmctld_failure \
                       --program=/usr/sbin/primary_slurmctld_failure
              # Notify the administrator of the failure using e-mail
              /usr/bin/mail slurm_admin@site.com -s Primary_SLURMCTLD_FAILURE

              $ strigger --set --primary_slurmctld_failure \
                         --program=/usr/sbin/primary_slurmctld_failure

       Execute  the  program "/usr/sbin/slurm_admin_notify" whenever any node in the cluster goes
       down. The subject line will include the node names  which  have  entered  the  down  state
       (passed as an argument to the script by Slurm).

              $ cat /usr/sbin/slurm_admin_notify
              #!/bin/bash
              # Submit trigger for next event
              strigger --set --node --down \
                       --program=/usr/sbin/slurm_admin_notify
              # Notify administrator using by e-mail
              /usr/bin/mail slurm_admin@site.com -s NodesDown:$*

              $ strigger --set --node --down \
                         --program=/usr/sbin/slurm_admin_notify

       Execute  the  program  "/usr/sbin/slurm_suspend_node"  whenever  any  node  in the cluster
       remains in the idle state for at least 600 seconds.

              $ strigger --set --node --idle --offset=600 \
                         --program=/usr/sbin/slurm_suspend_node

       Execute the program "/home/joe/clean_up" when job 1234 is within 10  minutes  of  reaching
       its time limit.

              $ strigger --set --jobid=1234 --time --offset=-600 \
                         --program=/home/joe/clean_up

       Execute  the  program "/home/joe/node_died" when any node allocated to job 1234 enters the
       DOWN state.

              $ strigger --set --jobid=1234 --down \
                         --program=/home/joe/node_died

       Show all triggers associated with job 1235.

              $ strigger --get --jobid=1235
              TRIG_ID RES_TYPE RES_ID TYPE OFFSET USER PROGRAM
                  123      job   1235 time   -600  joe /home/bob/clean_up
                  125      job   1235 down      0  joe /home/bob/node_died

       Delete event trigger 125.

              $ strigger --clear --id=125

       Execute /home/joe/job_fini upon completion of job 1237.

              $ strigger --set --jobid=1237 --fini --program=/home/joe/job_fini

COPYING

       Copyright (C) 2007 The Regents of the University  of  California.   Produced  at  Lawrence
       Livermore National Laboratory (cf, DISCLAIMER).
       Copyright (C) 2008-2010 Lawrence Livermore National Security.
       Copyright (C) 2010-2021 SchedMD LLC.

       This   file   is  part  of  Slurm,  a  resource  management  program.   For  details,  see
       <https://slurm.schedmd.com/>.

       Slurm is free software; you can redistribute it and/or modify it under the  terms  of  the
       GNU  General Public License as published by the Free Software Foundation; either version 2
       of the License, or (at your option) any later version.

       Slurm is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
       even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
       GNU General Public License for more details.