STRIGGER(1)

NAME
strigger - Used 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 it's 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 occuring 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 insure that no trigger events are missed. 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 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

--block_err
    Trigger an event when a BlueGene block enters an ERROR state.

--clear
    Clear or delete a previously defined event trigger. The --id, --jobid or --userid option must be specified to identify the trigger(s) to be cleared.

-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.

--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.

-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).

-p, --program=path
    Execute the program at the specified fully qualified pathname when the event occurs. 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.

--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.

-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 associated with the specified user. 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

EXAMPLES
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
	/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). LLNL-CODE-402394.

This file is part of SLURM, a resource management program. For details, see <https://computing.llnl.gov/linux/slurm/>.

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.

SEE ALSO
scontrol(1), sinfo(1), squeue(1)