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 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

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

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

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

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

--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.

-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.

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

-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=type
    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.

-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.

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

-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.

-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.

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

-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).

-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
    /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
    /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) 2010-2013 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.

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