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 filter: ing 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

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.

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