Ubuntu Manpage: slurmctld - The central management daemon of Slurm.

NAME

       slurmctld - The central management daemon of Slurm.

SYNOPSIS

       slurmctld [OPTIONS...]

DESCRIPTION

       slurmctld  is  the central management daemon of Slurm. It monitors all other Slurm daemons and resources,
       accepts work (jobs), and  allocates  resources  to  those  jobs.  Given  the  critical  functionality  of
       slurmctld,  there  may  be a backup server to assume these functions in the event that the primary server
       fails.

OPTIONS

-c Clear all previous slurmctld state from its last checkpoint. With this option, all jobs,
including both running and queued, and all node states, will be deleted. Without this option,
previously running jobs will be preserved along with node State of DOWN, DRAINED and DRAINING
nodes and the associated Reason field for those nodes. NOTE: It is rare you would ever want to
use this in production as all jobs will be killed.

-D Run slurmctld in the foreground with logging copied to stdout. This limits the resilience of
'scontrol reconfigure' and should be avoided in production.

-f <file>
Read configuration from the specified file. See NOTES below.

-h Help; print a brief summary of command options.

-i Ignore errors found while reading in state files on startup. Warning: Use of this option will
mean losing the data that wasn't recovered from the state files.

-L <file>
Write log messages to the specified file.

-n <value>
Set the daemon's nice value to the specified value, typically a negative number.

-r Recover partial state from last checkpoint: jobs and node DOWN/DRAIN state and reason information
state. No partition state is recovered. This is the default action.

-R Recover full state from last checkpoint: jobs, node, partition state, and power save settings.
Without this option, previously running jobs will be preserved along with node State of DOWN,
DRAINED and DRAINING nodes and the associated Reason field for those nodes. No other node or
partition state will be preserved.

-s Change working directory of slurmctld to SlurmctldLogFile path if possible, or to Slurm's
StateSaveLocation otherwise. If both of them fail it will fallback to /var/tmp.

--systemd
Use when starting the daemon with systemd. This will allow slurmctld to notify systemd of the new
PID when using 'scontrol reconfigure'.

NOTE: The User and Group options in the slurmctld's systemd unit file need to both specify the
SlurmUser.

-v Verbose operation. Multiple v's can be specified, with each 'v' beyond the first increasing
verbosity, up to 6 times (i.e. -vvvvvv).

-V Print version information and exit.

ENVIRONMENT VARIABLES

       The following environment variables can be used to override settings compiled into slurmctld.

       SLURM_CONF          The location of the Slurm configuration file. This is overridden by explicitly naming
                           a configuration file on the command line.

       SLURM_DEBUG_FLAGS   Specify debug flags for the scheduler to use. See DebugFlags in the slurm.conf(5) man
                           page for a full list of flags. The environment variable  takes  precedence  over  the
                           setting in the slurm.conf.

CORE FILE LOCATION

       If  slurmctld  is  started  with  the -D option then the core file will be written to the current working
       directory.  Otherwise if SlurmctldLogFile is a fully qualified path name (starting  with  a  slash),  the
       core  file will be written to the same directory as the log file, provided SlurmUser has write permission
       on the directory.  Otherwise the core file will be written to the StateSaveLocation, or "/var/tmp/" as  a
       last  resort.  If none of the above directories have write permission for SlurmUser, no core file will be
       produced.

SIGNALS

       SIGTERM SIGINT SIGQUIT
              slurmctld will shutdown cleanly, saving its current state to the state save directory.

       SIGABRT
              slurmctld will shutdown cleanly, saving its current state, and perform a core dump.

       SIGHUP Reloads the slurm configuration files, similar to 'scontrol reconfigure'.

       SIGUSR2
              Reread the log level from the configs, and then reopen the log file.  This  should  be  used  when
              setting up logrotate(8).

       SIGCHLD SIGUSR1 SIGTSTP SIGXCPU SIGPIPE SIGALRM
              These signals are explicitly ignored.

NOTES

       It  may  be  useful  to  experiment  with  different  slurmctld specific configuration parameters using a
       distinct configuration file (e.g. timeouts). However, this special configuration file will not be used by
       the slurmd daemon or the Slurm programs, unless you specifically tell each of them  to  use  it.  If  you
       desire  changing communication ports, the location of the temporary file system, or other parameters used
       by other Slurm components, change the common configuration file, slurm.conf.

COPYING

       Copyright (C) 2002-2007 The Regents of the University of California.  Copyright  (C)  2008-2010  Lawrence
       Livermore  National  Security.   Copyright  (C)  2010-2022  SchedMD  LLC.  Produced at Lawrence Livermore
       National Laboratory (cf, DISCLAIMER).  CODE-OCEC-09-009. All rights reserved.

       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.