Provided by: slurm-client_23.02.3-2ubuntu1_amd64 
NAME
helpers.conf - Slurm configuration file for the helpers plugin.
DESCRIPTION
helpers.conf is an ASCII file which defines parameters used by Slurm's "helpers" node
feature plugin. The file will always be located in the same directory as the slurm.conf.
PARAMETERS
Parameter names are case insensitive. Any text following a "#" in the configuration file
is treated as a comment through the end of that line. The size of each line in the file
is limited to 1024 characters. Changes to the configuration file take effect upon restart
of Slurm daemons, daemon receipt of the SIGHUP signal, or execution of the command
"scontrol reconfigure" unless otherwise noted.
AllowUserBoot=<user1>[,<user2>...]
Controls which users are allowed to change the features with this plugin. Default
is to allow ALL users.
BootTime=<time>
Controls how much time a node has to reboot before a timeout occurs and a failure
is assumed. Default value is 300 seconds.
ExecTime=<time>
Controls how much time the Helper program can run before a timeout occurs and a
failure is assumed. Default value is 10 seconds.
Feature=<string> Helper=<file>
Defines Feature(s) and a corresponding Helper program that reports and modifies the
status of the feature(s). Multiple Feature entries are allowed, one for each
feature and corresponding program/script. A comma separated list of features can
also be defined for one Helper.
Features can be defined per node by creating a unique file for each node. The
controller must have a helpers.conf that lists all possible helper features.
A single helpers.conf can be created that defines features for specific nodes by
prepending NodeName=<nodelist> to the front of the Feature line. A Feature not
prepended with NodeName will apply to all nodes.
# helpers.conf
NodeName=n1_[1-10] Feature=a1,a2 Helper=/path/helper.sh
NodeName=n2_[1-10] Feature=b1,b2 Helper=/path/helper.sh
Feature=c1,c2 Helper=/path/helper.sh
If a feature is defined in the helpers.conf and is not defined on a specific node
in the helpers.conf but is defined for that node in the slurm.conf, that feature is
treated as a changeable/rebootable feature by the controller. For example, if
feature fa is defined on node node1 in the slurm.conf but is only listed on node2
in the helpers.conf, the feature will still trigger the node to be rebooted if not
active.
The Helper is an arbitrary program or script that reports and modifies the feature
set on a given node. The helpers are site-specific and are not included with Slurm.
Features modified by the helpers require a reboot of the node using the
RebootProgram. The Helper program/script must be executable by the SlurmdUser.
The same program/script can be used to control multiple features. slurmd will
execute the Helper in one of two ways:
1. Execute with no arguments to query the status of node features.
2. Execute with a single argument of the feature to be activated on node reboot.
MutuallyExclusive=<feature_list>
Prevents certain features from being specified for the same job. There can be
multiple MutuallyExclusive entries, each with their own list of features that are
mutually exclusive among themselves (i.e. features on one line are only mutually
exclusive with other features on the same line, but not mutually exclusive with
features on other lines).
EXAMPLE
/etc/slurm/slurm.conf:
To enable the helpers plugin, the slurm.conf needs to have the following entry:
NodeFeaturesPlugins=node_features/helpers
/etc/slurm/helpers.conf:
The following example helpers.conf demonstrates that multiple features can use the
same Helper script and that there can be multiple lists of features that are
mutually exclusive. For example, with the following configuration a job cannot
request both "nps1" and "nps2", nor can it request both "mig=on" and "mig=off".
However, it could request "nps1" and "mig=on" at the same time.
# helpers.conf
Feature=nps1,nps2,nps4 Helper=/usr/local/bin/nps
Feature=mig=on Helper=/usr/local/bin/mig
Feature=mig=off Helper=/usr/local/bin/mig
MutuallyExclusive=nps1,nps2,nps4
MutuallyExclusive=mig=on,mig=off
ExecTime=60
BootTime=60
AllowUserBoot=user1,user2
Example Helper script:
When the helper script is called with no arguments it should return the feature(s)
that are currently active for the node, with multiple features being new-line
delimited. When the helper script is called with a feature to be enabled for the
node, it should configure the node in a way that the specified feature will be
enabled when the node reboots. This example script just writes the active feature
name to a file but production scripts will probably be more complex.
#!/bin/bash
if [ "$1" = "nps1" ]; then
echo "$1" > /etc/slurm/feature
elif [ "$1" = "nps2" ]; then
echo "$1" > /etc/slurm/feature
elif [ "$1" = "nps4" ]; then
echo "$1" > /etc/slurm/feature
else
cat /etc/slurm/feature
fi
COPYING
Copyright (C) 2021 NVIDIA CORPORATION. All rights reserved.
Copyright (C) 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.
SEE ALSO
slurm.conf(5)