    \fBjob_container.conf\fP is an ASCII file which defines parameters used by
    Slurm's job_container/tmpfs plugin. The plugin reads the
    job_container.conf file to find out the configuration settings. Based on them it
    constructs a private (or optionally shared) filesystem namespace for the job and
    mounts a list of directories (defaults to /tmp and /dev/shm) inside it. This
    gives the job a private view of these directories.  These paths are mounted
    inside the location specified by 'BasePath' in the \fBjob_container.conf\fR
    file. When the job completes, the private namespace is unmounted and all
    files therein are automatically removed.
    To make use of this plugin, 'PrologFlags=Contain' must also be present in
    your \fBslurm.conf\fR file, as shown:

    .nf
    JobContainerType=job_container/tmpfs
    PrologFlags=Contain
    .fi

    The file will always be located in the same directory as the \fBslurm.conf\fR.

    .LP
    If using the \fBjob_container.conf\fR file to define a namespace available to
    nodes the first parameter on the line should be \fBNodeName\fR. If configuring a
    namespace without specifying nodes, the first parameter on the line
    should be \fBBasePath\fR.

    .LP
    Parameter names are case insensitive.
    Any text following a "#" in the configuration file is treated
    as a comment through the end of that line.
    Changes to the configuration file take effect upon restart of Slurm daemons.

    .LP
    The following job_container.conf parameters are defined to control the behavior
    of the job_container/tmpfs plugin.

    .TP
    \fBAutoBasePath\fR
    This determines if plugin should create the BasePath directory or not. Set it
    to 'true' if directory is not pre\-created before slurm startup. If set to true,
    the directory is created with permission 0755. Directory is not deleted during
    slurm shutdown. If set to 'false' or not specified, plugin would expect
    directory to exist. This option can be used on a global or per\-line basis.
    This parameter is optional.
    .IP

    .TP
    \fBBasePath\fR
    Specify the \fIPATH\fR that the tmpfs plugin should use as a base to mount the
    private directories. This path must be readable and writable by the plugin. The
    plugin constructs a directory for each job inside this path, which is then used
    for mounting. The \fBBasePath\fR gets mounted as 'private' during slurmd start
    and remains mounted until shutdown. The first "%h" within the name is replaced
    \fBDirs\fR
    A list of mount points separated with commas to create private mounts for.
    This parameter is optional and if not specified it defaults to "/tmp,/dev/shm".

    \fBNOTE\fR: /dev/shm has special handling, and instead of a bind mount is always
    a fresh tmpfs filesystem.
    .IP

    .TP
    \fBInitScript\fR
    Specify fully qualified pathname of an optional initialization script. This
    script is run before the namespace construction of a job. It can be used to
    make the job join additional namespaces prior to the construction of /tmp
    namespace or it can be used for any site\-specific setup. This parameter is
    optional.
    .IP

    .TP
    \fBNodeName\fR
    A NodeName specification can be used to permit one job_container.conf
    file to be used for all compute nodes in a cluster by specifying the node(s)
    that each line should apply to.
    The NodeName specification can use a Slurm hostlist specification as shown in
    the example below. This parameter is optional.
    .IP

    .TP
    \fBShared\fR
    Specifying Shared=true will propagate new mounts between the job specific
    filesystem namespace and the root filesystem namespace, enable using autofs on
    the node. This parameter is optional.
    .IP

    .SH "NOTES"
    .LP
    If any parameters in job_container.conf are changed while slurm is running, then
    slurmd on the respective nodes will need to be
    restarted for changes to take effect (scontrol reconfigure is not sufficient).
    Additionally this can be disruptive to
    jobs already running on the node. So care must be taken to make sure no jobs
    are running if any changes to job_container.conf are deployed.

    Restarting slurmd is safe and non\-disruptive to running jobs, as long as
    job_container.conf is not changed between restarts in which case above point
    applies.

    .SH "EXAMPLE"
    .TP
    \fB/etc/slurm/slurm.conf\fR:
    These are the entries required in \fBslurm.conf\fR to activate the
    job_container/tmpfs plugin.
    .IP
    The second sample file will define 2 basepaths.
    The first will only be on largemem[1\-2] and it will be automatically created.
    The second will only be on gpu[1\-10], will be expected to exist and will run
    an initscript before each job.
    .nf
    NodeName=largemem[1\-2] AutoBasePath=true BasePath=/var/nvme/storage_a
    NodeName=gpu[1\-10] BasePath=/var/nvme/storage_b InitScript=/etc/slurm/init.sh
    .fi

    The third sample file will Define 1 basepath that will be on all nodes,
    automatically created, with /tmp and /var/tmp as private mounts.
    .nf
    AutoBasePath=true
    BasePath=/var/nvme/storage Dirs=/tmp,/var/tmp
    .fi
    .IP

    .SH "COPYING"
    Copyright (C) 2021 Regents of the University of California
    Produced at Lawrence Berkeley National Laboratory
    .br
    Copyright (C) 2021\-2022 SchedMD LLC.

    .LP
    This file is part of Slurm, a resource management program.
    For details, see <https://slurm.schedmd.com/>.
    .LP
    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.
    .LP
    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.

    .SH "SEE ALSO"
    .LP

    \fBslurm.conf\fR(5)