doc/man/man1/scrun.1

.TH scrun "1" "Slurm Commands" "January 2025" "Slurm Commands"

.SH "NAME"
\fBscrun\fR \- an OCI runtime proxy for Slurm.

.SH "SYNOPSIS"

.TP
.SH Create Operation
\fBscrun\fR [\fIGLOBAL OPTIONS\fR...] \fIcreate\fR [\fICREATE OPTIONS\fR] <\fIcontainer-id\fR>
.IP
Prepares a new container with container-id in current working directory.
.RE

.TP
.SH Start Operation
\fBscrun\fR [\fIGLOBAL OPTIONS\fR...] \fIstart\fR <\fIcontainer-id\fR>
.IP
Request to start and run container in job.
.RE

.TP
.SH Query State Operation
\fBscrun\fR [\fIGLOBAL OPTIONS\fR...] \fIstate\fR <\fIcontainer-id\fR>
.IP
Output OCI defined JSON state of container.
.RE

.TP
.SH Kill Operation
\fBscrun\fR [\fIGLOBAL OPTIONS\fR...] \fIkill\fR <\fIcontainer-id\fR> [\fIsignal\fR]
.IP
Send signal (default: SIGTERM) to container.
.RE

.TP
.SH Delete Operation
\fBscrun\fR [\fIGLOBAL OPTIONS\fR...] \fIdelete\fR [\fIDELETE OPTIONS\fR] <\fIcontainer-id\fR>
.IP
Release any resources held by container locally and remotely.
.RE

Perform OCI runtime operations against \fIcontainer-id\fR per:
.br
https://github.com/opencontainers/runtime-spec/blob/main/runtime.md

\fBscrun\fR attempts to mimic the commandline behavior as closely as possible
to \fBcrun\fR and \fBrunc\fR in order to maintain in place replacement
compatibility with \fBDOCKER\fR and \fBpodman\fR. All commandline
arguments for \fBcrun\fR and \fBrunc\fR will be accepted for compatibility
but may be ignored depending on their applicability.

.SH "DESCRIPTION"
\fBscrun\fR is an OCI runtime proxy for Slurm. It acts as a common interface to
\fBDOCKER\fR or \fBpodman\fR to allow container operations to be executed
under Slurm as jobs. \fBscrun\fR will accept all commands as an OCI compliant
runtime but will proxy the container and all STDIO to Slurm for scheduling and
execution. The containers will be executed remotely on Slurm compute nodes
according to settings in
\fBoci.conf\fR(5).

\fBscrun\fR requires all containers to be OCI image compliant per:
.br
https://github.com/opencontainers/image-spec/blob/main/spec.md

.SH "RETURN VALUE"
On successful operation, \fBscrun\fR will return 0. For any other condition
\fBscrun\fR will return any non-zero number to denote a error.

.SH "GLOBAL OPTIONS"

.TP
\fB\-\-cgroup\-manager\fR
Ignored.
.IP

.TP
\fB\-\-debug\fR
Activate debug level logging.
.IP

.TP
\fB\-f\fR <\fIslurm_conf_path\fR>
Use specified slurm.conf for configuration.
.br
Default: sysconfdir from \fBconfigure\fR during compilation
.IP

.TP
\fB\-\-usage\fR
Show quick help on how to call \fBscrun\fR
.IP

.TP
\fB\-\-log\-format\fR=<\fIjson|text\fR>
Optional select format for logging. May be "json" or "text".
.br
Default: text
.IP

.TP
\fB\-\-root\fR=<\fIroot_path\fR>
Path to spool directory to communication sockets and temporary directories and
files. This should be a tmpfs and should be cleared on reboot.
.br
Default: /run/user/\fI{user_id}\fR/scrun/
.IP

.TP
\fB\-\-rootless\fR
Ignored. All \fBscrun\fR commands are always rootless.
.IP

.TP
\fB\-\-systemd\-cgroup\fR
Ignored.
.IP

.TP
\fB\-v\fR
Increase logging verbosity. Multiple -v's increase verbosity.
.IP

.TP
\fB\-V\fR, \fB\-\-version\fR
Print version information and exit.
.IP

.SH "CREATE OPTIONS"

.TP
\fB\-b\fR <\fIbundle_path\fR>, \fB\-\-bundle\fR=<\fIbundle_path\fR>
Path to the root of the bundle directory.
.br
Default: caller's working directory
.IP

.TP
\fB\-\-console\-socket\fR=<\fIconsole_socket_path\fR>
Optional path to an AF_UNIX socket which will receive a file descriptor
referencing the master end of the console's pseudoterminal.
.br
Default: \fIignored\fR
.IP

.TP
\fB\-\-no\-pivot\fR
Ignored.
.IP

.TP
\fB\-\-no\-new\-keyring\fR
Ignored.
.IP

.TP
\fB\-\-pid\-file\fR=<\fIpid_file_path\fR>
Specify the file to lock and populate with process ID.
.br
Default: \fIignored\fR
.IP

.TP
\fB\-\-preserve\-fds\fR
Ignored.
.IP

.SH "DELETE OPTIONS"

.TP
\fB\-\-force\fR
Ignored. All delete requests are forced and will kill any running jobs.
.IP

.SH "INPUT ENVIRONMENT VARIABLES"

.TP
\fBSCRUN_DEBUG\fR=<quiet|fatal|error|info|verbose|debug|debug2|debug3|debug4|debug5>
Set logging level.
.IP

.TP
\fBSCRUN_STDERR_DEBUG\fR=<quiet|fatal|error|info|verbose|debug|debug2|debug3|debug4|debug5>
Set logging level for standard error output only.
.IP

.TP
\fBSCRUN_SYSLOG_DEBUG\fR=<quiet|fatal|error|info|verbose|debug|debug2|debug3|debug4|debug5>
Set logging level for syslogging only.
.IP

.TP
\fBSCRUN_FILE_DEBUG\fR=<quiet|fatal|error|info|verbose|debug|debug2|debug3|debug4|debug5>
Set logging level for log file only.
.IP

.SH "JOB INPUT ENVIRONMENT VARIABLES"

.TP
\fBSCRUN_ACCOUNT\fR
See \fBSLURM_ACCOUNT\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_ACCTG_FREQ\fR
See \fBSLURM_ACCTG_FREQ\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_BURST_BUFFER\fR
See \fBSLURM_BURST_BUFFER\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_CLUSTER_CONSTRAINT\fR
See \fBSLURM_CLUSTER_CONSTRAINT\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_CLUSTERS\fR
See \fBSLURM_CLUSTERS\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_CONSTRAINT\fR
See \fBSLURM_CONSTRAINT\fR from \fBsrun\fR(1).
.IP

.TP
\fBSLURM_CORE_SPEC\fR
See \fBSLURM_ACCOUNT\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_CPU_BIND\fR
See \fBSLURM_CPU_BIND\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_CPU_FREQ_REQ\fR
See \fBSLURM_CPU_FREQ_REQ\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_CPUS_PER_GPU\fR
See \fBSLURM_CPUS_PER_GPU\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_CPUS_PER_TASK\fR
See \fBSRUN_CPUS_PER_TASK\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_DELAY_BOOT\fR
See \fBSLURM_DELAY_BOOT\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_DEPENDENCY\fR
See \fBSLURM_DEPENDENCY\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_DISTRIBUTION\fR
See \fBSLURM_DISTRIBUTION\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_EPILOG\fR
See \fBSLURM_EPILOG\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_EXACT\fR
See \fBSLURM_EXACT\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_EXCLUSIVE\fR
See \fBSLURM_EXCLUSIVE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_GPU_BIND\fR
See \fBSLURM_GPU_BIND\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_GPU_FREQ\fR
See \fBSLURM_GPU_FREQ\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_GPUS\fR
See \fBSLURM_GPUS\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_GPUS_PER_NODE\fR
See \fBSLURM_GPUS_PER_NODE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_GPUS_PER_SOCKET\fR
See \fBSLURM_GPUS_PER_SOCKET\fR from \fBsalloc\fR(1).
.IP

.TP
\fBSCRUN_GPUS_PER_TASK\fR
See \fBSLURM_GPUS_PER_TASK\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_GRES_FLAGS\fR
See \fBSLURM_GRES_FLAGS\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_GRES\fR
See \fBSLURM_GRES\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_HINT\fR
See \fBSLURM_HIST\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_JOB_NAME\fR
See \fBSLURM_JOB_NAME\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_JOB_NODELIST\fR
See \fBSLURM_JOB_NODELIST\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_JOB_NUM_NODES\fR
See \fBSLURM_JOB_NUM_NODES\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_LABELIO\fR
See \fBSLURM_LABELIO\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_MEM_BIND\fR
See \fBSLURM_MEM_BIND\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_MEM_PER_CPU\fR
See \fBSLURM_MEM_PER_CPU\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_MEM_PER_GPU\fR
See \fBSLURM_MEM_PER_GPU\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_MEM_PER_NODE\fR
See \fBSLURM_MEM_PER_NODE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_MPI_TYPE\fR
See \fBSLURM_MPI_TYPE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_NCORES_PER_SOCKET\fR
See \fBSLURM_NCORES_PER_SOCKET\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_NETWORK\fR
See \fBSLURM_NETWORK\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_NSOCKETS_PER_NODE\fR
See \fBSLURM_NSOCKETS_PER_NODE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_NTASKS\fR
See \fBSLURM_NTASKS\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_NTASKS_PER_CORE\fR
See \fBSLURM_NTASKS_PER_CORE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_NTASKS_PER_GPU\fR
See \fBSLURM_NTASKS_PER_GPU\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_NTASKS_PER_NODE\fR
See \fBSLURM_NTASKS_PER_NODE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_NTASKS_PER_TRES\fR
See \fBSLURM_NTASKS_PER_TRES\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_OPEN_MODE\fR
See \fBSLURM_MODE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_OVERCOMMIT\fR
See \fBSLURM_OVERCOMMIT\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_OVERLAP\fR
See \fBSLURM_OVERLAP\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_PARTITION\fR
See \fBSLURM_PARTITION\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_POWER\fR
See \fBSLURM_POWER\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_PROFILE\fR
See \fBSLURM_PROFILE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_PROLOG\fR
See \fBSLURM_PROLOG\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_QOS\fR
See \fBSLURM_QOS\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_REMOTE_CWD\fR
See \fBSLURM_REMOTE_CWD\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_REQ_SWITCH\fR
See \fBSLURM_REQ_SWITCH\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_RESERVATION\fR
See \fBSLURM_RESERVATION\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_SIGNAL\fR
See \fBSLURM_SIGNAL\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_SLURMD_DEBUG\fR
See \fBSLURMD_DEBUG\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_SPREAD_JOB\fR
See \fBSLURM_SPREAD_JOB\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_TASK_EPILOG\fR
See \fBSLURM_TASK_EPILOG\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_TASK_PROLOG\fR
See \fBSLURM_TASK_PROLOG\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_THREAD_SPEC\fR
See \fBSLURM_THREAD_SPEC\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_THREADS_PER_CORE\fR
See \fBSLURM_THREADS_PER_CORE\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_THREADS\fR
See \fBSLURM_THREADS\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_TIMELIMIT\fR
See \fBSLURM_TIMELIMIT\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_TRES_BIND\fR
Same as \fB\-\-tres\-bind\fR
.IP

.TP
\fBSCRUN_TRES_PER_TASK\fR
See \fBSLURM_TRES_PER_TASK\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_UNBUFFEREDIO\fR
See \fBSLURM_UNBUFFEREDIO\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_USE_MIN_NODES\fR
See \fBSLURM_USE_MIN_NODES\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_WAIT4SWITCH\fR
See \fBSLURM_WAIT4SWITCH\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_WCKEY\fR
See \fBSLURM_WCKEY\fR from \fBsrun\fR(1).
.IP

.TP
\fBSCRUN_WORKING_DIR\fR
See \fBSLURM_WORKING_DIR\fR from \fBsrun\fR(1).
.IP

.SH "OUTPUT ENVIRONMENT VARIABLES"

.TP
\fBSCRUN_OCI_VERSION\fR
Advertised version of OCI compliance of container.
.IP

.TP
\fBSCRUN_CONTAINER_ID\fR
Value based as \fIcontainer_id\fR during create operation.
.IP

.TP
\fBSCRUN_PID\fR
PID of process used to monitor and control container on allocation node.
.IP

.TP
\fBSCRUN_BUNDLE\fR
Path to container bundle directory.
.IP

.TP
\fBSCRUN_SUBMISSION_BUNDLE\fR
Path to container bundle directory before modification by Lua script.
.IP

.TP
\fBSCRUN_ANNOTATION_*\fR
List of annotations from container's config.json.
.IP

.TP
\fBSCRUN_PID_FILE\fR
Path to pid file that is locked and populated with PID of scrun.
.IP

.TP
\fBSCRUN_SOCKET\fR
Path to control socket for scrun.
.IP

.TP
\fBSCRUN_SPOOL_DIR\fR
Path to workspace for all temporary files for current container. Purged by
deletion operation.
.IP

.TP
\fBSCRUN_SUBMISSION_CONFIG_FILE\fR
Path to container's config.json file at time of submission.
.IP

.TP
\fBSCRUN_USER\fR
Name of user that called create operation.
.IP

.TP
\fBSCRUN_USER_ID\fR
Numeric ID of user that called create operation.
.IP

.TP
\fBSCRUN_GROUP\fR
Name of user's primary group that called create operation.
.IP

.TP
\fBSCRUN_GROUP_ID\fR
Numeric ID of user primary group that called create operation.
.IP

.TP
\fBSCRUN_ROOT\fR
See \fB\-\-root\fR.
.IP

.TP
\fBSCRUN_ROOTFS_PATH\fR
Path to container's root directory.
.IP

.TP
\fBSCRUN_SUBMISSION_ROOTFS_PATH\fR
Path to container's root directory at submission time.
.IP

.TP
\fBSCRUN_LOG_FILE\fR
Path to scrun's log file during create operation.
.IP

.TP
\fBSCRUN_LOG_FORMAT\fR
Log format type during create operation.
.IP

.SH "JOB OUTPUT ENVIRONMENT VARIABLES"

.TP
\fBSLURM_*_HET_GROUP_#\fR
For a heterogeneous job allocation, the environment variables are set separately
for each component.
.IP

.TP
\fBSLURM_CLUSTER_NAME\fR
Name of the cluster on which the job is executing.
.IP

.TP
\fBSLURM_CONTAINER\fR
OCI Bundle for job.
.IP

.TP
\fBSLURM_CONTAINER_ID\fR
OCI id for job.
.IP

.TP
\fBSLURM_CPUS_PER_GPU\fR
Number of CPUs requested per allocated GPU.
.IP

.TP
\fBSLURM_CPUS_PER_TASK\fR
Number of CPUs requested per task.
.IP

.TP
\fBSLURM_DIST_PLANESIZE\fR
Plane distribution size. Only set for plane distributions.
.IP

.TP
\fBSLURM_DISTRIBUTION\fR
Distribution type for the allocated jobs.
.IP

.TP
\fBSLURM_GPU_BIND\fR
Requested binding of tasks to GPU.
.IP

.TP
\fBSLURM_GPU_FREQ\fR
Requested GPU frequency.
.IP

.TP
\fBSLURM_GPUS\fR
Number of GPUs requested.
.IP

.TP
\fBSLURM_GPUS_PER_NODE\fR
Requested GPU count per allocated node.
.IP

.TP
\fBSLURM_GPUS_PER_SOCKET\fR
Requested GPU count per allocated socket.
.IP

.TP
\fBSLURM_GPUS_PER_TASK\fR
Requested GPU count per allocated task.
.IP

.TP
\fBSLURM_HET_SIZE\fR
Set to count of components in heterogeneous job.
.IP

.TP
\fBSLURM_JOB_ACCOUNT\fR
Account name associated of the job allocation.
.IP

.TP
\fBSLURM_JOB_CPUS_PER_NODE\fR
Count of CPUs available to the job on the nodes in the allocation, using the
format \fICPU_count\fR[(x\fInumber_of_nodes\fR)][,\fICPU_count\fR
[(x\fInumber_of_nodes\fR)] ...].
For example: SLURM_JOB_CPUS_PER_NODE='72(x2),36' indicates that on the
first and second nodes (as listed by SLURM_JOB_NODELIST) the allocation
has 72 CPUs, while the third node has 36 CPUs.
\fBNOTE\fR: The \fBselect/linear\fR plugin allocates entire nodes to jobs, so
the value indicates the total count of CPUs on allocated nodes. The
\fBselect/cons_tres\fR plugin allocates individual
CPUs to jobs, so this number indicates the number of CPUs allocated to the job.
.IP

.TP
\fBSLURM_JOB_END_TIME\fR
The UNIX timestamp for a job's projected end time.
.IP

.TP
\fBSLURM_JOB_GPUS\fR
The global GPU IDs of the GPUs allocated to this job. The GPU IDs are not
relative to any device cgroup, even if devices are constrained with task/cgroup.
Only set in batch and interactive jobs.
.IP

.TP
\fBSLURM_JOB_ID\fR
The ID of the job allocation.
.IP

.TP
\fBSLURM_JOB_NODELIST\fR
List of nodes allocated to the job.
.IP

.TP
\fBSLURM_JOB_NUM_NODES\fR
Total number of nodes in the job allocation.
.IP

.TP
\fBSLURM_JOB_PARTITION\fR
Name of the partition in which the job is running.
.IP

.TP
\fBSLURM_JOB_QOS\fR
Quality Of Service (QOS) of the job allocation.
.IP

.TP
\fBSLURM_JOB_RESERVATION\fR
Advanced reservation containing the job allocation, if any.
.IP

.TP
\fBSLURM_JOB_START_TIME\fR
UNIX timestamp for a job's start time.
.IP

.TP
\fBSLURM_MEM_BIND\fR
Bind tasks to memory.
.IP

.TP
\fBSLURM_MEM_BIND_LIST\fR
Set to bit mask used for memory binding.
.IP

.TP
\fBSLURM_MEM_BIND_PREFER\fR
Set to "prefer" if the \fBSLURM_MEM_BIND\fR option includes the prefer option.
.IP

.TP
\fBSLURM_MEM_BIND_SORT\fR
Sort free cache pages (run zonesort on Intel KNL nodes)
.IP

.TP
\fBSLURM_MEM_BIND_TYPE\fR
Set to the memory binding type specified with the \fBSLURM_MEM_BIND\fR option.
Possible values are "none", "rank", "map_map", "mask_mem" and "local".
.IP

.TP
\fBSLURM_MEM_BIND_VERBOSE\fR
Set to "verbose" if the \fBSLURM_MEM_BIND\fR option includes the verbose option.
Set to "quiet" otherwise.
.IP

.TP
\fBSLURM_MEM_PER_CPU\fR
Minimum memory required per usable allocated CPU.
.IP

.TP
\fBSLURM_MEM_PER_GPU\fR
Requested memory per allocated GPU.
.IP

.TP
\fBSLURM_MEM_PER_NODE\fR
Specify the real memory required per node.
.IP

.TP
\fBSLURM_NTASKS\fR
Specify the number of tasks to run.
.IP

.TP
\fBSLURM_NTASKS_PER_CORE\fR
Request the maximum \fIntasks\fR be invoked on each core.
.IP

.TP
\fBSLURM_NTASKS_PER_GPU\fR
Request that there are \fIntasks\fR tasks invoked for every GPU.
.IP

.TP
\fBSLURM_NTASKS_PER_NODE\fR
Request that \fIntasks\fR be invoked on each node.
.IP

.TP
\fBSLURM_NTASKS_PER_SOCKET\fR
Request the maximum \fIntasks\fR be invoked on each socket.
.IP

.TP
\fBSLURM_OVERCOMMIT\fR
Overcommit resources.
.IP

.TP
\fBSLURM_PROFILE\fR
Enables detailed data collection by the acct_gather_profile plugin.
.IP

.TP
\fBSLURM_SHARDS_ON_NODE\fR
Number of GPU Shards available to the step on this node.
.IP

.TP
\fBSLURM_SUBMIT_HOST\fR
The hostname of the computer from which \fBscrun\fR was invoked.
.IP

.TP
\fBSLURM_TASKS_PER_NODE\fR
Number of tasks to be initiated on each node. Values are
comma separated and in the same order as SLURM_JOB_NODELIST.
If two or more consecutive nodes are to have the same task
count, that count is followed by "(x#)" where "#" is the
repetition count. For example, "SLURM_TASKS_PER_NODE=2(x3),1"
indicates that the first three nodes will each execute two
tasks and the fourth node will execute one task.
.IP

.TP
\fBSLURM_THREADS_PER_CORE\fR
This is only set if \fB\-\-threads\-per\-core\fR or
\fBSCRUN_THREADS_PER_CORE\fR were specified. The value will be set to the
value specified by \fB\-\-threads\-per\-core\fR or
\fBSCRUN_THREADS_PER_CORE\fR. This is used by subsequent srun calls within the
job allocation.
.IP

.TP
\fBSLURM_TRES_PER_TASK\fR
Set to the value of \fB\-\-tres\-per\-task\fR. If \fB\-\-cpus\-per\-task\fR or
\fB\-\-gpus\-per\-task\fR is specified, it is also set in
\fBSLURM_TRES_PER_TASK\fR as if it were specified in \fB\-\-tres\-per\-task\fR.
.IP

.SH "SCRUN.LUA"
.LP
/etc/slurm/\fBscrun.lua\fR must be present on any node
where \fBscrun\fR will be invoked. \fBscrun.lua\fR must be a compliant
\fBlua\fR script.

.SS "Required functions"
The following functions must be defined.

.TP
\(bu function \fBslurm_scrun_stage_in\fR(\fBid\fR, \fBbundle\fR, \fBspool_dir\fR, \fBconfig_file\fR, \fBjob_id\fR, \fBuser_id\fR, \fBgroup_id\fR, \fBjob_env\fR)
Called right after job allocation to stage container into job node(s). Must
return \fISLURM.success\fR or job will be cancelled. It is required that
function will prepare the container for execution on job node(s) as required to
run as configured in \fBoci.conf\fR(1). The function may block as long as
required until container has been fully prepared (up to the job's max wall
time).
.RS 4
.TP
\fBid\fR
Container ID
.TP
\fBbundle\fR
OCI bundle path
.TP
\fBspool_dir\fR
Temporary working directory for container
.TP
\fBconfig_file\fR
Path to config.json for container
.TP
\fBjob_id\fR
\fIjobid\fR of job allocation
.TP
\fBuser_id\fR
Resolved numeric user id of job allocation. It is generally expected that the
lua script will be executed inside of a user namespace running under the
\fIroot(0)\fR user.
.TP
\fBgroup_id\fR
Resolved numeric group id of job allocation. It is generally expected that the
lua script will be executed inside of a user namespace running under the
\fIroot(0)\fR group.
.TP
\fBjob_env\fR
Table with each entry of Key=Value or Value of each environment variable of the
job.
.IP
.RE

.TP
\(bu function \fBslurm_scrun_stage_out\fR(\fBid\fR, \fBbundle\fR, \fBorig_bundle\fR, \fBroot_path\fR, \fBorig_root_path\fR, \fBspool_dir\fR, \fBconfig_file\fR, \fBjobid\fR, \fBuser_id\fR, \fBgroup_id\fR)
Called right after container step completes to stage out files from job nodes.
Must return \fISLURM.success\fR or job will be cancelled. It is required that
function will pull back any changes and cleanup the container on job node(s).
The function may block as long as required until container has been fully
prepared (up to the job's max wall time).

.RS 4
.TP
\fBid\fR
Container ID
.TP
\fBbundle\fR
OCI bundle path
.TP
\fBorig_bundle\fR
Originally submitted OCI bundle path before modification by
\fBset_bundle_path\fR().
.TP
\fBroot_path\fR
Path to directory root of container contents.
.TP
\fBorig_root_path\fR
Original path to directory root of container contents before modification by
\fBset_root_path\fR().
.TP
\fBspool_dir\fR
Temporary working directory for container
.TP
\fBconfig_file\fR
Path to config.json for container
.TP
\fBjob_id\fR
\fIjobid\fR of job allocation
.TP
\fBuser_id\fR
Resolved numeric user id of job allocation. It is generally expected that the
lua script will be executed inside of a user namespace running under the
\fIroot(0)\fR user.
.TP
\fBgroup_id\fR
Resolved numeric group id of job allocation. It is generally expected that the
lua script will be executed inside of a user namespace running under the
\fIroot(0)\fR group.
.RE

.SS "Provided functions"
The following functions are provided for any Lua function to call as needed.

.TP
\(bu \fBslurm.set_bundle_path\fR(\fIPATH\fR)
Called to notify \fBscrun\fR to use \fIPATH\fR as new OCI container bundle
path. Depending on the filesystem layout, cloning the container bundle may be
required to allow execution on job nodes.

.TP
\(bu \fBslurm.set_root_path\fR(\fIPATH\fR)
Called to notify \fBscrun\fR to use \fIPATH\fR as new container root filesystem
path. Depending on the filesystem layout, cloning the container bundle may be
required to allow execution on job nodes. Script must also update #/root/path
in config.json when changing root path.

.TP
\(bu \fISTATUS\fR,\fIOUTPUT\fR = \fBslurm.remote_command\fR(\fISCRIPT\fR)
Run \fISCRIPT\fR in new job step on all job nodes. Returns numeric job status
as \fISTATUS\fR and job stdio as \fIOUTPUT\fR. Blocks until \fISCRIPT\fR exits.

.TP
\(bu \fISTATUS\fR,\fIOUTPUT\fR = \fBslurm.allocator_command\fR(\fISCRIPT\fR)
Run \fISCRIPT\fR as forked child process of \fBscrun\fR. Returns numeric job status
as \fISTATUS\fR and job stdio as \fIOUTPUT\fR. Blocks until \fISCRIPT\fR exits.

.TP
\(bu \fBslurm.log\fR(\fIMSG\fR, \fILEVEL\fR)
Log \fIMSG\fR at log \fILEVEL\fR. Valid range of values for \fILEVEL\fR is [0,
4].

.TP
\(bu \fBslurm.error\fR(\fIMSG\fR)
Log error \fIMSG\fR.

.TP
\(bu \fBslurm.log_error\fR(\fIMSG\fR)
Log error \fIMSG\fR.

.TP
\(bu \fBslurm.log_info\fR(\fIMSG\fR)
Log \fIMSG\fR at log level INFO.

.TP
\(bu \fBslurm.log_verbose\fR(\fIMSG\fR)
Log \fIMSG\fR at log level VERBOSE.

.TP
\(bu \fBslurm.log_verbose\fR(\fIMSG\fR)
Log \fIMSG\fR at log level VERBOSE.

.TP
\(bu \fBslurm.log_debug\fR(\fIMSG\fR)
Log \fIMSG\fR at log level DEBUG.

.TP
\(bu \fBslurm.log_debug2\fR(\fIMSG\fR)
Log \fIMSG\fR at log level DEBUG2.

.TP
\(bu \fBslurm.log_debug3\fR(\fIMSG\fR)
Log \fIMSG\fR at log level DEBUG3.

.TP
\(bu \fBslurm.log_debug4\fR(\fIMSG\fR)
Log \fIMSG\fR at log level DEBUG4.

.TP
\(bu \fIMINUTES\fR = \fBslurm.time_str2mins\fR(\fITIME_STRING\fR)
Parse \fITIME_STRING\fR into number of minutes as \fIMINUTES\fR. Valid formats:
.RS 8
.TP
\(bu days-[hours[:minutes[:seconds]]]
.TP
\(bu hours:minutes:seconds
.TP
\(bu minutes[:seconds]
.TP
\(bu -1
.TP
\(bu INFINITE
.TP
\(bu UNLIMITED
.RE

.SS Example \fBscrun.lua\fR scripts

.TP
Full Container staging example using rsync:
This full example will stage a container as given by \fBdocker\fR or
\fBpodman\fR. The container's config.json is modified to remove unwanted
functions that may cause the container run to under \fBcrun\fR or
\fBrunc\fR.
The script uses \fBrsync\fR to move the container to a shared filesystem
under the \fIscratch_path\fR variable.

\fBNOTE\fR: Support for JSON in liblua must generally be installed before Slurm
is compiled. scrun.lua's syntax and ability to load JSON support should be
tested by directly calling the script using \fBlua\fR outside of Slurm.

.nf
local json = require 'json'
local open = io.open
local scratch_path = "/run/user/"

local function read_file(path)
	local file = open(path, "rb")
	if not file then return nil end
	local content = file:read "*all"
	file:close()
	return content
end

local function write_file(path, contents)
	local file = open(path, "wb")
	if not file then return nil end
	file:write(contents)
	file:close()
	return
end

function slurm_scrun_stage_in(id, bundle, spool_dir, config_file, job_id, user_id, group_id, job_env)
	slurm.log_debug(string.format("stage_in(%s, %s, %s, %s, %d, %d, %d)",
		       id, bundle, spool_dir, config_file, job_id, user_id, group_id))

	local status, output, user, rc
	local config = json.decode(read_file(config_file))
	local src_rootfs = config["root"]["path"]
	rc, user = slurm.allocator_command(string.format("id -un %d", user_id))
	user = string.gsub(user, "%s+", "")
	local root = scratch_path..math.floor(user_id).."/slurm/scrun/"
	local dst_bundle = root.."/"..id.."/"
	local dst_config = root.."/"..id.."/config.json"
	local dst_rootfs = root.."/"..id.."/rootfs/"

	if string.sub(src_rootfs, 1, 1) ~= "/"
	then
		-- always use absolute path
		src_rootfs = string.format("%s/%s", bundle, src_rootfs)
	end

	status, output = slurm.allocator_command("mkdir -p "..dst_rootfs)
	if (status ~= 0)
	then
		slurm.log_info(string.format("mkdir(%s) failed %u: %s",
			       dst_rootfs, status, output))
		return slurm.ERROR
	end

	status, output = slurm.allocator_command(string.format("/usr/bin/env rsync --exclude sys --exclude proc --numeric-ids --delete-after --ignore-errors --stats -a -- %s/ %s/", src_rootfs, dst_rootfs))
	if (status ~= 0)
	then
		-- rsync can fail due to permissions which may not matter
		slurm.log_info(string.format("WARNING: rsync failed: %s", output))
	end

	slurm.set_bundle_path(dst_bundle)
	slurm.set_root_path(dst_rootfs)

	config["root"]["path"] = dst_rootfs

	-- Always force user namespace support in container or runc will reject
	local process_user_id = 0
	local process_group_id = 0

	if ((config["process"] ~= nil) and (config["process"]["user"] ~= nil))
	then
		-- resolve out user in the container
		if (config["process"]["user"]["uid"] ~= nil)
		then
			process_user_id=config["process"]["user"]["uid"]
		else
			process_user_id=0
		end

		-- resolve out group in the container
		if (config["process"]["user"]["gid"] ~= nil)
		then
			process_group_id=config["process"]["user"]["gid"]
		else
			process_group_id=0
		end

		-- purge additionalGids as they are not supported in rootless
		if (config["process"]["user"]["additionalGids"] ~= nil)
		then
			config["process"]["user"]["additionalGids"] = nil
		end
	end

	if (config["linux"] ~= nil)
	then
		-- force user namespace to always be defined for rootless mode
		local found = false
		if (config["linux"]["namespaces"] == nil)
		then
			config["linux"]["namespaces"] = {}
		else
			for _, namespace in ipairs(config["linux"]["namespaces"]) do
				if (namespace["type"] == "user")
				then
					found=true
					break
				end
			end
		end
		if (found == false)
		then
			table.insert(config["linux"]["namespaces"], {type= "user"})
		end

		-- Provide default user map as root if one not provided
		if (true or config["linux"]["uidMappings"] == nil)
		then
			config["linux"]["uidMappings"] =
				{{containerID=process_user_id, hostID=math.floor(user_id), size=1}}
		end

		-- Provide default group map as root if one not provided
		-- mappings fail with build???
		if (true or config["linux"]["gidMappings"] == nil)
		then
			config["linux"]["gidMappings"] =
				{{containerID=process_group_id, hostID=math.floor(group_id), size=1}}
		end

		-- disable trying to use a specific cgroup
		config["linux"]["cgroupsPath"] = nil
	end

	if (config["mounts"] ~= nil)
	then
		-- Find and remove any user/group settings in mounts
		for _, mount in ipairs(config["mounts"]) do
			local opts = {}

			if (mount["options"] ~= nil)
			then
				for _, opt in ipairs(mount["options"]) do
					if ((string.sub(opt, 1, 4) ~= "gid=") and (string.sub(opt, 1, 4) ~= "uid="))
					then
						table.insert(opts, opt)
					end
				end
			end

			if (opts ~= nil and #opts > 0)
			then
				mount["options"] = opts
			else
				mount["options"] = nil
			end
		end

		-- Remove all bind mounts by copying files into rootfs
		local mounts = {}
		for i, mount in ipairs(config["mounts"]) do
			if ((mount["type"] ~= nil) and (mount["type"] == "bind") and (string.sub(mount["source"], 1, 4) ~= "/sys") and (string.sub(mount["source"], 1, 5) ~= "/proc"))
			then
				status, output = slurm.allocator_command(string.format("/usr/bin/env rsync --numeric-ids --ignore-errors --stats -a -- %s %s", mount["source"], dst_rootfs..mount["destination"]))
				if (status ~= 0)
				then
					-- rsync can fail due to permissions which may not matter
					slurm.log_info("rsync failed")
				end
			else
				table.insert(mounts, mount)
			end
		end
		config["mounts"] = mounts
	end

	-- Force version to one compatible with older runc/crun at risk of new features silently failing
	config["ociVersion"] = "1.0.0"

	-- Merge in Job environment into container -- this is optional!
	if (config["process"]["env"] == nil)
	then
		config["process"]["env"] = {}
	end
	for _, env in ipairs(job_env) do
		table.insert(config["process"]["env"], env)
	end

	-- Remove all prestart hooks to squash any networking attempts
	if ((config["hooks"] ~= nil) and (config["hooks"]["prestart"] ~= nil))
	then
		config["hooks"]["prestart"] = nil
	end

	-- Remove all rlimits
	if ((config["process"] ~= nil) and (config["process"]["rlimits"] ~= nil))
	then
		config["process"]["rlimits"] = nil
	end

	write_file(dst_config, json.encode(config))
	slurm.log_info("created: "..dst_config)

	return slurm.SUCCESS
end

function slurm_scrun_stage_out(id, bundle, orig_bundle, root_path, orig_root_path, spool_dir, config_file, jobid, user_id, group_id)
	if (root_path == nil)
	then
		root_path = ""
	end

	slurm.log_debug(string.format("stage_out(%s, %s, %s, %s, %s, %s, %s, %d, %d, %d)",
		       id, bundle, orig_bundle, root_path, orig_root_path, spool_dir, config_file, jobid, user_id, group_id))

	if (bundle == orig_bundle)
	then
		slurm.log_info(string.format("skipping stage_out as bundle=orig_bundle=%s", bundle))
		return slurm.SUCCESS
	end

	status, output = slurm.allocator_command(string.format("/usr/bin/env rsync --numeric-ids --delete-after --ignore-errors --stats -a -- %s/ %s/", root_path, orig_root_path))
	if (status ~= 0)
	then
		-- rsync can fail due to permissions which may not matter
		slurm.log_info("rsync failed")
	else
		-- cleanup temporary after they have been synced backed to source
		slurm.allocator_command(string.format("/usr/bin/rm --preserve-root=all --one-file-system -dr -- %s", bundle))
	end

	return slurm.SUCCESS
end

slurm.log_info("initialized scrun.lua")

return slurm.SUCCESS
.fi


.SH "SIGNALS"
.TP
\fBSIGINT\fR
Attempt to gracefully cancel any related jobs (if any) and cleanup.
.IP

.TP
\fBSIGCHLD\fR
Wait for all children, cleanup anchor and gracefully shutdown.
.IP

.SH "COPYING"
Copyright (C) 2023 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\fR(1), \fBoci.conf\fR(5), \fBsrun\fR(1), \fBcrun\fR, \fBrunc\fR,
\fBDOCKER\fR and \fBpodman\fR