Containers Guide

Contents

Overview

Containers are being adopted in HPC workloads. Containers rely on existing kernel features to allow greater user control over what applications see and can interact with at any given time. For HPC Workloads, these are usually restricted to the mount namespace. Slurm natively supports the requesting of unprivileged OCI Containers for jobs and steps.

Known limitations

The following is a list of known limitations of the Slurm OCI container implementation.

  • All containers must run under unprivileged (i.e. rootless) invocation. All commands are called by Slurm as the user with no special permissions.
  • Custom container networks are not supported. All containers should work with the "host" network.
  • Slurm will not transfer the OCI container bundle to the execution nodes. The bundle must already exist on the requested path on the execution node.
  • Containers are limited by the OCI runtime used. If the runtime does not support a certain feature, then that feature will not work for any job using a container.
  • oci.conf must be configured on the execution node for the job, otherwise the requested container will be ignored by Slurm (but can be used by the job or any given plugin).

Prerequisites

The host kernel must be configured to allow user land containers:

$ sudo sysctl -w kernel.unprivileged_userns_clone=1

Docker also provides a tool to verify the kernel configuration: 

$ dockerd-rootless-setuptool.sh check --force
[INFO] Requirements are satisfied

Required software:

  • Fully functional OCI runtime. It needs to be able to run outside of Slurm first.
  • Fully functional OCI bundle generation tools. Slurm requires OCI Container compliant bundles for jobs.

Example configurations for various OCI Runtimes

The OCI Runtime Specification provides requirements for all compliant runtimes but does not expressly provide requirements on how runtimes will use arguments. In order to support as many runtimes as possible, Slurm provides pattern replacement for commands issued for each OCI runtime operation. This will allow a site to edit how the OCI runtimes are called as needed to ensure compatibility.

For runc and crun, there are two sets of examples provided. The OCI runtime specification only provides the start and create operations sequence, but these runtimes provides a much more efficient run operation. Sites are strongly encouraged to use the run operation (if provided) as the start and create operations require that Slurm poll the OCI runtime to know when the containers have completed execution. While Slurm attempts to be as efficient as possible with polling, it will result in a thread using CPU time inside of the job and slower response of Slurm to catch when container execution is complete.

The examples provided have been tested to work but are only suggestions. Sites are expected to ensure that the resultant root directory used will be secure from cross user viewing and modifications. The examples provided point to "/run/user/%U" where %U will be replaced with the numeric user id which should be created and managed by systemd independently of Slurm. Be aware that the directory in this example will be cleaned up by systemd once the user logs out of the node.

oci.conf example for runc using create/start: 

EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeQuery="runc --rootless=true --root=/run/user/%U/ state %n.%u.%j.%s.%t"
RunTimeCreate="runc --rootless=true --root=/run/user/%U/ create %n.%u.%j.%s.%t -b %b"
RunTimeStart="runc --rootless=true --root=/run/user/%U/ start %n.%u.%j.%s.%t"
RunTimeKill="runc --rootless=true --root=/run/user/%U/ kill -a %n.%u.%j.%s.%t"
RunTimeDelete="runc --rootless=true --root=/run/user/%U/ delete --force %n.%u.%j.%s.%t"

oci.conf example for runc using run (suggested): 

EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeQuery="runc --rootless=true --root=/run/user/%U/ state %n.%u.%j.%s.%t"
RunTimeKill="runc --rootless=true --root=/run/user/%U/ kill -a %n.%u.%j.%s.%t"
RunTimeDelete="runc --rootless=true --root=/run/user/%U/ delete --force %n.%u.%j.%s.%t"
RunTimeRun="runc --rootless=true --root=/run/user/%U/ run %n.%u.%j.%s.%t -b %b"

oci.conf example for crun using create/start: 

EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeQuery="crun --rootless=true --root=/run/user/%U/ state %n.%u.%j.%s.%t"
RunTimeKill="crun --rootless=true --root=/run/user/%U/ kill -a %n.%u.%j.%s.%t"
RunTimeDelete="crun --rootless=true --root=/run/user/%U/ delete --force %n.%u.%j.%s.%t"
RunTimeCreate="crun --rootless=true --root=/run/user/%U/ create --bundle %b %n.%u.%j.%s.%t"
RunTimeStart="crun --rootless=true --root=/run/user/%U/ start %n.%u.%j.%s.%t"

oci.conf example for crun using run (suggested): 

EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeQuery="crun --rootless=true --root=/run/user/%U/ state %n.%u.%j.%s.%t"
RunTimeKill="crun --rootless=true --root=/run/user/%U/ kill -a %n.%u.%j.%s.%t"
RunTimeDelete="crun --rootless=true --root=/run/user/%U/ delete --force %n.%u.%j.%s.%t"
RunTimeRun="crun --rootless=true --root=/run/user/%U/ run --bundle %b %n.%u.%j.%s.%t"

oci.conf example for nvidia-container-runtime using create/start: 

EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeQuery="nvidia-container-runtime --rootless=true --root=/run/user/%U/ state %n.%u.%j.%s.%t"
RunTimeCreate="nvidia-container-runtime --rootless=true --root=/run/user/%U/ create %n.%u.%j.%s.%t -b %b"
RunTimeStart="nvidia-container-runtime --rootless=true --root=/run/user/%U/ start %n.%u.%j.%s.%t"
RunTimeKill="nvidia-container-runtime --rootless=true --root=/run/user/%U/ kill -a %n.%u.%j.%s.%t"
RunTimeDelete="nvidia-container-runtime --rootless=true --root=/run/user/%U/ delete --force %n.%u.%j.%s.%t"

oci.conf example for nvidia-container-runtime using run (suggested): 

EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeQuery="nvidia-container-runtime --rootless=true --root=/run/user/%U/ state %n.%u.%j.%s.%t"
RunTimeKill="nvidia-container-runtime --rootless=true --root=/run/user/%U/ kill -a %n.%u.%j.%s.%t"
RunTimeDelete="nvidia-container-runtime --rootless=true --root=/run/user/%U/ delete --force %n.%u.%j.%s.%t"
RunTimeRun="nvidia-container-runtime --rootless=true --root=/run/user/%U/ run %n.%u.%j.%s.%t -b %b"

oci.conf example for Singularity v4.1.3 using native runtime: 

IgnoreFileConfigJson=true
EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeRun="singularity exec --userns %r %@"
RunTimeKill="kill -s SIGTERM %p"
RunTimeDelete="kill -s SIGKILL %p"

oci.conf example for Singularity v4.0.2 in OCI mode:

Singularity v4.x requires setuid mode for OCI support. 

EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeQuery="sudo singularity oci state %n.%u.%j.%s.%t"
RunTimeRun="sudo singularity oci run --bundle %b %n.%u.%j.%s.%t"
RunTimeKill="sudo singularity oci kill %n.%u.%j.%s.%t"
RunTimeDelete="sudo singularity oci delete %n.%u.%j.%s.%t"

WARNING: Singularity (v4.0.2) requires sudo or setuid binaries for OCI support, which is a security risk since the user is able to modify these calls. This example is only provided for testing purposes.

WARNING: Upstream singularity development of the OCI interface appears to have ceased and sites should use the user namespace support instead.

oci.conf example for hpcng Singularity v3.8.0: 

EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
OCIRunTimeQuery="sudo singularity oci state %n.%u.%j.%s.%t"
OCIRunTimeCreate="sudo singularity oci create --bundle %b %n.%u.%j.%s.%t"
OCIRunTimeStart="sudo singularity oci start %n.%u.%j.%s.%t"
OCIRunTimeKill="sudo singularity oci kill %n.%u.%j.%s.%t"
OCIRunTimeDelete="sudo singularity oci delete %n.%u.%j.%s.%t

WARNING: Singularity (v3.8.0) requires sudo or setuid binaries for OCI support, which is a security risk since the user is able to modify these calls. This example is only provided for testing purposes.

WARNING: Upstream singularity development of the OCI interface appears to have ceased and sites should use the user namespace support instead.

oci.conf example for Charliecloud (v0.30) 

IgnoreFileConfigJson=true
CreateEnvFile=newline
EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeRun="env -i PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin/:/sbin/ USER=$(whoami) HOME=/home/$(whoami)/ ch-run -w --bind /etc/group:/etc/group --bind /etc/passwd:/etc/passwd --bind /etc/slurm:/etc/slurm --bind %m:/var/run/slurm/ --bind /var/run/munge/:/var/run/munge/ --set-env=%e --no-passwd %r -- %@"
RunTimeKill="kill -s SIGTERM %p"
RunTimeDelete="kill -s SIGKILL %p"

oci.conf example for Enroot (3.3.0) 

IgnoreFileConfigJson=true
CreateEnvFile=newline
EnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeEnvExclude="^(SLURM_CONF|SLURM_CONF_SERVER)="
RunTimeRun="/usr/local/bin/enroot-start-wrapper %b %m %e -- %@"
RunTimeKill="kill -s SIGINT %p"
RunTimeDelete="kill -s SIGTERM %p"

/usr/local/bin/enroot-start-wrapper: 

#!/bin/bash
BUNDLE="$1"
SPOOLDIR="$2"
ENVFILE="$3"
shift 4
IMAGE=

export USER=$(whoami)
export HOME="$BUNDLE/"
export TERM
export ENROOT_SQUASH_OPTIONS='-comp gzip -noD'
export ENROOT_ALLOW_SUPERUSER=n
export ENROOT_MOUNT_HOME=y
export ENROOT_REMAP_ROOT=y
export ENROOT_ROOTFS_WRITABLE=y
export ENROOT_LOGIN_SHELL=n
export ENROOT_TRANSFER_RETRIES=2
export ENROOT_CACHE_PATH="$SPOOLDIR/"
export ENROOT_DATA_PATH="$SPOOLDIR/"
export ENROOT_TEMP_PATH="$SPOOLDIR/"
export ENROOT_ENVIRON="$ENVFILE"

if [ ! -f "$BUNDLE" ]
then
        IMAGE="$SPOOLDIR/container.sqsh"
        enroot import -o "$IMAGE" -- "$BUNDLE" && \
        enroot create "$IMAGE"
        CONTAINER="container"
else
        CONTAINER="$BUNDLE"
fi

enroot start -- "$CONTAINER" "$@"
rc=$?

[ $IMAGE ] && unlink $IMAGE

exit $rc

Testing OCI runtime outside of Slurm

Slurm calls the OCI runtime directly in the job step. If it fails, then the job will also fail.

  • Go to the directory containing the OCI Container bundle: 
    cd $ABS_PATH_TO_BUNDLE
  • Execute OCI Container runtime (You can find a few examples on how to build a bundle below): 
    $OCIRunTime $ARGS create test --bundle $PATH_TO_BUNDLE
    $OCIRunTime $ARGS start test
    $OCIRunTime $ARGS kill test
    $OCIRunTime $ARGS delete test
    If these commands succeed, then the OCI runtime is correctly configured and can be tested in Slurm.

Requesting container jobs or steps

salloc, srun and sbatch (in Slurm 21.08+) have the '--container' argument, which can be used to request container runtime execution. The requested job container will not be inherited by the steps called, excluding the batch and interactive steps.

  • Batch step inside of container: 
    sbatch --container $ABS_PATH_TO_BUNDLE --wrap 'bash -c "cat /etc/*rel*"'
  • Batch job with step 0 inside of container: 
    sbatch --wrap 'srun bash -c "--container $ABS_PATH_TO_BUNDLE cat /etc/*rel*"'
  • Interactive step inside of container: 
    salloc --container $ABS_PATH_TO_BUNDLE bash -c "cat /etc/*rel*"
  • Interactive job step 0 inside of container: 
    salloc srun --container $ABS_PATH_TO_BUNDLE bash -c "cat /etc/*rel*"
  • Job with step 0 inside of container: 
    srun --container $ABS_PATH_TO_BUNDLE bash -c "cat /etc/*rel*"
  • Job with step 1 inside of container: 
    srun srun --container $ABS_PATH_TO_BUNDLE bash -c "cat /etc/*rel*"

Integration with Rootless Docker (Docker Engine v20.10+ & Slurm-23.02+)

Slurm's scrun can be directly integrated with Rootless Docker to run containers as jobs. No special user permissions are required and should not be granted to use this functionality.

Prerequisites

  1. slurm.conf must be configured to use Munge authentication.
    AuthType=auth/munge
  2. scrun.lua must be configured for site storage configuration.
  3. Configure kernel to allow pings
  4. Configure rootless dockerd to allow listening on privileged ports
  5. scrun.lua must be present on any node where scrun may be run. The example should be sufficent for most environments but paths should be modified to match available local storage.
  6. oci.conf must be present on any node where any container job may be run. Example configurations for known OCI runtimes are provided above. Examples may require paths to be correct to installation locations.

Limitations

  1. JWT authentication is not supported.
  2. Docker container building is not currently functional pending merge of Docker pull request.
  3. Docker does not expose configuration options to disable security options needed to run jobs. This requires that all calls to docker provide the following command line arguments. This can be done via shell variable, an alias, wrapper function, or wrapper script: 
    --security-opt label:disable --security-opt seccomp=unconfined --security-opt apparmor=unconfined --net=none
    Docker's builtin security functionality is not required (or wanted) for containers being run by Slurm. Docker is only acting as a container image lifecycle manager. The containers will be executed remotely via Slurm following the existing security configuration in Slurm outside of unprivileged user control.
  4. All containers must use the "none" networking driver . Attempting to use bridge, overlay, host, ipvlan, or macvlan can result in scrun being isolated from the network and not being able to communicate with the Slurm controller. The container is run by Slurm on the compute nodes which makes having Docker setup a network isolation layer ineffective for the container.
  5. docker exec
    command is not supported.
  6. docker compose
    command is not supported.
  7. docker pause
    command is not supported.
  8. docker unpause
    command is not supported.
  9. docker swarm
    command is not supported.

Setup procedure

  1. Install and configure Rootless Docker
    Rootless Docker must be fully operational and able to run containers before continuing.
  2. Setup environment for all docker calls: 
    export DOCKER_HOST=unix://$XDG_RUNTIME_DIR/docker.sock
    All commands following this will expect this environment variable to be set.
  3. Stop rootless docker: 
    systemctl --user stop docker
  4. Configure Docker to call scrun instead of the default OCI runtime.
    • To configure for all users: 
      /etc/docker/daemon.json
    • To configure per user: 
      ~/.config/docker/daemon.json
    Set the following fields to configure Docker: 
    {
    "experimental": true,
    "iptables": false,
    "bridge": "none",
    "no-new-privileges": true,
    "rootless": true,
    "selinux-enabled": false,
    "default-runtime": "slurm",
    "runtimes": {
        "slurm": {
            "path": "/usr/local/bin/scrun"
        }
    },
    "data-root": "/run/user/${USER_ID}/docker/",
    "exec-root": "/run/user/${USER_ID}/docker-exec/"
}
    Correct path to scrun as if installation prefix was configured. Replace ${USER_ID} with numeric user id or target a different directory with global write permissions and sticky bit. Rootless docker requires a different root directory than the system's default to avoid permission errors.
  5. It is strongly suggested that sites consider using inter-node shared filesystems to store Docker's containers. While it is possible to have a scrun.lua script to push and pull images for each deployment, there can be a massive performance penalty. Using a shared filesystem will avoid moving these files around.
    Possible configuration additions to daemon.json to use a shared filesystem with vfs storage driver: 
    {
  "storage-driver": "vfs",
  "data-root": "/path/to/shared/filesystem/user_name/data/",
  "exec-root": "/path/to/shared/filesystem/user_name/exec/",
}
    Any node expected to be able to run containers from Docker must have ability to atleast read the filesystem used. Full write privileges are suggested and will be required if changes to the container filesystem are desired.
  6. Configure dockerd to not setup network namespace, which will break scrun's ability to talk to the Slurm controller.
    • To configure for all users: 
      /etc/systemd/user/docker.service.d/override.conf
    • To configure per user: 
      ~/.config/systemd/user/docker.service.d/override.conf
    [Service]
Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=none"
Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_NET=host"
  7. Reload docker's service unit in systemd: 
    systemctl --user daemon-reload
  8. Start rootless docker: 
    systemctl --user start docker
  9. Verify Docker is using scrun: 
    export DOCKER_SECURITY="--security-opt label=disable --security-opt seccomp=unconfined  --security-opt apparmor=unconfined --net=none"
docker run $DOCKER_SECURITY hello-world
docker run $DOCKER_SECURITY alpine /bin/printenv SLURM_JOB_ID
docker run $DOCKER_SECURITY alpine /bin/hostname
docker run $DOCKER_SECURITY -e SCRUN_JOB_NUM_NODES=10 alpine /bin/hostname

Integration with Podman (Slurm-23.02+)

Slurm's scrun can be directly integrated with Podman to run containers as jobs. No special user permissions are required and should not be granted to use this functionality.

Prerequisites

  1. Slurm must be fully configured and running on host running dockerd.
  2. slurm.conf must be configured to use Munge authentication.
    AuthType=auth/munge
  3. scrun.lua must be configured for site storage configuration.
  4. scrun.lua must be present on any node where scrun may be run. The example should be sufficent for most environments but paths should be modified to match available local storage.
  5. oci.conf must be present on any node where any container job may be run. Example configurations for known OCI runtimes are provided above. Examples may require paths to be correct to installation locations.

Limitations

  1. JWT authentication is not supported.
  2. All containers must use host networking
  3. podman exec
    command is not supported.
  4. podman kube
    command is not supported.
  5. podman pod
    command is not supported.

Setup procedure

  1. Install and configure Podman
    Podman must be fully operational and able to run containers before continuing.
  2. Configure Podman to call scrun instead of the default OCI runtime.
    • To configure for all users: 
      /etc/containers/containers.conf
    • To configure per user: 
      ~/.config/containers/containers.conf
    Set the following configuration parameters to configure Podman: 
    [containers]
apparmor_profile = "unconfined"
cgroupns = "host"
cgroups = "enabled"
default_sysctls = []
label = false
netns = "host"
no_hosts = true
pidns = "host"
utsns = "host"
userns = "host"

[engine]
cgroup_manager = "systemd"
runtime = "slurm"
runtime_supports_nocgroups = [ "slurm" ]
runtime_supports_json = [ "slurm" ]
remote = false

[engine.runtimes]
slurm = [ "/usr/local/bin/scrun" ]
    Correct path to scrun as if installation prefix was configured.
  3. The "cgroup_manager" field will need to be swapped to "cgroupfs" on systems not running systemd.
  4. It is strongly suggested that sites consider using inter-node shared filesystems to store Podman's containers. While it is possible to have a scrun.lua script to push and pull images for each deployment, there can be a massive performance penalty. Using a shared filesystem will avoid moving these files around.
    • To configure for all users: 
      /etc/containers/storage.conf
    • To configure per user: 
      ~/.config/containers/storage.conf
    Possible configuration additions to storage.conf to use a shared filesystem with vfs storage driver: 
    [storage]
driver = "vfs"
runroot = "$HOME/containers"
graphroot = "$HOME/containers"

[storage.options]
pull_options = {use_hard_links = "true", enable_partial_images = "true"}


[storage.options.vfs]
ignore_chown_errors = "true"
    Any node expected to be able to run containers from Podman must have ability to atleast read the filesystem used. Full write privileges are suggested and will be required if changes to the container filesystem are desired.
  5. Verify Podman is using scrun: 
    podman run hello-world
podman run alpine printenv SLURM_JOB_ID
podman run alpine hostname
podman run alpine -e SCRUN_JOB_NUM_NODES=10 hostname
salloc podman run --env-host=true alpine hostname
salloc sh -c 'podman run -e SLURM_JOB_ID=$SLURM_JOB_ID alpine hostname'
  6. Optional: Create alias for Docker: 
    alias docker=podman
    or 
    alias docker='podman --config=/some/path "$@"'

Troubleshooting

  • Podman runs out of locks: 
    $ podman run alpine uptime
Error: allocating lock for new container: allocation failed; exceeded num_locks (2048)
    1. Try renumbering:
      podman system renumber
    2. Try reseting all storage:
      podman system reset

OCI Container bundle

There are multiple ways to generate an OCI Container bundle. The instructions below are the method we found the easiest. The OCI standard provides the requirements for any given bundle: Filesystem Bundle

Here are instructions on how to generate a container using a few alternative container solutions:

  • Create an image and prepare it for use with runc:
    1. Use an existing tool to create a filesystem image in /image/rootfs:
      • debootstrap: 
        sudo debootstrap stable /image/rootfs http://deb.debian.org/debian/
      • yum: 
        sudo yum --config /etc/yum.conf --installroot=/image/rootfs/ --nogpgcheck --releasever=${CENTOS_RELEASE} -y
      • docker: 
        mkdir -p ~/oci_images/alpine/rootfs
cd ~/oci_images/
docker pull alpine
docker create --name alpine alpine
docker export alpine | tar -C ~/oci_images/alpine/rootfs -xf -
docker rm alpine
    2. Configure a bundle for runtime to execute:
      • Use runc to generate a config.json: 
        cd ~/oci_images/alpine
runc --rootless=true spec --rootless
      • Test running image:
        • srun --container ~/oci_images/alpine/ uptime
  • Use umoci and skopeo to generate a full image: 
    mkdir -p ~/oci_images/
cd ~/oci_images/
skopeo copy docker://alpine:latest oci:alpine:latest
umoci unpack --rootless --image alpine ~/oci_images/alpine
srun --container ~/oci_images/alpine uptime
  • Use singularity to generate a full image: 
    mkdir -p ~/oci_images/alpine/
cd ~/oci_images/alpine/
singularity pull alpine
sudo singularity oci mount ~/oci_images/alpine/alpine_latest.sif ~/oci_images/alpine
mv config.json singularity_config.json
runc spec --rootless
srun --container ~/oci_images/alpine/ uptime

Example OpenMPI v5 + PMIx v4 container

Minimalist Dockerfile to generate a image with OpenMPI and PMIx to test basic MPI jobs.

Dockerfile

FROM almalinux:latest
RUN dnf -y update && dnf -y upgrade && dnf install -y yum-utils && dnf config-manager --set-enabled powertools
RUN dnf -y install make automake gcc gcc-c++ kernel-devel bzip2 python3 wget libevent-devel hwloc-devel munge-devel

WORKDIR /usr/local/src/
RUN wget 'https://github.com/openpmix/openpmix/releases/download/v4.2.2/pmix-4.2.2.tar.bz2' -O - | tar -xvjf -
WORKDIR /usr/local/src/pmix-4.2.2/
RUN ./configure && make -j && make install

WORKDIR /usr/local/src/
RUN wget --inet4-only 'https://download.open-mpi.org/release/open-mpi/v5.0/openmpi-5.0.0rc9.tar.gz' -O - | tar -xvzf -
WORKDIR /usr/local/src/openmpi-5.0.0rc9
RUN ./configure --disable-pty-support --enable-ipv6 --without-slurm --with-pmix --enable-debug && make -j && make install

WORKDIR /usr/local/src/openmpi-5.0.0rc9/examples
RUN make && cp -v hello_c ring_c connectivity_c spc_example /usr/local/bin

Container support via Plugin

Slurm allows container developers to create SPANK Plugins that can be called at various points of job execution to support containers. Any site using one of these plugins to start containers should not have an "oci.conf" configuration file. The "oci.conf" file activates the builtin container functionality which may conflict with the SPANK based plugin functionality.

The following projects are third party container solutions that have been designed to work with Slurm, but they have not been tested or validated by SchedMD.

Shifter

Shifter is a container project out of NERSC to provide HPC containers with full scheduler integration.

ENROOT and Pyxis

Enroot is a user namespace container system sponsored by NVIDIA that supports:

  • Slurm integration via pyxis
  • Native support for Nvidia GPUs
  • Faster Docker image imports

Sarus

Sarus is a privileged container system sponsored by ETH Zurich CSCS that supports:

Overview slides of Sarus are here.

Last modified 21 May 2024