singularity build

Build a Singularity image



When Singularity builds the container, output can be one of a few formats:

default: The compressed Singularity read only image format (default) sandbox: This is a read-write container within a directory structure

note: It is a common workflow to use the “sandbox” mode for development of the container, and then build it as a default Singularity image for production use. The default format is immutable.


The build spec target is a definition (def) file, local image, or URI that can be used to create a Singularity container. Several different local target formats exist:

def file : This is a recipe for building a container (examples below) directory: A directory structure containing a (ch)root file system image: A local image on your machine (will convert to sif if

it is legacy format)

Targets can also be remote and defined by a URI of the following formats:

library:// an image library (default docker:// a Docker/OCI registry (default Docker Hub) shub:// a Singularity registry (default Singularity Hub) oras:// an OCI registry that holds SIF files using ORAS

singularity build [local options...] <IMAGE PATH> <BUILD SPEC>



        Bootstrap: library
        From: debian:9

        Bootstrap: docker
        From: tensorflow/tensorflow:latest
        IncludeCmd: yes # Use the CMD as runscript instead of ENTRYPOINT

    Singularity Hub:
        Bootstrap: shub
        From: singularityhub/centos

        Bootstrap: yum
        OSVersion: 7
        Include: yum

        Bootstrap: debootstrap
        OSVersion: trusty

    Local Image:
        Bootstrap: localimage
        From: /home/dave/starter.img

        Bootstrap: scratch # Populate the container with a minimal rootfs in %setup


The following sections are presented in the order of processing, with the exception
that labels and environment can also be manipulated in %post.

        echo "This is a scriptlet that will be executed on the host, as root before"
        echo "the container has been bootstrapped. This section is not commonly used."

        echo "This is a scriptlet that will be executed on the host, as root, after"
        echo "the container has been bootstrapped. To install things into the container"
        echo "reference the file system location with $SINGULARITY_ROOTFS."

        /path/on/host/file.txt /path/on/container/file.txt
        relative_file.txt /path/on/container/relative_file.txt

        echo "This scriptlet section will be executed from within the container after"
        echo "the bootstrap/base has been created and setup."

        export HAN VADER LUKE

        echo "Define any test commands that should be executed after container has been"
        echo "built. This scriptlet will be executed from within the running container"
        echo "as the root user. Pay attention to the exit/return value of this scriptlet"
        echo "as any non-zero exit code will be assumed as failure."
        exit 0

        echo "Define actions for the container to be executed with the run command or"
        echo "when container is executed."

        echo "Define actions for container to perform when started as an instance."

        HELLO MOTO
        KEY VALUE

        This is a text file to be displayed with the run-help command.


    Build a sif file from a Singularity recipe file:
        $ singularity build /tmp/debian0.sif /path/to/debian.def

    Build a sif image from the Library:
        $ singularity build /tmp/debian1.sif library://debian:latest

    Build a base sandbox from DockerHub, make changes to it, then build sif
        $ singularity build --sandbox /tmp/debian docker://debian:latest
        $ singularity exec --writable /tmp/debian apt-get install python
        $ singularity build /tmp/debian2.sif /tmp/debian


    --arch string          architecture for remote build (default "amd64")
-B, --bind strings         a user-bind path specification. spec has the format src[:dest[:opts]],where src and dest are outside and inside paths. If dest is not given,it is set equal to src. Mount options ('opts') may be specified as 'ro'(read-only) or 'rw' (read/write, which is the default).Multiple bind paths can be given by a comma separated list. (not supported with remote build)
    --builder string       remote Build Service URL, setting this implies --remote
-d, --detached             submit build job and print build ID (no real-time logs and requires --remote)
    --disable-cache        do not use cache or create cache
    --docker-host string   specify a custom Docker daemon host
    --docker-login         login to a Docker Repository interactively
-e, --encrypt              build an image with an encrypted file system
-f, --fakeroot             build using user namespace to fake root user (requires a privileged installation)
    --fix-perms            ensure owner has rwX permissions on all container content for oci/docker sources
-F, --force                overwrite an image file if it exists
-h, --help                 help for build
    --json                 interpret build definition as JSON
    --library string       container Library URL
    --mount stringArray    a mount specification e.g. 'type=bind,source=/opt,destination=/hostopt'.
    --no-cleanup           do NOT clean up bundle after failed build, can be helpful for debugging
    --no-https             use http instead of https for docker:// oras:// and library://<hostname>/... URIs
-T, --notest               build without running tests in %test section
    --nv                   inject host Nvidia libraries during build for post and test sections (not supported with remote build)
    --nvccli               use nvidia-container-cli for GPU setup (experimental)
    --passphrase           prompt for an encryption passphrase
    --pem-path string      enter an path to a PEM formatted RSA key for an encrypted container
-r, --remote               build image remotely (does not require root)
    --rocm                 inject host Rocm libraries during build for post and test sections (not supported with remote build)
-s, --sandbox              build image as sandbox format (chroot directory structure)
    --section strings      only run specific section(s) of deffile (setup, post, files, environment, test, labels, none) (default [all])
-u, --update               run definition over existing container (skips header)
    --writable-tmpfs       during the %test section, makes the file system accessible as read-write with non persistent data (with overlay support only)


Linux container platform optimized for High Performance Computing (HPC) and Enterprise Performance Computing (EPC)

Auto generated by spf13/cobra on 25-Aug-2023