Apptainer Builder

Build Apptainer/Singularity container images (.sif files) as SLURM batch jobs. You can build from a Docker image or from a definition file.

Job Scheduler Options

Only basic fields are shown (no advanced section):

• Partition — select the partition for the build job.
• Job Name — assign a name for the build job.
• Working Directory — where the .sif output file is saved.

Build Modes

Build from Docker Image

• SIF File Name — name for the output .sif file (required)
• Docker Image Path — Docker image reference using docker:// prefix (e.g., docker://ubuntu:22.04)

Build from Definition File

• SIF File Name — name for the output .sif file (required)
• Definition File Path — path to an Apptainer .def file on the cluster. Use the Select button to browse, or click Create New to write a new definition file in a dialog.

Advanced Apptainer Build Options

Option	Description
Build Arguments	Key-value pairs replacing {{ variable }} in definition files
Build Arg File	Path to a file containing build arguments
Fakeroot	Build appearing as root user
Force	Overwrite existing image
Sandbox	Build as a writable chroot directory
Encrypt	Build with encrypted filesystem
NVIDIA Support (--nv)	Inject host NVIDIA libraries
NVIDIA Container CLI (--nvccli)	Use NVIDIA Container CLI
ROCm Support	Inject AMD ROCm libraries
Writable Tmpfs	Use writable tmpfs overlay
Disable Cache	Build without using cache
Library URL	Custom library URL for pulling images
Bind Paths	Paths to bind-mount during build
Sections	Specific sections to build from definition file

Build duration varies based on container complexity. Monitor progress on the Job Logs page.