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dockersingularity-container

how to build singularity container from dockerfile

I want to build singularity container from dockerfile.

I have pulled and run docker images from docker hub with singularity.

singularity pull docker://ubuntu:latest

I have also build the image from singularity recipe file. 

singularity build  cpp.sif singularity_file

But I want to build singularity image from dockerfile.

Anyone know how to do it. Is it possible ???

Solution

  • You cannot build a singularity container directly from a Dockerfile, but you can do it in a two-step process.

    docker build -t local/my_container:latest .
sudo singularity build my_container.sif docker-daemon://local/my_container:latest

    Using docker://my_container looks for the container on Docker Hub. When you use docker-daemon, it looks at your locally built docker containers. You can also use Bootstrap: docker-daemon in a Singularity definition file.

    EDIT: Both singularity and apptainer now require an explicit tag name for the source docker container. Answer updated accordingly.