What is the minimal Debian apptainer `.def` to install an APT package?
May 20, 9:46am

Here’s a minimal Apptainer (formerly Singularity) .def file to install an APT package in a Debian-based container:

def
Bootstrap: docker
From: debian:latest

%post
    apt-get update && apt-get install -y <package-name>

Explanation:

  • Bootstrap: docker: Uses Docker as the bootstrap method.
  • From: debian:latest: Pulls the latest Debian image.
  • %post: Runs commands after the base image is built.
    • apt-get update: Updates the package list.
    • apt-get install -y <package-name>: Installs the specified package (replace <package-name> with your package, e.g., cowsay).

Example:

To install cowsay:

def
Bootstrap: docker
From: debian:latest

%post
    apt-get update && apt-get install -y cowsay

Build the container with:

bash
apptainer build my_container.sif my_container.def
May 20, 9:46am

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