Containers

Enables Docker-based container runtime defaults.

Purpose

Provide a Docker-backed container runtime for workloads that still rely on Docker-specific features, with automatic image pruning and persistent state.

Entry Point

• Main file: containers.nix

Options

core.containers.enable

Whether to enable container support.

Architecture / Services / Scope

When enabled, the module:

• enables virtualisation.docker with the default Docker package,
• enables CDI device support in the Docker daemon,
• enables weekly automatic image pruning,
• sets virtualisation.oci-containers.backend = "docker",
• adds docker to core.defaultGroups, and
• persists Docker state directories under /var/lib/docker (overlay storage, images, volumes, containers, containerd, and buildkit data).

Operational Notes / Assumptions

• Docker is intentionally preferred because current workloads still need features not covered by Podman or podman-compose.
• Users receive Docker access through the shared core.defaultGroups handling.