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kevinveenbirkenbach 64b0506947 refactor: replace raw docker usage with container wrapper across roles

Replace direct `docker` command usage, references, and documentation with
the `container` wrapper to ensure engine abstraction and future portability
(e.g. Docker → Podman).

This includes:
- Shell scripts, Ansible tasks, handlers, and Python helpers
- Documentation, comments, help texts, and meta descriptions
- Network, volume, system, and image operations
- Test expectations and comments

All runtime behavior remains unchanged while enforcing the repository-wide
rule to avoid raw Docker invocations.

https://chatgpt.com/share/698721c3-e270-800f-be7a-e4435fb54506

2026-02-07 12:57:26 +01:00

README.md

Cleanup Docker Resources

Description

This role performs a complete cleanup of Docker resources by invoking a systemd-managed script. It removes unused Docker images, stopped containers, networks, build cache, and anonymous volumes. The cleanup is fully automated and can run on a schedule or be triggered manually.

Overview

Optimized for maintaining a clean and efficient Docker environment, this role:

Loads and triggers the anonymous volume cleanup role.
Installs a systemd service and timer for Docker pruning.
Deploys a cleanup script that invokes:
- The anonymous volume cleanup service.
- container system prune -a -f to remove unused Docker resources.
Allows forced execution during maintenance runs (MODE_CLEANUP).

Purpose

The primary purpose of this role is to prevent storage bloat caused by unused Docker images, volumes, and build artifacts. Regular pruning ensures:

Reduced disk usage
Improved system performance
Faster CI/CD and container deployments
More predictable Docker engine behavior

Features

Anonymous Volume Cleanup: Integrates with sys-ctl-cln-anon-volumes to remove stale volumes.
Full Docker Prune: Executes container system prune -a -f to reclaim space.
Systemd Integration: Registers a systemd unit and timer for automated cleanup.
Scheduled Execution: Runs daily (or as configured) based on SYS_SCHEDULE_CLEANUP_DOCKER.
Force Execution Mode: When MODE_CLEANUP=true, cleanup is executed immediately.
Safe Execution: Includes validation for missing services and Docker availability.

Script Behavior

The cleanup script:

Checks whether the anonymous volume cleanup service is defined and available.
Starts the service if present.
Runs container system prune -a -f if Docker is installed.
Stops execution immediately on errors (set -e behavior).