Docker Architecture Patterns

Version: 1.1.0 | Updated: 2026-07-16

Purpose

Define the production components, control paths, state boundaries, and failure containment for Dockerfile, BuildKit build, OCI image, Compose service, or container release.

Why

Images are minimal, immutable, reproducible, non-root, secret-free, multi-architecture aware, and terminate correctly. The diagram models actual Docker platform elements so reviewers can identify ownership and unsafe coupling.

How

Required boundaries

1. Dependency and compile stages consume pinned inputs; runtime receives only required artifacts.
2. Secrets use BuildKit mounts and never become layer contents.
3. The runtime stage declares non-root identity, stop signal, health behavior, and explicit writable paths.
4. Registry promotion is by digest with provenance and SBOM attached.
5. Persistent state lives outside the container filesystem.

Operational evidence

• Dockerfile, .dockerignore, build context list, syntax directive, and BuildKit provenance
• base and final image digests, platform manifest, layer history, SBOM, and vulnerability report
• runtime user, capabilities, seccomp, mounts, ports, environment, healthcheck, and stop signal
• Compose rendered config, network/DNS state, container inspect, events, and resource stats

Rollback path

Redeploy the previous OCI digest, not a reused tag; preserve volumes and inspect migration compatibility before starting the older image.

Version-aware caution

Capture Docker Engine, Buildx/BuildKit, Dockerfile syntax directive, Compose specification, target platforms, and base-image digest. Builder features and Compose keys vary; tags alone do not identify the tested filesystem.

Tradeoffs

The architecture introduces explicit Docker boundaries and operational artifacts that require ownership. In return, failures in architecture or entrypoint exec-format mismatch, runtime file permission or read-only filesystem failure, image/build-cache/log disk exhaustion, OOM kill or CPU throttling, Compose DNS, network, dependency, or health failure become observable and containable.

Anti-patterns

• Installing build tools, package caches, and credentials in the final stage expands attack surface and makes the image irreproducible.
• Do not remove a native warning, validator, policy, or safety limit merely to make generated output pass.
• Do not claim a successful result without preserving the command, target, artifact/revision, and observed output.

Enterprise considerations

Container governance approves base-image families, enforces digest promotion and signed provenance, applies vulnerability SLAs, and retains SBOMs for every deployed digest.

Official sources

• Dockerfile reference
• Build best practices
• Build secrets
• Docker security

Checklist

• Dependency and compile stages consume pinned inputs; runtime receives only required artifacts.
• Secrets use BuildKit mounts and never become layer contents.
• The runtime stage declares non-root identity, stop signal, health behavior, and explicit writable paths.
• Registry promotion is by digest with provenance and SBOM attached.
• Persistent state lives outside the container filesystem.
• Diagram matches deployed topology rather than an aspirational target.
• Rollback path preserves state and mixed-version contracts.

Changelog

• 1.1.0 (2026-07-16): Replaced generic adapter diagram with native Docker architecture.
• 1.0.0 (2026-07-16): Added initial pattern.