dockerfile-hardener

name	dockerfile-hardener
description	Improve Dockerfiles for image size, caching, security, reproducibility, and multi-stage build hygiene. Use when container builds are slow, bloated, or unsafe.

Dockerfile Hardener

Overview

Improve Dockerfiles for image size, caching, security, reproducibility, and multi-stage build hygiene.

Core Workflow

1. Inspect the relevant diffs, configs, source files, or artifacts before forming a conclusion.
2. Compare the current state against repo conventions, expected guarantees, and known risk areas.
3. Prioritize the highest-impact gaps, regressions, or improvement opportunities instead of surface-level noise.
4. Recommend the smallest high-leverage changes and the checks that would validate them.

Deliver

• Ranked findings or improvement opportunities with clear evidence.
• The main risks, tradeoffs, or regressions that matter most.
• Validation steps or follow-up edits that would reduce risk.

Guardrails

• Lead with findings, not generic praise or low-value commentary.
• Use repo evidence and surrounding context instead of reviewing in isolation.
• Flag missing validation when a recommendation depends on behavior you could not confirm.
• Prefer repository evidence, command output, and nearby tests over vague intuition.