Individual skill

dockerfile-optimizer

Audits Dockerfiles for multi-stage build efficiency, layer caching, non-root security, and minimal base image footprint.

skills/utilities/dockerfile-optimizer/SKILL.md

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Repository stars (not skill ratings): 27
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License: MIT

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## Purpose

Analyze and optimize container Dockerfiles for minimal image size (Alpine / Distroless), lightning-fast layer caching, non-root security hardening, and clean signal handling.

## When to Use

- Container image builds take minutes instead of seconds in CI.
- Production images are bloated (e.g. 1.5GB for a simple Node or Go binary).
- Security vulnerability scans flag build toolchains (gcc, git, npm) present in production runtime images.

## What to Analyze

1. **Multi-Stage Builds**: Separate build-time dependencies (compilers, devDependencies) from lean runtime artifacts.
2. **Layer Caching Optimization**: Copy lockfiles and install dependencies *before* copying entire application source code.