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MileniumTick
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multi-stage-dockerfile

Generate multi-stage Dockerfiles with builder-runtime separation and layer optimization.

Updated Mar 25, 2026
Search Tags:#security#containerization#docker#dockerfile#best-practices#image-optimization#multistage-build
One-click install
npx skills add https://github.com/MileniumTick/skills --skill multi-stage-dockerfile-mileniumtick
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: multi-stage-dockerfile
Source: https://github.com/MileniumTick/skills/tree/main/skills/multi-stage-dockerfile
Command: npx skills add https://github.com/MileniumTick/skills --skill multi-stage-dockerfile-mileniumtick

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Building container images can be wasteful and error-prone when not optimized. This Skill generates and enforces multi-stage Dockerfiles that dramatically reduce final image sizes, improve security, and streamline CI/CD.

Core Features & Use Cases

  • Builder-runtime separation: create separate builder and runtime stages to isolate build tools and dependencies.
  • Layer and base image optimization: instructs on selecting minimal base images, exact tags, and caching-friendly commands.
  • Security best practices: promotes non-root users, removal of build tools, and reduced surface area.
  • Use cases include microservices, serverless runtimes, and monorepos where language stacks vary.

Quick Start

Create a multi-stage Dockerfile for a Node.js app with a builder and a minimal runtime stage.

Frequently Asked Questions about multi-stage-dockerfile

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I reduce Docker image size using a multi-stage Dockerfile?▼

Reduce Docker image size by creating a multi-stage Dockerfile that isolates build tools and dependencies in a builder stage, then copies only runtime artifacts to a minimal final image.

What is builder-runtime separation in Docker builds?▼

Builder-runtime separation is a Docker build strategy that uses distinct stages to isolate compilation and dependency installation from the final runtime, reducing the final image's surface area.

How do I create a secure multi-stage Dockerfile for a Node.js app?▼

Create a secure multi-stage Dockerfile for a Node.js app by defining a builder stage for dependencies and a minimal runtime stage that enforces secure defaults like non-root users and explicit base image tags.

Does multi-stage Dockerfile work for microservices and monorepos?▼

Yes, multi-stage Dockerfiles work for microservices and monorepos by generating efficient, language-agnostic builds that apply layer optimization and builder-runtime separation across varying stacks.

Why does my Docker image include unnecessary build tools?▼

Your Docker image includes unnecessary build tools because it lacks builder-runtime separation; moving compilation to a multi-stage Dockerfile removes build dependencies from the final runtime image.

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