🐳 Dockerfile Generator
Generate a Dockerfile from form inputs — base image, ports, env vars, commands, and best-practice options.
# Generated Dockerfile will appear here…
About this tool
The Dockerfile Generator helps you scaffold a production-ready Dockerfile without memorizing every instruction syntax. Pick a base image (Node.js, Python, Go, Nginx, Alpine, Ubuntu, OpenJDK, Rust, PHP, Deno, or custom), set your ports, environment variables, and commands — the generator produces a complete file you can docker build immediately.
Example: select Node.js, keep the default port 3000, set run command npm ci --omit=dev then npm run build, and set CMD to ["node", "dist/index.js"] — you get a ready-to-use Dockerfile for a modern Node.js application.
Multi-stage builds produce a two-stage Dockerfile (builder + slim Alpine runtime) for smaller final images. The non-root user option adds security best practices. All options work together: labels, HEALTHCHECK, EXPOSE — just check the boxes.
FAQ
Do I need Docker installed to use this generator? ›
No. The generator runs entirely in your browser. It produces a Dockerfile you can save and use later with docker build on any machine that has Docker.
What does multi-stage mean? ›
Multi-stage builds use a first stage (e.g., the full Node.js image) to compile or install dependencies, then copy only the result into a second, smaller stage (Alpine Linux). This dramatically reduces the final image size — often from 1+ GB to under 200 MB.
Is the generated Dockerfile ready to use as-is? ›
Almost always yes — but review the commands and paths for your specific project. The generator follows Docker best practices: WORKDIR, COPY instead of ADD for local files, explicit EXPOSE, and optional non-root user.
Can I use a custom image not in the list? ›
Yes. Type any image name and tag into the custom input field, e.g. python:3.12-slim or ghcr.io/org/my-image:latest. The selected base buttons are ignored when custom text is entered.