Dockerfile Generator
Generate a Dockerfile from a base image, working directory, copy and run steps, exposed port and start command.
Last reviewed by the Radiatus Cloud team
Generate a Dockerfile with base image, steps, port and start command.
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Generate a Dockerfile
A Dockerfile is the recipe for building a container image, listing the steps to assemble your application and its dependencies. This generator produces a clean, conventional Dockerfile from a base image, working directory, a build command, an exposed port and a start command. It follows a sensible layer order, copying dependency manifests and installing packages before copying the rest of the source, which lets Docker cache the dependency layer and speed up rebuilds.
The start command is written in the exec form as a JSON array, the recommended style for correct signal handling.
Build efficient images
The order of instructions in a Dockerfile affects both build speed and image size, because Docker caches each layer and reuses it when nothing above has changed. Installing dependencies before copying the full source means code changes do not needlessly reinstall packages. Choosing a slim base image, such as an alpine variant, keeps the final image small and reduces the attack surface.
This is a starting template; add multi-stage builds, a non-root user and health checks for production images. Review the output and adapt it to your stack. All generation happens locally in your browser.
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Frequently Asked Questions
Why copy dependency files before the source?
It lets Docker cache the dependency-install layer, so changing your source code does not trigger a slow reinstall of all packages.
What is the exec form of CMD?
It is the JSON-array form, such as CMD with a list of strings, which handles process signals correctly compared to the shell form.
Why use an alpine base image?
Alpine variants are very small, producing lean images with a smaller attack surface, though they occasionally need extra packages for compatibility.
What should I add for production?
Consider multi-stage builds to shrink the image, running as a non-root user, and adding a health check instruction for reliability.
Privacy & Security
Everything runs in your browser; nothing is uploaded.
How to Use
Fill in the build steps and generate the Dockerfile.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.