Dockerfile Generator
Generate a production-ready single-stage Dockerfile from structured inputs — pick a base stack (Node, Python, Go, Java, Ruby, PHP, Rust, .NET, Nginx, or a custom image), then set WORKDIR, build ARGs, ENV vars, system packages, dependency install, build command, exposed ports, a non-root user, a HEALTHCHECK, and ENTRYPOINT/CMD in exec or shell form. Runs entirely in your browser.
Input
The tag appended after the image name (image:TAG).
Build-time variables. Each line becomes an ARG instruction.
Runtime variables. Each line becomes an ENV instruction.
Installed via apk/apt-get based on the base image. Leave empty to skip.
Copied first for better Docker layer caching.
Runs after dependency files are copied.
Optional. Runs after the full source is copied.
Comma-separated TCP ports.
Optional. Sets the USER for runtime.
Optional. Shell command run inside the container.
Exec form is a JSON array and does not run in a shell; shell form is used verbatim.
Optional. Use when CMD only supplies arguments.
Default process when the container starts.
Output
Guides
The Dockerfile Generator builds a clean, production-ready Dockerfile from a handful of structured fields instead of memorizing instruction order and best practices. Pick a base stack, fill in how your app installs and starts, and copy the result — no Docker daemon, no upload, nothing leaves your browser.
What it does
You choose a base stack (Node.js, Python, Go, Java, Ruby, PHP, Rust, .NET, Nginx, Alpine, Ubuntu, Debian, or a fully custom image reference) and the tool assembles a single-stage Dockerfile in the conventional, cache-friendly order:
FROMwith your image and tagARGbuild-time variablesWORKDIRENVruntime variables (values with spaces are quoted automatically)- A system-package
RUNthat usesapk add --no-cacheon Alpine images andapt-get install --no-install-recommends(with an apt-list cleanup) everywhere else - A dependency copy + install layer, kept separate from your source so Docker can cache installed dependencies
COPY . .for the rest of the source- An optional build
RUN EXPOSE, an optional non-rootUSER, an optionalHEALTHCHECKENTRYPOINTand/orCMDin exec form (a JSON array, recommended) or shell form
How to use it
Select your stack, then adjust the tag and the install/build commands to match your project. Dependency files are copied before your full source on purpose: as long as your lockfile is unchanged, Docker reuses the cached install layer and rebuilds are fast. Leave any optional field blank to omit that instruction. When you are happy with the preview, use Copy or Download to save it as Dockerfile in your project root.
Exec form vs shell form
Exec form (CMD ["node", "server.js"]) runs your process directly as PID 1, so it receives signals like SIGTERM and shuts down cleanly — this is why it is recommended. Shell form (CMD node server.js) wraps the command in /bin/sh -c, which is handy when you need shell features such as variable expansion or &&, at the cost of a shell sitting between the runtime and your process.
Why a non-root user?
Setting USER to a non-root account limits the blast radius if the container is compromised. Many official images (like node) ship a ready-made unprivileged user. Leave the field empty if your base image has no suitable user.
Does it do multi-stage builds?
No — this tool produces a single-stage Dockerfile, which covers the most common case. For compiled languages you can still add a build command; for a slimmer final image you would hand-edit the output into a multi-stage build.
Is this a valid, buildable Dockerfile?
It follows Docker's official syntax and widely used conventions, but the commands (install, build, start) must match your actual project. Treat the output as a strong starting point and adjust as needed.
Privacy
Everything runs locally in your browser. Your image names, environment variables, commands, and generated Dockerfile are never uploaded or logged — the tool performs pure text generation on your device.