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Generators

Dockerfile Generator

Generate a production-ready Dockerfile and matching .dockerignore for Node, Python, Go, Java, Ruby, PHP, and more.

Dockerfile Generator
Client-side

About this tool

The Dockerfile Generator produces a working Dockerfile from a short form. Pick a base image preset — Node, Python, Go, Java, Ruby, PHP, Nginx, or plain Alpine — and it fills in a correctly versioned, non-:latest base image, a preset-appropriate default install command, and a working WORKDIR/COPY/RUN/CMD sequence in the right order for Docker's layer cache to actually help — dependency manifests are copied and installed before the rest of the source, so code-only changes don't bust the install layer.

Toggle a non-root user and the generator adds the correct incantation for the base distro: addgroup -S / adduser -S for Alpine images, groupadd --system / useradd --system for Debian-based ones. Toggle .dockerignore generation and you get a matching ignore file with sensible defaults for the chosen stack, shown and downloadable separately from the Dockerfile itself.

Every field — workdir, copy pattern, install/build/start commands, exposed port — is editable, so the presets are a fast starting point rather than a rigid template. All generation is pure string templating that runs in your browser; nothing is uploaded.

FAQ

Why does the generator warn against using :latest as the base image tag?
The :latest tag is a moving target — it can point to a different image tomorrow than it does today, which breaks reproducible builds. Every preset defaults to a specific version tag, though you can override it.
Why is USER set up differently for Alpine vs. Debian-based images?
Alpine uses BusyBox's lightweight addgroup/adduser utilities, while Debian/Ubuntu-based images use GNU groupadd/useradd with slightly different flags. Using the wrong syntax will fail the build, so the generator switches automatically based on which preset you pick.
Why does running as a non-root user matter?
If a container is compromised, running as root inside gives an attacker root-equivalent capabilities within that container's namespace. A dedicated non-root user limits what a compromised process can do.
Does this build a multi-stage Dockerfile?
No, it generates a single-stage Dockerfile focused on getting a correct, working build fast. For compiled languages where multi-stage meaningfully shrinks the final image, copy the generated RUN steps into a builder stage manually.
What goes in the generated .dockerignore file?
It includes the defaults appropriate to the chosen base image preset — for example node_modules, .git, and .env for Node — plus the Dockerfile and .dockerignore itself.