Why does this use a multi-stage build instead of a single FROM line?

Because the compilers, dev dependencies, and build tools needed to produce your app (npm devDependencies, the Go/Rust toolchain, etc.) don't need to ship in the image that actually runs in production. A multi-stage build compiles or installs everything in a throwaway 'builder' stage, then copies only the finished output into a small, clean runtime image — smaller size, faster pulls and deploys, and a smaller attack surface.

Why does the generated Dockerfile run as a non-root USER instead of the default root?

Containers run as root by default unless told otherwise, so a vulnerability in your app or its dependencies gets root inside the container for free. Adding a non-root USER limits the blast radius: even if an attacker gets code execution, they land as an unprivileged user, which blocks a lot of common container-escape and host-tampering techniques.

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Dockerfile Generator

Pick a stack, fill in a few fields, get a ready-to-use Dockerfile — pinned base image, non-root user, and dependency layers ordered before the rest of your source so Docker's build cache actually works. Nothing is ever uploaded.

Stack

Node.js

Package manager

Port

Entry point (built file the runtime image runs)

Assumes a build script (e.g. TypeScript/webpack/vite) outputs into the leading folder of this path — adjust if your build output directory differs.

Python

Entry point (script to run)

Port

Assumes dependencies are listed in requirements.txt.

Package path to build

Binary name

Port

Rust

Binary name (must match [package] name in Cargo.toml)

Port

Static site (Nginx)

Build output directory

Port

Uses the unprivileged Nginx image so it can run as a non-root user — that's why the default port is 8080, not 80 (non-root processes can't bind ports below 1024).

Generated Dockerfile

How it works

Node.js, Go, and Rust use a multi-stage build: a "builder" stage installs full dependencies and compiles the app, then a separate, minimal runtime stage copies over only the finished build artifact (a bundled JS output, a static Go binary, a compiled Rust binary) — the compilers, dev dependencies, and build caches never end up in the image you actually ship. Every stack copies dependency manifests (package.json/lockfile, requirements.txt, go.mod, Cargo.toml) and installs dependencies in their own layer before copying the rest of your source, so Docker's layer cache stays valid — and dependency installs get skipped on rebuilds — as long as you haven't touched your manifest, even if your application code changes constantly. Every generated Dockerfile also ends with a non-root USER instruction and a pinned, versioned base image tag instead of :latest.

FAQ

Why does this use a multi-stage build instead of a single FROM line?: Because the compilers, dev dependencies, and build tools needed to produce your app (npm devDependencies, the Go/Rust toolchain, etc.) don't need to ship in the image that actually runs in production. A multi-stage build compiles or installs everything in a throwaway 'builder' stage, then copies only the finished output into a small, clean runtime image — smaller size, faster pulls and deploys, and a smaller attack surface.
Why does the generated Dockerfile run as a non-root USER instead of the default root?: Containers run as root by default unless told otherwise, so a vulnerability in your app or its dependencies gets root inside the container for free. Adding a non-root USER limits the blast radius: even if an attacker gets code execution, they land as an unprivileged user, which blocks a lot of common container-escape and host-tampering techniques.

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