Dockerfile & Docker Compose Generator

About the Dockerfile & Docker Compose Generator

Choose your stack — Node.js, Next.js (standalone), a static site served by nginx, Python behind gunicorn or uvicorn (pip, Poetry or uv), Django, Go, Rust, Java with Maven or Gradle, .NET (ASP.NET Core), PHP or Laravel on Apache or PHP-FPM with nginx — or drop package.json, requirements.txt, pyproject.toml, go.mod, Cargo.toml, pom.xml, build.gradle, composer.json or a .csproj and the page sets the stack, versions and commands for you.

You get a multi-stage Dockerfile that follows each official image: base images pinned to a supported version line, dependencies installed before the source is copied so a code change does not reinstall them, BuildKit cache mounts, an unprivileged user in the image that runs, a HEALTHCHECK where the image has a tool for one, and the exec form for the command so the app receives docker stop’s SIGTERM. A matching .dockerignore keeps .git, local .env files and build folders out of the build.

Tick Docker Compose to add a compose.yaml with PostgreSQL, MySQL, MariaDB, Redis, Valkey, MongoDB or RabbitMQ — each with a named volume, a healthcheck and the app waiting for it with depends_on: condition: service_healthy — an .env.example for the passwords, and an optional HTTPS reverse proxy for your domain: Caddy with its Caddyfile, or Traefik with Let’s Encrypt labels. Every Dockerfile is checked with the Dockerfile Linter’s rules and every compose.yaml is resolved by the Docker Compose Visualizer’s parser before you see it. Nothing is uploaded. Without a pass the result is a free preview: the build stages of the Dockerfile, the list of files and every check; the image that runs, the other files and the ZIP unlock with a Pro pass.

Common uses

• Containerising an existing app without copying a Dockerfile from a blog post that runs as root.
• Moving a project to a VPS with its database, cache and HTTPS in one compose.yaml.
• Getting a smaller, safer image: build tools stay in the build stage, the runtime image has only what the app needs.
• Starting a new service with the build cache, health check and .dockerignore right from the first commit.

What each Dockerfile does

• Node.js and Next.js: npm ci, pnpm install --frozen-lockfile or yarn install --immutable in a dependencies stage, the build in its own stage, and only the production dependencies and the build output in the image. Node.js 25 and later images no longer include Corepack, so the generator installs it there for pnpm and Yarn. Next.js copies .next/standalone and .next/static, as its official example does.
• Python and Django: a virtual environment (pip), Poetry’s in-project environment or uv sync --locked --no-editable in the build stage, copied into a slim runtime with PYTHONUNBUFFERED=1; gunicorn or uvicorn starts the app, and Django can run collectstatic while building.
• Go and Rust: a static Go binary (CGO_ENABLED=0, -trimpath) or a release Cargo binary, built with cache mounts, then copied alone into distroless, Alpine or Debian slim.
• Java: Maven or Gradle (or your wrapper) builds the JAR; Eclipse Temurin JRE, Alpine or distroless runs it with -XX:MaxRAMPercentage=75.
• .NET: dotnet restore and dotnet publish -a $TARGETARCH in the SDK image, the ASP.NET Core runtime with the images’ own non-root user (USER $APP_UID) on port 8080.
• PHP and Laravel: Composer without dev packages, extensions through install-php-extensions, PHP’s production php.ini, and Apache on an unprivileged port — or PHP-FPM plus an nginx target, with Laravel’s documented server block.

Health checks that work in each image

A HEALTHCHECK must use a program the image has. Node.js images check with node -e and fetch(), Python images with urllib, Alpine images with BusyBox wget, PHP’s Apache image with curl, and PHP-FPM with an FPM ping through cgi-fcgi. JRE, Debian and .NET runtime images have no HTTP client, so the generator installs curl for the check. Distroless and chiseled images have no shell or HTTP client at all: their Dockerfile says HEALTHCHECK NONE with the reason, and your orchestrator’s HTTP probe takes over. Django needs 127.0.0.1 in ALLOWED_HOSTS for its check to pass.

Compose services and HTTPS

• Every service has a named volume and a healthcheck: pg_isready for PostgreSQL 18 (its data lives under /var/lib/postgresql), mysqladmin ping for MySQL, the image’s healthcheck.sh for MariaDB, a password-protected PING for Redis and Valkey, mongosh for MongoDB and rabbitmq-diagnostics -q ping for RabbitMQ.
• Passwords are read from .env as ${NAME:?…}, so Compose refuses to start while one is missing, and the app gets its connection string (DATABASE_URL, REDIS_URL, MONGODB_URI, AMQP_URL, or Laravel’s DB_*).
• Caddy gets its certificates by itself; Traefik uses a Let’s Encrypt resolver (it needs an e-mail address) and reads labels through the Docker socket, which the checks explain. Without a proxy the app is published on 127.0.0.1 unless you choose every interface.
• MinIO is not offered: its repository was archived and the community edition is distributed as source code only, with no further releases. Use your cloud’s object storage or another maintained S3-compatible store.

Images and sources

Base images are pinned to a version line (node:24-trixie-slim, python:3.14-slim-trixie, golang:1.27-trixie, rust:1.99-slim-trixie, eclipse-temurin:25-jre, mcr.microsoft.com/dotnet/aspnet:10.0, php:8.5-apache, nginxinc/nginx-unprivileged:1.30-alpine), so rebuilds get security fixes without jumping a major version. To pin an exact image, run docker buildx imagetools inspect <image> and add @sha256:<digest> to the FROM line. Sources: Dockerfile reference, Docker build best practices, Compose file reference, Docker Official Images, Next.js Docker example, uv in Docker, .NET container images, Distroless, Laravel deployment.

Limitations

• The page writes files; it cannot build or run them. Try the image locally with docker build and docker run before you deploy it.
• Version lines are the ones the generator knows; type another version if its image exists, and check new major versions against your app.
• Monorepos, private package registries, native build dependencies and apps that read files outside the build folder need edits the generator cannot guess: each Dockerfile says where.
• Docker Swarm, Kubernetes manifests and CI pipelines are not written here; the Kubernetes Manifest Generator covers manifests.

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