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Deno Dockerfile generator

Generate a production Dockerfile for a Deno app with a pre-cached module graph and an explicit permission set.

Configure

Used for the image tag, the compose service and the OCI labels.
The port the app listens on inside the container. Keep it above 1024 so the process can bind it without root.
The module Deno runs on start.
Deno denies everything by default. List only what the app actually needs — this is the security model, not boilerplate.
Adds the database to docker-compose.yml with a healthcheck, a named volume and a DATABASE_URL wired into the app.
Adds Redis to docker-compose.yml and exposes REDIS_URL to the app.

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What this Dockerfile does

Nothing flagged

  • Good practice: Multi-stage build (4 stages)

    Compilers, dev dependencies and source files stay in the build stages. Only the runtime artefacts are copied into the final image.

  • Good practice: Runs as deno, not root

    A container escape from a root process is a host root process. Dropping privileges is the cheapest hardening step there is.

  • Good practice: .dockerignore keeps secrets out of the build context

    `.git`, `.env` and local dependency folders never reach the daemon, so they cannot end up in a layer or in `docker history`.

  • Good practice: Dependency cache persists across builds

    BuildKit cache mounts keep the package manager store outside the image. Rebuilds after a lockfile change reuse everything already downloaded, and the cache adds nothing to the final size.

  • Good practice: Healthcheck defined

    Docker, Compose and Easypanel can tell the difference between a running process and a working app, and restart it when it wedges.

  • Good practice: Runs with an explicit permission set

    Deno denies filesystem, network and environment access unless it is granted. Anything not listed here simply cannot happen at runtime.

  • Good practice: Module graph resolved at build time

    `deno cache` downloads and type-checks every dependency during the build, so a cold start never blocks on a network fetch.

  • Note: Requires BuildKit

    BuildKit is the default builder in Docker 23 and later. On anything older, export `DOCKER_BUILDKIT=1` before building.

  • Note: Estimated image size: ~60–120 MB

    A rough band for the final stage, before your own dependencies. Run `docker images` after a build for the real number.

How to use it

Everything runs locally. Nothing is uploaded, and no account is needed.

  1. Drop the files into your project root

    Every generated file belongs next to your package manifest — the Dockerfile references paths relative to the build context, so nesting them in a subfolder breaks the COPY lines.

  2. Build the image

    docker build -t deno-app .

  3. Run it

    docker run --rm -p 8000:8000 deno-app

  4. Or bring up the whole stack

    docker compose up --build

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