# Containers `husk build --docker` generates a Dockerfile that packages your skills folder and serves it with HUSK. The container runs the exact same skills you developed locally. ```bash husk build --docker ``` This writes a `Dockerfile` (and a `.dockerignore` if absent): ```dockerfile FROM oven/bun:1 WORKDIR /app # Install the HUSK CLI globally. RUN bun add -g @elisym/husk # If your kernels need other runtimes (python3, ffmpeg, ...), install them here: # RUN apt-get update && apt-get install -y python3 && rm -rf /var/lib/apt/lists/* COPY skills ./skills ENV HUSK_PORT=3000 EXPOSE 3000 CMD ["husk", "serve", "skills", "--host", "0.0.0.0", "--port", "3000"] ``` ## Build and run ```bash docker build -t my-skills . docker run -p 3000:3000 my-skills ``` ## Options | Flag | Default | Notes | | ---------------- | -------- | --------------------------------------- | | `[dir]` | `skills` | Skills directory copied into the image. | | `-p, --port

` | `3000` | Port the container serves on. | | `--force` | off | Overwrite an existing `Dockerfile`. | :::warning A fresh `Dockerfile` is never overwritten unless you pass `--force`, so your customizations are safe. ::: ## Kernel dependencies The base image is `oven/bun:1`, which has Bun but not much else. If a kernel needs another runtime or system tool - `python3`, `ffmpeg`, `rembg`, ImageMagick - install it in the Dockerfile before the `COPY` line. The generated file includes a commented `apt-get` example to start from. ```dockerfile RUN apt-get update && apt-get install -y python3 ffmpeg && rm -rf /var/lib/apt/lists/* ``` ## Passing secrets Kernels inherit the server's environment, so provide API keys at run time rather than baking them into the image: ```bash docker run -p 3000:3000 -e ANTHROPIC_API_KEY=sk-... my-skills ```