Building a Dockerfile

A production Mochi app is a single Bun process. This image is a one-stage build on oven/bun:1.4-alpine.

Minimal Dockerfile

# file: Dockerfile
FROM oven/bun:1.4-alpine
WORKDIR /app
COPY . .
RUN bun install --production
RUN bun run build
EXPOSE 3333
CMD ["bun", "run", "start"]

Build and run:

docker build -t my-app .
docker run --rm -p 3333:3333 my-app

A one-route app lands at about 160 MB. About 87 MB is the Bun binary. The floor for any Bun-based image is around 105 MB.

.dockerignore

Exclude artifacts and local state from the build context. They are regenerated inside the image:

# file: .dockerignore
node_modules
.mochi
.git
.env*

Do not add public to that list. Unlike .mochi, it is not regenerated inside the image — the runtime reads it from disk on every boot. If it does not make it in, the server warns at startup:

[mochi] publicDir "public" is missing or empty, but the build found 12 file(s) there —
every static file will 404.

--production and devDeps

bun install --production omits everything under devDependencies. Keep mochi-framework and svelte in dependencies. Move svelte-check, typescript, and build-time scripts to devDependencies.