Run Deno in Docker

Based on this github issue, it looks like there’s still no official Docker image as of the time of this writing, but it’s in the works. In the meantime, here’s a working Docker image if you’d like to play around with Deno without the hassle of installing it locally.

We’ll create a basic web server as an example. First, create a deps.ts file and add the following dependency

export { serve } from "https://deno.land/std@0.50.0/http/server.ts";

Next, create a basic webserver in main.ts

import { serve } from "./deps.ts";

const PORT = 1993;
const s = serve(`0.0.0.0:${PORT}`);
const body = new TextEncoder().encode("Hello World\n");

console.log(`Server started on port ${PORT}`);
for await (const req of s) {
  req.respond({ body });
}

Now we can create the Docker image based on our deno app

From https://hub.docker.com/r/hayd/deno

FROM hayd/alpine-deno:1.0.0

EXPOSE 1993

WORKDIR /app

# Prefer not to run as root.
USER deno

# Cache the dependencies as a layer (this is re-run only when deps.ts is modified).
# Ideally this will download and compile _all_ external files used in main.ts.
COPY deps.ts /app
RUN deno cache deps.ts

# These steps will be re-run upon each file change in your working directory:
ADD . /app
# Compile the main app so that it doesn't need to be compiled each startup/entry.
RUN deno cache main.ts

# These are passed as deno arguments when run with docker:
CMD ["run", "--allow-net", "main.ts"]

And you can run it with this command

docker build -t app . && docker run -it --init -p 1993:1993 app

Now just open up a new terminal or browser to access the url

$ curl localhost:1993
Hello World

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