alpine 0.31.0 COPY failed about deno_docker

[hayd]

Oh, I see your snippet is from the README! Sorry about that, I will amend.

[hayd]

Oh, maybe this was the issue:

NOTE: I have no deps.ts file in my source directory

If you don't have a deps.ts then you should remove the deps.ts lines in the Dockerfile.

I recommend to have a deps.ts as this caches all of the dependencies and allows quicker iteration cycle (as dependencies don't need to be downloaded/compiled on each build).
In your case deps.ts would be:

// deps.ts
export { Application, Router } from "https://deno.land/x/oak/mod.ts";

// main.ts
import { Application, Router } from "./deps.ts";

const router = new Router();
router
...

[hayd]

If you change to

app.listen(`:1993`);

your example works (at least for me).

I suspect this is something to do with internal IP addresses inside the container... 🤷‍♂
(Perhaps https://stackoverflow.com/q/24319662/1240268 ?)

---

Note: This is a very simple example only meant to get my into a Docker container. I only have 3 files in the root of the directory (no other directories):

This should be sufficient (COPY and fetching deps.ts, then everything else) for even more complex deno projects (although the deno-lambda one I link to above is more complicated - since I want to aggressively cache compilation inside layers).

I'd eventually like to use this Docker container on an Azure App Service.

It reads in the documentation that this ought to be straightforward... it looks like the port to EXPORT will have to be 8000 (instead of 1993).

https://docs.microsoft.com/en-us/azure/app-service/containers/tutorial-custom-docker-image

[aadamsx]

Yes, just changing the line to:

app.listen(`:1993`);

Worked for me as well.

[aadamsx]

Maybe I will.

Also, I also got this working locally by using this line too:

app.listen(`0.0.0.0:8000`);

[hayd]

Can you try with:

COPY deps.ts .

Similarly:

ADD . .

See the example: https://github.com/hayd/deno-docker/blob/master/example/Dockerfile

(And a more complicated example in deno-lambda)

[aadamsx]

Added deps.ts file:

export { Application, Router } from "https://deno.land/x/oak/mod.ts";

Modified main.ts file for deps.ts:

import { Application, Router } from "./deps.ts";

const router = new Router();
router
  .get("/", context => {
    console.log('called /');
    context.response.body = "Hello world!";
  })
  .get('/fetch', async context => {
    console.log('called /fetch');
    const res = await fetch('https://pokeapi.co/api/v2/pokemon/ditto/')
      .then(res => res.json());
    context.response.body = JSON.stringify(res);
  });

const app = new Application();
app.use(router.routes());
app.use(router.allowedMethods());

console.log('started on 1993');

app.listen(`127.0.0.1:1993`);

Updated the Dockerfile:

FROM hayd/deno:alpine-0.31.0

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 .
RUN deno fetch deps.ts

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

ENTRYPOINT ["deno", "run", "--allow-net", "main.ts"]

Now it builds:

docker build -t app .

And runs:

docker run -it --init -p 1993:1993 app

started on 1933

But when I try to curl > curl http://localhost:1993

curl: (52) Empty reply from server

Note: This is a very simple example only meant to get my into a Docker container. I only have 3 files in the root of the directory (no other directories):

• depts.ts
• Dockerfile
• main.ts

Just in case it matters somehow or you have some insight on this: I'd eventually like to use this Docker container on an Azure App Service.

Thank you for the help so far.

[aadamsx]

Just wanted to follow up.

I was able to deploy this image to ACR and then created an Azure web app from that running Deno. So basically a containerized Deno web app in Azure -- one step from serverless Deno.

Thanks again for your help!

[hayd]

Great! If you ever write anything up about this I'll happily link to it in the project (I think people will find it useful in the future).