Unable to find Dockerfile

[greg]

Hmm

First, yep, Fly will default to looking for a Dockerfile in the root folder of the application. And complain if it’s not there.

Looking at the repo, indeed it’s not there. So you could make a copy there, in the root. Or debug why dockerfile = "packages/server/Dockerfile" doesn’t work. Since that would indeed normally be the solution to this (like if you have a Dockerfile called something else, like Dockerfile.txt you would do dockerfile = "Dockerfile.txt").

However I’m wondering if the problem you’re running into there is the presence of this line:

TeemuKoivisto/realtime-multiplayer-in-html5/blob/main/.dockerignore#L5

Since Dockerfile is treated differently when ignored. Take a look at:

Dockerfile style builds fail if container definition file is in .dockerignore (and not `Dockerfile`)

This appears to be a specific Docker feature which treats Dockerfile differently when it’s ignored. From the docs: You can even use the .dockerignore file to exclude the Dockerfile and .dockerignore files. These files are still sent to the daemon because it needs them to do its job. But the ADD and COPY instructions do not copy them to the image. The Docker daemon running on our remote hosts needs the Dockerfile to run the build against the uploaded context. But it should not show up in the …

So I’d try removing it from .dockerignore and/or copy to the root folder depending on that. Those are going to be easiest to debug/edit. Then it should be able to find it.