Configuring the expected address the app should listen on

1

Here’s the issue I have in terminal.

WARNING The app is not listening on the expected address and will not be reachable by fly-proxy.d6bd564e8 [app] update finished: success
You can fix this by configuring your app to listen on the following addresses:
  - 0.0.0.0:3000

However, it doesn’t say where and how I can configure my app’s address. How can I do that in an Next.js/Prisma application? I’m specifically talking about the 0.0.0.0, since my Dockerfile already expose 3000 and my fly.toml already has internal_port = 3000.

2

The onus is on your app to bind to the host/port, not fly. Nextjs’ default host:port is 0.0.0.0:3000, so you may be doing something that’s overriding the default.

3

Then what am I likely doing that’s overriding the default if that’s the case? And is there somewhere in some settings where I can modify this?
Meaning I can modify the 3000 part in my Dockerfile et fly.toml, but there’s nothing that shows I can do the same for 0.0.0.0.

4

I wrote ENV HOSTNAME “0.0.0.0” in the Dockerfile to force the hostname and it solved the issue.

5

how are you starting the next server? If you built the standalone, it should have set the host to 0.0.0.0

In either case, you should bind to [::] so you talk to other instances via flycast

6

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