Custom Domain with CNAME and PHX_HOST

Phoenix
1

Hello, I have a Phoenix app deployed on Fly, I used the CNAME method in this guide Custom domains · Fly Docs to add my domain, but this has caused an issue where when I send emails, they are sent from fly’s domain, because of PHX_HOST = 'nellie-backend.fly.dev'

I though this was straight forward, and I could just change it here, to my domain, but when I do that and run fly deploy I see

WARNING The app is not listening on the expected address and will not be reachable by fly-proxy.achine e82d615b092478 reached started state
You can fix this by configuring your app to listen on the following addresses:
  - 0.0.0.0:8080
Found these processes inside the machine with open listening sockets:
  PROCESS                           | ADDRESSES
------------------------------------*----------------------------------------
  /.fly/hallpass                    | [fdaa:1b:306c:a7b:1ae:12fb:af48:2]:22
  /app/erts-15.1.2/bin/epmd -daemon | 0.0.0.0:4369, [::]:4369

and my app also breaks.

What is the correct way to do custom domains on Fly ?

3

It looks like your app is actually listening on port 4369, but your TOML config says that you expect it to listen on 8080. Make these the same.

4

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