For anyone coming across this in the future, you *must* add /udp to your port declaration. Despite what I found somewhere, docker compose does not default to both tcp and udp.

Anyone got any ideas?

Hi, I'm new here as I'm having trouble getting a Docker server going.
In short, it seems to get running, but my game can't connect.

I started with the default yml file, but that only got me:
ERROR: Named volume "opt/factorio:/factorio:rw" is used in service "factorio" but no declaration was found ...