internal port base_url not correct when using mapped port

[alexbossers]

Version 8.4

in docker-compose.yml changed ports: - "81:80"
to map internal molgenis port 80 to 81 on my machine since 80 is taken by another process.
Docker comes up and allows login window. But as soon as given credentials it maps to localhost/login instead localhost:81/login. Deadend.

Is there a base_url configuration to provide in docker-compose-yml?

[fdlk]

The frontend service runs an instance of nginx that proxies the backend. It tells the backend about the port number it is running on using X-Forwarded-* headers set in the backend.conf file.
If you want to change the port number that nginx is exposed on, you'll also have to fill in the port number there, I think.