Example docker-compose.yml not working (port mapping + loopback)

[jonaaix]

As mentioned in some earlier issues (#611, #493, #480), the given docker-compose.yml on hub.docker.com with port mapping 8080:80 does not work, because the port mapping itself breaks the loopback, resulting in two critical errors:

So it should be either added a necessary step to fix this issue with port mapping (which I am currently not aware of), or it should be changed to port 80:80, which currently solves the issue, mentioning that other port mappings currently will not work.

[wglambert]

I'm not able to reproduce

Using the docker-compose.yml from https://github.com/docker-library/docs/tree/master/wordpress#-via-docker-stack-deploy-or-docker-compose