[BUG] hostname -i can return more than one IP address.

[b-a-t]

Tag/version of Container Images
0.3., 0.4.

We do run mailman-* containers in the environment, orchestrated by SaltStack, so it is different from the reference docker-compose setup in some aspects.

In particular, all containers are sitting in two docker networks, bridge and mailman-net, which allows them to communicate locally and have resolvable local hostnames.

One of the side effects of such a setup is that hostname -i command returns:

# hostname -i
172.17.0.3 172.18.0.3

which then confuses configs where MM_HOSTNAME is used.

So, something like hostname -i | awk '{ print $NF }' could be a safer option(I'm picking the last IP in the list as that's what the internal network would get if ever used).

I actually ended up setting setting MM_HOSTNAME: '0.0.0.0', which seems to be a pretty universal option for the container(s) anyhow.