[vserver] localhost - The Cliff Notes version?

OK, I'm sorry to open this can of worms again but I can't get my head
wrapped around the localhost (127.0.0.1) in guests thing.

I have guests running PostgreSQL and postfix. Both _would_ like a (or
rather pitch a bitch if there is no) localhost entry when they are
installed or an attempt is made to start them.

I've hacked my way through this but I think from watching this list
there must be an easier way to get around the messages/errors.

So in "user-dummy{1}" terms can anyone offer a solution to making
localhost auto-magically work?

I see that all the 127.0.0. IPs ping from inside a guest but I don't
want to do anything that will cause the host or other guests to die or,
for that matter, the universe to end if I just put a "localhost" entry
in /etc/hosts.

TIA,
Rod

-- 
[1] My thanks to Firefly (Out of Gas) for this alternative to clue-stick 
requests.  :-)