Re: Postfix

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Tim:
> > Bearing in mind that even *then* there have been cases of the network
> > not actually being up and running before being declared it was.  I'm
> > beginning to think we need either a post-boot target, or at least an
> > improvement on the network is up decision making.

Benny Lyne Amorsen:
> network-online.target is documented as being "best effort". In the
> current days of very complicated networking, there is no way to know for
> sure that the network is actually up or what it means for network to be
> up.

Yes, there's multiple interfaces with differing uses.

An internal mail system might only need localhost, and that can come up
quite quickly.  Something else might need PC to PC intranet working,
which may take longer, and depend on both ends coming up, before it's
ready for use.  And then an internet connection becoming useful might
take even longer.

A network is UP flag could individually indicate each one, and your
services could pay attention to *your* choice of which network they
needed.

Or it could be an everything is ready now flag, though that could
stymie a bunch of things that really didn't need to wait for that last
thing to come alive.  All my LAN traffic, for instance, doesn't need
any internet service at all for it to do whatever it's going to do.

But just the first thing coming up declaring the network is up is
probably no use.

There was a whole chain of events with the original poster.  When the
system comes up as multiuser, start up postfix.  But postfix must first
wait for the network (or at least the bits of it needs) to come up.

I've had that issue with NTP.  If you tried to start it before the
network (which was its default), it'd start, find there's no network,
and go into a self-contained mode and never try to access the network
again.  There's one or two services that I've put restart rules for
when the network statuses change, and I've done that as network change 
rules, not rules for those services.

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