Bug#766943: server no longer gets networking after switching to systemd

[Christoph Anton Mitterer]

I just made some new tests.

It seems the issue appears less often then before (where it failed in
like 9 out of 10 boots),... this time it's more like failure in 3 of 4
boots.
But there was a new kernel, and maybe that somehow changed some timing
issues?


Anyway, attached is a new log files from the network-restarter.log.2,
I've also changed /etc/init.d/networking a bit more (even during the
runs) to give more debug output, so I'm attaching that as well

All the tests here were run with allow-auto eth0.

I've added a 2nd ifup in /etc/init.d/networking, so there is no one that
starts "immediately" after the init script is run, then there is a sleep
of 30 seconds and then there is another ifup.
All of them are surrounded by outputting ifconfig to the
network-restarter.log.2. In the last run, I've also added outputting the
exit codes of ifup.

In the log I've added a bunch of more newlines between reboots.



What one can basically see, especially at the last run, is:

- lo is already up before /etc/init.d/networking,... well I guess
systemd is taking care on this before?

- It happens (actually more often then you'd guess from that log excerpt
of my tests - as I've said roughly 3 out of 4 times now), that after the
first ifup (i.e. before any sleep) no further interfaces are brought
up...
In these tests, eth0 always came up at least after the 2nd ifup, this is
why my cron job never had to kick in (and I didn't even include the
output of that, i.e. what I've called network-restarter.log before).

- when ifup fails to bring up the interface, it doesn't even tell so via
it's exit status.


Which kinda emphasizes the suspicion that this is an issue in ifupdown.
This and also the problem that *even* when the interface *was* brought
up, it still seems to happen that daemons cannot yet bind to their
addresses....?


Cheers,
Chris.
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