[Bug 1789097] Re: winbind does not work after reboot on Mint 19 / Ubuntu 18.04

[Andreas Hasenack]

I'm trying to check why winbind won't recover from the network being
down, so I setup a lxd container where I installed just winbind and the
nss module.

My /etc/nsswitch.conf reads:
hosts:          files wins dns

(I would have ordinarily put dns before wins, but ok, let's try to
reproduce this)

smb.conf has:
[global]
...
        wins server = 10.10.222.254

That IP is another samba server I have.

I then disabled dhcp on eth0, and rebooted the container. It came back
up with no IP on eth0. winbind was running, and name resolution via wins
was obviously not working. I logged in using "lxc exec <containername>
bash" instead of ssh).

I then just ran "dhclient eth0", and retried the name resolution (ping
-c <netbiosname> was my test), and it worked right away. So it was able
to use the newly functional interface.

I didn't see anything out of the ordinary in winbind's logs.

I'll try again with a vm, which should be a bit slower than a lxd
container. And maybe also try without a network card at all, then add
one, and see if winbind needs to be restarted.

In the meantime, can you perhaps grab me some winbind logs during a
machine boot showing the problem? Maybe add "debug level = 3" or 5 to
smb.conf as well.

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https://bugs.launchpad.net/bugs/1789097

Title:
  winbind does not work after reboot on Mint 19 / Ubuntu 18.04

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