Further problems with systemd-resolved on xubuntu 17.04

[Xen]

Chris Green schreef op 07-06-2017 11:04:
> On Wed, Jun 07, 2017 at 09:26:30AM +0100, Chris Green wrote:
>> Well, having bodged my domain name into /etc/resolv.conf it seems that
>> systemd-resolved is *still* somewhat broken.
>> 
>> When I start the system it can resolve local names OK but after a
>> while (I haven't quite determined how long it is yet, but somewhere in
>> the ten to twenty minutes area I think) it fails to resolve local
>> names, as before with SERVFAIL.
>> 
>> If I restart systemd-resolved then it works again.
>> 
>> The result of 'systemd-resolve --status' remains unchanged all the
>> time.
>> 
>> Aha!  ... in /var/log/syslog I see:-
>> 
>>     Jun  7 08:29:22 t470 systemd-resolved[955]: Switching to fallback 
>> DNS server 8.8.8.8.
>> Jun 7 08:29:33 t470 systemd-resolved[955]: Switching to DNS server 
>> 192.168.1.2
>> for interface wlp4s0.
>> Jun 7 08:31:07 t470 systemd-resolved[955]: Using degraded feature set 
>> (UDP)
>> for DNS server 192.168.1.2.
>> Jun 7 08:35:54 t470 systemd-resolved[955]: Switching to DNS server 
>> 8.8.8.8
>> for interface wlp4s0.
>> 
>> So *why* does it switch to using 8.8.8.8, plus why does it give a
>> SERVFAIL message, surely it should be a not found error.
>> 
> Yes, confirming the above, I see:-
> 
>     Jun  7 09:52:35 t470 systemd[1]: Starting Hostname Service...
>     Jun  7 09:52:35 t470 dbus[740]: [system] Successfully activated
> service 'org.freedesktop.hostname1'
>     Jun  7 09:52:35 t470 systemd[1]: Started Hostname Service.
>     Jun  7 09:53:55 t470 systemd-resolved[2603]: Switching to DNS
> server 8.8.8.8 for interface wlp4s0.
> 
> ... and again I get SERVFAIL for local names.
> 
> There's nothing else in syslog that would seem to explain why it
> switches to using 8.8.8.8, can anyone suggest a reason?

Well the real reason is that systemd likes to do things like that.

Mess with you :p

Say you want a pizza, it will give you meatballs.

But if you want meatballs, it will give you a pizza :p.


If you have two partitions in your system that happen to have the same 
label, then systemd will get confused and if you were to manually mount 
the second one then (if it is in your fstab) it will unmount it and 
mount the first one.

That would happen if you made a clone of some disk.


But I have no clue really sorry :p.

(Pointless message, I know).

I don't know why you would have a fallback DNS in any case.

You could remove it?

Lol, regards.