[Pdns-users] Notification for domains to ip1:53 failed after retries

[Steve Zeng]

Arsen,

My PowerDNS is a slave, it is then send notifications to quite a few other slaves. So it is a chain. it is noticed that the delay is between PowerDNS (first tier slave) and BIND slaves (second layer slave). 

The PowerDNS settings are below, based on https://github.com/PowerDNS/pdns/issues/338

slave=yes
slave-renotify=yes

Thanks,
Steve

> On Jan 17, 2018, at 4:02 PM, Arsen STASIC <arsen.stasic at univie.ac.at> wrote:
> 
> Steve,
> 
> If your powerdns is configured as master within your bind's conf for that zone, it will do a SOA query and if neede a zonetransfer within a second.
> 
> cheers,
> -arsen
> 
> * Steve Zeng <steve.zeng at booking.com> [2018-01-17 15:43 (+0100)]:
>> Klaus,
>> 
>> Good to know. when would BIND do a SOA query to the configured master to check the serial? Is it immediately right after it get NOTIFY from master?
>> 
>> Thanks,
>> Steve
>>> On Jan 17, 2018, at 3:32 PM, Klaus Darilion <klaus.mailinglists at pernau.at> wrote:
>>> 
>>> 
>>> 
>>> Am 17.01.2018 um 15:13 schrieb Steve Zeng:
>>>> Pieter,
>>>> 
>>>> I checked BIND slaves logs around the time frame and found:
>>>> 
>>>> 10-Jan-2018 18:11:17.211 notify: client 10.198.180.41#12149: received notify for zone 'example.com'
>>>> 10-Jan-2018 18:11:17.211 general: zone lhr4.dqs.booking.com/IN: notify from 10.198.180.41#12149: no serial
>>>> 10-Jan-2018 18:11:24.387 notify: client 10.198.180.41#12149: received notify for zone 'example.com'
>>>> 10-Jan-2018 18:11:24.387 general: zone lhr4.dqs.booking.com/IN: notify from 10.198.180.41#12149: no serial
>>>> 10-Jan-2018 18:11:29.453 notify: client 10.198.180.41#12149: received notify for zone 'example.com'
>>>> 10-Jan-2018 18:11:29.453 general: zone lhr4.dqs.booking.com/IN: notify from 10.198.180.41#12149: no serial
>>>> 10-Jan-2018 18:11:38.350 notify: client 10.198.180.41#12149: received notify for zone 'example.com'
>>>> 10-Jan-2018 18:11:38.350 general: zone lhr4.dqs.booking.com/IN: notify from 10.198.180.41#12149: no serial
>>>> 
>>>> wondering why there is ’no serial’ in the logs. Since the column does have the value:
>>>> 
>>>>> select * from domains where name='example.com'\G;
>>>> *************************** 1. row ***************************
>>>>            id: 484
>>>>          name: example.com
>>>>        master: 10.187.125.2:53,10.187.125.2:53
>>>>    last_check: 1516197871
>>>>          type: SLAVE
>>>> notified_serial: 2016918645
>>>> 
>>>> is “no serial” the cause of notification failure?
>>> 
>>> I do not think this is the problem. NOTIFYs may have serials, but
>>> without serial is also allowed. And PowerDNS does not send serials.
>>> 
>>> Usually, when there is no serial, Bind will do SOA-Queries to the
>>> configured masters to check the serial on the master.
>>> 
>>> regards
>>> Klaus
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