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

[Steve Zeng]

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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