[Pdns-users] Negative cache upon zone creation

[Andrea Biscuola]

Hi.

On Thu, 24 Feb 2022 21:15:04 +0100
Klaus Darilion <klaus.darilion at nic.at> wrote:

> IIRC you are right. But there were several updatest o the zone cache after release. If you use 4.5 make sure to use latest 4.5.x version. regards
> Klaus

And that's exactly what we do. The "real" authoritative DNS servers are updated using
the MySQL replication mechanism, non through the APIs.

> -----Ursprüngliche Nachricht-----
> Von: Lucas Rolff <lucas at lucasrolff.com> 
> Gesendet: Donnerstag, 24. Februar 2022 16:58
> An: Klaus Darilion <klaus.darilion at nic.at>
> Cc: Andrea Biscuola <andrea.biscuola at host.it>; Pdns-users at mailman.powerdns.com
> Betreff: Re: [Pdns-users] Negative cache upon zone creation
> 
> zone-cache-refresh-interval should only be changed if updating the backend directly right? If using the API, this setting shouldn’t matter - as far as I know, the API will invalidate the zone-cache.
> 
> > On 24 Feb 2022, at 23:30, Klaus Darilion via Pdns-users <Pdns-users at mailman.powerdns.com> wrote:
> > 
> > Have you really disabled all caches? Also https://doc.powerdns.com/authoritative/settings.html#zone-cache-refresh-interval ?
> > regards
> > Klaus
> > 
> > -----Ursprüngliche Nachricht-----
> > Von: Pdns-users <pdns-users-bounces at mailman.powerdns.com> Im Auftrag von Andrea Biscuola via Pdns-users
> > Gesendet: Donnerstag, 24. Februar 2022 15:12
> > An: pdns-users at mailman.powerdns.com
> > Betreff: [Pdns-users] Negative cache upon zone creation
> > 
> > Hello.
> > 
> > In our PowerDNS setup, all of the PowerDNS authoritative server caches are turned off, apart for the max-packet-cache-entries setting that is set to the default, as the same service is given by a series of DNSDist daemons running on top of the PowerDNS ones.
> > 
> > However, querying one of the PowerDNS servers directly for a zone that does not exists, extends the negative response way after we created the zone. This affects some automated systems, where the DNS servers are automatically changed a the registrar, causing the registrar verification process to fail.
> > 
> > So, to recap:
> > 
> > 1 - We query PowerDNS (NOT DNSDist) for a non existing zone.
> > 2 - Correctly, PowerDNS responds that the zone does not exists.
> > 3 - In the meantime we create the zone.
> > 4 - PowerDNS continues to respond with a negative response after the zone is created.
> > 5 - PowerDNS gives us the proper response, only after we stop querying it for some time.
> > 
> > Are we missing something? Or is it expected to work just like that? Then we could accomodate our software for that.
> > 
> > Thank you.
> > 
> > Andrea
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Andrea