[Pdns-users] servfail-packets>0 but no data in servfail-queries ring buffer

[Martin Kellermann]

Hi,



PowerDNS Auth Server 4.3.0 with PostgreSQL backend



I'm facing the fact, that sometimes the servfail-packets counter increases and i would debug this and find the reason why PowerDNS sends out a "servfail" packet.

Actually today the counter increased from 0 to 2 and i don't know why!

https://doc.powerdns.com/authoritative/performance.html#servfail-packets tells me, that this is due to a database problem.

https://doc.powerdns.com/authoritative/performance.html#ring-buffers tells me that the servfail-queries ring-buffer shows which queries have been causing servfails.

But when i look at this ring-buffer (server:8081/?ring=servfail-queries) there are no entries - it's empty.



can someone please explain, what am i missing or not understanding correctly?



I noticed this behaviour for a long time and over different versions (4.1, and 4.2).

Last time i asked, there was no answer: https://mailman.powerdns.com/pipermail/pdns-users/2019-February/025767.html



Thanks!



Regards



MK
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