Hi guys, We're running two PowerDNS authoritative instances v4.3.0/4.3.1 (upgraded today) with a self-written remote backend.
>From time to time we see small, 1-2 minute long spikes of servfail responses. In these timeframes one-third of all responses sent by PowerDNS are servfail responses, the other two-thirds are successful. https://img.steinh.art/1e7J10Qu.png - These spikes typically occur two or three times a day, at different times the day on both DNS servers. - There is no relation to the type of DNS records being queried. It affects any type e.g. A, AAAA, SRV, etc. I don't how much PDNS relies on the remote backend in online signing mode, but the problem also occurs with DS records. - It's not related to the query name. I can query a name with the same name as 10 minutes later and it's working fine. - There are no spikes in other server metrics like CPU, memory, etc. Luckily PowerDNS is logging why these servfails occur: > Exception building answer packet for britishgerbil.aternos.me/DS (Attempt > to print an unset dnsname) sending out servfail But unfortunately, I don't have any clue what this means. I also checked our remote backend of course and everything looks fine there. I don't know if my assumption is correct, but the fact that DS records are generated by PDNS (in online signing mode) and are affected too I would say that it's not related to the remote backend? Maybe someone of you has a hot hint for me or can explain what that error message tries to tell me :) Thanks in advance. ~ Roman
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