[Pdns-users] udp-in-errors , AXFR and zones timeouts

[Winfried Angele]

Hi Marcello,

It looks like this is the same issue which I reported already:

https://github.com/PowerDNS/pdns/issues/9112

Maybe you can report your observations there as well.

Winfried


Am 28. Dezember 2020 21:41:21 MEZ schrieb Marcello Lupo via Pdns-users <pdns-users at mailman.powerdns.com>:
>Hello,
>I have configured a PDNS Authoritative server (v 4.4.0) with many slave
>zones provisioned with superslave and supermasters mechanism.
>At the moment I have around 1400 zones provisioned from 5 bind master
>servers.
>
>I’m getting a lot of:
>
>Dec 28 21:00:02 pdns-db2 pdns_server-global[6838]: Received serial
>number updates for 374 zones, had 19 timeouts
>Dec 28 21:05:23 pdns-db2 pdns_server-global[6838]: Received serial
>number updates for 395 zones, had 47 timeouts
>Dec 28 21:06:34 pdns-db2 pdns_server-global[6838]: Received serial
>number updates for 303 zones, had 15 timeouts
>Dec 28 21:16:07 pdns-db2 pdns_server-global[6838]: Received serial
>number updates for 394 zones, had 43 timeouts
>Dec 28 21:21:25 pdns-db2 pdns_server-global[6838]: Received serial
>number updates for 599 zones, had 66 timeouts
>Dec 28 21:22:41 pdns-db2 pdns_server-global[6838]: Received serial
>number updates for 521 zones, had 22 timeouts
>Dec 28 21:26:56 pdns-db2 pdns_server-global[6838]: Received serial
>number updates for 455 zones, had 28 timeouts
>Dec 28 21:28:08 pdns-db2 pdns_server-global[6838]: Received serial
>number updates for 235 zones, had 26 timeouts
>
>I checked with tcpdump on both the master DNS and the powerdns itself
>and all answers to the AXFR requests starting from pdns server are
>correctly received on the pdns server but seems that are not handled by
>the system and give the timeout error. The udp-in-errors counter is
>raising every time of the exact number of the timeouts received. As the
>documentation says the udp-in-errors value seems to be related to
>packet received but cannot be handled from the pdns server itself.
>I’m almost sure that it is a problem of resource tuning but I haven’t
>idea of what I should tune to avoid this behavior.
>In the short future we will need to reach around 15k domains managed by
>this DNS server and I would like to do not have this issue.
>In my scenario this server is dedicated only to the provisioning of
>domains and it do not answer to requests coming from internet. Requests
>coming from internet are handled from many servers balanced that rely
>on the mariadb replication of the PDNS DB main server.
>Do you have any ideas?
>Thank you
>Bye
>Marcello
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