[dnsdist] dnsdist: Marking downstream IP:53 as 'down'
remi.gacogne at powerdns.com
Wed Mar 23 09:32:22 UTC 2022
> We have configured dnsdist instance to handle around 500k QPS, but we
> are seeing downstream down frequently once QPS reached above 25k. below
> are the logs which we found to relative issue.
> dnsdist: Marking downstream server1 IP:53 as 'down'
> dnsdist: Marking downstream server2 IP:53 as 'down'
You might be able to get more information about why the health-checks
are failing by adding setVerboseHealthChecks(true) to your configuration.
It usually happens because the backend is overwhelmed and needs to be
tuned to handle the load, but it might also be caused by a network
issue, like a link reaching its maximum capacity, or by dnsdist itself
being overwhelmed and needing tuning (like increasing the number of
newServer() directives, see ).
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