<p dir="ltr">Hi guys,</p>
<p dir="ltr">It is happen for me as well on 2 different dnsdist with 3 pdns recursor behind them. There is any way to debug this problem from pdns recursor side?</p>
<p dir="ltr">Federico</p>
<div class="gmail_quote">On 16 Feb 2016 15:11, "Remi Gacogne" <<a href="mailto:remi.gacogne%2Bdnsdist@powerdns.com">remi.gacogne+dnsdist@powerdns.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Alejandro,<br>
<br>
> Can I enable verbose for loggin??<br>
<br>
Unfortunately we are not logging more information regarding health check<br>
failures, even at verbose level. That's mostly because it might fill up<br>
your logs very quickly otherwise.<br>
<br>
Based on the messages you posted, only one health check fails and the<br>
next ones are fine. So basically, dnsdist sent a UDP query and<br>
either did not get any response at all in less than one second, or the<br>
response was invalid:<br>
- complete garbage or<br>
- response ID not matching the query ID or<br>
- QR flag not set or<br>
- ServFail or<br>
- NXDomain or Refused (only considered an error if you have set<br>
mustResolve to true for this backend).<br>
<br>
If you don't have a lot of traffic you might be able to see what happen<br>
by using tcpdump.<br>
<br>
Perhaps we should add an option to consider a backend as down only after<br>
several checks failed in a row. Maybe some counters for health check<br>
failures might help too.<br>
<br>
--<br>
Remi Gacogne<br>
PowerDNS.COM BV - <a href="https://www.powerdns.com/" rel="noreferrer" target="_blank">https://www.powerdns.com/</a><br>
<br>
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