Recursive bind becomes unresponsive with high load
John Miller
johnmill at brandeis.edu
Thu Mar 31 19:47:55 UTC 2016
On Thu, Mar 31, 2016 at 2:00 PM, Michael Brunnbauer <brunni at netestate.de> wrote:
>
> hi all,
>
> On Thu, Mar 31, 2016 at 07:32:21PM +0200, Michael Brunnbauer wrote:
>> Is is possible that is this connected to rndc stats? I will stop doing
>> rndc stats for a while to test (it currently runs every minute).
>
> Not doing rndc stats did not prevent the problem. Any other ideas?
Hi Michael,
Are you doing query logging on this box? If so, you might check for
messages such as:
named[743]: clients-per-query decreased to 17
I know you tried setting max-clients-per-query earlier, but since this
is for a locally-hosted zone, query volume could be quite high
somewhere along the way. Likewise, you might run
rndc status
and see what you get.
Something else you might try: if you don't already, turn on
server-statistics/statistics-channels:
https://kb.isc.org/article/AA-00769/0/Using-BINDs-XML-statistics-channels.html
You may get what you're looking for; you may not.
John
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