[CentOS] DNS lookup delay with centos & postfix
Robert Spangler
mlists at zoominternet.net
Thu Jul 26 22:14:42 UTC 2012
On Wednesday 25 July 2012 17:47, the following was written:
> I used dig from the email svr command line with the primary DNS svr up
> and (naturally) it pulled from there as normal. Then I downed the
> primary DNS svr, saw the nagios check fail and tried again. The same
> dig lookup was actually faster and pulled from the secondary DNS svr
> just fine. And, again, the nagios alert cleared as soon as the primary
> DNS svr was back online.
I believe the reason you noticed a faster response is because the second query
used the cached information from the first look-up not because the second
server is/was faster.
to verify this look at the TTL times in the response.
--
Regards
Robert
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