Howdy,
I'm seeing an issue with tcp queries on powerdns recursor 3.2. We run
two instances of pdns recursor on an internal network and it's mainly hit
by lots of qmail delivery servers. They are doing a ton of lookups, I
think we peak around 4000 queries/second. With more people using
dnssec, many providers returning insanely huge lists of mxers, and qmail's
propensity for "any" queries, we're finding that our tcp queries are going
way up.
What we are seeing is that when "max-tcp-clients" is exceeded, it appears
that pdns is not properly closing sockets. We then get a pile-up of
qmail-remotes that are "stuck" and deliveries stop until pdns is
restarted. netstat shows the connections in state "CLOSED".
We're running FreeBSD 8.1 on all the hosts involved. This mailing list
post is interesting, and explains why these "CLOSED" sockets are in that
state:
http://lists.freebsd.org/pipermail/freebsd-net/2008-June/018544.html
Any pointers on how to troubleshoot this further?
Thanks,
Charles
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