Maintained by: NLnet Labs

[Unbound-users] Issues with Unbound 1.4.18

W.C.A. Wijngaards
Fri Aug 31 13:59:37 CEST 2012


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Hi Phil,

On 08/31/2012 01:45 PM, Phil Davies wrote:
> Hi Wouter,
> 
> Thanks for the advice , I've recompiled unbound with debug enabled,
> So I'll wait until the next crash and see if I get any extra
> information. In terms of load these servers are doing about 1400
> queries per second and when they are running handle this with about
> 10-15% CPU.  As for ulimit I haven't changed any defaults.

The default could be small for the data seg size (one Freebsd server
tells me 512M, another 1G).  That could be easily too small for
unbound if you unbound.conf a large cache.  Configuring unbound to use
500 M according to config would use about 1000M in practice (due to
malloc).  Monitor your process size, or check the config file (default
unbound easily fits in the 512Mb default, but then would be a bit
small for the amount of queries per second you get).  I would guess
that you want to use a big chunk of memory of your machine to service
that queryload, multiple GBs, and this does not fit in the default ulimit.

Also, I am interested if unbound prints errors to syslog?  Or the
logfile if you enabled one?

Best regards,
   Wouter
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