Tuning Bind9?

Dave Lugo dlugo at etherboy.com
Fri Jan 28 17:41:40 UTC 2005

fredrik.pettai at vattenfall.com wrote:
> Hello!
> We have bind 9(.2.x) on Solaris, since it's multithreaded and support =
> incremental updates.
> However, then we do _big_ zone-transfers of a hole zone (for example =
> RBL-zones), the name-resulotion (queries) becomes really slow, and those =
> zone-transfers can take a long time if you need to transfer the hole =
> zone.
> As i can see, there is only 4 threads working on the server but only =
> about 20% of cpu-usage totally during the heavy zone-tranfers (and no =
> other bottlenecks in the systemem that i can see...)
> Is it possible to trim bind so it have a chance to answer the queries =
> faster then a _big_ zone-transfer is in progress? I searched for ways of =
> increasing the the threads, but i found nothing. I've checked the =
> disk/mem/network connection of the machine and those things seems to be =
> quite enought. So i don't think it's a limit of the machine that makes =
> this "slowniness" during the _big_ zone-transfers...
> I didn't find any useful parameters to add i the configuration-file =
> either.
> Has someone else had this problem? and solved it?
> Regards,

I had similar problems.  I solved them using rbldnsd as the backend for 
DNSBL zones, with named in front of it.

Dave Lugo   dlugo at etherboy.com    LC Unit #260   TINLC
Have you hugged your firewall today?   No spam, thanks.
Are you the police?  . . . .  No ma'am, we're sysadmins.

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