[dns-operations] Forcing BIND to randomly expire records from cache ahead of time

Chuck Aurora chucka at isc.org
Thu Jul 3 22:13:53 UTC 2014

On 07/03/2014 04:06 PM, Mark Pettit wrote:
> I have an issue with BIND cache timeouts, and I was hoping
> someone else might have some idea how to fix this.
> Here's the situation: we have a large number of servers that do
> a huge number of DNS lookups at the top of every minute. The TTL
> for the records they're looking up is 3600.
> What we've noticed is that on a host with a recently-restarted
> copy of BIND, we see huge spikes in DNS latency every 61 minutes.
> This makes logical sense, given the behavior of the DNS lookups.

BIND 9.10 has a new prefetch feature which might help?



> Does BIND have a config option like this? Has anyone else ever 
> encountered this issue, and if so, how did you address it?
    Chuck Aurora : ISC Software Support : chucka at isc.org
    Internet Systems Consortium, Inc.

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