[Pdns-users] Per-record packet cache override

Dan Campbell pdns at w3eta.net
Thu Aug 29 16:12:17 UTC 2013

I implemented a custom geoip backend using the pipebackend and I completely disabled packet caching with no ill effects.  
Dan Campbell

On Aug 28, 2013, at 6:51 PM, Jonathan Thorpe <jthorpe at Conexim.com.au> wrote:

> Hi All,
> I have been looking at implementing the GeoIP backend for PowerDNS and noticed that in order to be effective, the packet and query cache needs to be disabled. I have a few ideas for other custom back-ends that I'd like to explore as well, all of which rely on unique responses for each request.
> If I'm not mistaken, there are currently two ways to achieve this:
> 1. Disable packet caching all together.
> 2. Run a separate instance of PowerDNS.
> The first option probably isn't a good idea for this particular implementation as we appear to get a fairly good hit rate with the packet cache and the DNS servers are otherwise very busy. The second option is fine, but because you can't implement a CNAME on the zone apex, it represents a challenge for us.
> Are there any other options people employ to overcome this?
> What I'd ideally like to do is somehow signal to the packet cache not to attempt to cache specific records so that they're retrieved fresh each time. Is there a mechanism in PowerDNS that exists to do this?
> Kind Regards,
> Jonathan
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