[dnsdist] force backend lookup for specific query name

[Remi Gacogne]

On 6/26/21 8:09 AM, Eldon Koyle via dnsdist wrote:
>> Is there any “easy” way to basically disable the packetcache for
>> specific query names (ideally wildcarding the domain part of it),
>> so it always causes a query to the backend/upstream servers?
>> 
> 
> I'm not sure if this is the best way, but you could create another 
> pool (https://dnsdist.org/guides/serverpools.html) with the same 
> upstream servers but without a packetcache, then add a rule like the 
> following (this is untested):
> 
> addAction(RE2Rule("_acme-challenge\..*"),
> PoolAction("uncached_pool"))
> 

Or use SkipCacheAction [1].

[1]: https://dnsdist.org/rules-actions.html?#SetSkipCacheAction

-- 
Remi Gacogne
PowerDNS.COM BV - https://www.powerdns.com/