Hello Ken,
On 20 Jul 2017, at 16:37, Kenneth Marshall wrote:
I am currently running pdns-recursor version 3.7.4 and am trying to
disable caching for a single forwarded domain. I am current trying
to use the following lua script but although being called, the
setvariable() call does not seem to turn off the caching. I would
expect each call to hit the DNS servers for the forwarded zone:
------------------nocache.lua
function endswith(s, send)
return #s >= #send and s:find(send, #s-#send+1, true) and
true or false
end
function preresolve( remoteip, domain, qtype )
if endswith(domain, ".ad.rice.edu.")
then
if qtype ~= pdns.A
then
return pdns.PASS, {}
end
pdnslog("preresolve called for: "..domain, pdns.loglevels.Info)
setvariable()
end
return pdns.PASS, {}
end
------------------nocache.lua
Is this possible? I have tried the same with a postresolve() function
but it still appears to cache based on the TTL.
setvariable() and anything you do to TTLs will only affect the packet
cache, not the cache for responses from other servers.
Is this a forward or a forward-recurse? If the latter, you could do this
in dnsdist. If the former, you could do this with dnsdist and an
-additional- recursor.
Kind regards,
--
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/
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