[Pdns-users] [dnsdist] Dnsdist not reading from the cache

SAMI RAHAL Sami.Rahal at topnetpro.tn
Mon Sep 12 12:25:17 UTC 2022

Hello Remi

yes it's weird, because in the web interface it says that the cache is working, here is my configuration

-- == Generic Configuration ==
-- https://dnsdist.org/guides/console.html
-- setKey("please generate a fresh private key with makeKey()")

-----------------  Mes serveurs ------------------------
newServer({name="unbound",pool="resolverTopnet", address="IPserver1", qps=2000, order=1})
newServer({name="pdns-recursor",pool="resolverTopnet", address="IPserver2", order=2})

-------------------------------------------------------cache -----------------------
setPoolServerPolicy(leastOutstanding, "resolverTopnet")
pc = newPacketCache(2000000, {maxTTL=43200, minTTL=0,temporaryFailureTTL=60, staleTTL=60, dontAge=false})
addAction(AllRule(), PoolAction("resolverTopnet"))
-----------------------------------------------Begin security rule ------------------------------------------
local dbr = dynBlockRulesGroup()
dbr:setQueryRate(250, 10, "Exceeded query rate", 20)
dbr:setRCodeRate(DNSRCode.NXDOMAIN, 20, 10, "Exceeded NXD rate", 60)
dbr:setRCodeRate(DNSRCode.SERVFAIL, 20, 10, "Exceeded ServFail rate", 60)
dbr:setQTypeRate(DNSQType.ANY, 5, 10, "Exceeded ANY rate", 180)
--dbr:setResponseByteRate(1000, 10, "Exceeded resp BW rate", 60)

function maintenance()
addAction(MaxQPSIPRule(100), DropAction())
addAction(MaxQPSIPRule(50, 24, 64), DropAction())
addAction({"nl.", "be."}, QPSAction(1))
---------------------------------------------------End security rule--------------------------


De : Pdns-users <pdns-users-bounces at mailman.powerdns.com> de la part de pdns-users-request at mailman.powerdns.com <pdns-users-request at mailman.powerdns.com>
Envoyé : lundi 12 septembre 2022 14:00
À : pdns-users at mailman.powerdns.com
Objet : [EXTERNE]Pdns-users Digest, Vol 236, Issue 9

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Today's Topics:

   1. Re: [dnsdist] Dnsdist not reading from the cache (Remi Gacogne)


Message: 1
Date: Mon, 12 Sep 2022 10:19:19 +0200
From: Remi Gacogne <remi.gacogne at powerdns.com>
To: "pdns-users at mailman.powerdns.com"
        <pdns-users at mailman.powerdns.com>
Subject: Re: [Pdns-users] [dnsdist] Dnsdist not reading from the cache
Message-ID: <103ecf7b-b663-78ff-7be1-3a3b41a34f3c at powerdns.com>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

On 09/09/2022 17:38, SAMI RAHAL via Pdns-users wrote:
> The server is in production it receives requests as shown in this summary
> Uptime: 17 days, Number of queries: 2326402346 (2385.00 qps), ACL drops:
> 0, Dynamic drops: 27076173, Rule drops: 6451838
> Average response time: 9.40 ms, CPU Usage: 26.50%, Cache hitrate:
> 85.37%, Server selection policy: leastOutstanding
> Listening on:, ACL:

The cache hitrate information from that output indicates that the cache
is working.
If you still think this is not the case, please share an unedited
configuration that we can use to reproduce the issue, and what you do
exactly to test whether the cache is working.

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

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