[Pdns-users] Slave AXFR not working 100% at high rates
Tom van Leeuwen
tom.van.leeuwen at saasplaza.com
Thu Jul 18 12:27:43 UTC 2013
Probably same issues as in this very old post, never answered though:
I'm also taking the same subject.
I've been running pdns in my company for a few years now and have been a
We have 1 pdns server running which is MASTER for all zonesthat we have.
For 724 domains that we have, I have added 2 new pdns servers (going
from 8 to 10 pdns nameservers). Via a batch script I inserted a total of
2*724 NS records to add those new pdns servers. The script was done
adding those records before the pdns MASTER noticed the serial updates,
so for all those 724 domains it started generating notifications in one
After some time things calm down in /var/log/syslog and I assume pdns is
done with all its transfers.
When doing a count of domains and records on the pdns servers that
should have the same database contents, I get the following results:
pdns01 724 40783
pdns02 724 40783
pdns03 724 40784
pdns04 724 40297
pdns05 724 39701
pdns06 724 40777
pdns07 724 40781
pdns08 724 40783
pdns09 19 359
pdns10 317 12566
pdns09 and pdns10 are the new nameservers.
I've been walking into this issue a lot a and even have a script to
workaround this issue.
I have a script that will notify each pdns server for every domain that
it is authorative for. After each notification it will sleep for 0.1
seconds. This is the workaround and will fix the issues. If I run it for
pdns09 724 40784
So, should I increment threads on my MASTER?
I am running the following on my SUPERMASTER:
$ dpkg --list | grep pdns
ii pdns-backend-mysql 3.0-1.1ubuntu1 generic MySQL
backend for PowerDNS
ii pdns-server 3.0-1.1ubuntu1 extremely powerful
and versatile nameserver
$ pdns_control version
$ lsb_release -rd
Description: Ubuntu 12.04.2 LTS
With the following configuration:
pdns09: runs the same OS + Package version.
Does anybody know if I can fix the issues I'm having? Or that I'm just
asking too much of my setup and should pipe it down a bit. I understand
that 10*724 zone transfers at once may simply ask way too much from pdns...
Tom van leeuwen
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