[Pdns-users] ddns performance of pdns

ktm at rice.edu ktm at rice.edu
Thu Feb 25 13:54:26 UTC 2016

On Thu, Feb 25, 2016 at 12:01:19PM +0100, Thomas Mieslinger wrote:
> Hi,
> today I wanted to migrate my ddns master from bind to pdns. 3 DHCP
> Servers sent a about 50 updates per second to the pdns 3.4.8 and
> only one or two updates per second could be successfully commited to
> the database.
> All failed transactions rolled back after trying to edit the SOA record.
> I'm using 5.1.73-log MySQL Community Server.
> I'm using REPEATABLE-READ transaction-isolation and
> distributor-threads=2
> receiver-threads=10
> as pdns performance settings.
> I tried to disable SOA-EDITs with domainmetadata
> SOA-EDIT             | NONE
> but that didn't change anything.
> What DDNS performance do you get from your pdns instances with which
> settings?
> Thanks Thomas

Hi Thomas,

You will need to investigate your DB performance. Turn on query logging
and slow query logging. Also check system I/O stats to see if you have
a bottleneck there. We are just getting started on adding a DDNS component
to our network so I do not have any firsthand experience with it and the
queries it uses. Good luck in your hunt for the bottleneck.


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