[Pdns-users] Constantly increasing memory usage

BH lists at blackhat.bz
Mon Oct 17 15:44:43 UTC 2011

Hi Preslav,

I run over 120,000 domains from a mySQL database and my memory usage
averages about 200mb.

Are you able to paste your config (redact the sensitive parts such as
database details)? It would help to see the exact config thats running.
Have you had a look at the syslogs to see if any errors are being
reported there? Are you able to also paste the output of "pdns_control

It might be worth upgrading to the latest release (version 3) now too if
thats possible.


On 17/10/2011 11:40 PM, admin at cu.cc wrote:
> Hello,
> I am not sure is this is the right email to contact, but here is my issue:
> We are using power dns 2.9.21 (We had that installed for us, so I am not
> 100% sure if this is really the exact version, is there a way to
> check?). The installation is myslq backended running on centos-5-x86_64
> VPS. We are offering a free domain registration and have more that 20
> 000 domains for which provide free DNS services. The problem is that in
> the last few weeks when the server is started its ram would constantly
> increase until it reached 10GB and our VPS crashed. Once we run the
> command /etc/init.d/pdns restart the ram of the VPS gets back to normal
> levels of 700-1000 MB. This was happening every 2-3 hours yesterday and
> we were forced to set a cronjob that would restart pdns every hour to
> avoid server downtime, but it is not a permanent resolution. I have read
> in forums people discussing that this is a bug which is caused by failed
> MySQL connections that are not completely closed and gather with the
> time and little by little consume the whole server memory. This was
> mainly noticed on configurations with less traffic. The difference with
> us however is that we have around 10K visitors per day on our main site
> only, so I am not sure if the problem is identical.
> Please advise how to resolve this issue.
> Best regards,
> Preslav
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> Pdns-users at mailman.powerdns.com
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