[collectd] Not seeing postgres data from collectd.

Sebastian Harl sh at tokkee.org
Wed Mar 10 08:45:05 CET 2010

Hi James,

On Tue, Mar 09, 2010 at 03:36:31PM -0800, James Armstrong wrote:
> Sebastian Harl wrote:
> > On Tue, Mar 09, 2010 at 01:51:24PM -0800, James Armstrong wrote:
> >> Sebastian Harl wrote:
> >> One possibility, this query takes a while to return, over 30 seconds.
> >> Could it be timing out, and if so, how can I change the timeout for this
> >> query without changing other intervals?

> > I would not expect the query to time out (it runs fine from an
> > interactive client, which should basically be the same). However, it
> > will cause RRDtool to generate an empty graph. Do you use the rrdtool
> > plugin? Did you really make sure that *no* data at all arrives at the
> > server? Does collectd create any RRD files at all ($hostname/ 
> > postgresql-dwh/counter-eventcount.rrd)? Is there any data in that file
> > (run 'rrdtool fetch path/to/counter-eventcount.rrd MAX')? Did you try to
> > store the collected data on the client as well? Does that work fine?
> Yes, we use rrdtool.  No data was arriving at the remote machine (none
> was in the UDP packet I captured with tcpdump.)  So, I enabled rrdtool
> on the local machine -- no data was being captured there, either.

For how long did you capture packets? If there query takes over 30
seconds, you'd, obviously, have to capture for at least that amount of

Your server does receive and collect the other data, right?

On your local machine, are there any files in /var/lib/collectd/rrd/

Are there any other files in /var/lib/collectd/rrd/ (on the local

Btw., if the query would time out, you should get a warning / error
message in the logs.

Are there *any* messages related to postgresql in the log file?
grep -Fi postgresql /var/log/collectd.log

> Here's the complete /etc/collectd.conf file (with IP's and passwords
> changed for all the obvious reasons!) in case there are conflicts:

That config looks fine to me.

Sorry for being a bit in the dark and possibly asking stupid questions,
but I could not reproduce that behavior so far (I'll see if I can find
some query that takes such a long time) and your setup looks fine to me.


Sebastian "tokkee" Harl +++ GnuPG-ID: 0x8501C7FC +++ http://tokkee.org/

Those who would give up Essential Liberty to purchase a little Temporary
Safety, deserve neither Liberty nor Safety.         -- Benjamin Franklin

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