Bug#703149: [RRD ERROR] Unable to graph /group/node.domain.tld/load-month.png : Could not save png to '/group/node.domain.tld/load-month.png'

[Christoph Biedl]

forwarded 703149 http://munin-monitoring.org/ticket/1289
thanks

Raoul Bhatia wrote...

> I have configured 10 nodes belonging to one group via
> /etc/munin/munin-conf.d/group
> 
> In the logs, i see
> >2013/03/16 06:31:21 asked for (group, node.domain.tld, load, month) 
> >2013/03/16 06:31:21 [PERL WARNING] Use of uninitialized value $cgi_tmp_dir 
> >in concatenation (.) or string at /usr/share/munin/munin-graph line 243, 
> ><GEN3> line 1258.
> >2013/03/16 06:31:21 Starting munin-graph
> >2013/03/16 06:31:21 [INFO] Looking into drawing 
> >/group/node.domain.tld/load-month.png
> >2013/03/16 06:31:21 [RRD ERROR] Unable to graph 
> >/group/node.domain.tld/load-month.png : Could not save png to 
> >'/group/node.domain.tld/load-month.png'

This so very much looks like the upstream bug mentioned above I took
the liberty to link to it. Unless I'm mistaken, the actual reason for
your trouble is after adding more nodes, munin-graph needs too much
time to run, more than about 300 seconds, resulting in the trouble you
see above.

Workarounds (quoting munin#1289):

| * Apply the patch from #1394 that will quarter the run-time of
|   munin-graph most of the time.
| * Switch to CGI based graphing. 

Regards,

    Christoph

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