Olivier
This is the same error I am getting with the fresh install on RHEL 6.6. If it 
helps I have done the following to try and find the problem:
1.      the data is being passed correctly between nodes and head node.
2.      rrd files are being updated correctly and a graph can be produced from 
the data.
3.      the file /usr/share/ganglia-webfrontend/graph.php is the file that 
display the error message, the particular code is

  // We must have a 'series' value, or this is all for naught
  if (!array_key_exists('series', $rrdtool_graph) ||
      !strlen($rrdtool_graph['series'])) {
    $rrdtool_graph['series'] =
      'HRULE:1#FFCC33:"Empty RRDtool command. Likely bad graph config"';
  }

Regards 
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Richard A. Young
ICT Services
Email: richard.yo...@usq.edu.au   Phone: (07) 46315557   
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-----Original Message-----
From: LAHAYE Olivier [mailto:olivier.lah...@cea.fr] 
Sent: Friday, 16 January 2015 8:37 PM
To: oscar-users@lists.sourceforge.net
Subject: Re: [Oscar-users] Ganglia : Empty RDDtool command. Likely bad graph 
config

I confirm the bug unfortunately. I though that it was my test machine that had 
the problem due to multiple reinstall; your statement proves that I was wrong 
and that this bugs triggers on a fresh install.
The good news is that it's reproductible and thus should be easy to fix.
Unfortunately, it this time I have to time to investigate. Maybe on monday or 
tuesday. In the meantime, if you can figure out the bad config (bad link?) that 
would help me a lot.

Best regards.

Olivier.


-- 
   Olivier LAHAYE
   CEA DRT/LIST/DIR

________________________________

De : Laurent Carrel [laurent.car...@free.fr] Envoyé : vendredi 16 janvier 2015 
11:28 À : oscar-users@lists.sourceforge.net Objet : [Oscar-users] Ganglia : 
Empty RDDtool command. Likely bad graph config


Dear all,

After a clean install on my cluster on a centos 6.8 ,all works fine (1 head and 
28 nodes) except ganglia (3.7).

On each graph, the load of the nodes are shown with the good background color 
but no data are drawed and, at the bottom of the graph, this message is written 
: Empty RRDtool command. Likely bad graph config.

If click on Inspect, no data appear. If i click on JSON, 'null' is written, and 
when i export a cvs, i get a file with only 1 line : 'Timestamp'.

I hope somebody will help me ...

Sincerely

Laurent CARREL


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