[rrd-users] Can't graph anything from populated rrd

Victor Mercado victor.mercado at ahold.com
Mon Jul 7 21:34:18 CEST 2014

Hi all,

I'm unable to plot the data in my rrd db.

I Installed rrdtool and python-rrd for python 2.7 in a Ubuntu 14.04 os
(inside a virtualbox 32-bit machine).  I created a rrd database using
python-rrd with the following syntax:

rrdtool.create('%s' % rrd_input_file, '--start', 'now', '--step', '120',

I update the rrd database using python-rrd with the following syntax:

for row in iperf_input:
    if len(row) == 14:
          epoch = str(time.mktime(time.strptime(row[0], "%Y%m%d%H%M%S")))
           rrdtool.update('%s' % rrd_input_file, '%s:%s:%s' %(epoch,

If I execute "rrdtool dump <rrd filename>" in a terminal window, I can see
the data.  The following is an example of the output:

<!-- 2014-07-07 15:22:00 EDT / 1404760920 -->
<!-- 2014-07-07 15:24:00 EDT / 1404761040 -->

Unfortunately, I'm unable to graph the data.  I'm trying to create a simple
graph without any optional parameters just to see something.  The syntax is
a follows:

$ rrdtool graph -j <rrd filename> > graph.png

Unfortunately, I don't get any output.

I would like to see a graph of my 2 metrics (Jitter and PacketLossPerc) and
the two predefined averages for each of the metrics. Can someone help?

​ (rrd-beginner)​

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