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

[Victor Mercado]

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',
'DS:Jitter:GAUGE:5000:U:U',
'DS:PacketLossPerc:GAUGE:5000:U:U',
'RRA:AVERAGE:0.5:1:1440',
'RRA:AVERAGE:0.5:1:3600',
'RRA:AVERAGE:0.5:1:1440',
'RRA:AVERAGE:0.5:1:3600')

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,
row[9],row[12]))

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 -->
<row><v>5.3978333333e-01</v><v>0.0000000000e+00</v></row>
<!-- 2014-07-07 15:24:00 EDT / 1404761040 -->
<row><v>4.4520000000e-01</v><v>0.0000000000e+00</v></row>
</database>
</rra>
</rrd>


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?

Victor
​ (rrd-beginner)​
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Post by Victor Mercado
$ 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?
Victor
​ (rrd-beginner)​

You get from RRDtool what you ask for: nothing.

Please work your way through the tutorials.

[Simon Hobson]

Post by Victor Mercado
rrdtool.create('%s' % rrd_input_file, '--start', 'now', '--step', '120',
'DS:Jitter:GAUGE:5000:U:U',
'DS:PacketLossPerc:GAUGE:5000:U:U',
'RRA:AVERAGE:0.5:1:1440',
'RRA:AVERAGE:0.5:1:3600',
'RRA:AVERAGE:0.5:1:1440',
'RRA:AVERAGE:0.5:1:3600')

You have 3 redundant RRAs there - 1440 is a subset of 3600, and they all consolidate the same way (ie nothing as it's one PDP (Primary Data point) per CDP (Consolidated Data Point).

Post by Victor Mercado
$ rrdtool graph -j <rrd filename> > graph.png
Unfortunately, I don't get any output.

You won't because that doesn't tell RRD to produce anything.
See :
http://oss.oetiker.ch/rrdtool/doc/rrdgraph_graph.en.html
http://www.vandenbogaerdt.nl/rrdtool/