[rrd-users] graph question

s pascal segar.pascal at gmail.com
Sat Nov 21 04:27:04 CET 2015

Hi ,

i have this code to create the graph file

rrdtool graph /var/www/temp_graph.png \
-w 1024 -h 400 -a PNG --slope-mode \
--start -1d --end now \
--vertical-label "temperature (C)" \
DEF:out=/opt/templog/data/templog.rrd:internal:AVERAGE \
DEF:in=/opt/templog/data/templog.rrd:external:AVERAGE \
LINE2:in#00ff00:"inside" \

And this file to create the rrd file:

rrdtool create /opt/templog/data/templog.rrd --step 300   \
DS:internal:GAUGE:600:-55:125  \
DS:external:GAUGE:600:-55:125  \
RRA:AVERAGE:0.5:1:576    \
RRA:AVERAGE:0.5:3:1344   \
RRA:AVERAGE:0.5:12:1488  \
RRA:AVERAGE:0.5:72:1984  \
RRA:MIN:0.5:72:1984      \

But when i create the graph, the temperature curve shows only positive
temperature and not negative temperature.

When the temperature is going under 0 C, the curve is blank then become
visible when temperature is positive.

How can i resolve this problem?

Thank you
Best Regards
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