( rrdtool 1.0.45 on DEBIAN Linux (Knoppix) 2.4.19 )
Hi Tobi, hi to the rest of this list.
First of all thanks to Tobi for providing rrdtool! I've just started fiddling
around, followed the examples in the tutorial and was thinking i knew what's
going on.....things are never as easy as they seem ;-)
So i started collecting temperature values with a script every two minutes and
tried to graph them:
-----------Script : -------------------------------------------------
#!/bin/bash
PATH=/usr/bin:/bin
TFILE=/mnt/lxwndata/usvsvr_01/temperatures.dat
DBASE=/mnt/lxwndata/temps.rrd
PIC1=/mnt/lxwndata/tmpusv1.png
NOWTIME=`date +%s`
STARTDB=`expr ${NOWTIME} - 10`
STARTGRAPH=`expr ${NOWTIME} - 5400`
if ! test -r ${DBASE}
then
rrdtool create ${DBASE} --start ${STARTDB} DS:temp:GAUGE:240:U:U \
RRA:LAST:0.5:1:60 \
RRA:AVERAGE:0.5:15:24
fi
# Getting the temperature value out of an ascii file:
MTMP=`tail -n1 ${TFILE} | awk 'BEGIN {FS=","}{print $9}' ${LINE}`
# and update rrd database:
rrdtool update ${DBASE} ${NOWTIME}:${MTMP}
# now create the graph
rrdtool graph ${PIC1} --start ${STARTGRAPH} --end ${NOWTIME} --vertical-label
"Temperatur [°C]" \
DEF:mytmp=${DBASE}:temp:LAST LINE2:mytmp:#FF0000:Uhrzeit --title
"Temperatur USV svr_01" \
> /dev/null
---------End of Script------------------------------------------------------
The script is running as CRON job every two minutes. And indeed it does create
a png file with an y axis scale that fits the measured values, but there seems
to be no line graphed, no values plotted. Even if i set the maximum of the y
axis to a value higher than the measured maximum, no line appears.
After the script ran some 15 minutes i executed rrdfetch to see if there's
something in the database:
#> NOWTIME=`date +%s`
#> STARTGRAPH=`expr ${NOWTIME} - 5400`
#> rrdtool fetch ${DBASE} LAST --start ${STARTGRAPH} --end NOWTIME}
1074261300: nan
1074261600: 2.4700000000e+01
1074261900: 2.4700000000e+01
1074262200: 2.4700000000e+01
1074262500: 2.4700000000e+01
1074262800: 2.4700000000e+01
1074263100: 2.4700000000e+01
1074263400: 2.4700000000e+01
1074263700: nan
#>
But still i get a nice png graph, showing the right times at x axis, the right
temperature range at y axis, but no line seems to bee drawn from the values.
I know i am missing something very important, but.....could you give me the
right kick please?
Thanks in advance,
Thorsten
++
Dipl.-Ing.
Thorsten Volkmer-Wolf
IT-Support & Services
AEROTEC Engineering GmbH
Hein-Saß-Weg 38
21129 Hamburg / Germany
fon +49 (0)40/742 198-241
fax +49 (0)40/742 198-111
<http://www.aerotec.de>
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