[rrd-users] Re: weird update values from cron

Serge Maandag serge.maandag at staff.zeelandnet.nl
Mon Nov 21 15:40:19 MET 2005

> my values in my RRD looks correct and drawing the graph seems perfect:
> 1132578600: 5.5507237333e+03 9.1437223333e+02
> but When I run this same script via cron, (did a test that the path is
> correct) my values seems to be in bytes when drawing the graph:
> 1132578000: 6.7956503333e+02 0.0000000000e+00

Troubles with cron relate to missing paths in 99% of all cases.
Be sure to have each file and each binary addressed with a full path
Both in your script and in your crontab.

To debug, you should know what the script outputs when run from cron.
To do so, add a:

echo $TIMESTAMP:$TRAFFIC >> /tmp/logfile.txt

to your script. Or just


so it outputs to stdout. In addition add a MAILTO='you at address.net'
the updaten.sh line in cron to have the output of your script sent to


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