[rrd-users] Strange behavior with rddtool update with crontab

alix-r r.ty at rbty.de
Fri Oct 24 10:15:20 CEST 2008


I'm facing a strange behavior with a Bash script executed by CRONTAB.
The script works fine if I run it from the command line directly. However,
if I try to run  it time controlled by CRONTAB , I'm getting the following

ERROR: temps.rrd: expected 3 data source readings (got 3) from N

If I list the RRD-DB temps.rrd by 

rrdtool fetch temps.rrd AVERAGE --start N-1000 --end N<

I can see that the organization  (just 2 values per entry) is correct.

                       rob_raum           rob_hzvor

1224742800: nan nan
1224742860: nan nan
1224742920: 3.9680094819e+01 2.3062500000e+01
1224742980: 3.9695577221e+01 2.3062500000e+01
1224743040: 3.9577488868e+01 2.3062500000e+01
1224743100: 3.9222938007e+01 2.3062500000e+01
1224743160: 3.9664530825e+01 2.3062500000e+01
1224743220: nan nan
1224743280: nan nan

Again, the script works correctly  executed via the command line. The 
valid values above are entered that way. By CRONTAB execution, I do 
not get entries due to the error.

Any idea what's wrong ?
(I'm new with RRDTOOLS and LINUX, hopefully the question is not stupid)


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