[CentOS] cron.hourly runs twice

Michael Schumacher michael.schumacher at pamas.de
Wed Mar 17 12:59:56 UTC 2010


On Wednesday, March 17, 2010 you wrote:

>>> For some reason I cannot fathom,
>>> cron.hourly runs twice each hour
>>> on one of my two CentOS-5.4 systems,

Here comes a very weird idea. I don't know the internals of the
cron-daemon good enough to know if this can actually happen.
If you have a NTP-job every hour started by cron that corrects the
internal time and if your internal clock runs too fast, the system
time may be reset every hour so that the cron-job will start twice. As
I said, I don't know if cron-daemon has a mechanism that would avoid
that problem.

best regards
Michael Schumacher
PAMAS Partikelmess- und Analysesysteme GmbH
Dieselstr.10, D-71277 Rutesheim
Tel +49-7152-99630
Fax +49-7152-996333
Geschäftsführer: Gerhard Schreck
Handelsregister B Stuttgart HRB 252024

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