David Tonhofer, m-plify S.A. wrote:
--On Tuesday, March 28, 2006 11:59 PM +0800 mcclnx mcc
<mcclnx@xxxxxxxxxxxx> wrote:
I have been test Daylight saving time on REDHAT AS
3.6. All cron jobs between 2:00 A.M. to 3:00 A.M.
will not execute.
We also have SUN Solaris servers, but SUN understand
it and will execute cron jobs .
Does anyone know how to make it run on Redhat LINUX
system?
which file control Time ZOne setup?
Thanks.
Is'nt it normal that the cronjobs won't execute? After
all, the time interval is missing.
The cron log:
Mar 26 01:55:01 yui crond[29681]
Mar 26 01:59:01 yui crond[30949]
Mar 26 01:59:01 yui crond[30950]
Mar 26 03:00:01 yui crond[31249] <-- works
Mar 26 03:00:01 yui crond[31254]
Mar 26 03:00:01 yui crond[31255]
Using anacron would probabyl fix this.
This old message may help more. I had some problems with timezoning
in RH ES 4.0, and:
There is a new file "/etc/timezone" which contains the name
of the timezone selected during install ("Europe/Luxembourg")
The file that has been traditionally there "/etc/localtime",
which should contain a copy of the TimeZone structure dump
in /usr/share/zoneinfo/Europe/Luxembourg, was missing.
I copied /usr/share/zoneinfo/Europe/Luxembourg into /etc/localtime
and all was well.
from the "man 5 crontab" pages:
"Commands are executed by cron(8) when the
minute, hour, and month of year fields match
the current time, and when at least one of
the two day fields (day of month, or day of week)
match the current time (...). Note that this
means that non-existant times, such as
"missing hours" during daylight savings
conversion, will never match, causing jobs
scheduled during the "missing times"
not to be run. Similarly, times that occur
more than once (again, during daylight savings
conversion) will cause matching jobs to
be run twice."
Depending on what your system is used for, if you want to avoid "missing
times" or duplicate times, you could copy one of the timezone files from
/usr/share/zoneinfo/Etc/ to /etc/localtime, as they don't use daylight
savings.
Alternatively, reschedule your cronjobs to avoid running during daylight
savings conversions. Or mark your calendar to reschedule them just for
the nights the conversions take place.
Kind regards,
Herta
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