11-03-2014
Disabling cron after NIM restore
Hi Guys,
We normally have a backup and restore nightly on our Prod machines. We do this via customized script and all unattended. The dilemma that I'm having is the disabling of the cron after the restore.
I created a nim script to disable the cron after the restore has been completed. But some of the cron jobs in our Prod that runs every minute can get sneaked out and will sometimes run. The reason for this is that there's a 1 to 2 mins gap once the restore has completed which enables cron normally, and when the nim script to disable cron gets executed.
Is there a way to disable cron even before the restore gets completed? Or is this even possible?
I haven't used fb_script and CUSTOMIZATION_FILE on NIM yet. Not sure if this is the answer to my problem.
Any advise is greatly appreciated.
Regards,
Kaelu
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CRON(8) System Manager's Manual CRON(8)
NAME
cron - clock daemon
SYNOPSIS
auth/cron [-c]
DESCRIPTION
Cron executes commands at specified dates and times according to instructions in the files /cron/user/cron. It runs only on an authentica-
tion server. Option -c causes cron to create /cron/user and /cron/user/cron for the current user; it can be run from any Plan 9 machine.
Blank lines and lines beginning with # in these files are ignored. Entries are lines with fields
minute hour day month weekday host command
Command is a string, which may contain spaces, that is passed to an rc(1) running on host for execution. The first five fields are integer
patterns for
minute 0-59
hour 0-23
day of month 1-31
month of year 1-12
day of week 0-6; 0=Sunday
The syntax for these patterns is
time : '*'
| range
range : number
| number '-' number
| range ',' range
Each number must be in the appropriate range. Hyphens specify inclusive ranges of valid times; commas specify lists of valid time ranges.
To run the job, cron calls host and authenticates remote execution, equivalent to running rx host command (see con(1)). The user's profile
is run with $service set to rx.
Cron is not a reliable service. It skips commands if it cannot reach host within two minutes, or if the cron daemon is not running at the
appropriate time.
EXAMPLES
Here is the job that mails system news.
% cat /cron/upas/cron
# send system news
15 8-17, 21 *** helix /mail/lib/mailnews
%
SOURCE
/sys/src/cmd/auth/cron.c
SEE ALSO
con(1), rc(1)
CRON(8)