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RedHat 9 (Linux i386) - man page for upssched (redhat section 8)

UPSSCHED(8)			     Network UPS Tools (NUT)			      UPSSCHED(8)

NAME
       upssched - Timer helper for scheduling events from upsmon

SYNOPSIS
       upssched

NOTE
       upssched should be run from upsmon(8) via the NOTIFYCMD.  You should never run it directly
       during normal operations.

DESCRIPTION
       upssched was created to allow users to execute programs at times relative to events  being
       monitored  by  upsmon(8).  The original purpose was to allow for a shutdown to occur after
       some fixed period on battery, but there are other uses that are possible.

INTEGRATION
       upssched needs to be called as the NOTIFYCMD in your upsmon.conf(5).  It  determines  what
       is  happening based on the UPSNAME and NOTIFYTYPE environment variables.  You should never
       have to deal with them directly.

       Set the EXEC flag on the events that you want to see in upssched.  For  example,  to  make
       sure  that  upssched  hears  about ONLINE, ONBATT and LOWBATT events, the flags would look
       like this:

		   NOTIFYFLAG ONLINE EXEC
		   NOTIFYFLAG ONBATT EXEC
		   NOTIFYFLAG LOWBATT EXEC

       If you also want to continue writing to the syslog, just add it in:

		   NOTIFYFLAG ONLINE SYSLOG+EXEC
		   NOTIFYFLAG ONBATT SYSLOG+EXEC
		   NOTIFYFLAG LOWBATT SYSLOG+EXEC

       For a full list of notify flags, see the upsmon(8) documentation.

CONFIGURATION
       See upssched.conf(5) for information on configuring this program.

EARLY SHUTDOWNS
       To shut down the system early, define a timer that starts  due  to  an  ONBATT  condition.
       When  it  triggers,  make  your CMDSCRIPT call your shutdown routine.  It should finish by
       calling "upsmon -c fsd" so that upsmon gets to shut down the slaves in a  controlled  man-
       ner.

       Be sure you cancel the timer if power returns (ONLINE).

DEBOUNCING EVENTS
       If  your  UPS  goes  on and off battery frequently, you can use this program to reduce the
       number of pager messages that are sent out.   Rather  than  sending  pages  directly  from
       upsmon(8),  use	a short timer here.  If the timer triggers with the UPS still on battery,
       then send the page.  If the power returns before then, the timer can be cancelled  and  no
       page is necessary.

BACKGROUND
       This program was written primarily to fulfill the requests of users for the early shutdown
       scenario.  The "outboard" design of the program	(relative  to  upsmon)	was  intended  to
       reduce the load on the average system.  Most people don't have the requirement of shutting
       down after n seconds on battery, since the usual OB+LB testing is sufficient.

       This program was created separately so those people don't have to spend CPU time  and  RAM
       on something that will never be used in their environments.

       The  design  of	the timer handler is also geared towards minimizing impact.  It will come
       and go from the process list as necessary.  When a new timer is started, a process will be
       forked to actually watch the clock and eventually start the CMDSCRIPT.  When a timer trig-
       gers, it is removed from the queue.  Cancelling a timer	will  also  remove  it	from  the
       queue.  When no timers are present in the queue, the background process exits.

       This means that you will only see upssched running when one of two things is happening:

       - There's a timer of some sort currently running

       - upsmon just called it, and you managed to catch the brief instance

       The  final optimization handles the possibility of trying to cancel a timer when there are
       none running.  If the timer daemon isn't running, there are no timers to cancel, and  fur-
       thermore  there	is  no	need  to start a clock-watcher.  So, it skips that step and exits
       sooner.

FILES
       upssched.conf(5)

SEE ALSO
       upsmon(8)

   Internet resources:
       The NUT (Network UPS Tools) home page: http://www.exploits.org/nut/

       NUT mailing list archives and information: http://lists.exploits.org/

					 Wed Feb  6 2002			      UPSSCHED(8)


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