139 lines
5.3 KiB
Groff
139 lines
5.3 KiB
Groff
'\" t
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.\" Title: upssched
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.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
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.\" Date: 08/07/2012
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.\" Manual: NUT Manual
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.\" Source: Network UPS Tools
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.\" Language: English
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.\"
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.TH "UPSSCHED" "8" "08/07/2012" "Network UPS Tools" "NUT Manual"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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upssched \- Timer helper for scheduling events from upsmon
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.SH "SYNOPSIS"
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.sp
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\fBupssched\fR
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.if n \{\
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.sp
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.\}
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.RS 4
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.it 1 an-trap
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.nr an-no-space-flag 1
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.nr an-break-flag 1
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.br
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.ps +1
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\fBNote\fR
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.ps -1
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.br
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.sp
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\fBupssched\fR should be run from \fBupsmon\fR(8) via the NOTIFYCMD\&. You should never run it directly during normal operations\&.
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.sp .5v
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.RE
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.SH "DESCRIPTION"
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.sp
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\fBupssched\fR was created to allow users to execute programs at times relative to events being monitored by \fBupsmon\fR(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\&.
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.SH "INTEGRATION"
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.sp
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upssched needs to be called as the NOTIFYCMD in your \fBupsmon.conf\fR(5)\&. It determines what is happening based on the UPSNAME and NOTIFYTYPE environment variables\&. You should never have to deal with them directly\&.
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.sp
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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:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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NOTIFYFLAG ONLINE EXEC
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NOTIFYFLAG ONBATT EXEC
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NOTIFYFLAG LOWBATT EXEC
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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If you also want to continue writing to the syslog, just add it in:
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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NOTIFYFLAG ONLINE SYSLOG+EXEC
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NOTIFYFLAG ONBATT SYSLOG+EXEC
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NOTIFYFLAG LOWBATT SYSLOG+EXEC
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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For a full list of notify flags, see the \fBupsmon\fR(8) documentation\&.
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.SH "CONFIGURATION"
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.sp
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See \fBupssched.conf\fR(5) for information on configuring this program\&.
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.SH "EARLY SHUTDOWNS"
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.sp
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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 manner\&.
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.sp
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Be sure you cancel the timer if power returns (ONLINE)\&.
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.SH "DEBOUNCING EVENTS"
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.sp
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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 \fBupsmon\fR(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\&.
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.SH "BACKGROUND"
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.sp
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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\(cqt have the requirement of shutting down after \fIN\fR seconds on battery, since the usual OB+LB testing is sufficient\&.
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.sp
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This program was created separately so those people don\(cqt have to spend CPU time and RAM on something that will never be used in their environments\&.
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.sp
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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 triggers, 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\&.
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.sp
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This means that you will only see upssched running when one of two things is happening:
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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There\(cqs a timer of some sort currently running
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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upsmon just called it, and you managed to catch the brief instance
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.RE
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.sp
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The final optimization handles the possibility of trying to cancel a timer when there are none running\&. If the timer daemon isn\(cqt running, there are no timers to cancel, and furthermore there is no need to start a clock\-watcher\&. So, it skips that step and exits sooner\&.
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.SH "FILES"
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.sp
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\fBupssched.conf\fR(5)
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.SH "SEE ALSO"
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.sp
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\fBupsmon\fR(8)
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.SS "Internet resources:"
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.sp
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The NUT (Network UPS Tools) home page: http://www\&.networkupstools\&.org/
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