UPSSCHED.CONF(5) NUT Manual UPSSCHED.CONF(5)

upssched.conf - Configuration for upssched timer program

This file controls the operations of upssched(8), the timer-based helper program for upsmon(8).

•Contents of this file should be pure ASCII (character codes not in range would be ignored with a warning message).
•Command execution is synchronous (with the called tool process in case of EXECUTE directive, or with the timer process). Consider using your system shell abilities like & to send long-duration handling to the background and let upssched timer daemon continue. This should not impact upsmon daemon, which handles each notification in a separate sub-process (and so not a problem for immediate EXECUTE events).

DEBUG_MIN number

Optional. Specify minimal debugging level for upssched daemon or client, e.g. for troubleshooting a deployment without a need to edit consumer configuration.

Note that command-line option -D can only increase this verbosity level.

Also note that the configuration file is processed line by line, so you may want to set this option early on.

Example:

DEBUG_MIN 6

CMDSCRIPT scriptname

Required. This must be above any AT lines. This script is used to invoke commands when your timers are triggered. It receives a single argument which is the name of the timer that caused it to trigger.

PIPEFN filename

Required. This sets the file name of the socket which will be used for interprocess communications. This should be in a directory where normal users can’t create the file, due to the possibility of symlinking and other evil.

Caution
If you are running Solaris or similar, the permissions that upssched sets on this file are not enough to keep you safe. If your OS ignores the permissions on a FIFO, then you MUST put this in a protected directory!

Note
By default, upsmon(8) will run upssched as whatever user you have defined with RUN_AS_USER; in upsmon.conf(5). Make sure that user can create files and write to files in the path you use for PIPEFN and LOCKFN.
My recommendation: create a special directory for upssched, make it owned by your upsmon user, then use it for both.

The stock version of the upssched.conf ships with PIPEFN disabled to make you visit this portion of the documentation and think about how your system works before potentially opening a security hole.

LOCKFN filename

Required. upssched attempts to create this file in order to avoid a race condition when two events are dispatched from upsmon at nearly the same time. This file will only exist briefly. It must not be created by any other process.

You should put this in the same directory as PIPEFN.

AT notifytype upsname command

Define a handler for a specific event notifytype on UPS upsname. upsname can be the special value * to apply this handler to every UPS.

This will perform the command command when the notifytype and upsname match the current activity. Possible values for command are:

START-TIMER timername interval

Start a timer of interval seconds. When it triggers, it will pass the argument timername as an argument to your CMDSCRIPT. Each invocation starts an independent timer, even if the timername was already registered and started (note this can mess up subsequent CANCEL-TIMER operations).

Example:

Start a timer that will execute when any UPS (*) has been gone for 10 seconds

AT COMMBAD * START-TIMER upsgone 10

START-TIMER-SHARED timername interval

Start a timer of interval seconds. When it triggers, it will pass the argument timername as an argument to your CMDSCRIPT. Each invocation checks if the timername was already started, and if so — appends the current event’s UPSNAME, NOTIFYTYPE and NOTIFYMSG to the list of unique values it would report via environment variables (as a comma-separated string for UPSNAME and NOTIFYTYPE, and tab-separated sentences for NOTIFYMSG) when the timer does execute.

Note
Currently this updates the first seen instance with the timername (in case you managed to start many).
Example:

Start a timer that will execute when any UPS (*) has been gone for 10 seconds

AT COMMBAD * START-TIMER upsgone 10

CANCEL-TIMER timername [cmd]

Cancel a running timer called timername, if possible. If the timer has passed then pass the optional argument cmd to CMDSCRIPT.

Note
This removes the all seen instances with the timername (in case you managed to start many).
Example:

If a specific UPS (myups@localhost) comes back online, then stop the timer before it triggers

AT COMMOK myups@localhost CANCEL-TIMER upsgone

CANCEL-TIMER-MATCHED timername [cmd]

Similar to the above, but tries to only cancel the timername if it refers to the UPSNAME and NOTIFYTYPE values passed by caller. The NOTIFYMSG is ignored in this context.

Example:

If any UPS (*) reverts to utility power, then stop the timer before it triggers ONLY if that UPS is associated with the already scheduled timer:

AT ONLINE * CANCEL-TIMER-MATCHED onbattwarn

EXECUTE command

Immediately pass command as an argument to CMDSCRIPT.

Example:

If any UPS (*) reverts to utility power, then execute ups-back-on-line via CMDSCRIPT.

AT ONLINE * EXECUTE ups-back-on-line

Note that any AT that matches both the notifytype and the upsname for the current event will be used.

For a complete list of notifytype possible values, refer to the section NOTIFY EVENTS in upsmon(8).

upssched(8), upsmon(8)

The NUT (Network UPS Tools) home page: https://www.networkupstools.org/historic/v2.8.5/

04/07/2026 Network UPS Tools 2.8.5