Network UPS Tools#

NUT is a software which is able to monitor UPSs and take action when needed, such as shutting down a computer when the battery level is low.

See also

  • Network UPS Tools - ArchWiki 1

  • nut - Debian Wiki 2

Example for Eaton 650i USB#

  1. create the jobs directories

    mkdir -p /home/jobs/scripts/by-user/nut

  2. Install NUT

    apt-get install nut

  3. add the following to the UPS definitions file

    /etc/nut/nut.conf#
    1MODE=standalone

  4. add the following to the UPS configuration file

    /etc/nut/ups.conf#
    1[my_ups]
2    pollonly
3    driver = usbhid-ups
4    port = auto
5    vendorid = "0463"
6    productid = "FFFF"
7    pollfreq = 30
8    desc = "Eaton UPS on my pc"

  5. add the following to the administrative user definitions file

    /etc/nut/upsd.users#
    1[user]
2    password = password
3    upsmon master
4    actions = SET
5    instcmds = ALL

  6. add the following to the configuration file for the monitoring daemon

    /etc/nut/upsmon.conf#
     1MONITOR my_ups@127.0.0.1 1 user password master
 2
 3NOTIFYFLAG ONBATT   SYSLOG+WALL+EXEC
 4NOTIFYFLAG LOWBATT  SYSLOG+WALL+EXEC
 5NOTIFYFLAG FSD      SYSLOG+WALL+EXEC
 6NOTIFYFLAG COMMOK   SYSLOG+WALL+EXEC
 7NOTIFYFLAG COMMBAD  SYSLOG+WALL+EXEC
 8NOTIFYFLAG SHUTDOWN SYSLOG+WALL+EXEC
 9NOTIFYFLAG REPLBATT SYSLOG+WALL+EXEC
10NOTIFYFLAG NOCOMM   SYSLOG+WALL+EXEC
11NOTIFYFLAG ONLINE   SYSLOG+WALL+EXEC
12NOTIFYFLAG NOPARENT SYSLOG+WALL+EXEC
13
14NOTIFYCMD "/home/jobs/scripts/by-user/nut/ups_notify.sh"

    You can comment NOTIFYCMD or change it with a custom command. You can, for example, create a script like this script

    /home/jobs/scripts/by-user/nut/ups_notify.sh#
    1#!/usr/bin/env bash
2
3echo "$*" | gotify

  7. restart all NUT services

    systemctl restart nut-driver.service
systemctl restart nut-server.service
systemctl restart nut-monitor.service

  8. fix the permissions

    chmod 700 -R /home/jobs/scripts/by-user/nut
chown -R nut:nut /home/jobs/scripts/by-user/nut

  9. remove the plug from the UPS and check if the NOTIFYCMD command is executed and if you get broadcast messages on the terminal, such as

    Broadcast message from ...
UPS my_ups@127.0.0.1 on battery

  10. put the plug back in the UPS

Footnotes

1

https://wiki.archlinux.org/title/Network_UPS_Tools GNU Free Documentation License 1.3 or later, Copyright (c) ArchWiki contributors

2

https://wiki.debian.org/nut See https://wiki.debian.org/DebianWiki/LicencingTerms