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--- technical:24.04_ups_setup_with_nut [2026/01/05 23:22] – mark_scottworld.net
+++ technical:24.04_ups_setup_with_nut [2026/01/14 17:27] (current) – mark_scottworld.net
@@ Line 1: / Line 1: @@
-APC UPS Devices
+==== APC UPS Devices ====
 Install the required packages:
@@ Line 23: / Line 23: @@
   apcaccess
+NOTE: Currently this package is old and produces constant errors in the events log. - it may be better to use NUT
+==== Using NUT for UPS ====
+Install the required packages:
+  apt install nut
+Edit the ups.conf file.
+  nano /etc/nut/ups.conf
+Add the following at the bottom of the file.
+ [apc]
+ driver = usbhid-ups
+ port = auto
+ #cable = 940-0095B
+ desc = "Back-UPS BX750MI"
+ #override.battery.charge.low = 50
+ #onlinedischarge_calibration = set
+ pollonly
+ lbrb_log_delay_sec = 3
+ lbrb_log_delay_without_calibrating
+Edit /etc/nut/upsd.conf
+  nano /etc/nut/upsd.conf
+Uncomment and modify the following lines.
+  MAXAGE 30
+  LISTEN 127.0.0.1 3493
+  MAXCONN 10
+Edit the file  /etc/nut/upsd.users
+  nano /etc/nut/upsd.users
+Add the following to the end of the file.
+  [upsuser]
+  password=<secret>  <-- This can be anything (make up some secret)
+  upsmon master
+Edit /etc/nut/upsmon.conf
+  nano /etc/nut/upsmon.conf
+Uncomment and set the following lines...
+  MONITOR apc@localhost 1 upsuser <secret> master
+  NOTIFYCMD /etc/nut/notify-email
+  SHUTDOWNCMD "/sbin/shutdown -P +0"
+  DEADTIME 20
+  NOTIFYFLAG ONLINE     SYSLOG+WALL+EXEC
+  NOTIFYFLAG ONBATT     SYSLOG+WALL+EXEC
+  NOTIFYFLAG LOWBATT    SYSLOG+WALL+EXEC
+  NOTIFYFLAG FSD        SYSLOG+WALL+EXEC
+  NOTIFYFLAG COMMOK     SYSLOG+WALL+EXEC
+  NOTIFYFLAG COMMBAD    SYSLOG+WALL+EXEC
+  NOTIFYFLAG SHUTDOWN   SYSLOG+WALL+EXEC
+  NOTIFYFLAG REPLBATT   SYSLOG+WALL+EXEC
+  NOTIFYFLAG NOCOMM     SYSLOG+WALL+EXEC
+  NOTIFYFLAG NOPARENT   SYSLOG+WALL+EXEC
+Now create a script to send email notifications /etc/nut/notify-email
+  nano /etc/nut/notify-email
+In /etc/nut/notify-email add:  (you will need to prefix the file with a bash shell)
+<code>
+#!/bin/s<remove>h characters (this line is messed due to wiki not allowing them)
+SUBJECT="`hostname`: Power Event"
+FROM_ADDR="root@<host>.net"
+FROM_NAME="UPS"
+TO="<recepient>"
+echo "Subject: $SUBJECT\n\n$*" | sendmail -f "$FROM_ADDR" -F "$FROM_NAME" "$TO"
+</code>
+Set the necessary permissions:
+<code>
+chown root:nut ups.conf upsd.conf upsd.users upsmon.conf notify-email
+chmod 0640 ups.conf upsd.conf upsd.users upsmon.conf
+chmod 0750 notify-email
+</code>
+Change the following in /etc/nut/nut.conf:
+  MODE=standalone
+Restart the UPS monitoring service:
+<code>
+systemctl restart nut-server.service
+systemctl restart nut-monitor.service
+</code>
+Check /var/log/syslog for errors and check communication with:
+  upsc apc@localhost
+(You may need to reboot before the USB is allowed to talk to the UPS).