NUT client(s)

This is part 2 of my Raspberry Pi as UPS server via the NUT post a while back. I configured my Raspberry Pi to be my NUT server. I have three Cyberpower UPS connected to the RPi via USB cables.

To make a node a NUT client, we need to install the nut-client package.

apt install nut-client

Once the nut-client has been installed, we need to modify some of the NUT configurations. The configuration files are located in /etc/nut/. The configuration files that require some modification are the following. The description of each configuration is from its man page.

  • upsmon.conf – This file’s primary job is to define the systems that upsmon will monitor and to tell it how to shut down the system when necessary. It will contain passwords, so keep it secure. Ideally, only the upsmon process should be able to read it
  • nut.conf – This file attempts to standardize the various files being found in different installations
  • upssched.conf – This file controls the operations of upssched, the timer-based helper program for upsmon
  • upssched-cmd – This script file needs to be created. The script will be called by the upssched

We are going to start with the upsmon.conf. At this point, adjust the values based on your own environment then paste the configuration to the terminal.

cat > /etc/nut/upsmon.conf << EOF
RUN_AS_USER root

MONITOR [email protected] 1 username password slave

MINSUPPLIES 1
SHUTDOWNCMD "/sbin/shutdown -h"
NOTIFYCMD /usr/sbin/upssched
POLLFREQ 2
POLLFREQALERT 1
HOSTSYNC 15
DEADTIME 15
POWERDOWNFLAG /etc/killpower

NOTIFYMSG ONLINE    "UPS %s on line power"
NOTIFYMSG ONBATT    "UPS %s on battery"
NOTIFYMSG LOWBATT   "UPS %s battery is low"
NOTIFYMSG FSD       "UPS %s: forced shutdown in progress"
NOTIFYMSG COMMOK    "Communications with UPS %s established"
NOTIFYMSG COMMBAD   "Communications with UPS %s lost"
NOTIFYMSG SHUTDOWN  "Auto logout and shutdown proceeding"
NOTIFYMSG REPLBATT  "UPS %s battery needs to be replaced"
NOTIFYMSG NOCOMM    "UPS %s is unavailable"
NOTIFYMSG NOPARENT  "upsmon parent process died - shutdown impossible"

NOTIFYFLAG ONLINE   SYSLOG+WALL+EXEC
NOTIFYFLAG ONBATT   SYSLOG+WALL+EXEC
NOTIFYFLAG LOWBATT  SYSLOG+WALL
NOTIFYFLAG FSD      SYSLOG+WALL+EXEC
NOTIFYFLAG COMMOK   SYSLOG+WALL+EXEC
NOTIFYFLAG COMMBAD  SYSLOG+WALL+EXEC
NOTIFYFLAG SHUTDOWN SYSLOG+WALL+EXEC
NOTIFYFLAG REPLBATT SYSLOG+WALL
NOTIFYFLAG NOCOMM   SYSLOG+WALL+EXEC
NOTIFYFLAG NOPARENT SYSLOG+WALL

RBWARNTIME 43200

NOCOMMWARNTIME 600

FINALDELAY 5
EOF

We need to set the nut.conf MODE to nutclient.

echo "MODE=netclient" > /etc/nut/nut.conf

We need to configure the upssched.conf

cat > /etc/nut/upssched.conf << EOF
CMDSCRIPT /etc/nut/upssched-cmd
PIPEFN /etc/nut/upssched.pipe
LOCKFN /etc/nut/upssched.lock

AT ONBATT * START-TIMER onbatt 30
AT ONLINE * CANCEL-TIMER onbatt online
AT ONBATT * START-TIMER earlyshutdown 30
AT LOWBATT * EXECUTE onbatt
AT COMMBAD * START-TIMER commbad 30
AT COMMOK * CANCEL-TIMER commbad commok
AT NOCOMM * EXECUTE commbad
AT SHUTDOWN * EXECUTE powerdown
AT SHUTDOWN * EXECUTE powerdown
EOF

We need to create and configure the script and make it executable.

cat > /etc/nut/upssched-cmd << EOF

#!/bin/sh
 case $1 in
       onbatt)
          logger -t upssched-cmd "UPS running on battery"
          ;;
       earlyshutdown)
          logger -t upssched-cmd "UPS on battery too long, early shutdown"
          /usr/sbin/upsmon -c fsd
          ;;
       shutdowncritical)
          logger -t upssched-cmd "UPS on battery critical, forced shutdown"
          /usr/sbin/upsmon -c fsd
          ;;
       upsgone)
          logger -t upssched-cmd "UPS has been gone too long, can't reach"
          ;;
       *)
          logger -t upssched-cmd "Unrecognized command: $1"
          ;;
 esac
EOF
chmod 744 /etc/nut/upssched-cmd

Start the nut-client

systemctl restart nut-client

Make sure that you can pull the info using the upsc command

upsc [email protected]

Make sure to test the client that it is working. That is it. Cheers!

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