Quick steps to configure UPS on Debian 8 (jessie).

Connect UPS to Server⌗

  1. Recommended shutdown server and disable power before connect if it’s RS-232(COM port);
  2. Check correct device path from “dmesg” output;

Install⌗

  1. Required to install nut-client, nut-server
  2. For collecting data into RRD database we also need to install Collectd with NUT plugin;
sudo -i
aptitude update; aptitude install nut-client nut-server collectd

dpkg -l | egrep "nut-|collectd" | awk '{ if ($1=="ii"); print $3"\t"$2}' 
5.4.1-6+deb8u1	collectd
5.4.1-6+deb8u1	collectd-core
5.4.1-6+deb8u1	collectd-utils
5.4.1-6+deb8u1	libcollectdclient1
2.7.2-4	nut-client
2.7.2-4	nut-server

Configure⌗

Configure NUT server - first. If it will not work anything else - is not important :) Check your serial port path and replace /dev/ttyS0 if it’s different.

cat >> /etc/nut/ups.conf << EOF
[ups]

        driver = blazer_ser
        port = /dev/ttyS0
        desc = "my server1 ups"
EOF

If you are using USB connection than change “driver” variable also with path.

Testing⌗

Testing NUT-server by starting plugin binary manually:

root@server:~# /lib/nut/blazer_ser -a ups 
Network UPS Tools - Megatec/Q1 protocol serial driver 1.56 (2.7.2)
Duplicate driver instance detected! Terminating other driver!
Supported UPS detected with megatec protocol
Vendor information unavailable
No values provided for battery high/low voltages in ups.conf

Using 'guestimation' (low: 10.400000, high: 13.000000)!
Battery runtime will not be calculated (runtimecal not set)

Data returned OK. If you see error with connection - check file /dev/ttyS0 permissions.

ls -lah /dev/ttyS0 
crw-rw---- 1 root nut 4, 64 Nov 16 14:43 /dev/ttyS0

If after all you still see error - try different port.

Configure UPSD with minimal options:

echo "LISTEN 127.0.0.1 3493" >> /etc/nut/upsd.conf
service ups-monitor restart

Check UPSD is listening local interface only and is up:

$ netstat -tnlp | grep ups
tcp        0      0 127.0.0.1:3493          0.0.0.0:*               LISTEN      4585/upsd

Configure NUT client:

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

Testing⌗

Testing NUT-client connection to NUT-server

root@server:~# upsc ups
Init SSL without certificate database
battery.charge: 100
battery.voltage: 13.40
battery.voltage.high: 13.00
battery.voltage.low: 10.40
battery.voltage.nominal: 12.0
device.type: ups
driver.name: blazer_ser
driver.parameter.pollinterval: 2
driver.parameter.port: /dev/ttyS0
driver.version: 2.7.2
driver.version.internal: 1.56
input.current.nominal: 2.0
input.frequency: 49.9
input.frequency.nominal: 50
input.voltage: 222.3
input.voltage.fault: 221.8
input.voltage.nominal: 220
output.voltage: 222.3
ups.beeper.status: enabled
ups.delay.shutdown: 30
ups.delay.start: 180
ups.load: 22
ups.status: OL
ups.temperature: 25.0
ups.type: offline / line interactive

Configure RRD database⌗

Let’s configure NUT plugin for collectd

cat >> /etc/collectd/collectd.conf.d/nut.conf << EOF
LoadPlugin nut
<Plugin nut>
        UPS "ups@localhost:3493"
</Plugin>
service collectd restart

Check new files created with RRD database data:

root@server:~# ls -1 /var/lib/collectd/rrd/server/nut-ups/
frequency-input.rrd
percent-charge.rrd
percent-load.rrd
temperature-ups.rrd
voltage-battery.rrd
voltage-input.rrd
voltage-output.rrd

Options about UPS actions can be checked here:

egrep -v "^#|^$" /etc/nut/upsmon.conf 
MINSUPPLIES 1
SHUTDOWNCMD "/sbin/shutdown -h +0"
POLLFREQ 5
POLLFREQALERT 5
HOSTSYNC 15
DEADTIME 15
POWERDOWNFLAG /etc/killpower
RBWARNTIME 43200
NOCOMMWARNTIME 300
FINALDELAY 5

Now we can open this database using GUI or via web-collectd Frontend: