I’ve got a couple of LINUX servers and a Synology NAS on my CyberPower 1350 UPS. I’d like to monitor the battery level and OUTAGES. I can use the little pushbutton on the front to poke through the status OR I can install NUT and monitor my UPS with a cool webpage and much better statistics! I’m going the webpage route!
Setting up NUT on Raspberry
Image an SD card and do the usual setup steps. Check my GUIDE if you have questions. I changed the hostname to “ups” to identify my new server. Plug a USB cable into the UPS and into the Raspberry. Check your connection with “lsusb”, literally “list USB devices”:
pi@ups:~ $ lsusb Bus 001 Device 004: ID 0764:0501 Cyber Power System, Inc. CP1500 AVR UPS Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub pi@ups:~ $
Looks good. I see my UPS at the top of the list. Now install the monitoring software:
apt-get update && apt-get install nut nut-client nut-server
This is the Network UPS Tools package or “NUT” for short. Nice to have real-world tools in the Raspberry repositories for easy installs! w00t!
First, let’s add the connection and the UPS to the config in /etc/nut/ups.conf. I like to add my stuff right at the bottom so I can find it quickly in the future. Add the following “stanza”:
[servers] driver = usbhid-ups port = auto desc = "CyberPower CP1350 AVR UPS"
Hopefully, YOUR UPS is like mine and works well with the usbhid-ups driver. The name can be whatever suits your fancy. Put it in [square] brackets. The desc(ription) is also completely up to you. I would say, try the auto settings–otherwise, you can look up your model here.
Next, we need to setup upsmon. Again, I’m just going to add what I need to the end of the file. The first line shows the format. You can include it as a comment for future reference. :
# MONITOR <system> <powervalue> <user> <password> ("master"|"slave") MONITOR ups@localhost 1 monuser secret master
The system is the name that we configured in the last bit. Powervalue of 1 is fine for home use. Username and password are at your discretion. (Mine are based on the hardcoded credentials that a Synology NAS uses.) “master” because the UPS is attached directly to this device through the USB cable. The clients will be defined as “slave”.
This same “user” is then added to /etc/nut/upsd.conf. At the very bottom of the file, add:
[monuser] password = secret upsmon master
Finally, set the mode of how this whole thing will function. Edit /etc/nut/nut.conf and change the last line:
The Big Restart
Now, let’s restart these processes and see if we can connect. I’m going to just reboot. That will ensure that all the config files got saved and the unit files are all enabled. Once the Raspberry comes back up, try to connect with UPSC and the name of your UPS:
root@ups:~# upsc servers@localhost Init SSL without certificate database battery.charge: 53 battery.charge.low: 10 battery.charge.warning: 20 battery.mfr.date: CPS battery.runtime: 490 battery.runtime.low: 300 battery.type: PbAcid battery.voltage: 13.7 battery.voltage.nominal: 12 device.mfr: CPS device.model: CP 1350C device.type: ups driver.name: usbhid-ups driver.parameter.pollfreq: 30 driver.parameter.pollinterval: 2 driver.parameter.port: auto driver.parameter.synchronous: no driver.version: 2.7.4 driver.version.data: CyberPower HID 0.4 driver.version.internal: 0.41 input.transfer.high: 140 input.transfer.low: 90 input.voltage: 123.0 input.voltage.nominal: 120 output.voltage: 123.0 ups.beeper.status: enabled ups.delay.shutdown: 20 ups.delay.start: 30 ups.load: 33 ups.mfr: CPS ups.model: CP 1350C ups.productid: 0501 ups.realpower.nominal: 298 ups.status: OL CHRG ups.test.result: Done and warning ups.timer.shutdown: -60 ups.timer.start: 0 ups.vendorid: 0764 root@ups:~#
UPS Web Server
YAY! It works! Now, to install the web component, as promised! First, install the webserver and the NUT web stuff:
apt install apache2 nut-cgi
Edit /etc/nut/hosts.conf to allow CGI scrips access to the monitor. Add one line to the bottom of the file:
MONITOR servers@localhost "Server UPS"
Enable CGI in apache and restart the web server:
root@ups:/etc/nut# a2enmod cgi Your MPM seems to be threaded. Selecting cgid instead of cgi. Enabling module cgid. To activate the new configuration, you need to run: systemctl restart apache2 root@ups:/etc/nut# systemctl restart apache2 root@ups:/etc/nut#
Now, you just need to convince apache that you really, really want to turn on CGI by uncommenting the following in /etc/nut/upsset.conf:
…and you should be able to hit the webpage:
Do you remember the username and password that we configured for upsmon? You’re going to need it here! Once you’re logged in, you can take a look at your status, or actually issue commands to the UPS! (No wonder it’s password protected!) Another page that comes with the package is here:
Next post, we look at configuring the client or “slave” systems. This allows the upsmon process to send shutdown commands to the servers that are plugged into this UPS and do an orderly shutdown instead of crashing when the lights go out!