Gregory Deal via plug on 28 Mar 2025 09:20:25 -0700


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[PLUG] Going nuts with NUT

I'm trying to have a UPS shutdown multiple computers (2 Macs and a NAS). Initially I thought "how do you connect a single UPS to multiple machines?". Some initial searching suggests using NUT (Network UPS Tools) to have the computer attached to the UPS direct the remaining ones to also shutdown. Looking further into results, tutorials, and networkupstools.org/docs/user-manual.chunked, I then did what I thought was needed to various conf's and users files. I think I'm getting close, but I suspect I'm missing something simple, so I hope someone can say "Hey, just add this line to this file". 
 
Details:
 I have an APC UPS BE850G2 which claims to support monitoring. A Mac Studio is attached to it over a USB cable. The Mac's "System Information" shows it in the USB Devices section. And the "System Settings" "Energy Saver" "UPS Options" presents the basic options of "Shut down after using UPS battery for ........, time remaining on UPS battery . . . , UPS battery level below . . .", so it looks like the UPS is correctly connected and able to be talked to. 
 
I then installed nut (brew install nut), and set up various conf/users files like I thought search results suggested for my situation:
 
[Gregorys-Mac-Studio]:(gkd) /opt/homebrew/etc/nut $ ll
total 280
-rw-r--r-- 1 gkd admin 4791 Mar 27 13:28 nut.conf
-rw-r--r-- 1 gkd admin 4774 Mar 26 12:21 nut.conf.sample
-rw-r--r-- 1 gkd admin 10468 Mar 27 14:00 ups.conf
-rw-r--r-- 1 gkd admin 10409 Mar 26 12:21 ups.conf.sample
-rw-r--r-- 1 gkd admin 9207 Mar 27 12:37 upsd.conf
-rw-r--r-- 1 gkd admin 9207 Mar 26 12:21 upsd.conf.sample
-rw-r--r-- 1 gkd admin 2423 Mar 27 13:16 upsd.users
-rw-r--r-- 1 gkd admin 2349 Mar 27 11:37 upsd.users.sample
-rw-r--r-- 1 gkd admin 24843 Mar 27 13:16 upsmon.conf
-rw-r--r-- 1 gkd admin 24767 Mar 26 12:21 upsmon.conf.sample
-rw-r--r-- 1 gkd admin 4269 Mar 26 12:21 upssched.conf.sample
 
In nut.conf:
 
< MODE=none
---
> # MODE=none
> MODE=netserver
 
In ups.conf:
 
> # 20250327 gkd
> [myups]
> driver = usbhid-ups         (from NUT's hardware compatibility list)
> port = auto
 
No changes in upsd.conf
 
In upsd.users:
 
> # 20250327 gkd
> [gkd]
> password = pw
> upsmon primary
 
In upsmon.conf:
 
> RUN_AS_USER gkd
118a120,121
> # 20250327 gkd
> MONITOR myups@localhost 1 gkd pw primary
 
Trying stuff, running "upsmon" gets:
 
[Gregorys-Mac-Studio]:(gkd) /opt/homebrew/etc/nut $ upsmon
Network UPS Tools upsmon 2.8.2
kill: No such process
UPS: myups@localhost (primary) (power value 1)
Using power down flag file /etc/killpower
Broadcast Message from gkd@Gregorys-Mac-Studio.local
(no tty) at 12:08 EDT...
Communications with UPS myups@localhost lost

Broadcast Message from gkd@Gregorys-Mac-Studio.local
(no tty) at 12:08 EDT...
UPS myups@localhost is unavailable
 
(and continues to ding every few minutes).
 
 
I saw that "upsdrvctl" might supply some interrogation/control, but:
 
[Gregorys-Mac-Studio]:(gkd) /opt/homebrew/etc/nut $ upsdrvctl start
Network UPS Tools - UPS driver controller 2.8.2
Network UPS Tools - Generic HID driver 0.53 (2.8.2)
USB communication driver (libusb 1.0) 0.47
Can't claim USB device [051d:0002]@0/0/0: Access denied (insufficient permissions)
upsnotify: failed to notify about state 4: no notification tech defined, will not spam more about it
Driver failed to start (exit status=1)
Network UPS Tools - Generic HID driver 0.53 (2.8.2)
USB communication driver (libusb 1.0) 0.47
Can't claim USB device [051d:0002]@0/0/0: Access denied (insufficient permissions)
upsnotify: failed to notify about state 4: no notification tech defined, will not spam more about it
Driver failed to start (exit status=1)
Network UPS Tools - Generic HID driver 0.53 (2.8.2)
USB communication driver (libusb 1.0) 0.47
Can't claim USB device [051d:0002]@0/0/0: Access denied (insufficient permissions)
upsnotify: failed to notify about state 4: no notification tech defined, will not spam more about it
Driver failed to start (exit status=1)
 
Poking around:
 
[Gregorys-Mac-Studio]:(gkd) /opt/homebrew/etc/nut $ ps -ef|grep ups
0 177 1 0 Wed01PM ?? 0:06.72 /usr/sbin/cupsd -l
0 395 1 0 Wed01PM ?? 0:32.25 /usr/libexec/ioupsd
501 5170 1 0 2:12PM ?? 0:07.89 upsd
501 7622 1 0 12:08PM ?? 0:00.00 upsmon
501 7623 7622 0 12:08PM ?? 0:00.04 upsmon
501 7647 608 0 12:14PM ttys000 0:00.00 grep ups
 
To kill the dinging:
 
[Gregorys-Mac-Studio]:(gkd) /opt/homebrew/etc/nut $ upsmon -c stop
 
 
So, can this scheme work? Am I close? Anything else to try?
 
Thanks.
 
Greg 
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