[Nut-upsuser] turn UPS off after PC shutdown

[Dario Novakovic]

Exactly Jim,  this bothers me too much to give up :)

My upsmon.conf *does contain* line: POWERDOWNFLAG /etc/killpower

I checked for the existence of the file during shutdown with "/sbin/upsmon -K", and it exited with "1", meaning error: no POWERDOWNFLAG.


It is actually Truenas 25.04, with NUT 2.8.0. This may be Truenas issue, but I would like to check NUT first.

Now, for the logs: all I see about killpower is this line
     nut-monitor[2688]: Using power down flag file /etc/killpower
and it is logged when NUT service is starting. Thats all. No errors.


I attached log of the shutdown procedure. Truenas is configured to shutdown in 60 seconds after power failure, and that is OK, but nothing about "killpower".


Now I wonder what creates POWERDOWNFLAG, and why it is not created.  I attached shutdown log, removed uneeded lines. Truenas is configured to wait 60 seconds and if power is not restored it shuts down.

Thanks,
Dario




On Monday, June 16, 2025 at 05:23:46 PM GMT+2, Jim Klimov <jimklimov+nut at gmail.com> wrote: 


>Cheers,
>
>  Your test results seem encouraging, so giving up now sounds unfortunate - perhaps just one more push is needed:
>
>* if `upsdrvctl shutdown` works, then at least basic driver settings in ups.conf (and driver+device) do suffice for the action;
>* for a "killpower file", check that your upsmon.conf contains a line like
>
>POWERDOWNFLAG /etc/killpower
>
>** This line must be explicitly present (although a good path might be in a tmpfs, like /run/nut/killpower instead).
>** Check upsmon logs - at least current NUT code should report if the value is defined or not, and if it failed to create the file for example.
>
>* For the file to have effect, it should be consulted during OS shutdown. I think you've never mentioned the OS nor NUT version, so details of this part are highly variable. In a Linux system with systemd and NUT v2.8.x, you would have a />usr/lib/systemd/system-shutdown/nutshutdown to call `upsdrvctl shutdown` when deemed needed.
>
>Jim


On Mon, Jun 16, 2025, 14:11 Dario Novakovic via Nut-upsuser <nut-upsuser at alioth-lists.debian.net> wrote:
> Thanks Jim and Robert!
> 
> I confirmed that ups understands "turn off" request from the PC, with "upsdrvctl shutdown".
> However, I am not sure if "killpower" file is created, when ups goes on battery.
> 
> On the other hand I am not sure how CyberPower UPS interprets config params: offdelay, ups.delay.shutdown, ups.timer.shutdown. I have been through so many docs, forums, issue reports, etc.
> This is so confusing and messy, I am giving up. 
> 
> 
> Thanks all,
> Dario
> 
> 
> 
> 
> On Thursday, June 12, 2025 at 05:15:02 PM GMT+2, Dario Novakovic via Nut-upsuser <nut-upsuser at alioth-lists.debian.net> wrote: 
> 
> I am using truenas with Cyber power CP900EPFCLCD UPS. All is well, server shuts down after power loss in specified time.
> 
> Problem is that UPS remains ON. I would like UPS to turn OFF and I will turn it on, when the power comes back. I tried many various configuration but it does not affect the UPS.
> 
> Before I send all my config files and everything, I would like to understand how it works. 
> 
> I have been messing with nut for days, setting various "delay"s, tried many different settings and configs but I feel like I am missing something. I have couple of general questions:
> 
> 1. Is it possible to turn the UPS off, after PC shut down.
> 2. If yes, how does it work? What makes UPS go off, when PC is off? What kind of command or information is sent to UPS to make it turn off
> 3. What is the purpose of "ups.delay.shutdown". Documentation says "Interval to wait after shutdown with delay command (seconds)". "Wait" for what exactly?
> 
> 
> Thanks,
> Dario
> 
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