[Nut-upsuser] turn UPS off after PC shutdown

[Jim Klimov]

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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