[Nut-upsuser] Multiple servers connected to the same UPS

Greg Vickers daehenoc at iinet.net.au
Tue Jun 24 10:46:37 UTC 2014

Hi Philippe,

On 23/06/2014 7:20 pm, Philippe Andersson wrote:
> On 23/06/14 04:32, Stan Gammons wrote:
>> Can one have a single UPS powering multiple servers and have them all
>> shutdown in an orderly fashion pending a power loss?   It seems as
>> though this is possible from what I gathered from the docs, but I've yet
>> to make this work on an OpenBSD and FreeNAS machine that are powered
>> from the same UPS. The master server that the UPS is connected to via
>> USB receives messages from the UPS, but the slave doesn't receive any
>> messages.  Any tips on how to make this work?
> Yes, it is indeed possible. Here is a brief description of my typical
> configuration:
Excellent, thank you very much for sharing this information, this is 
exactly what I wish to do with my NUT installation :)
> - install NUT on all the participating servers
> - the machine that is physically connected to the UPS (serial or USB)
> becomes the "NUT server", all others are "NUT clients".
> - the NUT server has the entire NUT stack (driver, upsd, upsmon, upssched)
> - NUT clients only use upsmon, and "MONITOR" the UPS published by the
> NUT server
> - on the NUT server, use "upssched" to initiate a countdown timer on
> "ONBATT" events
> - if the countdown timer expires before the power returns, a custom
> script is called that issues a "FSD" (forced shutdown) -- this message
> is sent to all participating servers
> - on each participating server, configure the shutdown command
> (upsmon.conf) with a suitable grace period to take into account the
> dependencies between servers (if any).
> If you need more information, please mail me directly -- I can share the
> configuration files and scripts I use.
Can I get a copy of your configuration files too please?

I've got a laptop with low power requirements hooked up as my nut 
server, so I'm actually going to configure nut to not shutdown the 
laptop, I want it to keep on running even after the UPS has run out of 
battery, and the power management on the laptop will shut down the 
laptop.  I'd even like to do a wake-on-LAN to the server, once the UPS 
has gotten back to, say, 50% battery.

> Cheers. Bye.
> Ph. A.
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