[Nut-upsdev] Is there any "fake UPS" driver (and Solaris 10+ integration)?

Jim Klimov jimklimov at cos.ru
Wed Jan 9 17:39:18 UTC 2013

Hello all,

   I am a long-time user of NUT (since last millennium, or so it seems)
and beside Linux where I've started, I also integrated it with our
Solaris 8 and 9 servers' shutdown procedures - avoiding the possible
"hole" when the line power returns right at the bad moment when UPSes
and systems are already told to power off. In this case, they see no
event like "I am off, power returned" and don't come back online.
This happens surprisingly more often than one would think ;)

The recommended solution at that time was to turn off services, sync
the disks and wait for the UPS to deplete - or reboot the OS after a
long timeout (15min or so). This worked like a charm for me on Linux
and older Solarises, where OS init was managed by scripts - where my
package installation could hack into.

Some time in the Solaris 10 (now valid for sol10, sol11, OI and its
other relatives) the OS lifetime management changed from scripts
to a compiled program (bootadm) integrated with SMF, which includes
a forced kill of all processes after a hardcoded shutdown timeout,
so the proper procedure to avoid the "hole" became tricky - and the
old solution no longer works completely properly.

For some time I've been meaning to dig into the problem, and found
that I need a tool to emulate poweroffs for a testbed (VM likely).
What better tool would it be than a fake UPS driver that reports
to NUT clients whatever I feed it (via pipe or some other mechanism)?

So I thought the NUT devs would likely have this for a long time ;)
A cursory google search found no relevant hits, so I guess this fake
UPS driver is not published - or I used wrong keywords... So: is there
any ready-to-use tool/technique to fool NUT clients into believing
they are OnLine/OnBattery/Critical and must shutdown, so that I can
test and debug the OS-side shutdown procedures without really toggling
power on hardware systems?

//Jim Klimov

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