[CentOS] 2 questions re UPS management

SilverTip257 silvertip257 at gmail.com
Tue Mar 19 23:20:07 UTC 2013


On Tue, Mar 19, 2013 at 12:44 PM, Fred Smith
<fredex at fcshome.stoneham.ma.us>wrote:

> On Tue, Mar 19, 2013 at 11:10:07AM -0400, m.roth at 5-cent.us wrote:
> > Fred Smith wrote:
> > > Hi, trying to figure out how the system manages UPS connections. On
> both
> > > Centos 5.9 and 6.4, merely plugging in a USB UPS device causes an icon
> > > to appear in the top panel, and (at least on 5.9, haven't yet tested
> > > this in 6.4) when the UPS suffers a power failure the system notices
> > > and after a bit does a clean shutdown.
> >
> > Interesting.... I haven't observed this behavior; certainly not on
> > headless servers, though most are on UPSes; nor, when I had a working UPS
> > for my workstation, have I seen it. Are you running gnome or KDE?
> > >
> > > All this without installing ANYTHING extra.
> > >
> > You mean, like apcupsd?
>
> Yes, nor "nut" either.
>

http://www.networkupstools.org/

[ I had to look it up ... so hopefully this will help those other curious
people out there. ]


>
> >
> > > question #1:
> > > in 5.9 there are two entries in /etc/inittab, one for power fail and
> > > the other for power restoration. The default setting for the powerfail
> > > entry has it doing a shutdown in 2 minutes.
> > <snip>
> > > message (when power fails) about the line being too long. So, I created
> > > a shellscript that runs both the command to tell XP to go down,
> followed
> > <snip>
> > > When I run this script from the commandline it works just fine. but
> when
> > > I turn off input power to the UPS it starts the  XP shutdown then
> within
> > > without waiting the specified length of time, initiates the shutdown
> > > of Linux. Once the shutdown is done, the UPS powers off, thereby
> killing
> > > the not-yet-shutdown windoze box.
> >
> > Thinking about this as I write, I'd guess that it expects the machine
> > *receiving* the shutdown to respect the five minute wait. What you might
> > want to do is a sleep 300 before sending the command.
> > <snip>
>
> just to be sure I'm clear: the shutdown command appears to be sent
> to windows, as I desire. then instead of honoring the "+5" in the
> local shutdown command it shuts down immediately.
>
> but if I just run the identical script from a commandline it does
> exactly what I think it should: (1) tells windows to shut down then (2)
> waits 5 mins before shutting down Linux.
>
> --
> ---- Fred Smith -- fredex at fcshome.stoneham.ma.us-----------------------------
>   "For him who is able to keep you from falling and to present you before
> his
>  glorious presence without fault and with great joy--to the only God our
> Savior
>  be glory, majesty, power and authority, through Jesus Christ our Lord,
> before
>                      all ages, now and forevermore! Amen."
> ----------------------------- Jude 1:24,25 (niv)
> -----------------------------
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-- 
---~~.~~---
Mike
//  SilverTip257  //



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