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powstatd for Debian
-------------------
Powstatd for Debian comes in two favours: the regular powstatd package and
the non-us section powstatd-crypt package. Use the powstatd package if
your UPS feeds power to a single computer. If a single UPS feeds power to
many computers (one connected to the UPS via a serial cable and running
powstatd in master mode, and one or more others running powstatd in slave
mode to get power-line status from the master computer) then consider using
powstatd-crypt if you are on an unsecure network and want to avoid the
possibility of a cracker forcing a shutdown of your slave computers by
faking power failure signals from the master computer.
----------
Quickstart:
After installing the powstatd package, you must configure it by editing the
file /etc/powstatd.conf to suit your UPS and serial line, and then remove
the line:
#!Unconfigured! Please customize the file as appropriate and remove this line
The daemon /etc/init.d/powstatd won't start until that "Unconfigured"
comment is removed.
See the powstatd (8) man page for help on configuring /etc/powstatd.conf.
The directory /usr/share/doc/powstatd/ contains a few powstatd.conf sample
files. If you get this software working with a different UPS models,
please let me know and I will include your conf file as another example and
I will forward it upstream.
After your conf file is correctly setup, you may then start the powstatd
daemon by executing, as root:
# /etc/init.d/powstatd start
You may also want to edit /etc/init.d/powerfail at the line:
failtime=+5 # shutdown delay from initial power failure
It sets the shutdown delay to 5 minutes after power line failure detection.
You may want to increase that if your UPS has lots of power to spare, or
reduce it.
----------
The package differs from the upstream installation in a few ways:
_ Added the #!Unconfigured! comment in /etc/powstatd.conf to avoid
starting an unconfigured daemon.
- Upstream wants /etc/inittab to have the following lines:
# UPS signals a power outage.
pf:12345:powerfail:/sbin/powstatd.fail
# UPS signals power restored before the shutdown kicks in.
pr:12345:powerokwait:/sbin/powstatd.ok
# UPS signals low battery power: emergency shutdown.
pn:12345:powerfailnow:/sbin/powstatd.low
On Debian, the calls are to a single script with differing arguments:
# What to do when the power fails/returns.
pf::powerwait:/etc/init.d/powerfail start
pn::powerfailnow:/etc/init.d/powerfail now
po::powerokwait:/etc/init.d/powerfail stop
I have therefore created a /etc/init.d/powerfail script which combines
the actions of the 3 upstream scripts.
- The scripts /etc/init.d/powstatd and /etc/init.d/powerfail are written
for Debian; We don't use the upstream /sbin/powstatd.{fail|low|ok}
scripts for compatibility with Debian's inittab. The upstream
/etc/init.d/powstatd script (to start and stop the powstatd daemon)
shuts down the UPS when called with the "stop" argument (by sending a
`powstatd -k` signal). On Debian, we simply shut down the daemon on
"stop"; Killing the UPS is done in /etc/init.d/halt by calling the same
script (symlinked to "ups-monitor") with the "poweroff" option.
Peter S Galbraith <psg@debian.org>, Mon, 23 Aug 1999 12:58:55 -0400
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