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networking is considerably different from the old method described at the
beginning of this chapter. In the old code, there is a lot of configuration on
both the master and slave side, and the master polls or sends info to the
slave. Using the net driver is much simpler. However, you should carefully
check that the NIS slave does a proper shutdown. In the master/slave code,
the master ensures the best it can that the slave is shutdown or notified
before it shuts down itself. On the other hand, using the net driver, the
NIS server knows nothing about the NIS slaves that may be listening and
thus takes no special precautions to ensure that the NIS slaves receive the
shutdown signal. Since the NIS slave reads the master’s data once per second
there should be no shutdown problems, and our experience confirms this.
This question can only be answered by carefully testing the shutdown.
In this NIS server/slave mode, the NIS server is a standard stand alone con-
figuration except that it must have NETSERVER on in the configuration
file and have an NISPORT nnn defined. Thus any apcupsd running in
this mode then becomes the NIS server.
The NIS slave then uses the net driver to connect to the server’s NIS output.
In this mode, the NIS slave decides how often to poll the server for the
NIS information. The NIS slave’s conf file has UPSTYPE net, which
will invoke the “network” driver. By setting this machine’s DEVICE to be
server-ip:server-NIS-port it will automatically connect to the NIS server
and use the server’s signals to shutdown the computer. In the example net
slave configuration file below, the slave uses the NIS information provided
by the computer tibs on port 3551.
## apcupsd.conf v1.1 ##
UPSCABLE ether
UPSTYPE net
# Specify the server name:port where NIS is running
DEVICE tibs:3551
LOCKFILE /var/lock
BATTERYLEVEL 5
MINUTES 3
TIMEOUT 0
ANNOY 300
ANNOYDELAY 60
NOLOGON disable
EVENTSFILE /etc/apcupsd/apcupsd.events
UPSCLASS standalone
UPSMODE disable
#
# Use this to control the poll time.
# the default is 60 or 1 minute
#
NETTIME 30
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