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CHAPTER 9: POWER, ENVIRONMENT AND DIGITAL I/O
Check Enable Shutdown Script if this remote UPS is the UPS providing power to the console server itself. If the UPS reaches critical
battery status the custom script in /etc/config/scripts/ups-shutdown is run enabling you to perform any “last gasp” actions.
Click Apply.
NOTE: The Remote UPS feature is supported on all console servers running firmware v2.8 and later. Earlier versions supported a single
remote monitored UPS that could be set to trigger the console server shutdown script.
9.2.3 CONTROLLING UPS-POWERED COMPUTERS
One of the advantages of having a Managed UPS is that you can configure computers that draw power through that UPS to shut down
gracefully in case of UPS problems.
For Linux computers, this can be done by setting up upsmon on each computer and directing them to monitor the console server that is
managing their UPS.
This will set the specific conditions that will be used to initiate a power down of the computer. For example, non-critical servers may
be powered down some seconds after the UPS starts running on battery where more critical servers may not be shut down until a low
battery warning is received. Refer to the online NUT documentation for details on how this is done:
http://eu1.networkupstools.org/doc/2.2.0/INSTALL.html
http://linux.die.net/man/5/upsmon.conf
http://linux.die.net/man/8/upsmon
An example upsmon.conf entry might look like:
MONITOR [email protected] 1 username password slave
TABLE 9-1. UPSMON.CONF
UPSMON.CONF PORTION
DESCRIPTION
manageup
The UPS Name of the managed UPS.
192.168.0.1
The IP address of the Black Box console server.
1
Indicates the server has a single power supply attached to this UPS.
username
The username of the managed UPS.
password
The password of the managed UPS..
There are NUT monitoring clients available for Windows computers (for example, WinNUT).
If you have an RPC (PDU) it is also possible to shut down UPS-powered computers and other equipment without them have a client
running (for example, communications and surveillance gear). Set up a UPS alert and use this to trigger a script that controls a PDU to
shut off the power (see Chapter 16).
9.2.4 UPS ALERTS
Set UPS alerts using Alerts & Logging > Alerts. See Chapter 8.