HowTo manually configure UPS support in Linux

From SIPfoundry sipx, The Open Source SIP PBX for Linux - Calivia

Here’s a good link on using nut (ups monitoring software for Linux): http://fedoranews.org/contributors/kazutoshi_morioka/nut/

Also, the nut project page: http://www.networkupstools.org/

Functionality seems to be dependent a bit on what Vendor / Model of UPS you are utilizing but at a minimum a clean system shutdown will be had.

Steps:

 The following example is for a Liebert PowerSure UPS
 
 Connect UPS Serial cable to COM1:
 Login to the server as root.
 Install nut and the nut client ‘yum –y install nut nut-client’
 Edit /etc/sysconfig/ups ‘nano –w /etc/sysconfig/ups’
 Find ‘MODEL=’ line and set to ‘MODEL=liebert’
 Find ‘DEVICE=’ line and set to ‘DEVICE=/dev/ttyS0’   or use ttyS1 for COM2:
 Save file ‘Ctl-X, y’
 Set proper file permissions because the install doesn’t.
 Cd /etc/ups
 Chown root:nut ups*
 Chmod 640 ups*
 Edit /etc/ups/ups.conf ‘nano –w /etc/ups/ups.conf’
 Make the following entries in the conf file:
 [liebert]
           driver = liebert
           port = /dev/ttyS0                (or ttyS1 for COM2:)
           sdtype = 0
 Edit /etc/ups/upsd.users ‘nano –w /etc/ups/upsd.users’
 Make the following entries in the users file:
 [monuser]
 password = YourFavPasswd
 allowfrom = localhost
 upsmon master
 Edit /etc/ups/upsmon.conf ‘nano –w /etc/ups/upsmon.conf’
 Make the following line in the conf file:
 MONITOR liebert@localhost 1 monuser YourFavPasswd master
 Start upsd ‘/etc/init.d/ups start