1. Overview

smupsd monitors an APC Smart-UPS[TM] under Red Hat[TM] Linux 5.0. Should power fail, smupsd will power down the system and the UPS in an orderly fashion.

smupsd has the following features:

• Shuts down the system and the UPS based on either remaining UPS battery charge or elapsed time since power failure.
• UPS parameters can be monitored live from any host with the graphical monitor program upsmon, written in Java[TM].
• UPS parameters can be logged to a file for analysis and reporting.
• When additional systems share the same UPS, instances of smupsd running on these systems can read UPS parameters from the one running on the system serially connected to the UPS (master/slave).
• Network access from remote hosts can be controlled via the /etc/hosts.allow file.