"Monitoring and analyzing masses of information--Is the CPU
overloaded? Is the network interface saturated?--across several
hosts is a daunting task. A good solution might be only a few steps
away, though! The open source Nagios project (see Resources) solves
complex monitoring and notification requirements quite handily.
"Crucial to understanding Nagios is that, rather than monitor
and track 'natural' measurements such as CPU utilization, the tool
reduces all information to 'working,' 'questionable,' and 'failure'
states. This helps operators focus on the most important and
crucial problems, based on predefined and configurable