[ Thanks to jmalasko for this link.
]
“In this article, I focus on Nagios, an open source
host, service, and network monitoring program for your Ajax
applications. I discuss how you can quickly install and start
Nagios, access CGIs, and monitor hosts and services. I also show
you how you can monitor redundancy and failover, detect and handle
state flapping, and solve security and performance
issues.”