Chapter 7. Service Monitoring
Overview of Service Monitoring
The most common type of problem that network administrators deal with is something that spontaneously stops working: A network link fails, a Web server refuses connections, or a switch stops passing traffic. Often, failures like these do not result in any kind of notification to administrators. A switch that loses power or suffers a software failure does not have any way of sending a message indicating that it is no longer functioning. It is is vital, however, for administrators to be notified of failures like this when they occur.
The solution is to use some kind of monitoring or polling software. This is a program running on one or more servers that sends out probes at regular intervals ...