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Monitoring objects and services

When it comes to Networked device monitoring with Nagios one should know, what they want to monitor
below is a simple table which defines Monitoring categories.

Category

Description

Availability

If a System is reachable (Ping) or a server is available (HTTP tcp port 80)

Environmental

In this category, you monitor Temperature, Humidity, Camera (Office, Machine room), etc

Funtionality

HTTP tcp port is responding doesn't mean that the server is also delivering pages, hence you should also do content checks

Usability

CPU, Memory, Disk or Network usage are some examples

Nagios flexibility allows one to integrate different methods to do active and passiv checks