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Nagios, 2nd Edition by Wolfgang Barth

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Chapter 13. Passive Tests with the External Command File

Apart from active service and host checks, Nagios also makes use of passive tests (and combinations of both types of test). While the system itself defines the time for active checks when they are performed, and then initiates them, Nagios in passive mode only processes incoming results.

For this to work, an interface is required that allows test results from the outside to be passed on to Nagios, as well as commands that perform checks and feed in the results through the interface. Normally remote hosts send their test results, determined by shell scripts, via the Nagios Service Check Acceptor (NSCA), which is introduced in the next chapter (Chapter 14), to the Nagios server.

Passive checks ...

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