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Nagios, 2nd Edition by Wolfgang Barth

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B.2 Flap Detection for Hosts

Nagios tries to detect changing states of a host in two ways: in the host check itself (either in the context of the active check from Nagios 3.0 or in on-demand checks), and also if a service check for a host was performed, the last flap detection of which took place some time ago. When Nagios next performs a service check to detect a changing state is determined by the average value for all service check intervals.

Regular host checks are also not necessary from Nagios 3.0 onward, and recent versions of Nagios manage perfectly well without them. For reasons of performance, they really should be avoided in Nagios 2.x (4.2 On-Demand Host Checks vs. Periodic Reachability Tests, page 95). By making use of a trick to perform ...

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