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Learning Nagios - Third Edition by Piotr Beltowski, Wojciech Kocjan

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Chapter 10. Monitoring Remote Hosts

Nagios offers various ways of monitoring computers and services. The previous chapter talked about passive checks and how they can be used to submit results to Nagios. It also discussed NRDP, which can be used to send check results from other machines to the Nagios server.

This chapter talks about another approach to check the service status. It uses Nagios active checks that run the actual check commands on different hosts. This approach is most useful in cases where resources local to a particular machine are to be checked, such as monitoring disk and memory usage as well as checking if your operating system is up to date. This type of data cannot be checked without running commands on the target computer. ...

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