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Nagios, 2nd Edition by Wolfgang Barth

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Chapter 9. Executing Plugins via SSH

Local plugins, that is, programs that only run tests locally because there are no network protocols available, must be installed on the target system and started there. They check processes, CPU load, or how much free hard disk capacity is still available, among other things.

But if you still want to execute these plugins from the Nagios server, it is recommended that you use the secure shell, especially if any kind of Unix system is installed on the machine to be tested—a Secure Shell daemon will almost always be running on such a target system, and you do not require any special permissions to run most plugins. The Nagios administrator needs nothing more than an account, which he can use from the Nagios server. ...

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