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Learning Nagios - Third Edition by Piotr Beltowski, Wojciech Kocjan

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Monitoring using NRPE

NRPE is a client-server solution for running check commands on remote computers. It is designed explicitly to allow the central Nagios server to trigger checks on other machines in a secure manner.

NRPE offers a very good security mechanism along with encryption mechanisms. It is possible to specify a list of machines that can run checks via NRPE and which plugins can be run along with aliases that should be used by the central Nagios server.

The main difference is that the communication overhead is much smaller than for running checks over the SSH protocol. This means that both the central Nagios server and the remote machine need less CPU time to perform a check. This is mainly important for Nagios servers that deal with ...

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