#### a> Purpose
The NRPE addon is designed to allow you to execute Nagios plugins on remote Linux/ Unix machines. The
main reason for doing this is to allow Nagios to monitor" local" resources( like CPU load, memory usage,
etc.> on remote machines. Since these public resources aren't generally exposed to external machines, an
agent like NRPE must be installed on the remote Linux/ Unix machines.
Note It's possible to execute Nagios plugins on remote Linux/ Unix machines through SSH. There's a
plugin that allows you to do this. Using SSH is more secure than the NRPE addon, but it also
imposes a larger( CPU> overhead on both the monitoring and remote machines. This can become an issue
when you start monitoring hundreds or thousands of machines. numerous Nagios admins conclude for using the
NRPE addon because of the lower load it imposes.
#### b> Design Overview