10.2 Starting via the inet Daemon
It is best to start the program nrpe on the machine to be monitored via the inet daemon rather than as a separate daemon, since the Nagios server only performs the tests occasionally, and nrpe does not need to load any large resources.
If you have a choice, you should use the more modern xinetd. But to keep work to a minimum, the inet daemon will normally be used, as it is already running on the target system. In order that NRPE can be started as a service via inetd or xinetd, the nrpe service is defined in the file /etc/services:
nrpe 5666/tcp # Nagios Remote Plugin Executor NRPE
Even if this has been installed as a package, you should still check to see whether this entry exists. By default, NRPE uses TCP port ...
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