Using Nagios with NRPE
To perform service checks over NRPE is made much easier by utilizing Puppet to push your configs and restart the nrpe daemon.
Examples
check_nrpe command invoked from command line
check_zombie_procs...
./check_nrpe -H hostname -c check_zombie_procs
check for a specific process
./check_nrpe -H hostname -c check_proc -a puppetd