Process:
aptitude install nagios-nrpe-server nagios-plugins-basic
vim /etc/nagios/nrpe.cfg
service nagios-nrpe-server restart
netstat -tpln | grep 5666
vim /etc/nagios/nrpe_local.cfg
in this instance I'm adding disk checks for all the disks
0 octavia:/etc/nagios# cat nrpe_local.cfg ###################################### # Do any local nrpe configuration here ###################################### command[check_nrpe_daemon]=/bin/echo "NRPE OK" # disk checks command[check_disk_root]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/mapper/vg_octavia0-root command[check_disk_tmp]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/mapper/vg_octavia0-tmp command[check_disk_var]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/mapper/vg_octavia0-var command[check_disk_mysql]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/mapper/vg_octavia0-var+lib+mysql command[check_disk_home]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/mapper/vg_octavia0-home
http://xmodulo.com/2014/03/nagios-remote-plugin-executor-nrpe-linux.html
https://wiki.icinga.org/display/howtos/Setting+up+NRPE+with+Icinga