После установки Nagios Core, начинаю устанавливать Nagios Plugins:
monitor ~ # mkdir -p /usr/local/src/nagios-plugins
monitor ~ # cd /usr/local/src/nagios-plugins
monitor ~ # wget http://nagios-plugins.org/download/nagios-plugins-2.0.2.tar.gz
monitor ~ # tar -xf nagios-plugins-2.0.2.tar.gz
monitor ~ # cd nagios-plugins-2.0.2
monitor ~ # ./configure --with-nagios-user=nagios --with-nagios-group=nagios --with-openssl=/usr/bin/openssl --enable-perl-modules --enable-libtap
monitor ~ # make
monitor ~ # make install