Code in this video: How to Install and Configure Nagios Core Server on Ubuntu 23 | 22.04 LTS | 21 | 20.04 LTS | 18.04 LTS
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sudo apt install -y autoconf bc gawk dc build-essential gcc libc6 make wget unzip apache2 php libapache2-mod-php libgd-dev libmcrypt-dev make libssl-dev snmp libnet-snmp-perl gettext
sudo wget https://assets.nagios.com/downloads/nagioscore/releases/nagios-4.4.13.tar.gz
sudo ./configure --with-httpd-conf=/etc/apache2/sites-enabled
sudo make install-groups-users
sudo usermod -a -G nagios www-data
sudo make install
sudo make install-daemoninit
sudo make install-init
sudo make install-commandmode
sudo make install-config
sudo make install-webconf
sudo a2enmod rewrite cgi
sudo apt install monitoring-plugins nagios-nrpe-plugin -y
$USER1$=/usr/lib/nagios/plugins
define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}