Installing Nagios Core on Ubuntu using google cloud 

Nagios Core -
Installing Nagios Core on Ubuntu using google cloud within 10minute
#Nagios_Core
#monitoring_tools_nagios
Nagios provides complete monitoring of Linux operating systems and distributions - including operating system metrics, service state, process state, file system usage, and more. When you use Nagios to monitor your Linux environment, you're using one of the most powerful Linux monitoring tools on the planet.
===== Ubuntu 18.x =====
sudo apt-get update
sudo apt-get install -y autoconf gcc libc6 make wget unzip apache2 php libapache2-mod-php7.2 libgd-dev
Downloading the Source
cd /tmp
wget -O nagioscore.tar.gz github.com/Nag...
tar xzf nagioscore.tar.gz
Compile
cd /tmp/nagioscore-nagios-4.4.5/
sudo ./configure --with-httpd-conf=/etc/apache2/sites-enabled
sudo make all
Create User And Group
sudo make install-groups-users
sudo usermod -a -G nagios www-data
nstall Binaries
sudo make install
Install Service / Daemon
sudo make install-daemoninit
Install Command Mode
sudo make install-commandmode
Install Configuration Files
sudo make install-config
Install Apache Config Files
sudo make install-webconf
sudo a2enmod rewrite
sudo a2enmod cgi
Configure Firewall
sudo ufw allow Apache
sudo ufw reload
Create nagiosadmin User Account
sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Installing The Nagios Plugins
Prerequisites
sudo apt-get install -y autoconf gcc libc6 libmcrypt-dev make libssl-dev wget
bc gawk dc build-essential snmp libnet-snmp-perl gettext
Downloading The Source
cd /tmp
wget --no-check-certificate -O nagios-plugins.tar.gz github.com/nag...
tar zxf nagios-plugins.tar.gz
Compile + Install
cd /tmp/nagios-plugins-release-2.2.1/
sudo ./tools/setup
sudo ./configure
sudo make
sudo make install
sudo systemctl start nagios.service
sudo systemctl stop nagios.service
sudo systemctl restart nagios.service
sudo systemctl status nagios.service
help url:
support.nagios...
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