Monitoring (Nagios)

https://www.digitalocean.com/community/tutorials/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-16-04

Debian Client installation

sudo useradd nagios
sudo apt-get update
sudo apt-get install build-essential libgd2-xpm-dev openssl libssl-dev unzip
cd ~
curl -L -O http://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
tar zxf nagios-plugins-*.tar.gz
cd nagios-plugins-*