In this tutorial, we’ll show you how to install Icinga 2, Icinga Web 2 and all the required components on a Debian 9 VPS.
Icinga 2 is a modern open-source network monitoring application which can be used to monitor the network infrastructure and check the health of servers and their services. Icinga 2 is a branch of Nagios rewritten from scratch in C++. It is backwards-compatible with all existing Nagios plugins, add-ons, and the Nagios user interface. Icinga 2 has a user-friendly web interface, but it also comes with a command line interface that can be used to monitor networks, servers and services with specific commands.