![]() Two Ubuntu 18.04 servers set up by following our Initial Server Setup Guide for Ubuntu 18.04, including a non-root user with sudo privileges and a firewall configured with ufw.You’ll also set up the Nagios Remote Plugin Executor (NRPE), which runs as an agent on remote hosts so you can monitor their resources. In this tutorial, you’ll install Nagios 4 and configure it so you can monitor host resources via Nagios’ web interface. ![]() Using a monitoring system like Nagios is an essential tool for any production environment, because by monitoring uptime, CPU usage, or disk space, you can head off problems before they occur, or before your users call you. ![]() It keeps an inventory of your servers and monitors them so you know your critical services are up and running. Nagios is a popular open-source monitoring system. The author selected the Open Source Initiative to receive a donation as part of the Write for DOnations program.
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