To install Nagios on Ubuntu 24.04, you gain access to Nagios Core, an open-source tool that monitors networks, services, and applications using the Nagios Remote Plugin Executor (NRPE). The NRPE agent utilizes a server/agent architecture to communicate with remote hosts and monitor metrics such as disk usage, CPU load, and network activities. Nagios periodically tracks the resources of remote hosts and displays detailed reports on a web dashboard. This article explains how to install Nagios on U......