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.

What is Nagios and how it works?

Nagios Core /ˈnɑːɡiːoʊs/, formerly known as Nagios, is a free and open-source computer-software application that monitors systems, networks and infrastructure. Nagios offers monitoring and alerting services for servers, switches, applications and services.

What are the main benefits of Nagios?

Implementing effective server monitoring with Nagios offers the following benefits:

• Increased server, services, process, and application availability.
• Fast detection of network and server outages and protocol failures.
• Fast detection of failed servers, services, processes and batch jobs.