What Is Nagios?

Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.



First launched in 1999, Nagios has grown to include thousands of
projects developed by the worldwide Nagios community. Nagios
is officially sponsored by Nagios Enterprises, which supports
the community in a number of different ways through sales
of its commercial products and services.
Nagios Logo Black

Nagios monitors your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning properly. In the event of a failure, Nagios can alert technical staff of the problem, allowing them to begin remediation processes before outages affect business processes, end users, or customers. With Nagios, you’ll never be left having to explain why an unseen infrastructure outage hurt your organization’s bottom line.


Discover What Nagios Can Do for You.

Learn how it works. See how implementing Nagios in your IT infrastructure can greatly improve incident response time, reduce system downtime, and increase network and server health in this Nagios Overview.

Implement in Nearly
Any Environment.


The many features and capabilities that Nagios provides make it easy to implement in nearly any environment. See what features and capabilities Nagios has to offer.

Open-source Community

A huge community of supporters and contributors is what makes Nagios great. With millions of users worldwide and thousands of plugins and add-ons, the Nagios Community is a strong asset for any support or development needs you might have.


There are thousands of Nagios projects that can be used to build the perfect monitoring solution. Learn more about our Nagios Projects on the Projects page.


One thing that allows Nagios to continually improve is the vast network and community involved in development of plugins, contributions to the Core monitoring engine, and advanced visualizations. If you’re a Nagios super-user, share your knowledge with the community!