Nagios

Nagios builds industry-leading monitoring solutions that help organizations ensure the health, performance, and reliability of their IT infrastructure. With Nagios monitoring tools, you can proactively detect issues, receive instant Nagios alerts, and maintain optimal performance across servers, networks, applications, and critical services. Nagios began in 1999, when Ethan Galstad developed the open-source Nagios Core engine for IT infrastructure monitoring. What started as a solution to monitor network services has evolved into the world’s most trusted monitoring platform. Today, Nagios Enterprises sponsors and supports the open-source monitoring tool while offering commercial products that extend the power of Naigos Core with advanced visualization, automation, reporting, and enterprise governance. Our mission is to make IT environments more stable, more predictable, and easier to manage for teams of all sizes. Open source means open collaboration. From plugins to full-scale integrations, the Nagios Community powers innovation and reliability across IT infrastructures worldwide. Join the conversation, share your expertise, and help shape the future of open-source monitoring. The monitoring engine that started it all. Monitor websites, servers, switches, routers, firewalls, ports, applications, metrics, and more. Monitor Windows, Linux, and Mac in real time. NCPA is a cross-platform agent for servers, system metrics, applications, and networks. 50+ ready-made checks packaged with Nagios including check ping, check ssh, check cpu, check memory, check linux, and more. Adds scalability and performance to Nagios Core, enabling users of Nagios Core and XI to effectively monitor large environments. Web UIs, auto-discovery scripts & change management interfaces to simplify Nagios configuration without manual file editing. Transform Nagios data into dashboards, network maps & performance graphs for intuitive monitoring and business insights.

Nagios is a host/service/network monitoring program written in C and released under the GNU General Public License, version 2. CGI programs are included to allow you to view the current status, history, etc via a web interface if you so desire. Visit the Nagios homepage at for documentation, new releases, bug reports, information on discussion forums, and more. Monitoring of network services (via SMTP, POP3, HTTP, PING, etc). Monitoring of host resources (processor load, disk usage, etc.). A plugin interface to allow for user-developed service monitoring methods. Ability to define network host hierarchy using "parent" hosts, allowing detection of and distinction between hosts that are down and those that are unreachable. Notifications when problems occur and get resolved (via email, pager, or user-defined method). Ability to define event handlers for proactive problem resolution. Automatic log file rotation/archiving. Optional web interface for viewing current network status, notification and problem history, log file, etc. See the Changelog for a summary of important changes and fixes, or the commit history for more detail. Quickstart installation guides are available to help you get Nagios up and monitoring. Patches and GitHub pull requests are welcome. Pull requests on GitHub link commits in version control to review and discussion of the changes, helping to show how and why changes were made, in addition to who was involved. Created by Ethan Galstad, the success of Nagios has been due to the fantastic community members that support it and provide bug reports, patches, and great ideas. See the THANKS file for some of the many who have contributed since 1999.