Nagios is an open source IT monitoring framework for networks, servers, and services, with a vast plugin ecosystem.
About
Nagios is one of the most established open source IT infrastructure monitoring frameworks in the world, with a heritage dating back to 1999. Used by hundreds of thousands of organizations globally, Nagios provides comprehensive monitoring of networks, servers, applications, and services, with an extensible plugin architecture that has built one of the largest communities in open source monitoring history.
Nagios Core is the foundational open source monitoring engine that powers the Nagios ecosystem. The core scheduling daemon checks the status of network services, host states, and custom metrics at configurable intervals, generating alerts when conditions deviate from expected baselines. Its flexible notification system supports email, SMS, paging, and custom notification scripts, with escalation policies ensuring the right people are alerted based on severity and time-of-day rules.
Nagios XI is the commercial enterprise version, providing a user-friendly web interface, automated configuration wizards, advanced reporting capabilities, and enterprise support on top of the Nagios Core engine. Nagios XI's Quick Configuration Wizards simplify adding new monitoring targets for Windows and Linux servers, Cisco routers, VMware ESXi hosts, and popular databases.
The Nagios Plugin ecosystem contains thousands of community-developed plugins for monitoring virtually every technology in a modern IT environment. Plugins can check anything from server CPU and memory to website response times, database performance, SSL certificate expiration, and custom business logic metrics. The Nagios Exchange provides a centralized repository for discovering and sharing plugins and addons contributed by the global community.
Nagios Log Server provides centralized log management and correlation capabilities that complement infrastructure monitoring. Nagios Network Analyzer delivers NetFlow analysis and bandwidth monitoring for network capacity planning. Together, these products form a comprehensive open source monitoring ecosystem that organizations deploy on their own infrastructure with full control over data retention, privacy, and customization.
Positioning
Nagios provides nagios is an open source it monitoring framework for networks, servers, and services, with a vast plugin ecosystem.
As an open source project, Nagios gives teams full transparency and control over their tooling. There are no licensing costs and no vendor lock-in — the source code is available for inspection, modification, and self-hosting.
What You Get
- API Access
Integrate Nagios with your existing tools and workflows through a well-documented API - Open Source
Full access to source code for transparency, customization, and community contributions - Web Platform
Access Nagios from any browser with a responsive, modern interface - Professional Support
Access documentation, community forums, and professional support options - Regular Updates
Benefit from continuous improvements and security patches
Core Areas
API & Integration
A comprehensive API enables automation and integration with third-party tools and custom workflows.
Open Source Community
An active open source community contributes plugins, extensions, and improvements to the platform.
Operations
Nagios helps teams streamline their operational workflows and reduce manual overhead.
Why It Matters
Nagios addresses a real need in the IT landscape: nagios is an open source it monitoring framework for networks, servers, and services, with a vast plugin ecosystem.
Founded in 1999, Nagios has proven its reliability over years of production use. Longevity in the technology industry is a strong signal of product quality and sustained value.
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