Icinga takes open source monitoring to the next level.

Icinga is a monitoring software project that began as a fork of Nagios. The Icinga Project maintains two branches in parallel: Icinga 1 and Icinga 2.

Icinga 1 and Icinga 2 are enterprise-grade open source monitoring systems that keep watch over a network and any conceivable network resource, notify users of errors and recoveries, and generate performance data for reporting.

Though both are scalable and extensible, Icinga 2 is designed to monitor complex, large environments across dispersed locations out-of-the-box.

All software written by the Icinga Project is licensed under GPL V2 – free to use, distribute and modify.


  • Monitoring of network services (SMTP, POP3, HTTP, NNTP, ping, etc.)
  • Monitoring of host resources (CPU load, disk usage, etc.)
  • Monitoring of server components (switches, routers, temperature and humidity sensors, etc.)
  • Simple plug-in design that allows users to easily develop their own service checks
  • Parallelized service checks
  • Ability to define network host hierarchy using “parent” hosts, allowing detection of and distinction between hosts that are down and those that are unreachable
  • Ability to define event handlers to be run during service or host events for proactive problem resolution


  • Notification of contact persons when service or host problems occur and get resolved (via email, pager, or user-defined method)
  • Escalation of alerts to other users or communication channels
  • Mobile phone App and Desktop plugins

Visualisation & Reporting

  • Two optional user interfaces (Icinga Classic UI and Icinga Web) for visualization of host and service status, network maps, reports, logs, etc.
  • Icinga Reporting module based on open source Jasper Reports for both Icinga Classic and Icinga Web user interfaces
  • Template based reports (e.g. Top 10 problematic hosts or services, synopsis of complete monitoring environment, availability reports, etc.)
  • Report repository with varying access levels and automated report generation and distribution
  • Optional extension for SLA reporting that distinguishes between critical events from planned and unplanned downtimes and acknowledgement periods
  • Capacity utilization reporting
  • Performance graphing via add-ons such as PNP4Nagios, NagiosGrapher and InGraph
  • Nagstamon linux desktop open source monitoring app.
  • ANag Android mobile phone open source monitoring app.