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Nagios Core

Industry classic host and service monitoring engine

Monitoring & Status ★ 2k stars Hard setup GPL-2.0

Nagios Core is the open-source monitoring engine that watches hosts, services, and network devices, alerting when problems occur. It is highly extensible through plugins and remains a long-standing standard in IT monitoring.

Official siteSource code

Key features

  • Host and service checks
  • Massive plugin ecosystem
  • Flexible notification rules
  • Proven at scale

Pros & cons

Strengths

  • Battle-tested and stable
  • Enormous plugin library

Trade-offs

  • Configuration is text-file heavy
  • Dated web interface

Nagios Core replaces

Self-hosted SolarWinds alternativesSelf-hosted PRTG alternatives

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