Overview
What is Nagios?
Nagios XI uses the Nagios Core monitoring engine and adds a web interface, wizards, dashboards and reporting. Product choice matters: a Core deployment and an XI deployment have different setup and support expectations.
Read the full overview
Sources checked 27 September 2026: Nagios XI, Core versus XI.
NagiosNetwork ManagementChecks and alerts for infrastructure health
Open sourceSelf-hostedFreemium
Key capabilities
- Host and service checks: Observe availability and selected health signals.
- Alerts: Notify owners when checks change state.
- XI operations: Use its interface and reporting where that product is selected.
API access Open-source code Self-hosted deployment Web
A good pilot includes a real outage simulation and confirms that the alert arrives, has context and clears after recovery.
“Checks and alerts for infrastructure health”
Technical details
- Access
- Self-hosted
- Source model
- Open source
- Founded
- 1999
- Pricing model
- Freemium
- API
- Available
- Website
- www.nagios.org ↗
- GitHub
- Source repository ↗
What to verify
Start from the users, systems and operating responsibilities the tool needs to support.
- Confirm current features, licensing and support terms.
- Validate deployment, data location and access control.
- Test integrations, exports and recovery workflows.
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