Nagios Core
The facts below are what the maker publishes about Nagios Core, checked and dated. Our editors have not written about it yet.
Plans and prices
From Nagios Core's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Nagios Core | Free | No node limitations · Open source under GPL v2 · Manual text-file configuration |
The facts
Each one read from Nagios Core's own pages, with the date it was checked.
What it does
- Alerts and automation
- It supports configurable notifications, escalation paths, notification dependencies, event handlers, service recovery actions, and maintenance scheduling.checked 4 Oct 2026
- Configuration limit
- Core uses text-based configuration files and does not include the configuration wizards listed for Nagios XI.checked 4 Oct 2026
- Extensibility
- Its plugin system supports custom checks, plugins written in languages such as Bash, Python, Perl, C, and PHP, and remote execution through NRPE or SSH.checked 4 Oct 2026
- Host monitoring
- It monitors processor load, disk usage, memory, processes, and other system resources on Linux, Unix, and Windows hosts.checked 4 Oct 2026
- Integrations
- The features page names Grafana, InfluxDB, Prometheus, PagerDuty, Slack, and ServiceNow among its integration options.checked 4 Oct 2026
- Intended users
- The maker describes Core as suited to IT professionals comfortable with command-line configuration who want control without licensing costs.checked 4 Oct 2026
- Network monitoring
- It can check network services and protocols including SMTP, POP3, HTTP, NNTP, ICMP, SNMP, FTP, SSH, TCP, and UDP.checked 4 Oct 2026
- Purpose
- Nagios Core monitors IT infrastructure including servers, network devices, websites, applications, services, and custom metrics.checked 4 Oct 2026
- Requirements
- The product page specifies a Linux-based operating system and lists Ubuntu, CentOS, Debian, and Red Hat Enterprise Linux versions as supported distributions.checked 4 Oct 2026
- Security updates
- The 4.5.14 changelog lists fixes for vulnerabilities in notification macros, jsonquery.js, cmd.cgi, and the CSRF cookie.checked 4 Oct 2026
- Support
- The product page lists community forums, documentation, manuals, a quick-start guide, FAQs, and video tutorials as Core resources.checked 4 Oct 2026
- Web interface and data
- Nagios Core includes a CGI web interface and exposes status files, external commands, performance data, and an event broker module interface.checked 4 Oct 2026
The company
- Company history
- Nagios says Ethan Galstad began the open-source Nagios Core engine in 1999.checked 4 Oct 2026
Alternatives to Nagios Core
- 1
Checkmk
Free planOpen sourceAndroidiOSWebAPI8.8From $275 a month - 2
Centreon
Free planOpen sourceWebAPILinuxSelf-hosted8.3From €2.27 a year - 3
ManageEngine OpManager
Free planAndroidiOSWebAPI8.3From $95 a year - 4
Obkio
Free planAndroidiOSWebAPI8.2From $249 a month - 5
Nagios XI
Free planWebAPILinuxmacOS8.1$2,595 one-time - 6
Paessler PRTG Network Monitor
Free planAndroidiOSWebAPI7.7From $200 a month