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Nagios Core

nagios.org

Free plan LinuxAPISelf-hosted
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Spec score 7.7 #17 of 25 in Network Monitoring - Midmarket Software

Spec sheet

Purpose
Nagios Core monitors IT infrastructure including servers, network devices, websites, applications, services, and custom metrics.Read 4 Oct 2026 · nagios.org
Intended users
The maker describes Core as suited to IT professionals comfortable with command-line configuration who want control without licensing costs.Read 4 Oct 2026 · nagios.org
Integrations
The features page names Grafana, InfluxDB, Prometheus, PagerDuty, Slack, and ServiceNow among its integration options.Read 4 Oct 2026 · nagios.org
Support
The product page lists community forums, documentation, manuals, a quick-start guide, FAQs, and video tutorials as Core resources.Read 4 Oct 2026 · nagios.org
Alerts and automation
It supports configurable notifications, escalation paths, notification dependencies, event handlers, service recovery actions, and maintenance scheduling.Read 4 Oct 2026 · nagios.org
Company history
Nagios says Ethan Galstad began the open-source Nagios Core engine in 1999.Read 4 Oct 2026 · nagios.org
Configuration limit
Core uses text-based configuration files and does not include the configuration wizards listed for Nagios XI.Read 4 Oct 2026 · nagios.org
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.Read 4 Oct 2026 · nagios.org
Host monitoring
It monitors processor load, disk usage, memory, processes, and other system resources on Linux, Unix, and Windows hosts.Read 4 Oct 2026 · nagios.org
Network monitoring
It can check network services and protocols including SMTP, POP3, HTTP, NNTP, ICMP, SNMP, FTP, SSH, TCP, and UDP.Read 4 Oct 2026 · nagios.org
Requirements
The product page specifies a Linux-based operating system and lists Ubuntu, CentOS, Debian, and Red Hat Enterprise Linux versions as supported distributions.Read 4 Oct 2026 · nagios.org
Security updates
The 4.5.14 changelog lists fixes for vulnerabilities in notification macros, jsonquery.js, cmd.cgi, and the CSRF cookie.Read 4 Oct 2026 · nagios.org
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.Read 4 Oct 2026 · nagios.org

Plans and prices

Nagios Core Free No node limitations · Open source under GPL v2 · Manual text-file configuration Read 4 Oct 2026 · nagios.org

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