About Nagios
Nagios is a long-running open source monitoring system for servers, networks, applications and services. The Nagios Core engine checks each host and service and sends alerts when something fails.
What it does
Nagios runs checks on a schedule and records the results. When a check fails, it can alert the people responsible. Monitoring is extended with plugins that test ports, websites, applications and devices such as switches, routers and firewalls.
Key features
- Checks for websites, ports, servers and network devices
- Thousands of plugins and add-ons
- NCPA agent for Windows, Linux and Mac hosts
- Log monitoring through a separate log server
- Network traffic analysis from NetFlow and sFlow data
Who it's for
System administrators and IT teams that want a proven, self-hosted monitoring system. It suits teams that prefer a tool they can extend with their own checks.
Pricing and good to know
Nagios Core is free and open source under the GPL-2.0 license. Commercial products such as Nagios XI and Nagios Log Server are offered on the same site. Setup takes some effort, because the core is configured through text files.
Highlights
- Checks for websites, ports, servers and network devices
- Thousands of plugins and add-ons
- NCPA agent for Windows, Linux and Mac hosts
- Log monitoring through a separate log server
- Network traffic analysis from NetFlow and sFlow data
