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EnglishWhere to Start on nagios.org to Get Nagios
Updated
Start with the "Get Started Free" entry point on nagios.org if you want the open source offering — that is the site's own call to action for getting Nagios Core. If you already run Nagios Core and want the supported, commercial platform, go to the CSP Upgrade link instead. The rest of the homepage is organized around what Nagios monitors, why people choose it, related open source projects, and community resources.
The two main starting points
The homepage presents two distinct paths, and picking the right one depends on whether you want the free open source tool or the commercial services platform.
| Your goal | Where to go | What it leads to |
|---|---|---|
| Download and run the free, open source monitoring tool | "Get Started Free" | Nagios Core, the GPL-licensed, self-hosted monitoring engine |
| Move from Core to the supported commercial platform | "CSP Upgrade" (nagios.org/upgrade/) | Nagios Core Services Platform |
The site describes Nagios Core as free, open source IT monitoring that is self-hosted and GPL licensed, with more than 25 years of history. The "Get Started Free" button is the entry point the site itself provides for that open source offering.
What Nagios monitors, so you know if it fits
Before downloading, confirm the tool covers what you need to watch. The site lists monitoring across:
- Servers — device health, service availability, and performance
- Networks — the same active polling across network devices
- Applications — application-level availability and performance
- Cloud — cloud platforms alongside the rest of your infrastructure
- Databases — included in the same active-polling scope
The mechanism the site names is active polling: Nagios checks device health, service availability, and performance rather than waiting for something to report in. If your environment matches these categories, the open source path is the natural starting point.
Popular Open Source Projects
The homepage has a "Popular Open Source Projects" section. This is where you look if you want the related tools in the Nagios ecosystem rather than only the core monitoring engine. Treat it as the index for the broader open source family before you commit to a single download.
Community and support
A "The Power of Community" section points to community resources for support and project information. This is the place to go after you have the software and need help, plugins, or project context — rather than a sales or upgrade path.
A practical order of operations
- Confirm fit — check the "What Nagios Has Solutions For" list against your servers, networks, applications, and cloud platforms.
- Choose your edition — open source via "Get Started Free," or the commercial platform via "CSP Upgrade."
- Explore related tools — browse "Popular Open Source Projects" if you need more than the core engine.
- Get help — use the community resources when you are running it and need support.
The single most common wrong turn is heading straight for the upgrade page when you actually want the free open source tool, or vice versa. Decide which of the two you are before clicking either.