Upsilon Project Homepage

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Upsilon is a distributed, flexible and extensible system monitoring application.

free disk space, DNS records, domain name expiry, MySQL Databases, ping times and any many more, including thousands of existing nagios checks. Create your own in any programming language using the service check API.

Distributed: You run service checks on Upsilon nodes in your network where it makes sense. Either on every server, on a management network, inside or outside the firewall. You can run checks on secure, hard to reach networks and push those results to a central server. You can optionally run execute "agentless" checks just by using SSH.

Flexible: If you can script it, you can monitor it. It is as simple as that. Unlike most monitoring systems, the monitoring scripts are external to the main server - this means you can use Upsilon to execute your monitoring scripts in an extremely robust way. Upsilon has been used to monitor many different things and is totally API compatible with all nagios monitoring scripts.

Extensible: You can add monitoring checks to Upsilon at runtime - without needing to restart the server. The upsilon-node and upsilon-web projects both have their own REST APIs.

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A simple dashboard in upsilon-web A simple dashboard in upsilon-web


Run Upsilon on your computer.



Installation, configuration, etc.


GitHub project

Source code & issue tracker


Mailing Lists

The mailing list is maintains the list and hosts the mailing list archives. Free free to post anything upsilon related.


The channel is #upsilon on If your browser handles IRC links, use; irc://

Ohloh monitors project activity. project_thin_badge.gif
Travis CI builds and tests the project on every commit. upsilon.png

We are also on other websites.