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Nagios Plugin + Phusion Passenger Memory Stats
What is Nagios?
Nagios is software for monitoring servers and systems.
Nagios can check many kinds of system metrics:
- RAM use
- CPU load
- Network connectivity
- Webserver response time
- Database connection count
- etc.
What is a Nagios plugin?
A Nagios plugin is a system monitoring scripts that print out data in a way that Nagios can understand.
We write our own Nagios plugin scripts to monitor aspects of our system such as how many people are signed in, when critical files are modified, and Ruby On Rails errors.
See http://nagiosplug.sourceforge.net/developer-guidelines.html
What is Phusion Passenger?
Phusion Passenger is the software we use to connect our Apache webserver to our Ruby On Rails applications; it is similar to mod_perl.
What is Passenger Memory Stats?
The passenger-memory-stats command prints diagnositic messages about a Phusion Passenger setup.See Phusion Passenger Memory Stats
Use a Nagios plugin to monitor Passenger Memory Stats?
To use Nagios to monitor Passenger Memory Stats, we created Nagios plugin scripts that work much like the parse shell scripts above.
We monitor these sections:
- Apache processes, especially for apache2
- Passenger processes, especially for Rails
- Nginx processes
We monitor these values:
- Total private dirty RSS
- Process count
- VMSize max
- VMSize sum
Download
To download our Nagios plugin scripts for Passenger Memory Stats:
You may need to customize these scripts for your own systems, depending on which version of Phusion Passenger you're using, and how your system runs Apache and Passenger.
If you know GitHub and Git, feel free to fork and clone as you like. If you want to improve these scripts, or add to them, feel free to send us a pull request.