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Pimon is a simple server monitor designed for the Raspberry Pi.

What do I need to get it to work?

  1. Clone this repo: git clone git://github.com/pedrocarrico/pimon.git
  2. bundle
  3. bin/pimon start # run the sinatra app
  4. go to http://localhost:3000 and PROFIT! Optionally you may install it as a gem and run it, please check "Installing as a gem" further down.


Configuration is done through a YAML file, you may check some examples on the config directory.

  1. chart - colors for each chart
  2. hostname - optional hostname to show on the chart subtitle, defaults to hostname if not set
  3. stats_collector - configure number of stats and time period between them

Installing as a gem

gem install pimon

After installation just do pimon start and go to http://localhost:3000 and check your stats. If you want you may run Pimon with other options:

Usage: pimon start|stop [options]
    -c, --config CONFIG              YAML configuration file for pimon
    -d, --daemonize                  Run Pimon daemonized in the background
    -e, --environment ENVIRONMENT    Application environment (default: "development", options: "development", "production")
    -i, --interface INTERFACE        Hostname or IP address of the interface to listen on (default: "localhost")
    -p, --port PORT                  Port to use (default: 3000)
    -P, --pid PIDFILE                File to store PID (default: /tmp/pimon.pid)

(This will only work on your Raspberry Pi and perhaps some other linux distros, check the quirks section for more info).

Running tests

To run the coverage suite:

rake coverage:spec

Results will be in coverage/index.html directory.


Pimon uses vmstat and free to collect it's stats from the operating system and these are only available on operating systems that have the /proc filesystem.
So if you want to develop on a Mac you may use the mock implementations that are in the bin directory.
The mock implementations are programmed in C and mimic the output of vmstat and free.
They just change and generate some random values on the observed stats using /dev/urandom.
To use them you must first compile them using make and then include the bin directory of this project in your $PATH to have them available when you run the sinatra application. The temperature stat is only available with the latest Raspbian distro (2012-09-18) on your Raspberry Pi and will (may) not work if you're developing on other systems.
Pimon only works with Ruby 1.9+, please refer to my blog for a way to install Ruby 1.9.3 on your Raspberry Pi.


  1. Improve disk stats, have a way of having custom mount points
  2. Change configuration in realtime
  3. Cpu frequency probe
  4. Persist stats


Licensed under the WTFPL license.