Puppet Monit Module

Module for configuring Monit and and setting up monitoring of running processes.

Tested on Debian GNU/Linux 6.0 Squeeze. Patches for other operating systems welcome.

Installation

Clone this repo to a monit directory under your Puppet modules directory:

git clone git://github.com/uggedal/puppet-module-monit.git monit

If you don't have a Puppet Master you can create a manifest file based on the notes below and run Puppet in stand-alone mode providing the module directory you cloned this repo to:

puppet apply --modulepath=modules test_monit.pp

Usage

To install and configure Monit, include the module:

include monit

You can override defaults in the Monit config by including the module with this special syntax:

class { monit: admin => "eivind@uggedal.com but not on { instance pid ppid }", interval => 30, delay => 240 }

Setting up monitoring of processes is done with the monit::site resource. Note that the name needs to be the same as an init script in /etc/init.d:

monit::monitor { "ssh":
  pidfile => "/var/run/sshd.pid",
}

You can specify a IP port to check if you're running a network process:

monit::monitor { "nginx":
  pidfile => "/var/run/nginx.pid",
  ip_port => 22,
}

Alternatively you can specify a Unix socket to check:

monit::monitor { "gunicorn-blog":
  pidfile => "/var/run/gunicorn/blog.pid",
  socket => "/var/run/gunicorn/blog.sock",
}

You can also provide additional checks:

$reload_blog = "/etc/init.d/gunicorn-blog reload"

monit::monitor { "gunicorn-blog":
  pidfile => "/var/run/gunicorn/blog.pid",
  socket => "/var/run/gunicorn/blog.sock",
  checks => ["if totalmem > 300 MB for 2 cycles then exec \"$reload_blog\"",
             "if totalmem > 300 MB for 3 cycles then restart",
             "if cpu > 50% for 2 cycles then alert"],
}