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Puppet Webapp Module tying together Nginx, Gunicorn, and Monit

Helper module for easy configuration of Python WSGI applications with Virtualenv, Gunicorn, Monit, and Nginx.

Tested on Debian GNU/Linux 6.0 Squeeze and Ubuntu 10.4 LTS with Puppet 2.6. Patches for other operating systems welcome.

Installation

Clone this repo and all its dependencies to respective directories under your Puppet modules directory:

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

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_webapp.pp

Usage

To install Python with development dependencies, Virtualenv, Gunicorn support directories, Monit, and Nginx simply include the module:

include webapp::python

You should provide an unprivileged user which will own the Virtualenv files and Gunicorn processes by including the module with this special syntax:

class { "webapp::python": owner => "www-mgr", group => "www-mgr" }

By default this module will look for source code under /usr/local/src/$name and create virtualenvs under /usr/local/venv. To override this, provide the following arguments on class instantiation:

class { "webapp::python": owner => "www-mgr",
                          group => "www-mgr",
                          src_root => "/home/www-mgr/src",
                          venv_root => "/home/www-mgr/venv",
}

You can also provide Nginx and Monit specific settings:

class { "webapp::python": owner => "www-mgr",
                          group => "www-mgr",
                          src_root => "/home/www-mgr/src",
                          venv_root => "/home/www-mgr/venv",
                          nginx_workers => 2,
                          monit_admin => "[email protected]",
                          monit_interval => 30,
}

Note that you'll need to define a global search path for the exec resource to make the webapp::python::instance resource function properly. This should ideally be placed in manifests/site.pp:

Exec {
  path => "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
}

The most basic setup of a Nginx virtualhost, virtualenv, Gunicorn installation inside the virtualenv, and Monit watching the Gunicorn processes:

webapp::python::instance { "blog":
  domain => "blog.uggedal.com",
  wsgi_module => "blog:app",
}

You should tweak how Monit is watching your Gunicorn process according to your application:

webapp::python::instance { "blog":
  domain => "blog.uggedal.com",
  wsgi_module => "blog:app",
  monit_memory_limit => 300, # In MB
  monit_cpu_limit => 50, # In %
}

You can provide domain aliases which Nginx redirects to your main domain:

webapp::python::instance { "blog":
  domain => "blog.uggedal.com",
  aliases => ["journal.uggedal.com"],
  wsgi_module => "blog:app",
}

If your application is busy you can increase the amount of Gunicorn workers:

webapp::python::instance { "blog":
  domain => "blog.uggedal.com",
  wsgi_module => "blog:app",
  workers => 4,
}

Django applications does not use the wsgi_module, but are enabled by using the django flag:

webapp::python::instance { "cms":
  domain => "cms.uggedal.com",
  django => true,
}

You can optionally provide a specific settings file to use with Django:

webapp::python::instance { "cms":
  domain => "cms.uggedal.com",
  django => true,
  django_settings => "settings_production.py",
}

Puppet can manage installation of requirements from a requirements.txt inside your source directory:

webapp::python::instance { "cms":
  domain => "cms.uggedal.com",
  django => true,
  requirements => true,
}

If your requirements file isn't named requirements.txt you can provide a name as well:

webapp::python::instance { "cms":
  domain => "cms.uggedal.com",
  django => true,
  requirements => "requirements_production.txt",
}

Provide a URL media prefix and media root directory if you have a media directory of static files which should be served directly by Nginx and not by your application servers. These files will be cached indefinitely:

webapp::python::instance { "cms":
  domain => "cms.uggedal.com",
  django => true,
  mediaprefix => "/media",
  mediaroot => "/usr/local/src/cms/media",
}

If you provide a relative mediaroot it will be relative to the /var/www/$name directory:

webapp::python::instance { "blog":
  domain => "blog.uggedal.com",
  wsgi_module => "blog:app",
  mediaprefix => "/static",
  mediaroot => "files/static",
}