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92 lines
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92 lines
3.5 KiB
Plaintext
=======================
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How to deploy with WSGI
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=======================
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Django's primary deployment platform is WSGI_, the Python standard for web
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servers and applications.
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.. _WSGI: http://www.wsgi.org
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Django's :djadmin:`startproject` management command sets up a simple default
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WSGI configuration for you, which you can tweak as needed for your project,
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and direct any WSGI-compliant application server to use.
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Django includes getting-started documentation for the following WSGI servers:
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.. toctree::
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:maxdepth: 1
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modwsgi
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apache-auth
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gunicorn
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uwsgi
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The ``application`` object
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--------------------------
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The key concept of deploying with WSGI is the ``application`` callable which
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the application server uses to communicate with your code. It's commonly
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provided as an object named ``application`` in a Python module accessible to
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the server.
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The :djadmin:`startproject` command creates a file
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:file:`<project_name>/wsgi.py` that contains such an ``application`` callable.
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It's used both by Django's development server and in production WSGI
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deployments.
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WSGI servers obtain the path to the ``application`` callable from their
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configuration. Django's built-in server, namely the :djadmin:`runserver`
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command, read it from the :setting:`WSGI_APPLICATION` setting. By default, it's
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set to ``<project_name>.wsgi.application``, which points to the ``application``
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callable in :file:`<project_name>/wsgi.py`.
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Configuring the settings module
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-------------------------------
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When the WSGI server loads your application, Django needs to import the
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settings module — that's where your entire application is defined.
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Django uses the :envvar:`DJANGO_SETTINGS_MODULE` environment variable to
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locate the appropriate settings module. It must contain the dotted path to the
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settings module. You can use a different value for development and production;
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it all depends on how you organize your settings.
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If this variable isn't set, the default :file:`wsgi.py` sets it to
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``mysite.settings``, where ``mysite`` is the name of your project. That's how
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:djadmin:`runserver` discovers the default settings file by default.
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.. note::
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Since environment variables are process-wide, this doesn't work when you
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run multiple Django sites in the same process. This happens with mod_wsgi.
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To avoid this problem, use mod_wsgi's daemon mode with each site in its
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own daemon process, or override the value from the environment by
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enforcing ``os.environ["DJANGO_SETTINGS_MODULE"] = "mysite.settings"`` in
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your :file:`wsgi.py`.
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Applying WSGI middleware
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------------------------
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To apply `WSGI middleware`_ you can simply wrap the application object. For
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instance you could add these lines at the bottom of :file:`wsgi.py`::
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from helloworld.wsgi import HelloWorldApplication
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application = HelloWorldApplication(application)
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You could also replace the Django WSGI application with a custom WSGI
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application that later delegates to the Django WSGI application, if you want
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to combine a Django application with a WSGI application of another framework.
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.. _`WSGI middleware`: https://www.python.org/dev/peps/pep-3333/#middleware-components-that-play-both-sides
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.. note::
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Some third-party WSGI middleware do not call ``close`` on the response
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object after handling a request — most notably Sentry's error reporting
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middleware up to version 2.0.7. In those cases the
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:data:`~django.core.signals.request_finished` signal isn't sent. This can
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result in idle connections to database and memcache servers.
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