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249 lines
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249 lines
8.5 KiB
Plaintext
====================
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Deployment checklist
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====================
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The Internet is a hostile environment. Before deploying your Django project,
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you should take some time to review your settings, with security, performance,
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and operations in mind.
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Django includes many :doc:`security features </topics/security>`. Some are
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built-in and always enabled. Others are optional because they aren't always
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appropriate, or because they're inconvenient for development. For example,
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forcing HTTPS may not be suitable for all websites, and it's impractical for
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local development.
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Performance optimizations are another category of trade-offs with convenience.
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For instance, caching is useful in production, less so for local development.
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Error reporting needs are also widely different.
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The following checklist includes settings that:
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- must be set properly for Django to provide the expected level of security;
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- are expected to be different in each environment;
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- enable optional security features;
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- enable performance optimizations;
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- provide error reporting.
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Many of these settings are sensitive and should be treated as confidential. If
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you're releasing the source code for your project, a common practice is to
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publish suitable settings for development, and to use a private settings
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module for production.
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Critical settings
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=================
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:setting:`SECRET_KEY`
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---------------------
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**The secret key must be a large random value and it must be kept secret.**
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Make sure that the key used in production isn't used anywhere else and avoid
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committing it to source control. This reduces the number of vectors from which
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an attacker may acquire the key.
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Instead of hardcoding the secret key in your settings module, consider loading
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it from an environment variable::
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import os
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SECRET_KEY = os.environ['SECRET_KEY']
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or from a file::
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with open('/etc/secret_key.txt') as f:
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SECRET_KEY = f.read().strip()
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:setting:`DEBUG`
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----------------
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**You must never enable debug in production.**
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You're certainly developing your project with :setting:`DEBUG = True <DEBUG>`,
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since this enables handy features like full tracebacks in your browser.
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For a production environment, though, this is a really bad idea, because it
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leaks lots of information about your project: excerpts of your source code,
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local variables, settings, libraries used, etc.
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Environment-specific settings
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=============================
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:setting:`ALLOWED_HOSTS`
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------------------------
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When :setting:`DEBUG = False <DEBUG>`, Django doesn't work at all without a
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suitable value for :setting:`ALLOWED_HOSTS`.
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This setting is required to protect your site against some CSRF attacks. If
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you use a wildcard, you must perform your own validation of the ``Host`` HTTP
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header, or otherwise ensure that you aren't vulnerable to this category of
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attacks.
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:setting:`CACHES`
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-----------------
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If you're using a cache, connection parameters may be different in development
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and in production.
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Cache servers often have weak authentication. Make sure they only accept
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connections from your application servers.
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If you're using Memcached, consider using :ref:`cached sessions
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<cached-sessions-backend>` to improve performance.
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:setting:`DATABASES`
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--------------------
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Database connection parameters are probably different in development and in
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production.
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Database passwords are very sensitive. You should protect them exactly like
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:setting:`SECRET_KEY`.
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For maximum security, make sure database servers only accept connections from
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your application servers.
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If you haven't set up backups for your database, do it right now!
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:setting:`EMAIL_BACKEND` and related settings
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---------------------------------------------
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If your site sends emails, these values need to be set correctly.
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:setting:`STATIC_ROOT` and :setting:`STATIC_URL`
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------------------------------------------------
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Static files are automatically served by the development server. In
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production, you must define a :setting:`STATIC_ROOT` directory where
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:djadmin:`collectstatic` will copy them.
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See :doc:`/howto/static-files/index` for more information.
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:setting:`MEDIA_ROOT` and :setting:`MEDIA_URL`
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----------------------------------------------
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Media files are uploaded by your users. They're untrusted! Make sure your web
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server never attempt to interpret them. For instance, if a user uploads a
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``.php`` file , the web server shouldn't execute it.
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Now is a good time to check your backup strategy for these files.
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HTTPS
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=====
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Any website which allows users to log in should enforce site-wide HTTPS to
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avoid transmitting access tokens in clear. In Django, access tokens include
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the login/password, the session cookie, and password reset tokens. (You can't
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do much to protect password reset tokens if you're sending them by email.)
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Protecting sensitive areas such as the user account or the admin isn't
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sufficient, because the same session cookie is used for HTTP and HTTPS. Your
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web server must redirect all HTTP traffic to HTTPS, and only transmit HTTPS
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requests to Django.
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Once you've set up HTTPS, enable the following settings.
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:setting:`CSRF_COOKIE_SECURE`
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-----------------------------
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Set this to ``True`` to avoid transmitting the CSRF cookie over HTTP
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accidentally.
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:setting:`SESSION_COOKIE_SECURE`
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--------------------------------
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Set this to ``True`` to avoid transmitting the session cookie over HTTP
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accidentally.
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Performance optimizations
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=========================
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Setting :setting:`DEBUG = False <DEBUG>` disables several features that are
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only useful in development. In addition, you can tune the following settings.
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:setting:`CONN_MAX_AGE`
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-----------------------
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Enabling :ref:`persistent database connections
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<persistent-database-connections>` can result in a nice speed-up when
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connecting to the database accounts for a significant part of the request
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processing time.
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This helps a lot on virtualized hosts with limited network performance.
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:setting:`TEMPLATE_LOADERS`
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---------------------------
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Enabling the cached template loader often improves performance drastically, as
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it avoids compiling each template every time it needs to be rendered. See the
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:ref:`template loaders docs <template-loaders>` for more information.
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Error reporting
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===============
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By the time you push your code to production, it's hopefully robust, but you
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can't rule out unexpected errors. Thankfully, Django can capture errors and
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notify you accordingly.
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:setting:`LOGGING`
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------------------
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Review your logging configuration before putting your website in production,
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and check that it works as expected as soon as you have received some traffic.
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See :doc:`/topics/logging` for details on logging.
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:setting:`ADMINS` and :setting:`MANAGERS`
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-----------------------------------------
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:setting:`ADMINS` will be notified of 500 errors by email.
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:setting:`MANAGERS` will be notified of 404 errors.
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:setting:`IGNORABLE_404_URLS` can help filter out spurious reports.
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See :doc:`/howto/error-reporting` for details on error reporting by email.
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.. admonition: Error reporting by email doesn't scale very well
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Consider using an error monitoring system such as Sentry_ before your
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inbox is flooded by reports. Sentry can also aggregate logs.
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.. _Sentry: http://sentry.readthedocs.org/en/latest/
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Customize the default error views
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---------------------------------
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Django includes default views and templates for several HTTP error codes. You
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may want to override the default templates by creating the following templates
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in your root template directory: ``404.html``, ``500.html``, ``403.html``, and
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``400.html``. The default views should suffice for 99% of Web applications, but
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if you desire to customize them, see these instructions which also contain
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details about the default templates:
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* :ref:`http_not_found_view`
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* :ref:`http_internal_server_error_view`
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* :ref:`http_forbidden_view`
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* :ref:`http_bad_request_view`
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Miscellaneous
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=============
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:setting:`ALLOWED_INCLUDE_ROOTS`
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--------------------------------
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This setting is required if you're using the :ttag:`ssi` template tag.
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Python Options
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==============
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If you're using Python 2.6.8+, it's strongly recommended that you invoke the
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Python process running your Django application using the `-R`_ option or with
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the :envvar:`PYTHONHASHSEED` environment variable set to ``random``.
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These options help protect your site from denial-of-service (DoS)
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attacks triggered by carefully crafted inputs. Such an attack can
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drastically increase CPU usage by causing worst-case performance when
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creating ``dict`` instances. See `oCERT advisory #2011-003
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<http://www.ocert.org/advisories/ocert-2011-003.html>`_ for more information.
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.. _-r: http://docs.python.org/2.7/using/cmdline.html#cmdoption-R
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