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Essential Django Deployment Tips: achieving Reproducibility and Best Practices

This guide offers comprehensive tips and best practices for deploying Django applications efficiently and reliably. You will learn to make your application run seamlessly with one click wherever needed while maintaining consistency across all environments. Essential topics include creating reproducible infrastructure, dependency management, configuration, system security, and performance optimization. Discover how to automate deployment steps, manage backups, and implement load balancing strategies to enhance your Django application's reliability and performance.

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Essential Django Deployment Tips: achieving Reproducibility and Best Practices

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  1. Django Deployment Tips, Tricks and Best Practices Erik LaBianca, WiserTogether, Inc.

  2. You mission, should you choose to accept it: • Make your application run with 1 click, everywhere it counts, every time. • Make your application run exactly the same way, everywhere it counts, every time. • Prove that the above are true. Reproducibility

  3. Reproducible Infrastructure • Reproducible Systems • Reproducible [Django] Applications • Dependencies • Configuration • Data • Deployment Steps to Reproducibility

  4. Systems: Virtual or Physical • Power Management • Console • Backup / Restore • Network Layer • Load Balancing • Security • Performance Infrastructure

  5. A Stable Foundation • Stable Operating System • Reproducible Installation • Kickstart Install • Base Image • Configuration Management • Puppet, Chef • Packaging Systems

  6. What Python? • Database? • Backup / Restore • Failover • Performance • Caching? • HTTP • Objects • Queuing? • SSL? Application Environment

  7. It’s just code, right? • Probably Not Application

  8. lib/pypi-cache: Django-1.4.3.tar.gz requirements.txt: Django==1.4.3 Type this: pip install --no-index --find-links file://$(PWD)/lib/pypi-cache -r requirements.txt • Just use pip! • Not so fast. • Lots of external dependencies • Eliminate them with a local cache • Don’t’ forget virtualenv! Dependencies

  9. settings.py: from urlparse import urljoin from os import environ import dj_database_url #courtesy of Heroku DATABASES = dj_database.config(default=“xxx”) BASE_URL = environ[‘DJANGO_BASE_URL’] STATIC_URL = urljoin(BASE_URL, ‘static’) MEDIA_URL = urljoin(BASE_URL, ‘media’) Run this: DJANGO_BASE_URL=http://cdn.com/base/django-admin.pyrunserver • settings.py • No logic allowed! • “unknown” import times • Critical • Local_settings.py • More of the same • Consider pushing configuration in externally via environ, configparser, etc Configuration

  10. fixtures/polls.py: from ..models import Poll, Choice def apply(): p = Poll.objects.get_or_create(q=‘test q’, defaults=dict(pub_date=‘1980-01-01)) c1 = Choices.objects.get_or_create(poll=p, choice_text=‘option 1’) fixtures/tests/test_poll.py: Class PollFixtureTestCase(TestCase): deftest_fixture_applied(): self.assertEquals(Poll.objects.get(q=‘test q’) • Fixtures. Consider writing them in Python! • Testable • More resilient to change • Less pkpain • Migrations! • Test them Database

  11. management/__init__.py: from django.db.models.signals import post_syncdb from south.signals import post_migrate from .. import models, fixtures defupdate_poll_fixtures(verbose=True): fixtures.poll.apply() if verbose: print "Updating dynamic fixtures for profile” defupdate_fixtures_post_syncdb(sender, **kwargs): update_poll_fixtures() defupdate_fixtures_post_migrate(app, **kwargs): if app == ’polls': update_poll_fixtures() post_syncdb.connect(fixtures_post_syncdb, sender=models) post_migrate.connect(fixtures_post_migrate)

  12. Interwebs • Back Up Everything! • Move files to Green • Fabric? • RPM? • Tar? • Git? • Rsync? • Update Stuff • syncdb • apply fixtures • Test Green! • Flip/Flop Blue/Green • (Roll back to Blue) App App Deploy / Test Data Deployment: Blue/Green

  13. Erik LaBianca, WiserTogether, Inc. erik.labianca@gmail.com @easel https://linkedin.com/in/eriklabianca/ https://slideshare.net/easel1/ https://github.com/easel/ https://github.com/WiserTogether/ Questions?

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