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Heroku

heroku CLI

Commands

# logs
heroku logs --app djb1 --tail

# run
heroku run -a djb1 "python src/manage.py migrate"
heroku run -a djb1 "gunicorn --pythonpath src djpro.wsgi --log-file -"

Configure Project for Heroku

  • Create the following files in the root directory.

    • requirements.txt
    • Procfile
    • runtime.txt

  • Procfile

    release: python src/manage.py migrate
web: gunicorn --pythonpath src core.wsgi --log-file -

Whitenoise Configuration

Reference: https://devcenter.heroku.com/articles/django-assets

Installation

pip install whitenoise

settings.py

from pathlib import Path

BASE_DIR = Path(__file__).resolve(strict=True).parent.parent.parent

MIDDLEWARE = [
    # Part of base
    'django.middleware.security.SecurityMiddleware',

    # From WhiteNoise to serve static files in Heroku from Django
    # Remove this if you are using S3
    'whitenoise.middleware.WhiteNoiseMiddleware',

    # Part of base
    'django.contrib.sessions.middleware.SessionMiddleware',
    '...',
]

# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.1/howto/static-files/

STATIC_ROOT = BASE_DIR / 'staticfiles'
STATIC_URL = '/static/'

# Keep your static files here.
# collectstatic will use this directory to generate static files in STATIC_ROOT.
STATICFILES_DIRS = [BASE_DIR / 'static']

Django won’t automatically create the target directory (STATIC_ROOT) that collectstatic uses, if it isn’t available. You may need to create this directory in your codebase, so it will be available when collectstatic is run. Git does not support empty file directories, so you will have to create a file inside that directory as well.

Allowed Hosts

ALLOWED_HOSTS = ["*"]

Environmental Variables

Production

  • DEV = False
  • SECRET_KEY = YOUR_DJANGO_SECRET_KEY
  • DATABASE_URL = YOUR_DATABASE_URL

DEV = True can be used to run production in debug mode.

Development

  • Configuration not required.
  • By default, DEV = True, DEBUG = True.

DEBUG = False can be used to hide Debug Toolbar.

Deploying in Heroku

  • Run python src/manage.py makemigrations before pushing the repository to git.
  • Create an app in Heroku and attach the git repository with it.
  • Set environment variable DEV = False
  • In the heroku console, run the following commands.
python ./src/manage.py migrate  # Already executed with Profile.
python ./src/manage.py createsuperuser

Connect the Heroku PostgresSQL DB to local pgAdmin

  • Get the DATABASE_URL from Heroku
  • DATABASE_URL = postgres://username:password@host:port/db_name
  • In the pgAdmin, connect ot the PostgreSQL server using the credentials.