Django Heroku: complete deployment guide �

This complete guide explains step by step how to deploy a Django application on Heroku and configure a postgreSql database.

Prerequisites:

Before you start, check that you have:

• Python 3.x
• git
• A heroku account
• a local functional django application
• The HEROKU command line interface (Heroku CLI)

Project preparation:

1. Project structure: Your project must look like this:

<code>my_project/
├── manage.py
├── my_project/
│   ├── __init__.py
│   ├── settings.py
│   ├── urls.py
│   └── wsgi.py
├── requirements.txt
└── Procfile</code>

2. Configuration of dependencies:

Create the requirements.txt:

file

<code class="language-bash">pip freeze > requirements.txt</code>

Add the following outbuildings:

<code>django
gunicorn
psycopg2-binary
django-environ
whitenoise
dj-database-url</code>

3. Django configuration for Heroku:

Modify the settings.py:

file

<code class="language-python">import os
import dj_database_url
from pathlib import Path

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

SECRET_KEY = os.environ.get('SECRET_KEY', 'votre-clé-secrète-par-défaut')

DEBUG = os.environ.get('DEBUG', 'True') == 'True'

ALLOWED_HOSTS = os.environ.get('ALLOWED_HOSTS', '').split(',')

DATABASES = {
    'default': dj_database_url.config(
        default=os.environ.get('DATABASE_URL', 'sqlite:///db.sqlite3'),
        conn_max_age=600
    )
}

STATIC_URL = '/static/'
STATIC_ROOT = BASE_DIR / 'staticfiles'
STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'

MIDDLEWARE = [
    # ...
    'whitenoise.middleware.WhiteNoiseMiddleware',
]</code>

4. Creation of the procile:

Create a Procfile file to the project root with the following content:

<code>web: gunicorn my_project.wsgi</code>

Deployment on Heroku:

1. Creation of the Heroku application:

<code class="language-bash">heroku create mon-app-django</code>

2. Configuration of environment variables:

<code class="language-bash">heroku config:set SECRET_KEY='votre-clé-secrète'
heroku config:set DEBUG='False'
heroku config:set ALLOWED_HOSTS='.herokuapp.com'</code>

3. Postgresql database: (continued in the next section)

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