[PYTHON] Memo of deploying Django × Postgresql on Docker to Heroku

Introduction

The Django app created in tutorials such as Django Girls has been converted to Docker. And I want to deploy the app to Heroku. The tutorial also describes how to deploy Heroku, so basically you can deploy by referring to it. If you don't understand it, you may want to try building, developing, and deploying the environment locally once or twice.

Premise

Created an app to be deployed on heroku

procedure

1. Add the required packages to heroku to the list of Python libraries, edit and save

requirements.txt

Django==2.2.16
psycopg2

#Below this is the newly added library
dj-database-url
gunicorn
whitenoise==3.0.0

2. Create a Procfile in the root directory, edit and save

Procfile

web:gunicorn management interface name.wsgi --log-file -

3. To let Heroku know which version of Python you want to use.

runtime.txt

python-3.6.4

4. Create a development environment file, edit and save it This time it is postgresql even in the development environment, so the DATABASE field copies the database settings of its own settings.py. Below is a sample.

Management interface/local_settings.py

import os
BASE_DIR = os.path.dirname(os.path.dirname(__file__))

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'postgres',
        'USER': 'postgres',
        'PASSWORD': 'postgres',
        'HOST': 'db',
        'PORT': 5432,
    }
}

DEBUG = True

5. Edit the configuration file for production environment This also sets the database settings for each person

Management interface/settings.py

import dj_database_url

...

DEBUG = False

ALLOWED_HOSTS = ['127.0.0.1', '.herokuapp.com']

...

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'postgres',
        'USER': 'postgres',
        'PASSWORD': 'postgres',
        'HOST': 'db',
        'PORT': '5432',
    }
}

...

db_from_env = dj_database_url.config(conn_max_age=500)
DATABASES['default'].update(db_from_env)

6. Edit wsgi.py

Management interface/wsgi.py

...
# Heroku
from whitenoise.django import DjangoWhiteNoise
application = DjangoWhiteNoise(application)

7. Deploy to heroku Deploying to heroku can be broadly divided into pushing directly from the command line or auto-deploying Github code, either way to upload the code to heroku.

8. Set up a production (heroku) database Run the migration on heroku's server and create an admin user This can also be operated from the command line and heroku site

9. Successful deployment Check if you can deploy properly from the URL

References

https://tutorial-extensions.djangogirls.org/ja/heroku/ https://devcenter.heroku.com/articles/getting-started-with-python