[PYTHON] Deploy your Django application on Heroku

Overview

• Premise

• Write the procedure to deploy to Heroku assuming the same structure as Base application.

• [Directory structure](https://suehiro24.esa.io/posts/11#%E3%83%87%E3%82%A3%E3%83%AC%E3%82%AF%E3%83%88 % E3% 83% AA% E6% A7% 8B% E6% 88% 90)

• What you are doing at baseline

• Separation of setting.py by environment

• Development-> root / project-dir / settings / local.py

• Production-> root / project-dir / settings / production.py

• Environment variable management with .env * python-dotenv

• Policy

• Do not install django-toolbelt, install necessary libraries at any time

• Environment

  • Django: 3.0.5
  • Python: 3.8.0

• Package version

Create an app on Heroku

terminal@django application root directory

heroku login

# Create app 
# Memo:Add Remote repository(following)Will also execute
#       git remote add heroku [email protected]:{app-name}.git 
heroku create {app-name}  

Using .env on Heroku

.env

root/.env

SECRET_KEY = ooooooooooooooooooooooooooooooooo
DJANGO_SETTINGS_MODULE = fitmod.settings.local

• At a minimum, prepare the .env file locally

install ”heroku-config”

terminal

# .install plugin for env
heroku plugins:install heroku-config
#Reflected in Heroku environment variables
heroku config:push

Set environment variables in Heroku to specify settings for production

terminal

heroku config:set DJANGO_SETTINGS_MODULE = {app-name}.settings.{settings-file name for product}

Creating the files needed for deployment

Procfile

Install gunicorn

terminal

install gunicorn

Procfile creation

web: python manage.py collectstatic --noinput ; gunicorn note_to_self.wsgi --log-file -

• Execution code when creating dyno
• Collectstatic related error at first deployment
• If you set heroku config: set DISABLE_COLLECTSTATIC = 1, k.

runtime.txt

root/runtime.txt

python-{python version}
# Ex.) python-3.8.0

• Specify the version of python to use

wsgi.py

terminal

pip install dj-static

root/project/wsgi.py

import os

from django.core.wsgi import get_wsgi_application
from dj_static import Cling  #add to
from dotenv import load_dotenv

load_dotenv('.env')
DJANGO_SETTINGS_MODULE = os.getenv("DJANGO_SETTINGS_MODULE")

os.environ.setdefault('DJANGO_SETTINGS_MODULE', DJANGO_SETTINGS_MODULE)
application = Cling(get_wsgi_application())  # Cling()Add

• See) dj-static
• django doesn't originally assume the operation of a static file server for production.
• Therefore, dj-static makes it possible to serve static files even on a production server (WSGI server running with Gunicorn).

Settings when using PostgreSQL

install

#DB for Heroku PostgreSQL-Installation of the library that handles URLs.
python -m pip install dj_database_url psycopg2

# PostgrSQL Add-on installation
heroku addons:create heroku-postgresql:hobby-dev

usage

settings/production.py

#
import dj_database_url

# Setting PostgreSQL To Heroku 
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'fitmod',
        'USER': 'name',
        'PASSWORD': '',
        'HOST': 'localhost',
        'PORT': '',
    }
}
#Bottom
db_from_env = dj_database_url.config(conn_max_age=500)
DATABASES['default'].update(db_from_env)

requirements.txt

terminal

pip freeze > requirements.txt

Deployment and Django settings

tarminal

# Deploy
git push heroku master

migrate, createsuperuser

terminal

heroku run python manage.py migrate
heroku run python manage.py createsuperuser

requirements.txt

asgiref==3.2.7
dj-database-url==0.5.0
dj-static==0.0.6
Django==3.0.5
gunicorn==20.0.4
psycopg2==2.8.5
python-dotenv==0.13.0
pytz==2020.1
sqlparse==0.3.1
static3==0.7.0