This is the Part 2 of the post Deploying a django app. For Part 1 go here. This part will cover steps required to host your django project on Heroku.

Deploy django part 2

All the files that are created and the shell commands given below should be executed within the root of the project directory i.e. the directory containing the file manage.py

Create a Heroku Account here.
Download Heroku cli from here.

Setup git

 $ git init
 $ git status
 <your-project>/
 manage.py
 ...

Install requirements

 $ pip install psycopg2 dj-database-url gunicorn

Create runtime.txt and write into it the python version of the project (let the version be Python 3.6.4)
```
 $ echo "python-3.6.4" > runtime.txt
```
Create .gitignore and Procfile
```
 $ echo ".py[cod]" > .gitignore
 $ echo "web: gunicorn <your_project>.wsgi" > Procfile
```
Replace <your_project> with your project name or where the .wsgi file exists.
Login to heroku
```
 $ heroku login
```
Then enter the credentials.
Create Heroku Project:
```
 $ heroku create <project_name>
```

Provision Database Add-on:

 $ heroku addons:create heroku-postgresql:hobby-dev

Update settings.py to include:

DEBUG = False
ALLOWED_HOSTS =  ['project-name.herokuapp.com', '.yourdomain.com']
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}

# add this
import dj_database_url
db_from_env = dj_database_url.config()
DATABASES['default'].update(db_from_env)
DATABASES['default']['CONN_MAX_AGE'] = 500

Setup Environment Variables
- Go to your app’s Heroku dashboard and navigate to Settings.
- Click on Reveal Config Vars
- Add all the security keys of your project into it. (For example the SECRET_KEY, EMAIL_HOST_PASSWORD etc.)
- Add the key values without any quotes.

Update requirements.txt

$ pip freeze > requirements.txt
$ git add requirements.txt
$ git commit -m "Updated requirements.txt"

Commit & Push

$ git add .
$ git commit -m "Initial Heroku commit"
$ git push heroku master

Disable Collectstatic in order to use S3 for static files
```
$ heroku config:set DISABLE_COLLECTSTATIC=1
```
Run migrations
```
$ heroku run python manage.py migrate
```
Other common commands:
- Create superuser: heroku run python manage.py createsuperuser
- Enter Heroku’s bash: heroku run bash for shell access
- Live Python-Django shell: heroku run python manage.py shell

Custom Domains & SSL on Heroku

Add a Custom Domain

 $ heroku domains:add <your-custom-domain.com>
 $ heroku domains:add www.<your-custom-domain.com>

Update your DNS to what heroku says above
Enable Heroku to Handle Let’s Encrypt Certificate
```
 $ heroku certs:auto:enable
```

Note

When changes are made to the models, run makemigrations locally first, then push the changes to heroku and then run migrate on the production server. (This is because, if any error occurs in models, then we can fix it locally first.)
Whenever some changes are made to the environment variables in herkou, restart the server from More --> Restart all dynos

Deploying a django app - Part 2

Going live with Heroku

Custom Domains & SSL on Heroku

Note