Lab 6 - Heroku


Deploy the Django application created in Lab 4 to Heroku. Understand the reasoning behind Platform as a Service (PaaS) businesses like Heroku. You may follow the official documentation.

Setting up the Heroku CLI

Sign up for a free Heroku account at https://signup.heroku.com/.

Download and install the Heroku CLI tools.

wget https://cli-assets.heroku.com/heroku-linux-x64.tar.gz
tar -xvf heroku-linux-x64.tar.gz
export PATH="$PATH:$HOME/heroku/bin"

Ensure the heroku tool works, login to your account.

heroku --version
# heroku/7.19.4 linux-x64 node-v11.3.0
heroku login

Deploying our Django Application

Ensure the Django application created in Lab 4 is working locally.

Activate the virtualenv for the Django application.

Ensure that the current working directory is similar to the following.

$ tree 
.
├── db.sqlite3
├── manage.py
├── mysite
│   ├── __init__.py
│   ├── settings.py
│   ├── urls.py
│   └── wsgi.py
└── polls
    ├── admin.py
    ├── apps.py
    ├── __init__.py
    ├── migrations
    │   ├── 0001_initial.py
    │   ├── __init__.py
    │   └── __pycache__
    │       ├── 0001_initial.cpython-37.pyc
    │       └── __init__.cpython-37.pyc
    ├── models.py
    ├── tests.py
    ├── urls.py
    └── views.py

Pip install gunicorn and django-heroku.

pip install gunicorn django-heroku

Save the new python requirements into the requirements.txt file.

pip freeze > requirements.txt

Create a new file named Procfile for Heroku applications.

web: gunicorn mysite.wsgi

Within mysite/settings.py, add the following statements:

import django_heroku # top of the file

# ...

django_heroku.settings(locals()) # bottom of the file

Commit your files and deploy the application using a git integration.

What happens when you go to /polls on your Heroku deployed site?

Run your migrations, create a Superuser, and ensure your application functionality works.

$ heroku run --app APPNAME python manage.py migrate
$ heroku run --app APPNAME python manage.py createsuperuser

Question 1: What are some ways you can deploy your code to Heroku?

Question 2: What is a Procfile used for?

Question 3: What is the link to your deployed application (on herokuapps)?

Optional: Configure TravisCI or CircleCI for a deployment pipeline that utilizes tests.