Flask is a web application framework written in Python. Flask is based on the Werkzeug WSGI toolkit and Jinja2 template engine. Both are Pocco projects. This article revolves around how to deploy a flask app on Heroku. To demonstrate this, we are first going to create a sample application for a better understanding of the process.
Prerequisites
- Python
- pip
- Heroku CLI
- Git
Deploying Flask App on Heroku
Let’s create a simple flask application first and then it can be deployed to heroku. Create a folder named “eflask” and open the command line and cd inside the “eflask” directory. Follow the following steps to create the sample application for this tutorial.
STEP 1 : Create a virtual environment with pipenv and install Flask and Gunicorn .
$ pipenv install flask gunicorn
STEP 2 : Create a “Procfile” and write the following code.
$ touch Procfile
STEP 3 : Create “runtime.txt” and write the following code.
$ touch runtime.txt
STEP 4 : Create a folder named “app” and enter the folder.
$ mkdir app $ cd app
STEP 5 : Create a python file, “main.py” and enter the sample code.
touch main.py
Python3
from flask import Flaskapp = Flask(__name__)@app.route("/")def home_view(): return "<h1>Welcome to Geeks for Geeks</h1>" |
STEP 6 :Get back to the previous directory “eflask”.Create a file“wsgi.py” and insert the following code.
$ cd ../ $ touch wsgi.py
Python3
from app.main import appif __name__ == "__main__": app.run() |
STEP 7 : Run the virtual environment.
$ pipenv shell
STEP 8 : Initialize an empty repo, add the files in the repo and commit all the changes.
$ git init $ git add . $ git commit -m "Initial Commit"
STEP 9 : Login to heroku CLI using
heroku login
Now, Create a unique name for your Web app.
$ heroku create eflask-app
STEP 10 : Push your code from local to the heroku remote.
$ git push heroku master
Finally, web app will be deployed on http://eflask-app.herokuapp.com.
