Deploy the Flask app on Heroku

Overview

Here are the steps to deploy the smallest Flask app on Heroku.

Prerequisites

procedure

Create the required resources

Create a directory to put the project files and move to the directory.

$ mkdir flaskonheroku
$ cd flaskonheroku

Create the required files.

$ touch app.py Procfile

Edit app.py as follows.

# -*- coding: utf-8 -*-
from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
    return 'hello, world'

if __name__ == '__main__':
    app.run()

Edit the Procfile as follows.

web: gunicorn app:app --log-file=-

Check if it works in the local environment

$ python app.py
 * Serving Flask app "app" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

Access the address and OK if there is no problem.

Create the files needed for deployment

Create requirements.txt.

$ pip freeze > requirements.txt

Edit requirements.txt as follows.

Click==7.0
Flask==1.1.1
gunicorn==20.0.4
itsdangerous==1.1.0
Jinja2==2.10.3
MarkupSafe==1.1.1
Werkzeug==0.16.0

Preparing the git repository

Initialize as a git repository.

$ git init
$ git add .
$ git commit -m "first commit"

Creating a Heroku app

Log in to Heroku and create an app.

$ heroku login
$ heroku create

Deploy the app to Heroku

A remote repository has been created, so push it.

$ git remote
heroku
$ git push heroku master

Check the app

Open the app and check.

$ heroku open

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