Deploy Flask app on Heroku with example guide

Deploying a python flask app has many ways to do, and there is a lot of platforms available
Here I am going to show how to deploy a python flask application on Heroku in a free plan

Let's Get started

I assume You already developed your flask application in your local environment, have a Heroku account, and have some basic knowledge of working with git and Command-line Interface.

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why Heroku?

Heroku Free account provides 550 free dyno hours and free domain

Example: https://app_name.herokuapp.com.

 Learn more at Heroku Free Dyno Hours

Heroku Provide some option to Deploy App: 

First one is deployed your app by linking your GitHub repository with your Heroku Account

Another one is using the Heroku Command-line Interface (Heroku CLI) by pushing the application on Heroku git servers

Here in this post, I will demonstrate how to deploy the flask app by linking your GitHub repository with Heroku

1: Deploy your app on GitHub:

Develop your application and initialize and commit your changes with git on your local work base 

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Here in the example, I am making local repository contain one simple flask app called app.py

2: Install a web server called Gunicorn

In order to host application Heroku, we need to install a webserver called Gunicorn.

Run the following command in your command line to install gunicorn   

                                           pip install gunicorn

3: Create a requirements.txt file

Now you want to output all your dependent packages for that application needs in a file called requirements.txt

run the following command in your command line

                                        pip freeze > requirements.txt

check the requirements.txt contains all your required packages to run the application

                                         cat requirements.txt

4: Create a Procfile:

Procfile is a mechanism for declaring what commands are run by your application’s dynos on the Heroku platform.

Create the file in name of Procfile    there is no Extension  and their P is Upper case

paste that following lines on Procfile

                                                         web gunicorn app:app

Here web is used by Heroku to start a web server for the application

app:app denotes that module and application name in our case both are called app if it differs on your application change that accordingly

5: Push that repository on Github:

Create a repository on GitHub

add and commit your files in the local repository 

And push that on the GitHub  master branch

Example Screenshots:

6: Create an App on Heroku:

Before creating an app make sure your GitHub account is connected with Heroku Account 

then create an app on Heroku here is the example 

Open your Heroku app go to deploy option 

select the Deployment method as  Github, 

Search your repository with a name and click connect 

Deploy:

On the below, you can see the manual deploy option 

select your branch name in the case it is a master branch

Click the deploy branch option 

Now your app started to deploy on Heroku wait for some time 

after the successful message popup view your app by that URL 

https://yourapplicationname.herokuapp.com

in the case, https://deploy-flask-app.herokuapp.com/ is my URL 

Finish Now you have successfully deployed your application on Heroku 

If you see "Application Error"?

If you see the Any application error once again check your Procfile and make sure your python run time is supported by Heroku >  Heroku Python Support

Thank you for reading...

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