Create & Dockerize a Flask app with Redis

For this project we would create everything from scratch.

Section 1 : We would create the Flask app

Section 2 : We would deploy the app as service, along with redis using docker and docker-compose.

Section 1

Creating a flask app that returns the count number of times the page was visited.

Create a requirements.txt file, and paste the following dependency name

Flask

redis

Import dependencies using

pip install --no-cache-dir -r requirements.txt

Create a app.py file 

from flask import Flask

from redis import Redis

app = Flask(__name__)

redis = Redis(host='db_service', port=6379)

@app.route('/')

def hello():

    visit_count = redis.incr('visit_count')

    return f"Hello, this page has been visited {visit_count} times."

if __name__ == '__main__':

    app.run(host='0.0.0.0')

We can test the app locally for this we need to:

Install virtualenv if it's not already installed:

sudo apt-get update

sudo apt-get install python3-venv

Create a new virtual environment:

python3 -m venv myenv

Activate the virtual environment:

source myenv/bin/activate

Install Flask and Redis within the virtual environment:

pip install Flask redis

Run the Flask application within the virtual environment:

python3 app.py

Section 2

For Section 2, Let's visit one previous project Build Flask Image using docker & docker-compose

You can also follow the github project DockerizeFlaskVisitCounter

---THANK YOU---