Covering from days 44-46 and implementing in this project

Introduction

In this project, we'll explore the process of Dockerizing a Python Flask Redis app using Docker-Compose. We started by setting up Folder and files by cloning our newly created GitHub repository onto it. After installing Docker and Docker-compose, then we proceeded to containerize the application using a Dockerfile.

"We will be using VSCode to write codes"

Setting up the environment

• Open your Ubuntu on your VM

• After logging into your account, create a Folder named Docker-project

• cd into Docker-project and clone the newly create repo from your GitHub repository using git clone

    git clone https://github.com/yourusername/Python-docker-project
  

• Now open this folder in vscode application

• Let's create some files first app.py

    from flask import Flask
    from redis import Redis
  
    app = Flask(__name__)
    redis = Redis(host='redis', port=6379)
  
    @app.route("/")
    def index():
        redis.incr('hits')
        counter = str(redis.get('hits'),'utf-8')
        return "Welcome to LegionDev, We have total "+counter+" viewers"
  
    if __name__=="__main__":
        app.run(debug=True, host="0.0.0.0")
  

• Now Create a new file named as Dockerfile (without any extension)

    FROM python:3.11.0a6-alpine3.15
  
    WORKDIR /app
  
    COPY requirements.txt /app
  
    RUN pip install -r requirements.txt --no-cache-dir
  
    COPY . /app
  
    CMD python app.py
  

• Create requirements.txt file and add the required dependencies

    flask
    redis
  

• Create docker-compose.yaml file

    services:
        redis:
            image: redislabs/redismod
            container_name: redis
            ports:
                - '6379:6379'
        web:
                build: .
                container_name: web
                ports:
                    - "5000:5000"
                volumes:
                    - .:/app
                depends_on:
                    - redis
  

• After setting up the environment Install docker desktop and docker-compose

• Install Docker desktop on Ubuntu(Debian):

  • Download .deb from here: Docker-Desktop.deb (Debian)

  • Now Install prerequisites in order to Install Docker Desktop on ubuntu system

      sudo apt install -y ca-certificates curl gnupg lsb-release
      sudo mkdir -p /etc/apt/keyrings
      curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
      echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
      sudo apt update -y
    

    • Run the below command once you have downloaded DEB package and installed above prerequisites

        sudo apt install ./docker-desktop-<version>-<arch>.deb

• Now push the code into your remote repository which we created in the initial stage

• First Install and setup your git on your system and run the following commands 1 by 1.

    # To update libraries
    sudo apt update
    # To install git
    sudo apt install git
    # To check the installed version
    git --version
  

• Now set your global config profile

    git config --global user.email "youremail@gmail.com"
    git config --global user.name "YourUserName"
  

    git add .
    git commit -m "Added files to repo"
    git push -u origin main
  

• Now open Docker Engine and run following commands

    docker-compose up
  

And that's it now your application is Successfully Dockerized

• To check the running containers run below command:

    docker ps