Docker a complete Hands-On experience using Docker-Compose

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
```

Docker a complete Hands-On experience using Docker-Compose

Introduction

Setting up the environment

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