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Docker Web Application

Overview

This is a Dockerized web application consisting of two services:

Web Service: A simple Python Flask application serving HTTP endpoints.
Database Service: A MySQL 8.0 database that stores its data in a persistent volume.

The web service demonstrates basic functionality and includes an endpoint (/dbtest) to test connectivity with the database service.

Docker: Ensure Docker is installed and running.
Docker Compose: Version 3.8 or later is required to run the multi-container application.

Virtual Network:
A custom Docker network app-network is used to allow seamless communication between containers.
Named Volume:
A persistent volume db_data is defined to store MySQL database data, ensuring data persistence between container restarts.

Web Service Container:
- Image: Custom built from the provided Dockerfile.
- Port: Exposes port 5000.
- Environment Variables: Set for database connectivity (e.g., MYSQL_HOST, MYSQL_USER, MYSQL_PASSWORD, MYSQL_DATABASE).
- Restart Policy: Configured to always restart on failure.
Database Service Container:
- Image: Official mysql:8.0 image.
- Ports: Exposes port 3306.
- Environment Variables: Defines MYSQL_ROOT_PASSWORD and MYSQL_DATABASE for initial configuration.
- Volume: Uses named volume db_data for data persistence.
- Restart Policy: Configured to always restart on failure.

Prepare the Application:
Run the following command to build images and create required networks/volumes:
```
./prepare-app.sh
```

Start the Application: Launch the containers with:

./start-app.sh

You should see a message:
    Running app ...
    The app is available at http://localhost:5000

Interact with the Application:

• Open your web browser and go to http://localhost:5000 to view the home page. • Visit http://localhost:5000/status for the application status. • Visit http://localhost:5000/dbtest to test the database connectivity.
Stop the Application: To stop all running services without removing their state:
```
./stop-app.sh
```
Remove the Application: When you want to completely remove all containers, networks, and volumes:
```
./remove-app.sh
```