# Docker Web Application Deployment

The application consists of two services:

1. **Web Service (Nginx):**
   - Uses the official Nginx image.
   - Listens on port 80 inside the container and is mapped to host port 8080.
2. **Database Service (MySQL 5.7):**
   - Uses the official MySQL 5.7 image.
   - Configured with a root password and a default database.
   - Persists its data using the named volume `mysql-data`.

## Files Overview

- **prepare-app.sh:** 
  - Creates the required Docker network (`myapp-net`) and persistent volume (`mysql-data`).
- **docker-compose.yaml:**
  - Defines the two services along with their ports, environment variables, volumes, and restart policies.
- **start-app.sh:**
  - Starts the services using Docker Compose in detached mode.
  - Displays the URL to access the web service.
- **stop-app.sh:**
  - Stops the running containers without deleting the persistent volume.
- **remove-app.sh:**
  - Removes all the created resources (containers, network, and volume) from the deployment.

## Deployment Instructions

1. **Preparation:**
   - Ensure Docker and Docker Compose are installed.
   - Make the scripts executable:
     ```bash
     chmod +x prepare-app.sh start-app.sh stop-app.sh remove-app.sh
     ```
   - Run the preparation script:
     ```bash
     ./prepare-app.sh
     ```

2. **Starting the Application:**
   - Launch the services by running:
     ```bash
     ./start-app.sh
     ```
   - Open your web browser and navigate to [http://localhost:8080](http://localhost:8080) to see the Nginx welcome page.

3. **Stopping the Application:**
   - Stop the services without losing data:
     ```bash
     ./stop-app.sh
     ```

4. **Removing the Application:**
   - To completely remove all deployed resources, run:
     ```bash
     ./remove-app.sh
     ```

## Notes

- The application uses an external network (`myapp-net`) and a persistent volume (`mysql-data`) that are created in `prepare-app.sh`.
- The Nginx container depends on the MySQL container to demonstrate inter-service communication within the `myapp-net` network.
- Containers are configured to restart on failure.