# Docker Multi-Service Notes Application

## Project Overview

This project is a multi-container web application deployed using Docker. It demonstrates how different services can work together using containerization.

The application allows users to:

- Add and delete notes
- Upload files
- View and download uploaded files

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## Architecture

The application consists of the following services:

**Frontend (Nginx)**
Serves static HTML, CSS, and JavaScript files. Accessible via browser.

**Backend (Node.js + Express)**
Handles API requests and manages notes and file uploads.

**MongoDB**
Stores notes data and uses a persistent Docker volume.

**Mongo Express**
Provides a web interface to view and manage database data.

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## Technologies Used

- Docker and Docker Compose
- Node.js with Express
- MongoDB (NoSQL database)
- Nginx (web server)
- HTML, CSS, and JavaScript

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## Service Ports

| Service       | Port |
|---------------|------|
| Frontend      | 8080 |
| Backend       | 3000 |
| Mongo Express | 8081 |

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## Persistent Storage

The application uses Docker volumes to preserve data across container restarts:

- `mongo-data` stores database records
- `uploads/` stores user-uploaded files

Data is retained even after stopping the application.

---

## How to Run

### 1. Prepare the application

```bash
./prepare-app.sh
```

### 2. Start the application

```bash
./start-app.sh
```

Once running, open the following in your browser:

- Application: `http://147.232.204.210:8080`
- Database UI: `http://147.232.204.210/:8081`

### 3. Stop the application

```bash
./stop-app.sh
```

### 4. Remove the application

```bash
./remove-app.sh
```

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## Application Workflow

1. The user interacts with the frontend in a browser.
2. The frontend sends API requests to the backend.
3. The backend processes the requests and communicates with MongoDB.
4. MongoDB stores or retrieves the relevant data.
5. Mongo Express provides a separate interface to inspect database content directly.

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## Features

- Create and delete notes
- Upload files
- View and download uploaded files
- Persistent storage via Docker volumes