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+# Smart Share Hub – Secure Cloud File & Note Sharing Platform
+
+## Overview
+
+Smart Share Hub is a cloud-based web application deployed using Docker containers on a Linux virtual machine. The application allows users to:
+
+- Upload and share files
+- Create and share notes
+- Access the application publicly through a web browser
+- Use HTTPS encryption
+- Store persistent data using PostgreSQL and Docker volumes
+
+> Developed for the Cloud Technologies assignment.
+
+---
+
+## Features
+
+### File Upload System
+- Upload files through the web interface
+- Files stored persistently inside a Docker volume
+- Accessible through the browser
+
+### Shared Notes
+- Users can create notes
+- Notes are stored in a PostgreSQL database
+- Notes can be viewed publicly
+
+### HTTPS Support
+- Application accessible through HTTPS
+- SSL/TLS certificate configured
+- Secure encrypted communication
+
+### Docker-Based Deployment
+- Fully containerized application
+- Easy deployment using Docker Compose
+- Repeatable deployment using scripts
+
+### Automatic Restart
+- Containers restart automatically after failure
+- Uses Docker restart policies
+
+### Backup Support
+- Backup script included
+- Application data can be archived easily
+
+### Persistent Storage
+- PostgreSQL database volume
+- Upload storage volume
+
+### Environment Variable Configuration
+- Database secrets stored in `.env`
+- Sensitive data excluded from Git repository
+
+### Logging
+- NGINX access logs available
+- Backend logs accessible through Docker
+
+---
+
+## Technologies Used
+
+| Layer | Technology |
+|---|---|
+| Backend | Python, Flask, psycopg2 |
+| Database | PostgreSQL 15 |
+| Frontend | HTML, CSS, JavaScript |
+| Reverse Proxy | NGINX |
+| Containerization | Docker, Docker Compose |
+
+---
+
+## System Architecture
+
+The application consists of four containers:
+
+| Container | Purpose |
+|---|---|
+| `frontend` | Serves frontend web files |
+| `backend` | Flask API server |
+| `postgres` | PostgreSQL database |
+| `nginx` | Reverse proxy and HTTPS |
+
+---
+
+## Environment Variables
+
+Secrets are stored using environment variables. Create a `.env` file in the project root:
+
+```env
+DB_PASSWORD=postgres123
+```
+
+> The `.env` file is excluded from Git using `.gitignore`.
+
+---
+
+## Docker Compose
+
+The main deployment file is `docker-compose.yml`.
+
+```bash
+# Start application
+docker-compose up -d --build
+
+# Stop application
+docker-compose down
+
+# Remove everything including volumes
+docker-compose down -v
+```
+
+**Database configuration example:**
+
+```yaml
+environment:
+  POSTGRES_DB: smartshare
+  POSTGRES_USER: postgres
+  POSTGRES_PASSWORD: ${DB_PASSWORD}
+```
+
+---
+
+## Deployment Instructions
+
+### 1. Install Docker
+
+```bash
+sudo apt update
+sudo apt install docker.io docker-compose -y
+```
+
+### 2. Clone Repository
+
+```bash
+git clone <repository-url>
+cd sk1
+```
+
+### 3. Create Environment File
+
+```bash
+nano .env
+```
+
+Add the following:
+
+```env
+DB_PASSWORD=postgres123
+```
+
+### 4. Start Application
+
+```bash
+docker-compose up -d --build
+```
+
+---
+
+## Public Access
+
+The application is publicly accessible at:
+
+```
+https://your-domain
+```
+
+Example:
+
+```
+https://joblin-share.duckdns.org
+```
+
+---
+
+## HTTPS Configuration
+
+HTTPS is configured using:
+- NGINX reverse proxy
+- SSL/TLS certificates
+
+All traffic is redirected through the secure HTTPS protocol.
+
+---
+
+## Persistent Storage
+
+| Volume | Purpose |
+|---|---|
+| `postgres_data` | PostgreSQL database storage |
+| `uploads` | Uploaded files |
+
+Data remains intact after container restarts.
+
+---
+
+## Automatic Restart Policy
+
+All containers are configured with:
+
+```yaml
+restart: always
+```
+
+This ensures automatic recovery after crashes or server reboots.
+
+---
+
+## NGINX Reverse Proxy
+
+NGINX handles:
+- HTTPS termination
+- Reverse proxy routing
+- Static frontend delivery
+- API request forwarding
+
+| Route | Target |
+|---|---|
+| `/` | Frontend |
+| `/api/` | Backend API |
+
+---
+
+## Security Features
+
+- HTTPS encryption
+- Environment-based secret management
+- Docker network isolation
+- Reverse proxy protection
+
+---
+
+## Backup System
+
+Run the backup script:
+
+```bash
+./backup.sh
+```
+
+The script:
+- Creates compressed backups
+- Stores them inside `/backups`
+- Can be used for recovery
+
+Example backup file:
+
+```
+backup_2026-05-12.tar.gz
+```
+
+---
+
+## Scripts
+
+| Script | Description | Usage |
+|---|---|---|
+| `prepare-app.sh` | Starts the application automatically | `./prepare-app.sh` |
+| `remove-app.sh` | Stops and removes all containers | `./remove-app.sh` |
+| `backup.sh` | Creates a compressed application backup | `./backup.sh` |
+
+---
+
+## Logs
+
+```bash
+# NGINX access logs
+docker logs nginx
+
+# Backend application logs
+docker logs backend
+
+# PostgreSQL logs
+docker logs postgres
+```