1. **Initial Setup**:
   - The script first checks if it's running as root (administrator), which is required for system changes
   - It defines important variables like ports and file paths that will be used

2. **ZeroTier Installation**:
   - Installs ZeroTier One client using their official installer
   - Joins your ZeroTier network (you'll need to put in ssh with your actual network ID)

3. **Network Configuration**:
   - Waits for the ZeroTier network connection to establish
   - Gets your ZeroTier IP address (the address assigned to your server on the ZeroTier network)

4. **Backup Creation**:
   - Creates backup copies of your nginx configuration and database
   - This is a safety measure in case you need to revert changes

5. **Service Configuration**:
   - Modifies the nginx configuration to only listen on your ZeroTier IP address
   - Updates the firewall rules in the SQLite database to:
     - Remove existing rules for SSH and CloudPanel ports
     - Add new rules that only allow access from your ZeroTier IP

6. **Service Restart**:
   - Restarts nginx and SSH services to apply the changes
   - Verifies ZeroTier connection status

To use this script:

1. Save it to a file (e.g., `setup-zerotier.sh`)
2. Replace `YOUR_NETWORK_ID_HERE` with your actual ZeroTier network ID
3. Make it executable: `chmod +x setup-zerotier.sh`
4. Run it as root: `sudo ./setup-zerotier.sh`

Important Notes:
- Keep your backup files safe in case you need to restore
- After running this script, you'll only be able to access SSH and CloudPanel through ZeroTier
- Double-check your ZeroTier network ID before running
- Make sure you have access to your server through ZeroTier before running this script
- Test the connection through ZeroTier before logging out of your current session