[docs]: Oppdatert backendDeployment.md

docs/backendDeployment.md

@@ -49,6 +49,50 @@ The backend is available at [http://it2810-28.idi.ntnu.no:3001/](http://it2810-2
 
 The systemd service runs under a Linux user with access to the backend directory. The `User` and `WorkingDirectory` settings must match the configuration on the VM.
 
+## Installing the systemd Service
+
+The backend is managed by systemd to ensure that it continues running after SSH logout and starts automatically when the VM boots.
+
+The service configuration is stored in `deploy/t28-backend.service`.
+
+To install the service on the VM, first ensure that the backend dependencies are installed and that `backend/.env` is configured correctly.
+
+The `User` and `WorkingDirectory` values in the service file must match the Linux user and project location on the VM.
+
+Copy the service file to the systemd configuration directory:
+
+```bash
+sudo cp deploy/t28-backend.service /etc/systemd/system/
+```
+
+Reload systemd to register the service:
+
+```bash
+sudo systemctl daemon-reload
+```
+
+Enable the service to start automatically when the VM boots:
+
+```bash
+sudo systemctl enable t28-backend
+```
+
+Start the backend:
+
+```bash
+sudo systemctl start t28-backend
+```
+
+Verify that the service is running:
+
+```bash
+sudo systemctl status t28-backend
+```
+
+The service should show `active (running)`.
+
+These installation steps are only required when setting up the service for the first time or when reinstalling its configuration.
+
 ## Starting and Restarting the Backend
 
 To access the VM through SSH, a connection to the NTNU network or NTNU VPN is required.
@@ -91,6 +135,58 @@ sudo journalctl -u t28-backend -f
 
 The backend is configured to start automatically when the VM reboots, so manual startup is normally unnecessary.
 
+## Updating the Backend
+
+When changes to the backend are merged into the main branch, the running backend on the VM must be updated to use the latest code.
+
+Connect to the NTNU network or VPN and log in to the VM using SSH:
+
+```bash
+ssh <ntnu-username>@it2810-28.idi.ntnu.no
+```
+
+Navigate to the project directory on the VM:
+
+```bash
+cd ~/T28-Project-2
+```
+
+Make sure you are on the main branch and pull the latest changes:
+
+```bash
+git switch main
+git pull origin main
+```
+
+Install or update backend dependencies:
+
+```bash
+cd backend
+npm ci
+```
+
+Restart the systemd service to apply the updated backend code:
+
+```bash
+sudo systemctl restart t28-backend
+```
+
+Verify that the backend is running:
+
+```bash
+sudo systemctl status t28-backend
+```
+
+If the service fails to start, inspect the logs:
+
+```bash
+sudo journalctl -u t28-backend -n 50
+```
+
+The backend should now be running the updated code.
+
+If the systemd service configuration has also changed, copy the updated service file to `/etc/systemd/system/` and run `sudo systemctl daemon-reload` before restarting the service.
+
 ## Database
 
 PostgreSQL runs on the same VM as the backend.
@@ -111,7 +207,7 @@ The backend endpoint is configured through the `VITE_GRAPHQL_URL` environment va
 
 This allows the frontend to communicate with different backend environments without changing the application code.
 
-The configured backend endpoint is `http://it2810-28.idi.ntnu.no:3001/`.
+The configured backend endpoint is [http://it2810-28.idi.ntnu.no:3001/](http://it2810-28.idi.ntnu.no:3001/).
 
 Users interact with the application through the frontend and do not need direct SSH access to the VM or database.