Add installation/updating.md

installation/updating.md

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+## Updating Your Deployed DLLs
+
+When you publish a new version of your .NET Web API DLL or rename the DLL file, you need to update your systemd service file accordingly to ensure the service runs the correct binary.
+
+### Which Files to Edit
+
+1. **Systemd Service File**
+
+- Path: `/etc/systemd/system/mydotnetapi.service`
+- Purpose: Defines how your API service is started and managed on Debian.
+- Key section to update: `ExecStart`
+
+### Example
+
+Suppose your new DLL filename is `NewApi.dll` instead of `Taekwondo.WebApi.dll`. Update the service file by changing the `ExecStart` line:
+
+```ini
+[Unit]
+Description=My .NET Web API
+After=network.target
+
+[Service]
+WorkingDirectory=/opt/api
+ExecStart=/usr/bin/dotnet /opt/api/NewApi.dll
+Restart=always
+RestartSec=10
+SyslogIdentifier=dotnet-api
+User=www-data
+Environment=ASPNETCORE_ENVIRONMENT=Production
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Then reload systemd and restart the service to apply changes:
+
+```bash
+sudo systemctl daemon-reload
+sudo systemctl restart mydotnetapi
+sudo systemctl status mydotnetapi
+```
+
+***
+
+2. **Application Configuration Files (Optional)**
+
+- Example: `/opt/api/appsettings.json`
+- Purpose: Contains connection strings and other runtime settings.
+- Edit if your new DLL version requires different settings.
+
+***
+
+### Summary
+
+- Always update the `ExecStart` path in the systemd service file to point to your new DLL file.
+- Reload and restart the service after modification.
+- Update any runtime configuration files if needed.
+
+***
+
+This process ensures your deployed API runs the correct version after updating DLLs, guaranteeing smooth service operation on your Debian LXC environment.