gunicorn

systemd/pytorrent.service

@@ -1,16 +1,23 @@
 [Unit]
 Description=pyTorrent web UI for rTorrent
-After=network.target
+After=network-online.target
+Wants=network-online.target
 
 [Service]
 Type=simple
 WorkingDirectory=/opt/pytorrent
+Environment="PYTHONUNBUFFERED=1"
 EnvironmentFile=/opt/pytorrent/.env
-ExecStart=/opt/pytorrent/venv/bin/python /opt/pytorrent/app.py
+# Note: threaded Gunicorn preserves Flask-SocketIO background tasks without running Werkzeug in production.
+ExecStart=/opt/pytorrent/venv/bin/gunicorn --worker-class gthread --workers 1 --threads 32 --bind ${PYTORRENT_HOST}:${PYTORRENT_PORT} --access-logfile - --error-logfile - wsgi:app
 Restart=always
 RestartSec=3
+KillSignal=SIGINT
+TimeoutStopSec=20
 User=www-data
 Group=www-data
+NoNewPrivileges=true
+PrivateTmp=true
 
 [Install]
 WantedBy=multi-user.target