[Unit]
Description=Photo Application
After=network.target

[Service]
User=<app_user>
Group=<app_user>
WorkingDirectory=/var/lib/<app_user>
Environment=FLASK_DEBUG=0
# apt-get install python3-gunicorn gunicorn
ExecStart=/usr/bin/gunicorn3 --access-logfile '-' -b 127.0.0.1:8200 -w 1 <app_user>:app
Restart=always

[Install]
WantedBy=multi-user.target