An upstart systemd service for running Flask with gunicorn

flaskapp.service

[Unit]
Description=Gunicorn instance to serve a flask api
After=network.target

[Service]
User=<user>
Group=www-data
WorkingDirectory=/home/<user>/flask_api
EnvironmentFile=/home/<user>/flask_api/.env # Specify app environment variables 
Environment="PATH=/home/<user>/flask_api/venv/bin" # Ensure venv is setup
ExecStart=/home/<user>/flask_api/venv/bin/gunicorn --workers 1 --bind unix:flask_api.sock -m 007 wsgi:app

[Install]
WantedBy=multi-user.target