Start python flask webserver automatically after booting the system and keep it on till the end

I'd like to suggest using supervisor, the documentation is here

for a very simple demo purpose, after you installed it and finish the set up, touch a new a file like this:

[program:flask_app]                                                                  command = python main.py                                      directory = /dir/to/your/app                            autostart = true                                                                autorestart = true

then

$ sudo supervisorctl update

Now, you should be good to go. The flask app will start every time after you boot you machine.(note: distribution package has already integrated into the service management infrastructure, if you're using others, see here)

to check whether you app is running:

$ sudo supervisorctl status

For production, you can use nginx+uwsgi+supervisor. The flask deployment documentation is here

One well documented solution is to use Gunicorn and Nginx server:

1. Install Components and setup a Python virtualenv with dependencies
2. Create the wsgi.py file :

from myproject import application    if __name__ == "__main__":         application.run()

That will be handled by Gunicorn :

gunicorn --bind 0.0.0.0:8000 wsgi

3. Configure Gunicorn with setting up a systemd config file: /etc/systemd/system/myproject.service :

 [Unit]    Description=Gunicorn instance to serve myproject    After=network.target [Service]    User=sammy    Group=www-data    WorkingDirectory=/home/sammy/myproject    Environment="PATH=/home/sammy/myproject/myprojectenv/bin"    ExecStart=/home/sammy/myproject/myprojectenv/bin/gunicorn     --workers 3 --bind unix:myproject.sock -m 007 wsgi:app[Install]    WantedBy=multi-user.target

4. Start the Gunicorn service at boot :

    sudo systemctl start myproject    sudo systemctl enable myproject