Installing and Configuring Gunicorn on Ubuntu

Gunicorn is a Python Web Server Gateway Interface HTTP server. It is a pre-fork worker model, which means that the master process forks several worker processes that can handle client requests in parallel. Gunicorn is widely used with web frameworks, such as Flask and Django, to deploy Python web applications.

To install Gunicorn on Ubuntu, run the following command:

sudo apt-get install gunicorn

To start Gunicorn, you need to specify the location of the application, the name of the Python module, and the name of the application instance. For example, if your application is located at /var/www/myapp, and the name of the Python module is app, and the name of the application instance is application, you can start Gunicorn with the following command:

gunicorn --bind 0.0.0.0:8000 myapp.app:application

You can also configure Gunicorn to use a configuration file to specify the location of the application, the number of worker processes, and other options. To create a Gunicorn configuration file, create a file called gunicorn.conf.py in your application directory, and add the following code:

bind = "0.0.0.0:8000"
workers = 4
user = "www-data"

To start Gunicorn with the configuration file, run the following command:

gunicorn --config /var/www/myapp/gunicorn.conf.py myapp.app:application