How to deploy flask in gunicorn

The steps for Gunicorn to deploy a Flask application are as follows: 1. Enter the "pip install gunicorn" command in the terminal or command line to install Gunicorn; 2. Create a Flask application; 3. Enter "flask" in the terminal or command line run" command to start the Flask application; 4. Enter the "gunicorn app:app" command in the terminal or command line to deploy the Flask application using Gunicorn; 5. Adjust the Gunicorn configuration.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Gunicorn is a Python WSGI HTTP server that can be used to deploy Flask applications. Here are the steps to deploy a Flask app using Gunicorn:

1. Install Gunicorn: Enter the following command in the terminal or command line to install Gunicorn:

pip install gunicorn

2. Create Flask Application: Create a Python file named app.py (or something else) in the root directory of your Flask application and define a Flask application object named app in it. For example:

   from flask import Flask

   app = Flask(__name__)

   @app.route('/')
   def hello():
       return 'Hello, World!'

3. Start the Flask application: Enter the following command in the terminal or command line to start the Flask application:

flask run

If everything is fine, you You will be able to access http://localhost:5000/ in your browser and see the "Hello, World!" output.

4. Deploy a Flask application: Enter the following command in the terminal or command line to deploy a Flask application using Gunicorn:

gunicorn app:app

Where, the first app represents the Python file defines the variable name of the Flask application, and the second app represents the name of the Flask application object. If everything goes well, Gunicorn will start and listen on port 8000 (the default value). You can visit http://localhost:8000/ in your browser and see the "Hello, World!" output.

5. Tweak Gunicorn configuration: You can use Gunicorn's command line parameters to adjust its behavior. For example, you can specify the listening port using the following command:

gunicorn app:app --bind 0.0.0.0:8080

This will cause Gunicorn to listen on port 8080 and allow external network access.

The above are the steps for deploying Flask applications using Gunicorn. You can adjust Gunicorn's configuration to your needs to better meet the needs of your application.

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