How to Install a Python WSGI Application

Last modified: Tuesday November 21st, 2023

This article describes how to install a Python™ WSGI web application on the command line.

Python WSGI is a standardized web interface that runs Python applications.

!!!: cPanel doesn’t develop or ship Python WSGI web applications, cPanel Technical Support can’t help you with them, and is not responsible for any data loss.
Note: We recommend that you complete the steps in this document through the command line as a cPanel user unless otherwise noted in the step. Where pythonapp is the application’s name.

If you need more information, please read the Python WSGI documentation.

Install a Python application

Pre-installation settings

Before you start, make sure your hosting provider has installed the following EasyApache 4 packages on your server:

  • mod-passenger
    This module disables Apache’s mod_userdir module.
  • mod-env
    We also recommend that your hosting provider install the  module ea-ruby27-ruby-devel

Also, your hosting provider must install the following packages:

  • python-flask (or another framework)
    We strongly recommend that you use a framework with Python WSGI.
  • pip
    The package name depends on your version of Python.

Install the application

Please follow these steps to install an application:

  1. Log in to the server via SSH as a cPanel user.
  2. Create an application directory relative to your home directory. Run the following command, where directoryname is the application directory:
    mkdir directoryname
  3. Change to the application’s directory. Run the following command, where directoryname is the application directory:
    cd directoryname
  4. Copy this application to your server.
  5. Create a passenger_wsgi.py file. Where pythonapp is your Python application and MyApp is the application function:
    echo "from pythonapp import MyApp as application" > passenger_wsgi.py
  6. Install application dependencies. Create a pip requirements.txt file, after that run the following command:
    pip install –user -r requirements.txt
    Note: Any dependencies also can install in the Ensure Dependencies section of cPanel’s Application Manager interface (cPanel » Home » Software » Application Manager).
    Warning:
    • The version requirements of your dependency must match your version of Python. For example, a dependency that requires Python 2 or earlier will not work in an application that you run with Python 3.
    • Some dependencies will change what your application requires to work. For example, Flask’s render_template dependency requires that you keep your index.html file in a templates folder.

Test the application

After installing the application, make sure that it is active.

  1. Run this command:
    python pythonapp.py

    The output may resemble the following example:

    How to Install a Python WSGI Application python application output
  2. Open another terminal window and log in to the server via SSH as the same cPanel user.
  3. Run this command:
    curl http://localhost:5000 

    The output will be similar to the following example:

    Hello, World!

Register the application

Register the application after installing it. For this, use cPanel’s Application Manager interface (cPanel » Home » Software » Application Manager).

Then you can access the application in a web browser with the following URL:

http://example.com/pythonapp

Restart the application

To restart the application after editing it, create the restart.txt touch file. Create this file in the /tmp directory of the application. This file directs Phusion Passenger® to restart the application after changing it. This action applies your changes to the application

Important:  Phusion Passenger will restart the app only if you touch the restart.txt touch file.
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