Python Flask Production Web Server

Setting Up a Flask Production Web Server

Python Flask is a popular micro web framework that allows developers to build web applications quickly and easily. While Flask comes with a built-in development server, it is not suitable for production environments due to its limited capabilities and potential security vulnerabilities. In this article, we will explore how to set up a Flask production web server to ensure optimal performance, security, and scalability.

Choosing a Production Web Server

Before diving into the setup process, it is crucial to choose the right production web server for your Flask application. There are several options available, including Gunicorn, uWSGI, and Nginx. These servers provide better performance and security features compared to the Flask development server. For this article, we will focus on using Gunicorn as our production web server.

Installing Gunicorn

To get started, we need to install Gunicorn on our server. Gunicorn can be installed using pip, the package installer for Python. Open your terminal or command prompt and execute the following command:

pip install gunicorn

This will download and install Gunicorn along with its dependencies. Once the installation is complete, we can proceed with the setup process.

Configuring Gunicorn

After installing Gunicorn, we need to configure it to run our Flask application. Create a new file called in your project’s directory and add the following code:

bind ="" workers = 4 

The bind option specifies the address and port on which Gunicorn will listen for incoming requests. In this example, we set it to, which means Gunicorn will bind to all available network interfaces on port 8000. You can change this to any desired address and port combination.

The workers option determines the number of worker processes that Gunicorn will spawn to handle incoming requests. This value depends on your server’s hardware capabilities and the expected traffic to your application. For most small to medium-sized applications, 4 workers should be sufficient.

Running Gunicorn

With the configuration in place, we can now run Gunicorn to start our Flask application. Open your terminal or command prompt, navigate to your project’s directory, and execute the following command:

gunicorn -c app:app

This command tells Gunicorn to use the configuration file we created earlier and run the Flask application defined in the file. Replace app:app with the appropriate module and Flask application name for your project.

Testing the Production Web Server

Once Gunicorn is up and running, you can test your production web server by accessing your Flask application through the specified address and port. Open your web browser and enter the following URL:


Replace your_server_ip with the IP address or domain name of your server. If everything is configured correctly, you should see your Flask application running on the production web server.

Benefits of Using a Flask Production Web Server

Setting up a Flask production web server offers several benefits over using the built-in development server. Let’s explore some of these advantages:

Improved Performance

The production web server is optimized for handling a large number of concurrent requests. It utilizes advanced techniques like load balancing and multiprocessing to ensure optimal performance even under heavy traffic.

Better Security

The development server is not designed with security in mind and may expose potential vulnerabilities in your application. On the other hand, production web servers like Gunicorn provide additional security features such as access control, request filtering, and SSL/TLS encryption.


As your application grows, you may need to handle an increasing number of users and requests. A production web server allows you to scale your application horizontally by adding more servers or vertically by increasing the server’s hardware resources.

Server Monitoring and Logging

Production web servers often come with built-in monitoring and logging capabilities. These features allow you to track the performance of your application, identify bottlenecks, and troubleshoot any issues that may arise.


Setting up a Flask production web server is essential to ensure the optimal performance, security, and scalability of your web application. By choosing a suitable production web server like Gunicorn and following the configuration and setup steps outlined in this article, you can confidently deploy your Flask application in a production environment. Remember to monitor your server’s performance regularly and make necessary optimizations as your application grows. Happy coding!