python flask docker tutorial
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Title: Building and Dockerizing a Python Flask Application: A Step-by-Step Tutorial
In this tutorial, we'll guide you through the process of creating a simple Python Flask web application and then containerizing it using Docker. Docker allows you to package your application along with its dependencies into a standardized unit called a container, ensuring that it runs consistently across different environments.
Before you start, make sure you have the following installed on your system:
Let's start by creating a basic Flask application. Open your favorite text editor and create a file named app.py. Add the following code:
This simple Flask app has a single route that returns a "Hello, Dockerized Flask App!" message.
Create a file named requirements.txt to list the Python dependencies for your Flask app:
Run the following command to install the dependencies:
Now, let's create a Dockerfile to define the Docker image for your Flask application. Create a file named Dockerfile (without any file extension) and add the following content:
This Dockerfile specifies a lightweight Python base image, sets the working directory, copies the application files, installs dependencies, exposes port 5000, and defines the command to run the application.
Navigate to the directory containing your Dockerfile and run the following command to build the Docker image:
This command creates a Docker image named flask-docker-tutorial.
Now that we have the Docker image, let's run a container:
Visit http://localhost:5000 in your web browser, and you should see the "Hello, Dockerized Flask App!" message.
Congratulations! You've successfully created a Python Flask application and containerized it using Docker. This basic setup can be a starting point for more complex applications and deployments.
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