Containerize a Python application
- You have installed the latest version of Docker Desktop.
- You have a git client. The examples in this section use a command-line based git client, but you can use any client.
This section walks you through containerizing and running a Python application.
The sample application uses the popular Flask framework.
Clone the sample application to use with this guide. Open a terminal, change directory to a directory that you want to work in, and run the following command to clone the repository:
$ git clone https://github.com/docker/python-docker
Now that you have an application, you can use
docker init to create the
necessary Docker assets to containerize your application. Inside the
python-docker directory, run the
docker init command.
docker init provides
some default configuration, but you'll need to answer a few questions about your
application. For example, this application uses Flask to run. Refer to the
following example to answer the prompts from
docker init and use the same
answers for your prompts.
$ docker init
Welcome to the Docker Init CLI!
This utility will walk you through creating the following files with sensible defaults for your project:
Let's get started!
? What application platform does your project use? Python
? What version of Python do you want to use? 3.11.4
? What port do you want your app to listen on? 5000
? What is the command to run your app? python3 -m flask run --host=0.0.0.0
You should now have the following contents in your
│ ├── app.py
│ ├── requirements.txt
│ ├── .dockerignore
│ ├── compose.yaml
│ ├── Dockerfile
│ ├── README.Docker.md
│ └── README.md
To learn more about the files that
docker init added, see the following:
python-docker directory, run the following command in a
$ docker compose up --build
Open a browser and view the application at http://localhost:5000. You should see a simple Flask application.
In the terminal, press
c to stop the application.
You can run the application detached from the terminal by adding the
option. Inside the
python-docker directory, run the following command
in a terminal.
$ docker compose up --build -d
Open a browser and view the application at http://localhost:5000.
You should see a simple Flask application.
In the terminal, run the following command to stop the application.
$ docker compose down
For more information about Compose commands, see the Compose CLI reference.
In this section, you learned how you can containerize and run your Python application using Docker.
In the next section, you'll learn how you can develop your application using containers.