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tutorial: docker compose hot reload for python applications
in this tutorial, we will explore how to set up a python development environment using docker compose with hot reloading. hot reloading allows you to make changes to your code and see the results immediately without the need to rebuild or restart your containers. this can significantly speed up the development process, especially in large projects.
prerequisites:
step 1: setting up your project structure
first, let's create a directory for our project and set up the following structure:
step 2: writing dockerfile
create a dockerfile in the project root directory with the following content:
step 3: writing docker compose configuration
create a docker-compose.yml file in the project root directory with the following content:
step 4: writing the python application
create a main.py file in the app directory with a simple flask application:
step 5: installing dependencies
create a requirements.txt file in the project root directory with the necessary dependencies:
step 6: running the application
open a terminal, navigate to your project directory, and run the following command:
this command will build the docker image using the dockerfile and start the containers defined in the docker-compose.yml file.
step 7: testing hot reloading
now, let's test the hot reloading feature. open the main.py file in your preferred text editor or ide and make a change to the message returned by the hello() function, for example, change 'hello, docker compose hot reload!' to 'hello, world!'.
save the file, and observe that the flask server automatically detects the changes and reloads the application without the need to restart the docker containers.
congratulations! you have successfully set up a python development environment using docker compose with hot reloading. this setup allows you to streamline your development workflow and iterate quickly on your python applications.
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