stden/my-python-app repository overview

⁠stden/my-python-app

Learn Docker networking with a Python website check and a MySQL query.

⁠Contents

• Python with Requests, Flask, NumPy, and MySQL Connector/Python
• A sample script that checks a website and reads rows from MySQL
• SQL files that create and fill the sample database
• The tree command to show the directory structure

The working directory is /x. The default command runs python ./my-test.py. It requests https://www.google.com, then queries the user table in the database. Requests use a 15-second timeout. A failed website check stops the program before the database query.

It runs once and exits. It does not start a web server.

⁠Tags

View tags and image digests⁠.

⁠Pull and run

docker pull stden/my-python-app:latest
docker run --rm stden/my-python-app:latest \
  python -c 'import requests, flask, numpy, mysql.connector; print("Libraries are ready.")'

To run the full example, prepare a MySQL database with the sample SQL⁠. The database must accept connections before you start the application.

In this example, a MySQL container named db is on the course-net Docker network. Set the database user and password to match your database. change-me is a placeholder.

docker run --rm --network course-net \
  -e DB_HOST=db -e DB_USER=user -e DB_PASSWORD=change-me -e DB_NAME=my_db \
  stden/my-python-app:latest

⁠Run the full course example

The repository includes a Compose file that starts MySQL, creates the sample data, waits for MySQL, and builds the Python application:

git clone https://github.com/stden/docker-gems.git
cd docker-gems
docker compose up --build --abort-on-container-exit --exit-code-from app
docker compose down

The Compose file uses example passwords. The named database volume keeps its data after docker compose down. Use a separate project and credentials for your own application.

⁠Checks and source

GitHub Actions runs the Compose example twice: first with a new volume, then with the same volume.

Dockerfile⁠ · Compose file⁠ · Docker tutorial⁠ · Build results⁠