Creating Custom Docker Images

Why build custom images? They let you package your specific application, its dependencies, and configuration into a single, portable unit. This is key for consistency and easy deployment.

You define how to build this image using a file called a Dockerfile.

We'll containerize a super simple Python Flask web app. It just returns "Hello from Docker!" when you visit its web address.

Imagine we have these files in a directory:

• app.py: The Python application code
• requirements.txt: Lists Python dependencies
• Dockerfile: Instructions for building the image