Web Reference: For this exercise, you'll pretend you're starting from scratch and will create a new Dockerfile. Create a file named Dockerfile in the getting-started-todo-app/app/ folder. It's important to note that the Dockerfile has no file extension. Some editors will automatically add an extension to the file (or complain it doesn't have one). Dec 1, 2025 · A beginner-friendly guide to Dockerfile - understand its structure, important commands and how Docker builds images using step-by-step examples. Learn how to write a Dockerfile with essential instructions like FROM, COPY, RUN, and CMD. Build a simple Python app.
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