Build a Multi-Stage Image

Build tools do not belong in a runtime image. Use two stages - one to compile, one to ship - so the final image only carries what the application needs to run.

Validator

⏱ 0:00

IDLE — checks run live as you type commands; submit when done

01Requirements

live checks

File ~/app/Dockerfile declares two build stages○
The runtime stage copies artifacts from the build stage○
A container from app:multistage is running and mapped to port 8082○

02Walkthrough

1 of 10 revealed

01
Create the app directory
The Dockerfile lives next to the code it packages.
mkdir ~/app
9 locked · each failed submit reveals one

03Stuck?

0 of 3 revealed

Take a hint without losing the lab — each one points at the thing to look at, not at the answer.

04AI Tutor

guides, never solves

Tell me what you're stuck on — I'll nudge, not solve. Which requirement are you looking at?

04Notebook

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learner@lab — docker:24

Session is disposable

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Run the Container as a Non-Root User

Docker

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Write Your First GitHub Actions Workflow

CI/CD