XK0-006 Automation, Orchestration, and Scripting Practice Question
A DevOps engineer is building a Docker image for a web application. They want to ensure the image is as small as possible and that sensitive data is not left in layers. Which two practices help achieve these goals? (Choose TWO.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Using multi-stage builds to separate build and runtime environments.
Combining RUN commands reduces layers, and using multi-stage builds avoids including build tools in the final image.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Using the ADD instruction instead of COPY.
Why it's wrong here
ADD has extra features (e.g., tar extraction) and is not recommended for simple copy.
- ✓
Using multi-stage builds to separate build and runtime environments.
Why this is correct
Keeps final image clean.
- ✓
Combining multiple RUN commands into one using &&.
Why this is correct
Reduces number of layers.
- ✗
Using the latest tag for base images.
Why it's wrong here
Using latest can lead to unpredictable builds and larger images.
- ✗
Installing all packages in a single layer.
Why it's wrong here
This is already implied by using RUN commands; not a specific practice.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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