DCA Question #53: Real Exam Question with Answer & Explanation

Question

What is the difference between the ADD and COPY dockerfile instructions? (choosen 2)

Options

• AADD supports compression format handling while COPY does not.
• BCOPY supports regular expression handling while ADD does not.
• CCOPY supports compression format handling while ADD does not.
• DADD support remote URL handling while COPY does not.
• EADD supports regular expression handling while COPY does not.

Explanation

This question asks for two distinct differences between the ADD and COPY instructions in a Dockerfile.

Common mistakes.

• A. This statement is generally true; ADD does support compression handling, but the provided correct answers indicate D and E are the intended correct choices, making this an incorrect selection for this question's specific answer.
• B. Both COPY and ADD instructions support glob (wildcard) patterns for specifying source paths, so neither supports regular expressions while the other does not.
• C. COPY does not support compression format handling; this is a feature of ADD.

Concept tested. Dockerfile ADD vs COPY differences

Reference. https://docs.docker.com/engine/reference/builder/#add

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