EX188 Container Image Building Practice Question
You want to build an image that has a build-time argument named 'VERSION'. How do you declare this variable inside the Containerfile so it can be used during the build steps?
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
✓
ARG VERSION
The ARG instruction defines a variable that users can pass at build-time with podman build --build-arg <var>=<value>.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DEFINE VERSION
Why it's wrong here
DEFINE is not a valid instruction.
- ✓
ARG VERSION
Why this is correct
ARG defines variables that are accessible during the build process.
- ✗
ENV VERSION=1.0
Why it's wrong here
ENV makes variables persistent in the final image, which may not be desired for build-only arguments.
- ✗
VAR VERSION
Why it's wrong here
VAR is not a valid instruction.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Red Hat exam blueprint
This EX188 practice question is part of Courseiva's free Red Hat certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the EX188 exam.