EX188 Container Image Building Practice Question
Which THREE practices should be followed to optimize container image size and build caching when writing Containerfiles? (Choose three.)
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
✓
Order Containerfile instructions from least frequently changing to most frequently changing to maximize cache hits.
Caching and layer minimization depend on instruction order, cleanup in the same layer, and avoiding unnecessary tool installation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Order Containerfile instructions from least frequently changing to most frequently changing to maximize cache hits.
Why this is correct
Placing base dependencies before source code maximizes cache reuse.
- ✓
Combine package installation and cache cleanup in a single RUN instruction to prevent cache retention across layers.
Why this is correct
Combining installation and removal in one layer prevents unnecessary storage bloat.
- ✗
Avoid using .containerignore files so that all host files are always cached by Podman.
Why it's wrong here
.containerignore should be used to exclude unnecessary files from the build context.
- ✓
Use multi-stage builds to separate build-time dependencies from the final runtime image.
Why this is correct
Multi-stage builds allow discarding heavy build tools.
- ✗
Install all debugging tools and heavy development SDKs in the final production stage.
Why it's wrong here
Development tools should be avoided in production or left behind in builder stages.
About these practice questions
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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.