EX188 Container Image Building Practice Question
An administrator needs to execute multiple commands in a single RUN instruction to minimize image layers. Which syntax is standard in a Containerfile?
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
✓
RUN dnf update -y && dnf install -y httpd
Combining commands using shell operators like && within a single RUN instruction reduces the total number of layers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RUN ["dnf update -y", "dnf install -y httpd"]
Why it's wrong here
Exec form runs a single executable, it does not chain shell commands this way.
- ✗
RUN { dnf update -y; dnf install -y httpd; }
Why it's wrong here
Braces without a proper shell context can cause syntax errors depending on the base image shell.
- ✗
RUN dnf update -y dnf install -y httpd
Why it's wrong here
Newline without continuation creates multiple RUN commands/layers.
- ✓
RUN dnf update -y && dnf install -y httpd
Why this is correct
Using && ensures commands run sequentially in the same layer.
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.