305-300 Container Virtualization Practice Question
When building a Dockerfile, which instruction should be used to define the user context for subsequent RUN, CMD, and ENTRYPOINT instructions?
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
✓
USER
The USER instruction sets the UID/GID for processes executed in subsequent steps.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
USER
Why this is correct
This command effectively switches the security context.
- ✗
WORKDIR
Why it's wrong here
This changes the directory, not the user.
- ✗
RUN useradd
Why it's wrong here
This creates a user but does not change the context for the build.
- ✗
AS
Why it's wrong here
This is part of multi-stage build syntax, not user management.
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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 LPI exam blueprint
This 305-300 practice question is part of Courseiva's free LPI 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 305-300 exam.