EX188 Container Image Building Practice Question
Which THREE statements correctly describe the differences between CMD and ENTRYPOINT 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
✓
Combining ENTRYPOINT and CMD allows default arguments to be supplied while retaining override flexibility.
ENTRYPOINT configures a container that will run as an executable; parameters in CMD can act as defaults or be overridden; and using exec form for ENTRYPOINT prevents container processes from receiving signals if not handled carefully, whereas shell form runs inside /bin/sh.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ENTRYPOINT instructions cannot be overridden at runtime under any circumstances.
Why it's wrong here
ENTRYPOINT can be overridden at runtime using the --entrypoint flag with podman run.
- ✓
Combining ENTRYPOINT and CMD allows default arguments to be supplied while retaining override flexibility.
Why this is correct
This pairing is a common best practice for flexible yet rigid executable containers.
- ✓
ENTRYPOINT allows configuring an image that runs as a specific dedicated executable.
Why this is correct
ENTRYPOINT sets the default application binary executed when the container starts.
- ✓
CMD arguments can be easily overridden by arguments passed to 'podman run'.
Why this is correct
Arguments passed to podman run append to or replace CMD defaults.
- ✗
CMD and ENTRYPOINT perform identical functions with no syntactical differences.
Why it's wrong here
They have distinct behaviors regarding argument overriding and executable definition.
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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
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