hardMultiple ChoiceObjective-mapped
XK0-006 Practice Question: A system administrator is troubleshooting a…
A system administrator is troubleshooting a Docker container that exits immediately after starting. The container is built from a minimal image that runs a short-lived command. Which change will keep the container running?
⚠ Common exam trap
CompTIA often tests the misconception that detached mode (`-d`) or restart policies (`--restart=always`) can keep a container running indefinitely, but the core requirement is that the container's main process must not terminate.
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
✓
Modify the Dockerfile to use CMD ["sh"] instead of CMD ["echo", "hello"]
The container exits immediately when its main process finishes. By changing the CMD from `["echo", "hello"]` (which prints a message and exits) to `["sh"]`, the container runs an interactive shell that waits for input, keeping the process alive and the container running. In Docker, a container lives only as long as its PID 1 process runs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Modify the Dockerfile to use CMD ["sh"] instead of CMD ["echo", "hello"]
Why this is correct
Running a shell as the main process will keep the container running indefinitely.
- ✗
Use -d flag to run in detached mode
Why it's wrong here
Detached mode does not prevent the process from exiting; it just runs in the background.
- ✗
Restart the container with --restart=always
Why it's wrong here
This will keep restarting the container but it will still exit immediately each time, causing a continuous restart loop.
- ✗
Allocate a pseudo-TTY with -t flag
Why it's wrong here
Allocating a TTY alone does not keep the container running; the process must still be long-lived.
Go deeper
Related to this question
Learn chapter
Process Management and System Monitoring
Key term
Process
In IT service management, a process is a structured set of activities designed to accomplish a specific objective, such as managing incidents or changes, by transforming inputs into defined outputs.
Key term
Shell
A shell is a computer program that provides a user interface to access an operating system's services, typically by accepting text commands.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA 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 XK0-006 exam.