The answer is that the container was stopped manually with docker stop. Exit code 0 signifies a successful termination, meaning the container’s main process—its entrypoint or command—completed its task without errors. When you run docker stop, it sends a SIGTERM signal to the container’s PID 1, allowing the process to shut down gracefully; if the process handles that signal and exits cleanly, the exit code will be 0. On the CompTIA Linux+ XK0-005 exam, this question tests your understanding of container lifecycle management and signal handling—a common trap is assuming exit code 0 always means the container finished its work, but it can also result from a clean manual stop. Remember the memory tip: “Zero is a hero, but it doesn’t mean the job was done—it just means the exit was clean.”
XK0-005 Scripting, Containers and Automation Practice Question
This XK0-005 practice question tests your understanding of scripting, containers and automation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
Exhibit:
$ podman ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a1b2c3d4e5f6 docker.io/library/nginx:latest nginx -g 'daemon of… 2 hours ago Up 2 hours (unhealthy) 0.0.0.0:80->80/tcp web1
f6e5d4c3b2a1 docker.io/library/nginx:latest nginx -g 'daemon of… 3 hours ago Exited (0) 3 hours ago web2
A container named web2 exited with status 0. Which of the following is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Refer to the exhibit.
Exhibit:
$ podman ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a1b2c3d4e5f6 docker.io/library/nginx:latest nginx -g 'daemon of… 2 hours ago Up 2 hours (unhealthy) 0.0.0.0:80->80/tcp web1
f6e5d4c3b2a1 docker.io/library/nginx:latest nginx -g 'daemon of… 3 hours ago Exited (0) 3 hours ago web2
A
The container ran a task and completed
Why wrong: Nginx is a daemon, not a one-time task.
B
The container's entrypoint crashed
Why wrong: A crash would typically result in a non-zero exit code.
C
The container was stopped manually with docker stop
docker stop sends SIGTERM, causing a clean exit with code 0.
D
The container ran out of memory
Why wrong: Out-of-memory kills result in exit code 137, not 0.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The container was stopped manually with docker stop
Exit code 0 indicates a successful termination. When a container exits with status 0, it means the main process (entrypoint or command) completed its task without errors. Option C is correct because `docker stop` sends a SIGTERM signal to the container's PID 1, allowing it to shut down gracefully; if the process handles the signal and exits cleanly, the exit code will be 0.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The container ran a task and completed
Why it's wrong here
Nginx is a daemon, not a one-time task.
✗
The container's entrypoint crashed
Why it's wrong here
A crash would typically result in a non-zero exit code.
✓
The container was stopped manually with docker stop
Why this is correct
docker stop sends SIGTERM, causing a clean exit with code 0.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The container ran out of memory
Why it's wrong here
Out-of-memory kills result in exit code 137, not 0.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume exit code 0 always means the container completed its intended work, but Cisco tests the nuance that a manual `docker stop` can also produce exit code 0 if the process handles the shutdown gracefully.
Detailed technical explanation
How to think about this question
Under the hood, `docker stop` first sends a SIGTERM to the container's PID 1, then waits for a configurable timeout (default 10 seconds) before sending SIGKILL. If the process handles SIGTERM and exits cleanly, the exit code reflects the process's return value (often 0). In contrast, `docker kill` sends SIGKILL immediately, forcing exit code 137. Understanding the difference between graceful and forced termination is critical for debugging container lifecycle issues in production.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The container was stopped manually with docker stop — Exit code 0 indicates a successful termination. When a container exits with status 0, it means the main process (entrypoint or command) completed its task without errors. Option C is correct because `docker stop` sends a SIGTERM signal to the container's PID 1, allowing it to shut down gracefully; if the process handles the signal and exits cleanly, the exit code will be 0.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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