- A
Add --force to the podman run command
Why wrong: --force is not a valid option for podman run; it is used with podman rm or podman stop to forcefully remove/stop.
- B
Check which process is using port 80 and either stop that process or use a different host port
The correct approach is to identify the conflicting process, stop it if possible, or map the container to an unused host port (e.g., -p 8080:80).
- C
Add --replace to the podman run command
Why wrong: --replace is used with podman create and podman run for pods, not for individual containers; it does not resolve port conflicts.
- D
Use --net=host to bypass the port mapping
Why wrong: Using --net=host makes the container share the host's network stack, but if port 80 is already in use on the host, the container will still fail to bind.
EX200 Manage containers Practice Question
This EX200 practice question tests your understanding of manage containers. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A system administrator is troubleshooting a container that fails to start with the error: 'Error: cannot start container: listen tcp4 :80: bind: address already in use'. The container is intended to serve HTTP traffic on port 80. What is the most appropriate first step to resolve this issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
Check which process is using port 80 and either stop that process or use a different host port
The error 'address already in use' indicates that port 80 on the host is already occupied by another process. The correct first step is to identify that process using commands like `ss -tlnp` or `lsof -i :80` and either stop it or map the container to a different host port (e.g., `-p 8080:80`). This directly resolves the binding conflict without risking data loss or unintended behavior.
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.
- ✗
Add --force to the podman run command
Why it's wrong here
--force is not a valid option for podman run; it is used with podman rm or podman stop to forcefully remove/stop.
- ✓
Check which process is using port 80 and either stop that process or use a different host port
Why this is correct
The correct approach is to identify the conflicting process, stop it if possible, or map the container to an unused host port (e.g., -p 8080:80).
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Add --replace to the podman run command
Why it's wrong here
--replace is used with podman create and podman run for pods, not for individual containers; it does not resolve port conflicts.
- ✗
Use --net=host to bypass the port mapping
Why it's wrong here
Using --net=host makes the container share the host's network stack, but if port 80 is already in use on the host, the container will still fail to bind.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse container-level options like `--replace` or `--force` with host-level port management, or assume `--net=host` bypasses port conflicts, when in fact it still requires the port to be available on the host.
Detailed technical explanation
How to think about this question
Under the hood, when a container binds to a host port, Podman uses the host's network namespace to create a TCP listener. The kernel enforces that only one socket can bind to a given IP:port combination (SO_REUSEADDR can allow multiple sockets under specific conditions, but not for TCP listeners with conflicting addresses). In a real-world scenario, a common culprit is a previously running container that was not cleaned up, or a system service like nginx or Apache already listening on port 80.
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 practitioner preparing for the EX200 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Manage containers — study guide chapter
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FAQ
Questions learners often ask
What does this EX200 question test?
Manage containers — This question tests Manage containers — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check which process is using port 80 and either stop that process or use a different host port — The error 'address already in use' indicates that port 80 on the host is already occupied by another process. The correct first step is to identify that process using commands like `ss -tlnp` or `lsof -i :80` and either stop it or map the container to a different host port (e.g., `-p 8080:80`). This directly resolves the binding conflict without risking data loss or unintended behavior.
What should I do if I get this EX200 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
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