- A
podman run -d -p 8080:80 nginx
Correct: -d for detached, -p 8080:80 maps host 8080 to container 80.
- B
podman run -d -p 80:8080 nginx
Why wrong: Port mapping reversed; should be host:container.
- C
podman run -d --expose 80 nginx
Why wrong: --expose only exposes port, does not publish.
- D
podman run -d -P 8080:80 nginx
Why wrong: -P maps random ports, not specified.
Question 259 of 537
EX200 Manage containers Practice Question
This EX200 practice question tests your understanding of manage containers. 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.
A system administrator needs to run a container that remains running in the background and executes a web server. Which podman command will correctly run the container detached and map host port 8080 to container port 80?
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
✓
podman run -d -p 8080:80 nginx
Option A is correct because `podman run -d` runs the container in detached mode (background), and `-p 8080:80` maps host port 8080 to container port 80, which is the standard port for the nginx web server. This allows external traffic on host port 8080 to be forwarded to the nginx service inside the container.
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.
- ✓
podman run -d -p 8080:80 nginx
Why this is correct
Correct: -d for detached, -p 8080:80 maps host 8080 to container 80.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
podman run -d -p 80:8080 nginx
Why it's wrong here
Port mapping reversed; should be host:container.
- ✗
podman run -d --expose 80 nginx
Why it's wrong here
--expose only exposes port, does not publish.
- ✗
podman run -d -P 8080:80 nginx
Why it's wrong here
-P maps random ports, not specified.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing the order of the port mapping (`host_port:container_port`) with the reverse, and mistaking `--expose` for a functional port publishing mechanism instead of a documentation-only flag.
Detailed technical explanation
How to think about this question
The `-p` flag uses iptables or nftables rules (via CNI or netavark) to create a DNAT rule that forwards traffic from the host IP:port to the container's network namespace. In rootless Podman, port mapping uses slirp4netns or pasta, which requires the `net.ipv4.ip_unprivileged_port_start` sysctl to be set appropriately for ports below 1024. A real-world scenario is running multiple web server containers on the same host, each mapped to a different host port (e.g., 8080, 8081) to avoid conflicts.
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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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: podman run -d -p 8080:80 nginx — Option A is correct because `podman run -d` runs the container in detached mode (background), and `-p 8080:80` maps host port 8080 to container port 80, which is the standard port for the nginx web server. This allows external traffic on host port 8080 to be forwarded to the nginx service inside the container.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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