XK0-006 Automation, Orchestration, and Scripting Practice Question
A Linux administrator needs to run a Docker container in detached mode with port mapping from host port 8080 to container port 80, and mount a host directory /data to /app/data inside the container. Which command achieves this?
⚠ Common exam trap
Many exam-takers confuse `-p` (specific port mapping) with `-P` (publish all exposed ports to random host ports), and mixing up `docker run` with `docker start`; candidates may also overlook that `-it` is not detached mode.
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
✓
docker run -d -p 8080:80 -v /data:/app/data --name webapp nginx
It uses `docker run -d` to start the container in detached mode (background), `-p 8080:80` to map host port 8080 to container port 80, and `-v /data:/app/data` to bind-mount the host directory `/data` to the container path `/app/data`. The `--name webapp` assigns a friendly name, and `nginx` specifies the image. This combination exactly matches all requirements.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
docker run -d -p 8080:80 -v /data:/app/data --name webapp nginx
Why this is correct
The -d flag detaches the container, -p 8080:80 maps host port 8080 to container port 80, and -v /data:/app/data bind-mounts the host directory. Together these satisfy every stated constraint in a single command, using the nginx image.
- ✗
docker run -it -p 8080:80 -v /data:/app/data --name webapp nginx
Why it's wrong here
The -it flags allocate an interactive TTY and attach to the foreground, contradicting the detached-mode requirement that -d satisfies. It is tempting because -p 8080:80 and the -v /data:/app/data bind mount are exactly right, so only the mode flag is wrong.
- ✗
docker run -d -P -v /data:/app/data --name webapp nginx
Why it's wrong here
-P publishes every exposed container port to random ephemeral host ports, so host port 8080 is not mapped to container port 80. It is tempting because -d and the /data:/app/data bind mount are correct; -P suits throwaway containers where the host port is irrelevant.
- ✗
docker start -d -p 8080:80 -v /data:/app/data webapp
Why it's wrong here
docker start only restarts an existing stopped container; it accepts no -p or -v flags, so the port mapping and bind mount are never applied. It is tempting because it targets the named webapp container, and would be right for restarting a container already created with those settings.
Go deeper
Related to this question
Learn chapter
Installing Linux and Package Management
Key term
Linux
Linux is an open-source operating system that manages computer hardware and software, widely used in servers, desktops, and embedded systems.
Key term
Mount
Mounting is the process of making a file system or storage device accessible to a computer's operating system by attaching it to a specific directory in the existing directory tree.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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