XK0-006 Practice Question: Which command will run a container in detached…

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 --name web -p 8080:80 nginx

  Why this is correct

  The -d flag detaches the container, --name web assigns the required name, and -p 8080:80 maps host port 8080 to container port 80. Specifying nginx as the image completes the command, satisfying every constraint in the stem exactly.

• ✗

  docker exec -d --name web -p 8080:80 nginx

  Why it's wrong here

  docker exec runs a command inside an already-running container and cannot create one, so --name and -p are invalid here. It is tempting because exec is the right tool when you need to launch an additional process, such as a shell or script, inside a container that is already up.

• ✗

  docker start -d --name web -p 8080:80 nginx

  Why it's wrong here

  docker start restarts an existing stopped container and accepts neither --name nor -p, since port mappings and names are fixed at creation. It is tempting because start is correct when you need to bring a previously created container back up without recreating it.

• ✗

  docker run -it --name web -p 8080:80 nginx

  Why it's wrong here

  Runs in interactive mode, not detached.