Q1. Which Docker command lists running containers?
- A.docker ps✓ Correct
- B.docker ls
- C.docker containers
- D.docker list
Explanation: docker ps shows active containers (add -a for all). Learn more.
CompTIA Linux+ Practice Questions: Containers
9 free, exam-style CompTIA Linux+ (XK0-006) practice questions covering Containers, each with the correct answer and an explanation. Start a timed exam below, or scroll on to read through the questions.
Containers practice questions
Answers and explanations are shown. Take the timed exam above to test yourself first.
Q2. What does 'podman pull' do?
- A.Start a container
- B.Download an image✓ Correct
- C.Build an image
- D.List containers
Explanation: pull fetches container images from registries. Learn more.
Q3. What does 'podman generate systemd' do?
- A.Create container images
- B.Generate systemd unit files for containers✓ Correct
- C.Update Podman service
- D.Check container health
Explanation: Creates systemd units to manage containers as services. Learn more.
Q4. What does 'podman build -t myimage .' do?
- A.Create container from existing image
- B.Build image from Dockerfile✓ Correct
- C.Tag running container
- D.Push image to registry
Explanation: Builds container image using current directory's Dockerfile. Learn more.
Q5. Which container command lists running Docker containers?
- A.docker ps✓ Correct
- B.docker buildx prune
- C.docker login --help
- D.docker volume create only
Explanation: docker ps lists currently running containers by default. Learn more.
Q6. Which container concept stores persistent data outside a container lifecycle?
- A.Volume✓ Correct
- B.Image tag only
- C.Namespace only
- D.Process ID
Explanation: Container volumes persist data independently of a specific running container instance. Learn more.
Q7. Which Linux kernel feature enforces CPU and memory resource limits for groups of container processes?
- A.Control groups✓ Correct
- B.File capabilities
- C.Symbolic links
- D.PAM stacks
Explanation: Control groups, or cgroups, account for and limit resources such as CPU time, memory, and I/O for process groups. Learn more.
Q8. What is the primary security benefit of running a container in rootless mode?
- A.The image cannot contain any packages
- B.The container engine does not require host root privileges✓ Correct
- C.Networking is automatically disabled
- D.The container becomes a virtual machine
Explanation: Rootless containers run the engine and container processes without host root privileges, reducing the impact of a container escape or engine flaw. Learn more.
Q9. Which command displays the detailed runtime configuration and metadata of a Podman container?
- A.podman diff --metadata
- B.podman build --show
- C.podman inspect CONTAINER✓ Correct
- D.podman system migrate --print
Explanation: podman inspect returns structured details such as image, environment, mounts, network settings, and current state for a container. Learn more.
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