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What is the effect of running docker system prune without any flags?

easy📝 Conceptual Q1 of 15
Docker - Resource Management
What is the effect of running docker system prune without any flags?
AIt deletes all containers, images, volumes, and networks regardless of usage
BIt removes all stopped containers, unused networks, dangling images, but keeps volumes
CIt only removes unused volumes and networks
DIt cleans up only running containers and active images
Step-by-Step Solution
Solution:

  1. Step 1: Understand default prune behavior

    By default, docker system prune removes stopped containers, unused networks, and dangling images but does not remove volumes.

  2. Step 2: Verify volumes are preserved

    Volumes are preserved unless the --volumes flag is explicitly used.

  3. Final Answer:

    It removes all stopped containers, unused networks, dangling images, but keeps volumes -> Option B

  4. Quick Check:

    Default prune excludes volumes [OK]
Quick Trick: Default prune excludes volumes unless --volumes is used [OK]
Common Mistakes:
  • Assuming volumes are removed by default
  • Thinking running containers are removed
  • Believing all images are removed, not just dangling

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