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What security benefit does enabling user namespace remapping provide in Docker containers?

easy📝 Conceptual Q1 of 15
Docker - Security

What security benefit does enabling user namespace remapping provide in Docker containers?

AIt increases container network speed
BIt isolates container root users from the host root user
CIt allows containers to share the host's user IDs
DIt disables SELinux enforcement inside containers
Step-by-Step Solution
Solution:
  1. Step 1: Understand user namespaces

    User namespaces map container user IDs to different host user IDs.
  2. Step 2: Security implication

    This mapping isolates the container's root user from the host's root, reducing risk if container is compromised.
  3. Final Answer:

    It isolates container root users from the host root user -> Option B
  4. Quick Check:

    Isolation of root privileges enhances security [OK]
Quick Trick: User namespace remapping isolates container root from host root [OK]
Common Mistakes:
  • Confusing user namespace remapping with network namespaces
  • Assuming it improves performance
  • Thinking it disables SELinux

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