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What is a frequent cause of permission denied errors when user namespace remapping is enabled in Docker?

medium📝 Troubleshoot Q6 of 15
Docker - Security

What is a frequent cause of permission denied errors when user namespace remapping is enabled in Docker?

AHost directory ownership does not match remapped UID/GID
BDocker daemon is running as root
CContainer image lacks root user
DSELinux is disabled on the host
Step-by-Step Solution
Solution:
  1. Step 1: Understand remapping effect

    User namespace remapping changes container root UID to a non-root host UID.
  2. Step 2: Permission mismatch

    If host files are owned by root, remapped container root may lack permissions.
  3. Final Answer:

    Host directory ownership does not match remapped UID/GID -> Option A
  4. Quick Check:

    Ownership mismatch causes permission errors [OK]
Quick Trick: Mismatch of host ownership and remapped UID causes permission errors [OK]
Common Mistakes:
  • Blaming Docker daemon user
  • Assuming container image user causes errors
  • Ignoring file system permissions

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