Docker - Security
What is a frequent cause of permission denied errors when user namespace remapping is enabled in Docker?
What is a frequent cause of permission denied errors when user namespace remapping is enabled in Docker?
medium📝 Troubleshoot Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Understand remapping effect
User namespace remapping changes container root UID to a non-root host UID.Step 2: Permission mismatch
If host files are owned by root, remapped container root may lack permissions.Final Answer:
Host directory ownership does not match remapped UID/GID -> Option AQuick 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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