Docker - Security
You want to run a container with user namespace remapping but need the container's root user to have access to a host directory /data. What is the best way to configure this?
You want to run a container with user namespace remapping but need the container's root user to have access to a host directory /data. What is the best way to configure this?
hard📝 Best Practice Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand user namespace remapping effect on file access
With remapping, container root maps to a high UID on host, so host files must be owned or accessible by that UID.Step 2: Adjust host directory ownership
Changing/dataownership to the remapped UID range allows container root to access it safely without disabling remapping.Final Answer:
Change ownership of/dataon host to the remapped UID range -> Option AQuick Check:
Host directory ownership matches remapped UID for access [OK]
Quick Trick: Match host directory ownership to remapped UID [OK]
Common Mistakes:
- Disabling remapping loses security benefits
- Running as non-root may not solve access needs
- Mounting read-only prevents write access
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