Answer
OverlayFS merges read-only image layers with a writable upper layer, reducing duplication and speeding up container creation.
Quick Answer
OverlayFS is a union filesystem that stacks layers on top of each other — perfect for Docker's layered image model. The lower directory (image layers) is read-only; the upper directory (container layer) is writable. Reads check upper first, then lower. OverlayFS is fast, well-supported in the Linux kernel, and Docker's default storage driver on most systems.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
Want to bookmark, take notes, or join discussions?
Sign in to access all features and personalize your learning experience.
Source: SugharaIQ