How does Docker handle image layer deduplication and what are the implications for storage efficiency?

Question

Docker Fundamentals — Hard

How does Docker handle image layer deduplication and what are the implications for storage efficiency?

Accepted Answer

Docker's image layer deduplication is achieved through content-addressable storage, where each layer is identified by a unique SHA256 hash. This means that identical layers shared between images are only stored once on disk, leading to efficient storage utilization.