Answer
Layer digests depend on metadata like timestamps and file order; differing metadata prevents sharing.
Quick Answer
Two images with identical layers (same files) would ideally share those layers. But if they were built separately with different build contexts or slightly different ordering, even identical-content layers get different SHA256 hashes due to metadata differences in the layer tar archive. Docker can only share layers with bit-for-bit identical tarballs.
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.
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Source: SugharaIQ