Answer
Unreferenced layers become dangling and are removed by docker system prune.
Quick Answer
Build layers that are no longer referenced by any image tag become dangling. Docker's garbage collector (triggered by docker image prune or BuildKit's own GC) identifies layers with no referencing manifests and removes them. BuildKit tracks layer dependencies more precisely than the classic builder and GC's more aggressively.
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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