Build Kit

How Do Docker Image Layers and Build Caching Work?

Each instruction in a Dockerfile produces an immutable, content-addressed image layer, and Docker’s build cache reuses a previously built layer whenever the in…

What is BuildKit, and how does it improve on the classic Docker builder?

BuildKit is Docker’s modern build engine that replaces the legacy sequential builder with a concurrent, dependency-graph-based system, enabling parallel execut…

What causes cache busting in Docker builds, and how do you avoid it?

Cache busting happens when a Dockerfile instruction’s cache key changes unexpectedly — usually because an earlier layer’s content changed, the instruction itse…