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Image Layers and Caching

How Docker builds and caches layers efficiently

1 min read | Docker & Containers
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How Docker Builds Images

Docker builds images in layers. Each instruction in a Dockerfile creates a new layer. Docker caches layers — if nothing changes, it reuses the cached version instead of rebuilding.

Layer Caching

Optimizing Layers

Inspecting Layers

🧪 Quick Quiz

What is a Docker image layer?

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