Why does dive show some layers with size but no added files, and what does this imply about Docker image layering?

hard📝 Conceptual Q10 of 15

Docker - Image Optimization

Why does dive show some layers with size but no added files, and what does this imply about Docker image layering?

ABecause layers can modify or delete files without adding new ones, showing Docker layers are cumulative

BBecause dive has a bug and misses files in those layers

CBecause those layers are placeholders and do not affect the image

DBecause Docker compresses layers differently causing size mismatch

Step-by-Step Solution

Solution:

Step 1: Understand Docker layering
Docker layers build on each other; some layers modify or delete files without adding new ones.
Step 2: Interpret dive's layer size display
dive shows size for such layers because they change the image state cumulatively.
Final Answer:
Because layers can modify or delete files without adding new ones, showing Docker layers are cumulative -> Option A
Quick Check:
Layer size with no files means cumulative changes = A [OK]

Quick Trick: Docker layers build cumulatively, not just add files [OK]

Common Mistakes:

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