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Clarify statement about compressed layer storage in containerd image store #24476

@mike-sul

Description

@mike-sul

Is this a docs issue?

  • My issue is about the documentation content or website

Type of issue

Information is incorrect

Description

On this page:
https://docs.docker.com/engine/storage/containerd/

there is the statement: “each image stores its own compressed version of shared layers”.

This seems misleading. containerd stores compressed layers in a content-addressable store and deduplicates them by digest, so identical blobs are only stored once and shared across images.

Increased disk usage can still occur when similar layers have different digests (e.g., due to rebuilds or recompression), but this is different from each image storing its own copy.

Could this wording be clarified?

Thanks!

Location

https://docs.docker.com/engine/storage/containerd/#disk-space-usage

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