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What is the difference between SizeRootFs and SizeRw in Docker containers?

From the list of docker containers, you can get the container sizes SizeRootFs and SizeRw, but I can not find what the exact values ​​mean.

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SizeRootFsis the total size of all files in the container in bytes. If you exported the container file system as a tarball, that would be about this size.

SizeRw- the size of the files that were created or modified, if you compare the container with its base image. Immediately after creation, this should be zero; when you change (or create) files, it will increase.

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Source: https://habr.com/ru/post/1529881/

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