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Merge pull request #9282 from SvenDowideit/explain-VIRTUAL-SIZE 

Explain what the VIRTUAL SIZE means
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Sven Dowideit 2014-11-27 12:19:09 +10:00
parent ec07bb48fc 498f208ade
commit ff327f9d57
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docs/sources/reference/commandline/cli.md
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@ -796,6 +796,10 @@ decrease disk usage, and speed up `docker build` by
allowing each step to be cached. These intermediate layers are not shown
by default.
The `VIRTUAL SIZE` is the cumulative space taken up by the image and all
its parent images. This is also the disk space used by the contents of the
Tar file created when you `docker save` an image.
An image will be listed more than once if it has multiple repository names
or tags. This single image (identifiable by its matching `IMAGE ID`)
uses up the `VIRTUAL SIZE` listed only once.