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Explain what the VIRTUAL SIZE means

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Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
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Sven Dowideit 2014-11-21 13:47:03 -08:00 committed by Tibor Vass
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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 allowing each step to be cached. These intermediate layers are not shown
by default. 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 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`) or tags. This single image (identifiable by its matching `IMAGE ID`)
uses up the `VIRTUAL SIZE` listed only once. uses up the `VIRTUAL SIZE` listed only once.