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fix "virtual" explanation for "docker ps -s" (#5273)

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Xinfeng Liu 2017-11-11 01:24:51 +08:00 committed by Misty Stanley-Jones
parent 6b21538aa3
commit 7ec947b877
1 changed files with 5 additions and 3 deletions
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8
engine/userguide/storagedriver/imagesandcontainers.md
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@ -81,7 +81,8 @@ command. Two different columns relate to size.
each container each container
- `virtual size`: the amount of data used for the read-only image data - `virtual size`: the amount of data used for the read-only image data
used by the container. Multiple containers may share some or all read-only used by the container plus the container's writable layer `size`.
Multiple containers may share some or all read-only
image data. Two containers started from the same image share 100% of the image data. Two containers started from the same image share 100% of the
read-only data, while two containers with different images which have layers read-only data, while two containers with different images which have layers
in common share those common layers. Therefore, you can't just total the in common share those common layers. Therefore, you can't just total the
@ -90,8 +91,9 @@ command. Two different columns relate to size.
The total disk space used by all of the running containers on disk is some The total disk space used by all of the running containers on disk is some
combination of each container's `size` and the `virtual size` values. If combination of each container's `size` and the `virtual size` values. If
multiple containers have exactly the same `virtual size`, they are likely multiple containers started from the same exact image, the total size on disk for
started from the same exact image. these containers would be SUM (`size` of containers) plus one container's
(`virtual size`- `size`).
This also does not count the following additional ways a container can take up This also does not count the following additional ways a container can take up
disk space: disk space: