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Added value format description for VOLUME instruction

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In the documentation was not mentioned explicitly that VOLUME value
shoud be a valid JSON array. Because of this I spent time to discovering
the problem with my image where I put `VOLUME ['/data']` (with single quotes).
The `['/data']` mount point was parsed and mounted whole as a string without
any errors and warnings.

Docker-DCO-1.1-Signed-off-by: Max Shytikov <mshytikov@gmail.com> (github: mshytikov)
This commit is contained in:
Max Shytikov
2014-05-09 14:42:27 +02:00
committed by Tibor Vass
parent 1af0c1584d
commit 44841e361a
1 changed files with 3 additions and 2 deletions
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5
docs/sources/reference/builder.md
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@@ -325,8 +325,9 @@ optional but default, you could use a CMD:
The `VOLUME` instruction will create a mount point with the specified name
and mark it as holding externally mounted volumes from native host or other
containers. For more information/examples and mounting instructions via docker
client, refer to [*Share Directories via Volumes*](
containers. The value can be a JSON array, `VOLUME ["/var/log/"]`, or a plain
string, `VOLUME /var/log`. For more information/examples and mounting
instructions via the Docker client, refer to [*Share Directories via Volumes*](
/use/working_with_volumes/#volume-def) documentation.
## USER