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Documenting ENTRYPOINT can empty value of CMD 

Signed-off-by: Brandon Mitchell <git@bmitch.net>
(cherry picked from commit cc316fde55)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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Brandon Mitchell 2018-11-17 10:10:15 -05:00 committed by Sebastiaan van Stijn
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docs/reference/builder.md
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@ -1339,6 +1339,10 @@ The table below shows what command is executed for different `ENTRYPOINT` / `CMD
| **CMD ["p1_cmd", "p2_cmd"]** | p1_cmd p2_cmd | /bin/sh -c exec_entry p1_entry | exec_entry p1_entry p1_cmd p2_cmd |
| **CMD exec_cmd p1_cmd** | /bin/sh -c exec_cmd p1_cmd | /bin/sh -c exec_entry p1_entry | exec_entry p1_entry /bin/sh -c exec_cmd p1_cmd |
> **Note**: If `CMD` is defined from the base image, setting `ENTRYPOINT` will
> reset `CMD` to an empty value. In this scenario, `CMD` must be defined in the
> current image to have a value.
## VOLUME
VOLUME ["/data"]