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Add note about --entrypoint overriding default command

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

Aanand Prasad authored on 2016/07/26 01:21:23
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@@ -1305,6 +1305,9 @@ or two examples of how to pass more parameters to that ENTRYPOINT:
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     $ docker run -it --entrypoint /bin/bash example/redis -c ls -l
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     $ docker run -it --entrypoint /usr/bin/redis-cli example/redis --help
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+> **Note**: Passing `--entrypoint` will clear out any default command set on the
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+> image (i.e. any `CMD` instruction in the Dockerfile used to build it).
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 ### EXPOSE (incoming ports)
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 The following `run` command options work with container networking: