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Docker env

Code examples

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docker ARG 

$ docker build --build-arg some_variable_name=a_value
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dockerfile env 

ENV abc=hello
ENV abc=bye def=$abc
ENV ghi=$abc
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docker expose port 

docker run -p [external]:[Internal]

#example (will open in localhost:8080 to container port 80)
docker run -p 8080:80
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dockerfile env variabes 

FROM busybox
ENV foo /bar
WORKDIR ${foo}   # WORKDIR /bar
ADD . $foo       # ADD . /bar
COPY \$foo /quux # COPY $foo /quux

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