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dfang/ENV and ARG

Last active May 8, 2016 16:41
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ENV and ARG
```Dockerfile
FROM busybox
ARG EXPOSED_PORTS
ENV EXPOSED_PORTS ${EXPOSED_PORTS:-20000}
RUN echo ${EXPOSED_PORTS}
EXPOSE ${EXPOSED_PORTS}
```
这种写法也可以不传 --build-arg
docker build -t test .
docker build --build-arg EXPOSED_PORTS="10001 10002" -t test .
关键在于第三行
https://docs.docker.com/engine/reference/builder/#environment-replacement
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