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Call out FROM can take a previous stage (#9566) 

The included example could be improved with a more concrete use case, but illustrates the capability as is.
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Jeff Anderson 2019-12-09 05:48:45 -05:00 committed by Usha Mandya
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develop/develop-images/multistage-build.md
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@ -181,3 +181,19 @@ if necessary and copies the artifact from there. The syntax is:
COPY --from=nginx:latest /etc/nginx/nginx.conf /nginx.conf
```
## Use a previous stage as a new stage
You can pick up where a previous stage left off by referring to it when using the `FROM` directive. For example:
```Dockerfile
FROM alpine:latest as builder
RUN apk --no-cache add build-base
FROM builder as build1
COPY source1.cpp source.cpp
RUN g++ -o /binary source.cpp
FROM builder as build2
COPY source2.cpp source.cpp
RUN g++ -o /binary source.cpp
```