Example Rockerfile with multiple FROM instructions, see https://github.com/grammarly/rocker

Dockerfile

# Build stage: will start from google/golang:1.4 and compile app.go
FROM google/golang:1.4
ADD . /src
WORKDIR /src
# Will result in putting app.o to the working directory /src
RUN CGO_ENABLED=0 go build -a -installsuffix cgo -v -o app.o app.go
# Will make app.o available in the following FROM
EXPORT app.o

# Describe "run" image based on "busybox", weights 4.3MB
FROM busybox
# Will import recently built app.o into /bin/app
IMPORT app.o /bin/app
CMD ["/bin/app"]
TAG app:latest