A Composite Dockerfile

Dockerfile

# -------------------------------------------------------
# Build the go source
# -------------------------------------------------------
FROM docker.io/golang:1.11 as go-builder

# copy simple go application into the container
COPY app/api/main.go $GOPATH/src/app/main.go
# change the working directory, for convenience
WORKDIR $GOPATH/src/app
# build the Go binary and create some directories to copy in later stages
RUN CGO_ENABLED=0 go build -o /go/bin/app ./main.go && \
    echo "App built"
    
# -------------------------------------------------------
# Put the go source into the scratch_and_sniff base image
# -------------------------------------------------------
FROM scratch_and_sniff

# copy source files from go-builder stage into the scratch container
COPY --from=go-builder /go/bin/app /usr/bin/app
# change working directory, so CMD is brief
WORKDIR /usr/bin/

# run the Go application
CMD ["app"]