Dockerfile example of a small (<5mb) statically built go binary

Dockerfile

FROM golang:1.9-alpine3.6 as builder
MAINTAINER Johan Bergström <foo@bar.com>
COPY . /go/src/github.com/jbergstroem/secret-repo
RUN \
  echo "@edge http://dl-cdn.alpinelinux.org/alpine/edge/community" \
       >> /etc/apk/repositories && \
  apk update && \
  apk add git glide upx@edge && \
  cd /go/src/github.com/jbergstroem/secret-repo && \
  glide install && \
  go build release -ldflags '-d' -tags 'release netgo' -installsuffix netgo \
           -a -o secret-binary . && \
  upx --coff --brute --no-progress secret-binary

# copy results into new image
FROM scratch
MAINTAINER Johan Bergström <foo@bar.com>
COPY --from=builder /go/src/github.com/jbergstroem/secret-repo/secret-binary /
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY config.yaml /
EXPOSE 3000
ENTRYPOINT ["/secret-binary"]
CMD ["start"]