FROM golang:1.12-alpine as builder RUN apk add --no-cache git WORKDIR /go/croc COPY . . RUN go build -v FROM alpine:latest EXPOSE 9009 EXPOSE 9010 EXPOSE 9011 EXPOSE 9012 EXPOSE 9013 COPY --from=builder /go/croc/croc /croc ENTRYPOINT ["/croc"] CMD ["relay"]