Example of multi-stage build Dockerfile, introduced in docker v17.05.0

Dockerfile

# Requires docker >= v17.05.0-ce-rc1
# See http://blog.alexellis.io/mutli-stage-docker-builds/
# Usage: 
# > docker build -t syseng-exporter .

FROM golang:1.8 AS go-builder
WORKDIR /go/src/syseng_exporter
COPY *.go ./
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o syseng_exporter .

FROM alpine:3.3
RUN apk --no-cache add ca-certificates
COPY --from=go-builder /go/src/syseng_exporter/syseng_exporter /
CMD ["/syseng_exporter"]