5-multi-stage-prod.dockerfile

FROM golang:1.8.5-jessie as builder
# install dep
RUN go get github.com/golang/dep/cmd/dep
# create a working directory
WORKDIR /go/src/app
# add Gopkg.toml and Gopkg.lock
ADD Gopkg.toml Gopkg.toml
ADD Gopkg.lock Gopkg.lock
# install packages
RUN dep ensure --vendor-only
# add source code
ADD src src
# build the source
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main src/main.go

# use a minimal alpine image
FROM alpine:3.7
# add ca-certificates in case you need them
RUN apk add --no-cache ca-certificates
# set working directory
WORKDIR /root
# copy the binary from builder
COPY --from=builder /go/src/app/main .
# run the binary
CMD ["./main"]