Docker Multi-Stage Builds — Yusheng

Multi-stage builds let you use multiple FROM statements in your Dockerfile, copying artifacts from one stage to another.

FROM golang:1.22 AS builder
WORKDIR /app
COPY . .
RUN go build -o server

FROM alpine:3.19
COPY --from=builder /app/server /server
CMD ["/server"]

The resulting image is under 10MB compared to 900MB+ for the builder stage.