| 语法 | FROM ... AS build；后续 FROM 基于运行基础镜像 COPY --from=build |
|---|---|
| 收益 | 运行镜像不含编译器与源码（除需要外） |
| 扩展 | 多阶段还可用于测试阶段与产物提取 |
Go 示例
Go 示例
FROM golang:1.22 AS build
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 go build -o /out/app ./cmd/app
FROM gcr.io/distroless/static-debian12
COPY --from=build /out/app /app
ENTRYPOINT ["/app"]COPY go.mod/go.sum 先行、源码后置：依赖层稳定命中缓存，改代码不必重下依赖。