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# **多阶段构建：官方文档怎么把构建工具留在中间层**

Docker 官方文档把 multi-stage builds 定位成：优化镜像体积、同时保持 Dockerfile 可读。核心做法是多个 `FROM`，每个开启新阶段；用 `COPY --from` 只把产物拷到最终阶段，构建工具留在中间层。\[1]

最小例子：一阶段用 `golang` 编译出 `/bin/hello`，二阶段 `FROM scratch`，`COPY --from=build` 只拷二进制。给阶段起名 `AS build`，后续指令重排也不容易拷错层。调试可用 `docker build --target build` 停在中间阶段。\[1]

适合镜像瘦身、CI 产物分离。不是新项目，是官方长期推荐路径；写 Dockerfile 前先读原文示例更稳。

文档： https://docs.docker.com/build/building/multi-stage/

## 来源

> \[1] [Docker Docs Multi-stage builds](https://docs.docker.com/build/building/multi-stage/) 2026-10-24

#Docker #多阶段构建 #Dockerfile #镜像优化 #官方文档

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