docker - 为什么多阶段 docker build 卡在“COPY --from=builder ...”

Question

上下文如下：

• 詹金斯
• Kubernetes 插件
• Docker-in-Docker/dind 容器
• 多阶段 Dockerfile

流程如下所示：

1. 拉建设者docker pull repo/image:builder
2. 构建构建器DOCKER_BUILDKIT=1 docker build . --build-arg BUILDKIT_INLINE_CACHE=1 --target builder --cache-from repo/image:builder --tag repo/image:builder
3. 推送生成器docker push repo/image:builder
4. 拉图像docker pull repo/image:tag
5. 构建镜像DOCKER_BUILDKIT=1 docker build . --build-arg BUILDKIT_INLINE_CACHE=1 --cache-from repo/image:builder --cache-from repo/image:tag --tag repo/image:tag
6. 推送图片docker push repo/image:tag

Dockerfile：

FROM node:8.16.0 as builder

WORKDIR /app
RUN mkdir /app/frontend
COPY frontend/package.json /app/frontend/
WORKDIR /app/frontend
RUN npm install
COPY frontend /app/frontend
RUN npm run build
FROM nginx:1.13.8-alpine
WORKDIR /project/web
COPY --from=builder --chown=nginx:nginx /app/frontend/built /project/web/public

在COPY --from=builder --chown=nginx:nginx /app/frontend/built /project/web/publicdocker build 永远卡住（30-40 分钟后我手动停止它）没有错误。

编辑：在第一次运行时，当注册表中还没有图像时，构建器缓存并按COPY --from=builder预期工作。只有从第二个版本开始，它才会卡在COPY --from=builder