Docker 将文件从 dockerfile 复制到主机

Question

这个问题在这里已经有了答案:

How to copy files from dockerfile to host? (6 个回答)

关闭 6 个月前。

我正在编写一个 Dockerfile 来构建一个应用程序。我知道您可以使用

手动将文件复制出容器

docker cp <containerId>:/file/path/within/container /host/path/target

(参见 Copying files from Docker container to host )，但我只想运行

docker build

并让它将我的 Dockerfile 创建的构建工件转储到我的主机文件系统的某个位置。

我可以在 Dockerfile 中使用命令从容器中复制到主机中吗？像 COPY 的反义词？

Answer 1

根据 Docker 文档，添加了 API 版本 1.40

Custom build outputs

满足您的需求:

By default, a local container image is created from the build result. The --output (or -o) flag allows you to override this behavior, and a specify a custom exporter. For example, custom exporters allow you to export the build artifacts as files on the local filesystem instead of a Docker image, which can be useful for generating local binaries, code generation etc.

例如

$ docker build --output type=tar,dest=out.tar .

多阶段Dockerfile

FROM golang AS build-stage
RUN go get -u github.com/LK4D4/vndr

FROM scratch AS export-stage
COPY --from=build-stage /go/bin/vndr /

The --output option exports all files from the target stage. A common pattern for exporting only specific files is to do multi-stage builds and to copy the desired files to a new scratch stage with COPY --from.