docker - 为什么我的 Docker 容器的可写层在容器退出后仍然存在？

Question

Docker 的 storage overview文档说:

• The data doesn’t persist when that container is no longer running, and it can be difficult to get the data out of the container if another process needs it.
• A container’s writable layer is tightly coupled to the host machine where the container is running. You can’t easily move the data somewhere else.
• Writing into a container’s writable layer requires a storage driver to manage the filesystem. The storage driver provides a union filesystem, using the Linux kernel. This extra abstraction reduces performance as compared to using data volumes, which write directly to the host filesystem.

如您所见，文档说，“当该容器不再运行时，数据不会持久存在”。那么为什么当我停止我的容器时数据没有被删除？

Answer 1

如您所见和评论所证实的那样，数据确实保留在已停止的容器中。您可以重新启动容器并查看容器特定文件系统中的数据。您还可以使用 docker cp 从容器中提取这些文件。我已经提交了以下 documentation PR更新文档并消除任何混淆(感谢您指出措辞)。