使用WSL 2引擎运行docker桌面时使用的docker-desktop-data发行版是什么 [英] What is the docker-desktop-data distro used for when running docker desktop with the WSL 2 engine
问题描述
在具有Hyper-V的Windows上运行docker桌面时，我有一个名为DockerDesktopVM的VM，我的Linux VM在其中运行其容器的情况下运行.
When running docker desktop on Windows with Hyper-V I have a single VM called DockerDesktopVM where my Linux VM is running with it's containers inside.
但是，当我使用WSL引擎运行docker桌面时，我看到它创建了2个WSL发行版.
However when I run docker desktop with the WSL engine I see that it creates 2 WSL distros.
- docker-desktop
- docker-desktop-data
我可以像其他任何发行版一样装入docker-desktop发行版.
I can shell into the docker-desktop distro like I would any other distro.
但是尝试对docker-desktop-data做同样的事情只会让我反感.
But trying to do the same to docker-desktop-data just bounces me out.
所以我的问题是docker-desktop-data发行版有什么用途，为什么它与docker-desktop发行版分开存在?显然，该名称暗含数据，但是什么是特定数据?为什么我不能像其他任何人一样跳入发行版?
So my question is what is the docker-desktop-data distro for and why does it exist separately from the docker-desktop distro? Clearly the name implies data but what specific data and why can't I jump into the distro as I would any other?
推荐答案
docker-desktop-data发行版由docker-desktop发行版用作容器映像等的后备存储.当docker在Hyper-V下运行时，通过在Hyper-V映像中安装VHD可以达到相同的结果，但WSL2则无法实现.
The docker-desktop-data distro is used by the docker-desktop distro as the backing store for container images etc. When docker is run under Hyper-V the same result is achieved by mounting a VHD in the Hyper-V image but this isn't possible with WSL2.
这将为您创建2个WSL发行版:
This will create 2 WSL distros for you:
Docker-desktop, which I’ll call the bootstrapping distro
Docker-desktop-data, which I’ll call the data store distro
从高层的角度来看，引导发行版本质上是取代了Hyper-V，而数据存储发行版取代了我们以前已附加到VM.
From a high level perspective, the bootstrapping distro essentially replaces Hyper-V, while the data store distro replaces the VHD that we previously attached to the VM.
引导发行版使用其自己的根目录创建一个Linux名称空间基于我们前面提到的相同2个iso文件的文件系统(不是完全正确，但足够接近)，并使用数据存储发行版作为容器映像等的后备存储，而不是VHD(WSL 2可以目前不允许我们附加其他VHD，因此我们可以利用跨发行版).
The bootstrapping distro creates a Linux namespace with its own root filesystem based on the same 2 iso files we mentioned earlier (not entirely true, but close enough), and use the data-store distro as the backing store for container images etc. instead of a VHD (WSL 2 does not allow us to attach additional VHD at the moment, so we leverage cross-distro mounts for that).
博客文章很好地介绍了wsl上的docker的工作原理.
The blog post is a great introduction to how docker on wsl works.
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