docker host和node有什么区别？

我知道与SO相似的问题已经被提出。但是，它并没有澄清我在寻找什么。

I know that questions similar to this one is already asked on SO. But, it doesn't make clarification on what I am looking for.

我正试图弄混码头工人。我遇到过术语 docker host 和 docker node 。我指的是这篇文章：- https://docs.docker.com/入门/ part3 /＃docker-composeyml 。

I am trying to get my hands dirty on docker. I have encountered the terminology docker host and docker node. I am referring this article:- https://docs.docker.com/get-started/part3/#docker-composeyml.

我知道docker host是一台运行一个或多个容器并安装了docker引擎的主机。而且，docker主机可以是物理机，也可以是虚拟机。

I know that docker host is the one, which runs one or more containers and in which docker engine is installed. Moreover, docker host can either be a physical machine or it can be a virtual machine.

但是我对docker节点感到困惑。与docker host有何不同？当Docker主机成为Docker节点时？

But I am confused about docker node. How it's different from docker host ? When a docker host becomes docker node ?

感谢您的耐心等待。