VOLUME命令在Dockerfile中做什么？ [英] what does VOLUME command do in Dockerfile?

问题描述

我难以理解VOLUME的其他优点（ https：// docs .docker.com / engine / reference / builder /＃volume ）。

I am having it difficulty in understanding added advantage of VOLUME(https://docs.docker.com/engine/reference/builder/#volume) .

在Dockerfile中，可以使用mkdir创建目录。一旦创建目录，我们就可以处理它。为什么指定VOLUME（装载）并分配给该目录？ VOLUME支架有什么优势？我试图在没有VOLUME的情况下理解我们会错过什么。

In Dockerfile one can have mkdir to create a directory. Once the directory is created we can have handle to it. why specify a VOLUME (mount)and assign to that directory? What advantage VOLUME mount gives? I am trying to understand here without VOLUME what will we miss.

对我来说，它看起来像一个冗余函数，但是我可能错了。

to me its looks like a redundant function , however I might be wrong.

推荐答案

在容器删除后我们不想丢失数据时，卷非常有用。配置文件，数据库数据等。因此，您可以将同一卷与完整的新Docker容器一起使用。如果仅在Dockefile中创建目录，则文件夹内的数据将与容器一起删除。

A volume is very helpful when we don't want to lose data once the container is deleted. A configuration file, a database data, etc. Hence, you are able to use the same volume with a complete new docker container. If you only create a directory within the Dockefile, the data inside the folder will be deleted toghether with the container.

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