Dockerfile是否需要`FROM`子句？ [英] Is `FROM` clause required in Dockerfile?

问题描述

对于我遇到过的所有Dockerfile（确实并不多），它们都使用了 FROM 子句来建立现有映像，甚至如果是从头开始。

For all the Dockerfiles I've come across thus (which admittedly is not many), all of them have used a FROM clause to base off an existing image, even if it's FROM scratch.

是否需要此条款？是否有可能没有 FROM 子句的Dockerfile？这样创建的容器可以执行任何操作吗？

Is this clause required? Is it possible to have a Dockerfile with no FROM clause? Will this container created thus be able to do anything?

EDIT

我读过

EDIT
I read

没有FROM指令的Dockerfile没有父映像，被称为
a基本映像。

A Dockerfile with no FROM directive has no parent image, and is called a base image.

https://docs.docker.com/glossary/?term=parent% 20image

但是我认为这可能是一个错误。

But I think this may be an error.

推荐答案

根据官方文档要求：

FROM 指令初始化一个新的构建阶段，并为后续指令设置基本
映像。因此，有效的Dockerfile 必须
以 FROM 指令开头。该图像可以是任何有效图像–从公共
存储库中拉出图像，特别容易启动
。

The FROM instruction initializes a new build stage and sets the Base Image for subsequent instructions. As such, a valid Dockerfile MUST start with a FROM instruction. The image can be any valid image – it is especially easy to start by pulling an image from the Public Repositories.

https://docs.docker.com/engine/reference/builder /＃from

这篇关于Dockerfile是否需要`FROM`子句？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！