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

问题描述

对于我遇到的所有 Dockerfiles(诚然不多)，它们都使用 FROM 子句来基于现有图像，即使它是 FROM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.

这个条款是必需的吗?是否可以有一个没有 FROM 子句的 Dockerfile?这样创建的容器是否可以做任何事情?

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?

编辑
我读了

没有 FROM 指令的 Dockerfile 没有父镜像，并且被调用基础图像.

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

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

但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设置 Base后续说明的图像.因此，一个有效的 Dockerfile 必须从 FROM 指令开始.图像可以是任何有效的图像——它通过从公共中提取图像特别容易开始存储库.

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/#来自

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