什么是< none>存储库和标签？当我使用docker构建时，为什么它们出现？

问题描述

这是在我运行 docker build 之前显示的 docker图像

This is what docker images shows before I run docker build.

$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
myapp               latest              a38da0bd9e0b        6 seconds ago       523.8 MB
golang              onbuild             b4997c557048        10 days ago         517.2 MB

在对 myapp进行一些更改后源代码，我运行 docker build -t myapp。，最后得到名为< none> 。

After I make some changes to the myapp source code, I run docker build -t myapp . and I end up with images named <none>.

$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED                      VIRTUAL SIZE
myapp               latest              a38da0bd9e0b        Less than a second ago ago   523.8 MB
<none>              <none>              e4209f97e819        10 minutes ago               523.8 MB
golang              onbuild             b4997c557048        10 days ago                  517.2 MB

我知道我可以使用 docker rmi< IMAGE ID> 删除它们，但为什么会这样呢？如何防止这种情况发生？

I know I can remove them with docker rmi <IMAGE ID>, but why does that happen in the first place? How can I prevent that from happening? The Dockerfile I'm building looks like this.

FROM golang:onbuild
EXPOSE 8080

推荐答案

如果您重新分配标签或图像名称到另一个图像，您的图像将丢失其标签或名称。真的很简单您的 myapp repo image tagged 最新，ID为$ code> a38da0bd9e0b 在图片ID e4209f97e819 上命名和标记。

If you reassign a tag or image name to another image, your image will lose its tag or name. It's really that simple. Your myapp repo image tagged latest with ID a38da0bd9e0b used to be named and tagged on image ID e4209f97e819.

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