We all know how to writeDockerfileWhen there is only oneFROMInstruction that indicates the parent mirror on which it depends.

I pass nownginxMirror image constructs a mirror image of its own, calledmy-nginx

Then, I can passFROM my-nginxBuild a new image and push it overmy-nginx?

It meansDockerfilehit the targetFROM, canFORMSelf?