I’m having trouble understanding what gets inherited from the parent image. When I use "FROM " in my Dockerfile, what exactly gets copied from the parent? Is it just the variables? Or does the parent actually get run?
My dilemma right now is that I want to make a few changes to an existing image but I can’t do that with an image I pulled from the public repos. Is there any other way to do this?
This is the image I’m using as my parent: https://hub.docker.com/r/jenkinsci/ssh-slave/
All I want is to add a few ADD and RUN lines to this image.