Section 2.1.8 forgets to inform readers of all levels that they need to (or in most cases) run `docker login` before any attempt to push the example image to the public registry under the user name they already have or have created following the instructions of this book (`docker tag kubia <username>/kubia`)

Thanks!

I actually fixed this a while ago, but apparently that was after the previous MEAP update. The new update comes out today or tomorrow.