Chapter 2 kubectl deployment doesn't work on a real cluster about demo HOT 4 CLOSED

PR merged with updated Known Issue in the README.

(Not sure why GitHub labeled the PR as "Closed" instead of "Merged").

Also submitted errata to O'Reilly.

Thank you @dwschulze for catching this!

from demo.

@dwschulze thanks for opening an issue!

Are you by chance running version 1.18 of Kubernetes?

I think the issue you are experiencing could be due to a change in the 1.18 release. The latest release of Kubernetes back when the book was published was 1.10 or 1.11 so this could be a case where Kubernetes has changed something and our example no longer works with newer versions.

After searching docs between 1.17 and 1.18 it looks like kubectl run no longer creates a Deployment:

1.17 docs (https://v1-17.docs.kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#run)
Creates a deployment or job to manage the created container(s).

1.18 docs (https://v1-18.docs.kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#run)
Create and run a particular image in a pod.

Let us know if that lines up with your current version and we'll get an update to the Known Issues section in the demo repo with an updated example.

from demo.

This is the command that is needed on a cluster:

$ sudo kubectl create deployment demo --image=demo

Maybe on a single node too?

from demo.

I'm running 1.18.2. Should probably go into the errata too.

from demo.