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I was handed a Kubernetes cluster with no config files, and was not setup with helm. The author said they just created everything from the cmd line. It is a small/new cluster for a single API server with an nginx ingress controller. I know enough of Kubernetes to get around and was able to add a new web server, but now I need to get in deeper and update existing configs. Specifically, I want to enable prometheus metrics on the nginx controller, but I don't want to break anything.

Is there a standard way to retrieve the existing configurations (deployments, services, etc) from the cluster, make modifications, and apply them? Or is there a way to patch in updates to individual parts of the existing configuration without having to create a new yaml file?

I understand I can get the current config with something like this:

kubectl get services -n nginx -o yaml

That output has additional fields like creationTimestamp, uid, etc, that I suppose I need to remove. Or can I just save the output exactly as is to a yaml file, make my modifications to enable prometheus, and then apply the config back to the controller? Will it ignore the kube-created fields? Is there a different approach I should be considering?

Secondly, should I store these configurations in a repository, or is this just how things are done?

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Seems like you have almost anything you need; there are only some minor considerations:

  • kubectl -n <ns> get <CRD> -o yaml will give you the output with some read-only identificators, which you cannot redefine even if they will keep theis values, so these aren't suited to keep them as plain files.
  • use kubectl edit instead
  • as about should you keep these in any VCS you want, or should you just make modifications on the fly - it's entirely up to you to decide; any attempt to discuss this will probably start a flame.
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  • Thank you very much, exactly what I was missing. I'm okay with taking an approach that 50% consider valid. I'm sure I will come to a conclusion on that myself as I get more insight and experience with Kube. Commented Sep 8, 2023 at 13:04

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