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README.md

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simple_k8s

  • A simple k8s configuration that uses Pod and Service/NodePort
  • Single container/pod

Initial Config

This demonstrate that only a limited set of fields can be updated in a Pod config

Pod

A pod with an image from Docker Hub

  • client-pod.yaml

Service/NodePort

A NodePort service that config the external port for local computer

  • client-node-port.yaml

You can expect to see the following error message if you change the containerPort in the Pod config file.

The Pod "client-pod" is invalid: spec: Forbidden: pod updates may not change fields other than spec.containers[*].image, spec.initContainers[*].image, spec.activeDeadlineSeconds or spec.tolerations (only additions to existing tolerations)

Production Config

We then use deployment to provides declarative updates for Pods

Deployment

A deployment to run a set of identical pods (with an image from Docker Hub)

  • client-deployment.yaml