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tp2-kubectl.md

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Lab 2 - kubectl run

Goal:

  • create a Pod without a descriptor
  • troubleshoot a Pod's start

Getting started

  • Display the help for the kubectl run command:
kubectl run --help

Start Pod

  • Launch the following command to start a Pod
kubectl run whoami --image=traefik/whoami:v1.10 --port=80

It will:

  • start a whoami Pod
  • from the traefik/whoami:v1.10 image
  • and reference the 80 port
  • Check the Pod start with watch kubectl get po (ctrl+c to exit the watch loop)
  • What can you see?
  • Display more details on the Pod with kubectl describe and get its IP address which you will need later
  • Check that the application is working with the following command:
# We have to enter in a node of the cluster
minikube ssh -- curl <ip-du-pod-whoami>:80/api

Troubleshoot a Pod startup

  • Launch the following command to start a new Pod
kubectl run faulty-whoami --image=traefik/whoami:nil --port=80

It will:

  • start a Pod (we will cover the Pod's detail later)
  • with the name faulty-whoami
  • from the image traefik/whoami:nil
  • and reference the 80 port
  • Check the Pod's startup with watch kubectl get po (ctrl+c to exit the watch loop)
  • Check that the Pod fails to start
  • Display more info on the Pod and check the Events with kubectl describe to determine the error cause
  • Delete this Pod with kubectl delete pod faulty-whoami

Start a Pod shell

  • Launch the following command to start a new Pod
kubectl run training-shell --image=zenika/k8s-training-tools:v5 --command -- sleep infinity

It will:

  • start a training-shell Pod
  • from the image zenika/k8s-training-tools:v5
  • whose main process will be sleep infinity
  • Check the Pod's startup
  • List all created Pods
  • Launch kubectl exec training-shell -- curl -s <ip-du-pod-whoami>:80/api
  • Display the help for kubectl exec

k9s

K9s is a TUI ("Text User Interface") used to browse Kubernetes resources without kubectl commands.

  • Launch k9s to find the created Pod and browse the interface. The keyboard shortcuts are displayed on top of the screen. Use CTRL+C to exit.