Helm Example Repository

• Helm repository for example charts

Prerequisites

• Locally or cluster you fully control (=== configure control plane), where you can
  • Run some docker daemon
    • Docker desktop
  • Install some local cluster
    • tool
      • minikube
      • kind
  • Run a local cluster
    • [minikube] minikube start
    • [kind] kind create cluster

How to run it?

• Add this repository to Helm
  • helm repo add examples https://helm.github.io/examples
    • You are installing the helm chart existing in that repository NOT the helm chart under this current repo!!!
    • TODO: Why does that URL is valid? Which criteria are necessaries? WHy not 'https://github.com/dancer1325/helm-examples'
• Install it
  • helm install ahoy examples/hello-world
    • 'NOTES.txt' is the output
    • kubectl get all to check all the packaged resources have been installed

How to uninstall?

• helm uninstall ahoy

Release

• helm install hi hello-world & helm install hii hello-world
  • helm list to check all the releases installed
  • helm status hii to check the status of the release

Helm config

• Execute the commands of 'Release'
• kubectl get secrets to check the Kubernetes Secrets created each time a release exists
• kubectl get secret/SecretName -o json to check the data with key 'release'

Release Number

• helm upgrade hii hello-world
  • helm list to check that a new release number has been created

helm rollback

• helm install simple simple
  • helm list & kubectl get pods to check that the name of the pod is 'simple-1'
• helm upgrade --set name=simple-2 simple simple
  • helm list to check that a new release of chart has been created
  • kubectl get pods to check that the name of the pod is 'simple-2'
• helm rollback
  • helm list to check that a new release has been created
  • kubectl get pods to check that the name of the pod is 'simple-1' again

Chart Repository / Repo

• helm repo list to list chart repositories

Values

• helm install simple simple
  • kubectl get pods to check that podName is 'simple' -> 'Values.yaml' used by default
• ways to pass customized values
  • -f otherValue.yaml
    • helm upgrade -f simple/customValues.yaml simple simple & kubectl get all to check that podName is now 'simple-custom'
    • helm uninstall simple & helm install -f simple/customValues.yaml simple simple & kubectl get all to check that podName is now 'simple-custom'
  • --set key=vale
    • helm upgrade --set name=simple-upgrade simple simple & kubectl get all to check that podName is now 'simple-upgrade'