README.md

Helm

In this training, we will use Helm to create and customize an application.

Navigate to the folder 26_helm from CLI, before you get started.

Verify if helm is installed

• Check helm

  helm version

• Ensure autocompletion is installed

  echo 'source <(helm completion bash)' >> ~/.bashrc && bash

[Optional] Install helm

curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3
chmod 700 get_helm.sh
./get_helm.sh

Do a release

• Show all releases

  helm ls

• Release with its default values

  helm install my-release-defaults ./my-chart

• Show all releases

  helm ls

• Show kubernetes resources

  kubectl get all

• Delete a release

  helm delete my-release-defaults

Do a customized release

• Release with a custom values.yaml file

  helm install my-release-custom ./my-chart -f my-values.yaml 

• Show all installed charts

  helm ls

• Show kubernetes resources

  kubectl get all

Upgrade a release

• Change the color in the file my-values.yaml to re-release

  helm upgrade my-release-custom ./my-chart -f my-values.yaml

• Show all releases

  helm ls

• Show kubernetes resources

  kubectl get all

Templating

• Add templating for the deployment in the file ./my-chart/templates/deployment.yaml

  ...
  spec:
  replicas: {{ .Values.replicas }}
  selector:
  ...

Customize your new release

• Add the replicas to the file my-values.yaml.

  color: magenta
  replicas: 3

Release

• Re-release

  helm upgrade my-release-custom ./my-chart -f my-values.yaml

• Show all releases

  helm ls

• Show kubernetes resources

  kubectl get pods

Tips & Tricks

• Render yaml files without deploying them

  helm install my-chart ./my-chart --dry-run > dry.run

• Lint your charts

  helm lint ./my-chart

Cleanup

helm delete my-release-custom

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