Intro to Helm

intro-to-helm.md

Create a ConfigMap with Helm

Create a local chart

• helm create first-chart
• Change into the first-chart directory and look around
• Delete the templates directory

Add a ConfigMap

• (re)Make a templates directory and change into the directory
• Create a configmap.yaml file
• Copy and paste the ConfigMap below:

apiVersion: v1
kind: ConfigMap
metadata:
  name: first-chart-configmap
data:
  port: "8080"

Deploy the ConfigMap via Helm

• helm install .
• See your helm chart with helm ls
• See all ConfigMaps with kubectl get cm
• See your ConfigMap data with kubectl describe cm first-chart-configmap
• Delete the helm chart with helm delete <helm_generated_name_of_chart>

Dynamically Render the Name of the ConfigMap with Helm Templating

• Edit your ConfigMap to generate the name dynamically with a Helm template directive

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  port: "8080"

• helm install .
• See your helm chart with helm ls
• See all configmaps with kubectl get cm
• Delete the helm chart with helm delete <helm_generated_name_of_chart>

Resources:

• Helm: Getting Started with a Chart Template