Helm

Helm

Package manager for Kubernetes

Separation of templates (called chart) and values

Supports install/upgrade/uninstall and upgrade/rollback

Based on go templates and sprig library

Many charts from the community on ArtifactHub

Concepts

Demo: Helm 1/2

Install nginx using a Helm chart:

1. Go To ArtifactHub
2. Search for nginx
3. Select nginx by Bitnami

4. Click on Install

    # Add repository
    helm repo add bitnami https://charts.bitnami.com/bitnami
    # Install chart
    helm install my-nginx bitnami/nginx
   

5. Click on Default values

6. Check release

    helm list
   

Demo: Helm 2/2

Modify release

1. Fix service type to ClusterIP

    helm upgrade my-nginx bitnami/nginx --set service.type=ClusterIP
   

2. Use nginx stable release

    helm upgrade my-nginx bitnami/nginx --reuse-values --set image.tag=1.24.0
   

When setting very few fields, use --set

When settings many fields, use --values:

helm update my-nginx bitnami/nginx --values values.yaml

Custom Helm Chart

Clocks drift - even in VMs

Time drift can cause authentication issues

Helm chart for ntp