hadsch / helm-share-values-demo

Demostration how to share values between multiple helm Subcharts using the `global` key and using the template syntax as value in the values.yaml file

This is a demonstration how you can share values between multiple helm Subcharts using the global key and using the template syntax as value in the values.yaml file.

Usage

To test the output use this command:

helm install --dry-run demo my-chart

Each Subchart is a standalone chart and can be used separately. To test one Subchart use this command:

  helm install --dry-run demo my-chart/charts/subchart-main

Output

As you can see the values are shared between the Subcharts and the parent chart.

# Source: mychart/charts/subchart-main/templates/subchart-main.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: demo-cfg-subchart-main
data:
  # Important: The values containing the template syntax. Therefore the template function is required to get the defined values in the global section.
  name: my-service-1 SHARED
  endpoint: my-service-1-endpoint SHARED
---
# Source: mychart/charts/subchart01/templates/subchart01-cfg.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: demo-cfg-subchart01
data:
  name: my-service-1 SHARED
  endpoint: my-service-1-endpoint SHARED
---
# Source: mychart/templates/parent.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: demo-cfg-parent
data:
  my-value: my-service-1 SHARED