K
Q

Helm umbrella chart with mutual exclusive subcharts managed with a single flag

1/14/2020

I'm using helm 2.16. I have a chart with this structure:

umbrella
  |-charts
      |-subchart1
      |-subchart2

I want to be able to install umbrella chart + subchart1 or umbrella chart + subchart2 by using a single flag (subchart1 or subchart2) and have a default for that flag as subchart1.

As helm chart conditions on requirements cannot be negated, are there any other solutions available other that guarding all the resources from one of the charts with IFs ?

-- Laurentiu Soica
kubernetes
kubernetes-helm

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1 Answer

1/16/2020

A workaround that I have found is to place all the subcharts into a subchart folder and have the requirements.yaml configuration file similar to below:

dependencies:
  - name: subchart1
    version: example-version
    repository: "subchart1-directory"
    alias: postgresql
    condition: subchart1.enabled
  - name: subchart2
    version: example-version
    repository: "file://subcharts/subchart2"
    condition: subchart2.enabled

and in values.yaml, add

subchart1:
  enabled: true    
subchart2:
  enabled: false

Then during installation, pass the values to enabled or disable the subchart1 as follows:

$ helm install --set subchart1.enabled=true

or

$ helm install --set subchart1.enabled=false

Take a look here: helm-charts-management, helm-chart-dependences.

-- MaggieO
Source: StackOverflow