How to add helm charts as dependencies to my chart, but provide them with custom values.yml?-CodePudding

I am currently creating a helm chart for my fullstack application, and I would like to install a nats helm chart to it as a dependency. I know I can add it as a dependency in the Charts.yml file, but how can I provide the nats chart with a Values.yml to overrride the default nats chart values? What I would like is that when I do a helm install for my application, it also installs the nats dependency but with custom values.yml.

chart.yml dependency section

dependencies:
- name: nats
  repository: "https://nats-io.github.io/k8s/helm/charts"
  version: "0.11.0"

Then I run helm dependency upgrade. This creates a .tgz under my subcharts as follows

I would like to override the default values.yml which are present in the nats chart. I tried by adding the following to the parent values.yml but it did not work (as taken from https://docs.nats.io/running-a-nats-service/introduction/running/nats-kubernetes/helm-charts#clustering)

nats:
  cluster:
    enabled: true
    replicas: 5

    tls:
      secret:
        name: nats-server-tls
      ca: "ca.crt"
      cert: "tls.crt"
      key: "tls.key"

Do I need to unpack the chart for it to work?

CodePudding user response：

This is documented in Helm website

Overriding Values from a Parent Chart

so in your top level chart's values.yaml, use construct like this:

mysubchart:  # this is dependent sub-chart
  subchart-value-key: .... # this is key in subchart's values.yaml

UPDATE

In your case

nats:
  cluster:
    enabled: true
    replicas: 5

works if I do helm template ., rendered statefullset seems to reflect values correctly:

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: RELEASE-NAME-nats
  namespace: "default"
  labels:
    helm.sh/chart: nats-0.11.0
    
    app.kubernetes.io/name: nats
    app.kubernetes.io/instance: RELEASE-NAME
    app.kubernetes.io/version: "2.6.5"
    app.kubernetes.io/managed-by: Helm
spec:
  selector:
    matchLabels:
      
      app.kubernetes.io/name: nats
      app.kubernetes.io/instance: RELEASE-NAME
  replicas: 5  # This value has been taken from values.yaml

So what exactly is not working?