[kubernetes-users] questions regarding Overriding Values from a Parent Chart

[Xuan]

Hi,

I'm new to Kubernetes and Helm chart, and I'm trying to deploy Grafana into 
kubenetes. I created my own parent chart, which includes the default 
grafana helm chart as the subchart. 

the structure is as below:

mygrafana-chart:
 - Chart.yaml
 - charts/
      - grafana-0.8.0.tgz
 - requirements.yaml
 - templates/
      - ingress.yaml
      - persistent-volumes.yaml
      - NOTES.txt
      - _helpers.tpl
 - values.yaml

With the default grafana helm chart as the subchart (
https://github.com/kubernetes/charts/blob/master/stable/grafana), I'm able 
to deploy the grafana with my own ingress and PV yaml files. 

However, since the default values.yaml doesn't have "adminPassword" enabled 
(https://github.com/kubernetes/charts/blob/master/stable/grafana/values.yaml), 
I got a random password for admin every time I redeployed my grafana. 

adminUser: admin
# adminPassword: strongpassword

Now I hope to add "adminPassword" from my own value.yaml, and override this 
into the sub chart. I checked 
https://github.com/kubernetes/helm/blob/master/docs/chart_template_guide/subcharts_and_globals.md#overriding-values-from-a-parent-chart

My requirement.yaml is as following:

dependencies:
  - name: grafana
    version: 0.8.0
    repository: https://kubernetes-charts.storage.googleapis.com

Then I added the following lines into my values.yaml

grafana:
  adminPassword: adminfoobar

When I deployed the updated helm chart, my changes to the adminPassword was 
not applied as I expected. I'm not sure if the zip file under charts/ 
matters. 

The defualt secret.yaml from grafana helm chart is as below:

apiVersion: v1
kind: Secret
metadata:
name: {{ template "grafana.fullname" . }}
labels:
app: {{ template "grafana.name" . }}
chart: {{ template "grafana.chart" . }}
release: {{ .Release.Name }}
heritage: {{ .Release.Service }}
type: Opaque
data:
admin-user: {{ .Values.adminUser | b64enc | quote }}
{{- if .Values.adminPassword }}
admin-password: {{ .Values.adminPassword | b64enc | quote }}
{{- else }}
admin-password: {{ randAlphaNum 40 | b64enc | quote }}
{{- end }}


So it seems like the "adminPassword" added to my own values.yaml was not 
overriding to the subchart's values.yaml, so the secret.yaml still takes 
the random characters. 

Any suggestions or help are appreciated!

Thanks,

- Xuan


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