How to use environment/secret variable in Helm? - kubernetes

Question

In my helm chart, I have a few files that need credentials to be inputted
For example
<Resource
name="jdbc/test"
auth="Container"
driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
url="jdbc:sqlserver://{{ .Values.DB.host }}:{{ .Values.DB.port }};selectMethod=direct;DatabaseName={{ .Values.DB.name }};User={{ Values.DB.username }};Password={{ .Values.DB.password }}"
/>
I created a secret
Name: databaseinfo
Data:
username
password
I then create environment variables to retrieve those secrets in my deployment.yaml:
env:
- name: DBPassword
valueFrom:
secretKeyRef:
key: password
name: databaseinfo
- name: DBUser
valueFrom:
secretKeyRef:
key: username
name: databaseinfo
In my values.yaml or this other file, I need to be able to reference to this secret/environment variable. I tried the following but it does not work:
values.yaml
DB:
username: $env.DBUser
password: $env.DBPassword

Answer 1

you can't pass variables from any template to values.yaml with helm. Just from values.yaml to the templates.
The answer you are seeking was posted by mehowthe :
deployment.yaml =
env:
{{- range .Values.env }}
- name: {{ .name }}
value: {{ .value }}
{{- end }}
values.yaml =
env:
- name: "DBUser"
value: ""
- name: "DBPassword"
value: ""
then
helm install chart_name --name release_name --set env.DBUser="FOO" --set env.DBPassword="BAR"