Helm how to use variables in values.yaml

Question

In the values.yaml we have the below env values and they are refered by templates/deployment.yaml {{- toYaml .Values.env | nindent 12 }}

env:
  - name: APPLICATION_PORT
    valueFrom:
      configMapKeyRef:
        name: application-properties
        key: application_port
  - name: POSTGRES_AUTH_URL
    valueFrom:
      configMapKeyRef:
        name: application-properties
        key: postgres_business_auth_url
  - name: POSTGRES_DATA_URL
    valueFrom:
      configMapKeyRef:
        name: application-properties
        key: postgres_verification_data_url

Trying to change the above and make a template of the ConfigMap name without any success, by receiving the following error:

cannot load values.yaml: error converting YAML to JSON: yaml: invalid map key: map[interface {}]interface {}{"tpl .Values.myConfigMapName .":interface {}(nil)}

myConfigMapName: application-properties
env:

name: APPLICATION_PORT
valueFrom:
  configMapKeyRef:
    name: {{ tpl .Values.myConfigMapName . }}
    key: application_port
name: POSTGRES_AUTH_URL
valueFrom:
  configMapKeyRef:
    name: {{ tpl .Values.myConfigMapName . }}
    key: postgres_business_auth_url
name: POSTGRES_DATA_URL
valueFrom:
  configMapKeyRef:
    name: {{ tpl .Values.myConfigMapName . }}
    key: postgres_verification_data_url

How can I consume a variable from values.yaml and use it within values.yaml ?

The values file is only values, there's no templating support in that file. But you can run templates against a value in templates where you use the values. — BMitch, Dec 21 '21 at 23:48

score -2 · Answer 1 · answered Dec 23 '21 at 19:52

Try renaming values.yaml to values.yaml.j2 (jinja2) and remove the "tpl", the template should just be as follows.

  configMapKeyRef:
    name: {{ .Values.myConfigMapName }}
    key: application_port

I know that works with bazel builds using the following:

load("//build/helmcharts:helpers.bzl", "release_chart")

Helm how to use variables in values.yaml

1 Answers1