Templates

The templates are resource manifests that use the Go templating syntax. Variables defined in the values file, for example, get injected in the template when a release is created. In the MariaDB example we provided, the database passwords are stored in a Kubernetes secret, and the database configuration is stored in a Kubernetes ConfigMap.

We can see that a set of labels are defined in the Secret metadata using the Chart name, Release name, etc. The actual values of the passwords are read from the values.yaml file.

apiVersion: v1
kind: Secret
metadata:
    name: {{ template "fullname" . }}
    labels:
        app: {{ template "fullname" . }}
        chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
        release: "{{ .Release.Name }}"
        heritage: "{{ .Release.Service }}"
type: Opaque
data:
    mariadb-root-password: {{ default "" .Values.mariadbRootPassword | b64enc | quote }}
    mariadb-password: {{ default "" .Values.mariadbPassword | b64enc | quote }}