• Helm: Include definitions on templates

    2 min read

    helm template include define

    Sometimes we might need to add the same content twice on the same Helm chart. A tipical example would be the labels on the Pods that need to match the selectos on the Service. For this when you create a helm chart there are already some default definitions, for example:

    {{/*
Common labels
*/}}
{{- define "pet2cattle.labels" -}}
helm.sh/chart: {{ include "pet2cattle.chart" . }}
{{ include "pet2cattle.selectorLabels" . }}
app.kubernetes.io/managed-by: {{ .Release.Service }}
{{- end }}

{{/*
Selector labels
*/}}
{{- define "pet2cattle.selectorLabels" -}}
app.kubernetes.io/name: {{ include "pet2cattle.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end }}

    16/11/2021

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From pet to cattle
Treat your kubernetes clusters like cattle, not pets