The Complete Guide to Helm: From Zero to Production Mastery 2/3

Salwan Mohamed

14 min read

·

Aug 27, 2025

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A comprehensive journey through Kubernetes package management for DevOps and Platform Engineers

Advanced Templating and Configuration {#advanced-templating}

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As your Helm skills develop, you’ll need to master advanced templating techniques for complex deployments.

Helper Templates (_helpers.tpl)

Helper templates promote reusability and maintain consistency across your charts:

{{/*
Expand the name of the chart.
*/}}
{{- define "my-web-app.name" -}}
{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
{{- end }}

{{/*
Create a default fully qualified app name.
*/}}
{{- define "my-web-app.fullname" -}}
{{- if .Values.fullnameOverride }}
{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- $name := default .Chart.Name .Values.nameOverride }}
{{- if contains $name .Release.Name }}
{{- .Release.Name | trunc 63 | trimSuffix "-" }}
{{- else }}
{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
{{- end }}
{{- end }}
{{- end }}

{{/*
Common labels
*/}}
{{- define "my-web-app.labels" -}}
helm.sh/chart: {{ include "my-web-app.chart" . }}
{{ include "my-web-app.selectorLabels" . }}
{{- if .Chart.AppVersion }}…