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🚀 Lab 03- Functions Basics

🎯 Objective

Get hands-on experience with Helm's Function capabilities.

estimated time: 10m

In this Tutorial we are going to have a basic look on how function works and what are the benefits of using them.

📚 Instructions

1️⃣ Step1 : Inspect the existing Chart

  1. Cd to Lab03 and open the existing "Video" chart with visual studio code.

  2. We are going to change the file called _helpers.tpl which holds the function definitions.

  3. By using your amazing Reverse Engineering skils , Google , Helm Docs and Co-Pilot , perform the following :

  • on deployment.yaml line 31 add the container security context from the values file.
  • add a function called "video.image" that is concating the ACR name (Values.acr) the image name and the appVersion of the chart e.g "vicorpacr.azurecr.io"/indexing-service:1.16.0"

NOTE: the places to change / add code are marked with +++ADD_CODE_HERE+++

  1. Run the template in Lint Mode to ensure it is not missing values and/or has the right allignments.

Challange:_ What if Some day we would like to support Digest Tags and not Image Tags ?

helm lint video
Solution on the _helpers.tpl function add the following 
  {{/*
  VI Image name
  */}}
  {{- define "Video.image" -}}
  {{- $separator := ":" -}}
  {{- $termination := 1.16 | toString -}}
  {{- if .Values.image.digest }}
      {{- $separator = "@" -}}
      {{- $termination = .Values.image.digest | toString -}}
  {{- end -}}
  {{- printf "%s/%s%s%s" .Values.image.acr .Values.image.repository $separator $termination }}
  {{- end }}

Then , open deployment.yaml and change

  securityContext:
  +++ADD_CODE_HERE+++
  image: +++ADD_CODE_HERE+++

to

  securityContext:
  {{- toYaml .Values.securityContext | nindent 10 }}
  image: {{ include "Video.image" . }}

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