Helm_cheatsheet_functions.md

Helm functions and examples

Note: the vaules.yaml for this is at https://github.com/DeekshithSN/Helm_charts/blob/master/Tem_functions/values.yaml

1. quote

wraps with double quotes to given string, if you give pizza as input the output will be "pizza"

usage:

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  myvalue: "Hello World"
  drink: {{ quote .Values.favorite.drink }}
  food: {{ quote .Values.favorite.food }}

output:

apiVersion: v1
kind: ConfigMap
metadata:
  name: trendsetting-p-configmap
data:
  myvalue: "Hello World"
  drink: "coffee"
  food: "Pizza"

2. repeat

The repeat function will echo the given string the given number of times

usage:

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  myvalue: "Hello World"
  drink: {{ .Values.favorite.drink | repeat 5 | quote }}

output:

apiVersion: v1
kind: ConfigMap
metadata:
  name: melting-porcup-configmap
data:
  myvalue: "Hello World"
  drink: "coffeecoffeecoffeecoffeecoffee"

3. upper

converts given string to uppercase

usage:

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  myvalue: "Hello World"
  drink: {{ .Values.favorite.drink | quote }}
  food: {{ .Values.favorite.food | upper | quote }}

output:

  apiVersion: v1
  kind: ConfigMap
  metadata:
    name: trendsetting-p-configmap
  data:
    myvalue: "Hello World"
    drink: "coffee"
    food: "PIZZA"

4. lower

converts given string to lowercase

usage:

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  myvalue: "Hello World"
  drink: {{ .Values.favorite.drink | quote }}
  food: {{ .Values.favorite.food | lower | quote }}

output:

apiVersion: v1
kind: ConfigMap
metadata:
  name: trendsetting-p-configmap
data:
  myvalue: "Hello World"
  drink: "coffee"
  food: "pizza"

include

The include function allows you to bring in another template, and then pass the results to other template functions.

For example, this template snippet includes a template called mytpl, then lowercases the result, then wraps that in double quotes.

value: {{ include "mytpl" . | lower | quote }}