Helm Nested lists within range - kubernetes

Question

I have the following content in values.yaml and deployment.yaml:
values.yaml:
===========
apps:
test-app1:
deploy: true
containerports:
- 8000
- 8081
test-app2:
deploy: true
containerports: 6000
deployment.yaml:
===============
{{- if .Values.apps }}
{{- range $key, $value := .Values.apps }}
{{- if $value.deploy }}
apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ $key }}
spec:
progressDeadlineSeconds: 600
selector:
matchLabels:
app: {{ $key }}
replicas: {{ $.Values.replicas | default 1 }}
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 1
maxUnavailable: 1
template:
metadata:
labels:
app: {{ $key }}
spec:
imagePullSecrets:
- name: secret1
containers:
- image: {{ $.Values.image.repository }}/{{ $key }}:latest
name: {{ $key }}
imagePullPolicy: IfNotPresent
ports:
{{- range .Values.containerports }}
- containerPort: {{ . | title | quote }}
{{- end }}
{{- end }}
{{- end }}
{{- end }}
How do I iterate if I have more than one container port within the range? With the above template, I am getting the error as:
<.Values.containerports>: nil pointer evaluating interface {}.containerports
Any help is highly appreciated.

Answer 1

Change values.yaml so that both containerports are arrays
apps:
test-app1:
deploy: true
containerports:
- 8000
- 8081
test-app2:
deploy: true
containerports:
- 6000
otherwise Helm will throw an error
range can't iterate over 6000
Then change ports block in deployment.yaml to
ports:
{{- range $key, $value := $value.containerports }}
- containerPort: {{ . }}
{{- end }}
You may also want to add a separator between resources, otherwise only one deployment will be created (test-app2 in your case).
The entire deployment.yaml should like like this
{{- if .Values.apps }}
{{- range $key, $value := .Values.apps }}
{{- if $value.deploy }}
apiVersion: apps/v1
kind: Deployment
metadata:
name: {{ $key }}
spec:
progressDeadlineSeconds: 600
selector:
matchLabels:
app: {{ $key }}
replicas: {{ $.Values.replicas | default 1 }}
strategy:
type: RollingUpdate
rollingUpdate:
maxSurge: 1
maxUnavailable: 1
template:
metadata:
labels:
app: {{ $key }}
spec:
containers:
- image: {{ $.Values.image.repository }}/{{ $key }}:latest
name: {{ $key }}
imagePullPolicy: IfNotPresent
ports:
{{- range $key, $value := $value.containerports }}
- containerPort: {{ . }}
{{- end }}
{{- end }}
---
{{- end }}
{{- end }}