Change parameter values while implementing helm chart

Question

I am trying to implement helm chart. I need to pass value via CLI to values.yaml file. 

values.yaml

  internalPort: 8081
volumeMounts:
  name: ebs-pvc
ingress:# Default values for miqp-ui-dep.
# This is a YAML-formatted file.
# Declare variables to be passed into your templates.
##################Names of files and Applications################
Depname: miqp-server-dep
Appname: miqp-server
Svcname: miqp-server-svc
Ingname: miqp-ing
#################################################################
replicaCount: 2
strategy:
  type: RollingUpdate
  rollingUpdate:
     maxSurge: 1
     maxUnavailable: 1
minReadySeconds: 5
nodeSelector:
       role: nginxplus
image:
  repository: xxxxxxxxx.dkr.ecr.us-east-1.amazonaws.com/miqp-devops
  tag: miqpserver_2sep
  pullPolicy: IfNotPresent
service:
  name: miqp-ui-svc
  externalPort: 80
  enabled: true
  hosts:
    - kubernetes-miq.xxxxxx.com
  tls:
    - secretName: default-token-k33w6
      hosts:
        - kubernetes-xxxxxx.com
persistence:
  enabled: true
  volume:
    accessModes: ReadWriteOnce
    pvcName: ebs-pvc
    storageClass: standard
    storageSize: 20G

ingress.yaml

{{- if .Values.ingress.enabled -}}
{{- $serviceName := .Values.service.name -}}
{{- $servicePort := .Values.service.externalPort -}}
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: {{ .Values.Ingname }}
  namespace: {{ .Release.Namespace }}
spec:
  rules:
    {{- range $host := .Values.ingress.hosts }}
    - host: {{ $host }}
      http:
        paths:
          - path:
            backend:
              serviceName: {{ $serviceName }}
              servicePort: {{ $servicePort }}
          - path: /api/
            backend:
              serviceName: {{ $serviceName }}
              servicePort: {{ $servicePort }}
     {{- end -}}
  {{- if .Values.ingress.tls}}
  tls:
{{ toYaml .Values.ingress.tls | indent 4 }}
  {{- end -}}
{{- end -}}

How do I replace parameter values in the bellow example?

ingress:
  enabled: true
  hosts:
    - kubernetes-miq.xxxxxx.com
  tls:
    - secretName: default-token-k33w6
      hosts:
        - kubernetes-miq.xxxxxx.com

For example, I need to replace the value of the parameters sectretName and hosts.

How do I do it?

Answer 1

You can use

helm upgrade --reuse-values --set ingress.enabled=false

or for more complex ones

helm upgrade --reuse-values -f <filename>

set via –set in more complex structures

--set key={a,b,c}

Or

--set name.key1=a,name.key2=b

I hope this helps..

Comments

Is there any provision in helm to provide the above values without using --set?

Say, I want to use --set release-namespace={.Values.releaseNamespace} to be picked up dynamically but without use of using --set.

Please let me know.

Thanks in advance.

---

Hey @Tushar, you can add a release directly in your yaml file instead of using -set flag.

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
  namespace: {{ .Release.Namespace }}
data:
  myvalue: "Hello World"

---

Hi @Ashok, I got it resolved the same way only.

Thanks for the comment though :)

---

No problem @Tushar! :)

May I ask what are you trying to do(what project you're working on)?

Answer 2

Array Indexing is available for helm. You can do something like this:

autoscalingGroups:
  - name: my-asg-name
    maxSize: 50
    minSize: 2

Answer 3

Array values can be specified using curly braces: --set foo={a,b,c}. This will translate to the YAML:

foo:
  - a
  - b
  - c

Answer 4

The array indexing is available but only after version 2.5. Make sure you upgrade your helm.

Answer 5

I think when you have complicated modifications, it's better to put these in a file instead of using --set.