Demo Deploy Apps using HELM Chart

In this lesson you’ll learn how to deploy Helm charts with Argo CD and how Argo CD exposes Helm-specific options: value files, inline values, valuesObject, and Helm parameters. The examples use a simple Helm chart that renders a ConfigMap and a Deployment from chart defaults in values.yaml. You’ll also see how Argo CD merges and applies overrides and the defined order of precedence.

Argo CD Application spec (Helm)

A typical Argo CD Application that references a Helm chart includes Helm-specific fields under spec.source.helm. The minimal Application spec looks like this:

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: guestbook
  # You'll usually want to add your resources to the argocd namespace.
  namespace: argocd
  # Add this finalizer ONLY if you want these to cascade delete.
  finalizers:
    # The default behaviour is foreground cascading deletion
    - resources-finalizer.argocd.argoproj.io
  labels:
    name: guestbook
spec:
  # The project the application belongs to.
  project: default

  # Source of the application manifests
  source:
    repoURL: https://github.com/argoproj/argocd-example-apps.git
    targetRevision: HEAD    # If repoURL is a Git repo, this is branch/tag/commit. If repoURL is a Helm repo, this can be the chart version.
    path: guestbook         # Path inside the repo when using a Git source

Scroll to spec.source.helm to configure Helm-specific behavior. Argo CD accepts multiple ways to pass Helm values and options:

valueFiles: list of values files (relative to spec.source.path)
values: inline YAML block
valuesObject: native key/value map (preferred over values)
parameters: Helm name/value list (highest precedence)

Below are common Helm source options you’ll use.

Example: valueFiles / values / valuesObject

Use valueFiles to reference files in the chart directory (relative to spec.source.path). You can also provide values as an inline YAML document or valuesObject as a native map. valuesObject takes precedence over values.

# The path is relative to the spec.source.path directory defined above
valueFiles:
  - values-prod.yaml

# Ignore locally missing valueFiles when installing Helm chart. Defaults to false
ignoreMissingValueFiles: false

# Values file as block (YAML). Prefer to use valuesObject if possible (see below)
values: |
  ingress:
    enabled: true
    path: /
    hosts:
      - mydomain.example.com
    annotations:
      kubernetes.io/ingress.class: nginx
      kubernetes.io/tls-acme: "true"
    labels: {}
    tls:
      - secretName: mydomain-tls
        hosts:
          - mydomain.example.com

# Values as a native object. This takes precedence over `values`
valuesObject:
  ingress:
    enabled: true
    path: /
    hosts:
      - mydomain.example.com
    annotations:
      kubernetes.io/ingress.class: nginx
      kubernetes.io/tls-acme: "true"
    labels: {}
    tls:
      - secretName: mydomain-tls
        hosts:
          - mydomain.example.com

Other Helm options

Argo CD supports additional Helm options that affect templating and installation:

# Skip custom resource definition installation if chart contains CRDs
skipCrds: false

# Skip schema validation if chart contains JSON schema validation. Defaults to false
skipSchemaValidation: false

# Optional Helm version to template with. If omitted, Argo CD will decide which Helm binary to use automatically.
# Valid values: 'v2' or 'v3'
version: v3

# You can specify the Kubernetes version to pass to Helm when templating manifests.
# The value must be semver formatted.
kubeVersion: "1.30.0"

# You can specify additional API versions to pass to Helm when templating.
# Format: [group]/version/kind (or just version/kind)
apiVersions:
  - traefik.io/v1alpha1/TLSOption
  - v1/Service

# Optional namespace to template with. If left empty, defaults to the app's destination.
namespace: custom-namespace

Argo CD also supports other customization tools such as Kustomize. This lesson focuses on Helm, but here is a reference Kustomize block for completeness:

kustomize:
  # Optional kustomize version. Note: version must be configured in argocd-cm ConfigMap
  version: v3.5.4
  namePrefix: prod-
  nameSuffix: -some-suffix
  commonLabels:
    foo: bar
  commonAnnotations:
    beep: boop-${ARGOCD_APP_REVISION}
  commonAnnotationsEnvsubst: true
  labelWithoutSelector: false
  labelIncludeTemplates: false
  forceCommonLabels: false
  forceCommonAnnotations: false
  images:
    - quay.io/argoprojlabs/argocd-e2e-container:0.2
    - my-app=gcr.io/my-repo/my-app:0.1
  namespace: custom-namespace
  replicas:
    - name: kustomize-guestbook-ui
      count: 4
  components:
    - ./component

Example Helm chart (repo) — values and templates

The demo repository contains a simple Helm chart (v1.0.0) with a values.yaml and templates that render a ConfigMap and a Deployment. Default values.yaml (chart defaults):

replicaCount: 1

image:
  repository: siddharth67/php-random-shapes:v1
  pullPolicy: IfNotPresent
  # Overrides the image tag whose default is the chart appVersion.
  tag: ""

imagePullSecrets: []
nameOverride: ""
fullnameOverride: ""

service:
  type: ClusterIP
  port: 80
  targetPort: 80

color:
  circle: black
  oval: black
  triangle: black
  rectangle: black
  square: black

templates/configmap.yaml (reads color values from chart values):

apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  CIRCLE_COLOR: {{ .Values.color.circle }}
  OVAL_COLOR: {{ .Values.color.oval }}
  SQUARE_COLOR: {{ .Values.color.square }}
  TRIANGLE_COLOR: {{ .Values.color.triangle }}
  RECTANGLE_COLOR: {{ .Values.color.rectangle }}

templates/deployment.yaml (uses values for replicas, image, envFrom configmap):

apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ .Release.Name }}-deploy
  labels:
    {{- include "random-shapes.labels" . | nindent 4 }}
spec:
  replicas: {{ .Values.replicaCount }}
  selector:
    matchLabels:
      {{- include "random-shapes.selectorLabels" . | nindent 6 }}
  template:
    metadata:
      {{- with .Values.podAnnotations }}
      annotations:
        {{- toYaml . | nindent 8 }}
      {{- end }}
      labels:
        {{- include "random-shapes.selectorLabels" . | nindent 8 }}
    spec:
      containers:
        - name: {{ .Chart.Name }}
          image: "{{ .Values.image.repository }}"
          imagePullPolicy: {{ .Values.image.pullPolicy }}
          envFrom:
            - configMapRef:
                name: {{ .Release.Name }}-configmap

When Argo CD detects this chart in a repo, the UI pre-populates fields from the chart’s default values.yaml. If you don’t provide any overrides, Argo CD will deploy using those chart defaults.

Screenshot of a web UI for creating a Helm release, showing a parameters form with entries like color.circle, color.oval, color.rectangle all set to "black" and image repository/pullPolicy fields. A navigation sidebar with applications is visible on the left.

Create the Application in Argo CD with your desired sync options (for example, automatic sync, auto-create namespace, destination server set to in-cluster). By default the chart renders with the chart’s default values (all shapes black, service type ClusterIP, image from values.yaml). The Deployment and Pod should appear in the target namespace (for example, helm-chart). Here is the Application resource tree showing the deployed resources:

A web dashboard screenshot (Argo CD) showing the "helm-random-shapes" application with "Healthy" and "Synced" status. The main pane displays a visual resource tree linking configmap, service, deployment, replica set and pod components.

Updating values from the Argo CD UI

Argo CD offers multiple ways to change Helm values after the Application has been created:

Upload a values.yaml file to the Application
Edit values (YAML block)
Edit valuesObject (map form)
Edit parameters (name/value list — highest precedence)

Example inline values override added in the UI or to the Application manifest:

color:
  circle: red
service:
  type: NodePort

After saving, Argo CD re-renders the manifests and applies the updated resources. For example, the ConfigMap will change to reflect the override:

apiVersion: v1
kind: ConfigMap
metadata:
  name: helm-random-shapes-configmap
  namespace: helm-chart
data:
  CIRCLE_COLOR: red
  OVAL_COLOR: black
  RECTANGLE_COLOR: black
  SQUARE_COLOR: black
  TRIANGLE_COLOR: black

If you change service type to NodePort, the Service manifest updates accordingly:

apiVersion: v1
kind: Service
metadata:
  name: helm-random-shapes-service
  namespace: helm-chart
spec:
  type: NodePort
  ports:
    - name: http
      nodePort: 31592
      port: 80
      protocol: TCP
      targetPort: 80
  selector:
    app.kubernetes.io/instance: helm-random-shapes
    app.kubernetes.io/name: random-shapes-chart

Updating a ConfigMap consumed by a Deployment (via envFrom) does not automatically restart running pods. To make pods pick up the new environment variables, perform a rollout restart on the Deployment, or use Argo CD reconciliation policies to trigger pod replacement.

Example command to restart the deployment so new pods pick up updated ConfigMap values:

kubectl rollout restart deployment helm-random-shapes-deploy -n helm-chart

After the rollout, new pods will read the updated environment variables and the application behavior (e.g., circle color) will change accordingly.

Overriding using Parameters (highest precedence)

Argo CD exposes Helm parameters (a list of name/value pairs) that take the highest precedence when templating. Parameters are useful for single-value overrides or when you prefer a flat list. Example parameters entry:

parameters:
  - name: "color.circle"
    value: "green"

If the same key is present in both values (or valuesObject) and parameters, the value from parameters will be used. For example:

values sets color.circle: red
parameters sets color.circle: green
Result in rendered manifests: CIRCLE_COLOR: green

Precedence summary: when multiple Helm override mechanisms are used, Argo CD applies them in a defined order — last overrides win. Use the precedence table below to decide where to place your overrides.

Helm values precedence (Argo CD ordering)

From lowest to highest precedence:

Precedence rank	Source / Mechanism	Notes
1 (lowest)	chart defaults (`values.yaml` in chart)	Used only if not overridden
2	valueFiles (`valueFiles` list)	Files processed in listed order; later files override earlier ones
3	`values` (inline YAML block)	Raw YAML block in Application spec
4	`valuesObject` (map)	Native object; overrides `values`
5 (highest)	`parameters` (name/value list)	Highest precedence; last parameter entry wins for duplicate names

Additional notes on duplicates and ordering:

If the same parameter is supplied multiple times, the last occurrence wins.
If valueFiles includes multiple files, the last file in the list has the highest priority among them.
If a single values file contains duplicate keys, the last occurrence in the file wins.
valuesObject overrides values when both are present.
parameters override everything else.

Examples: valueFiles ordering:

valueFiles:
  - values-file-1.yaml
  - values-file-2.yaml

If values-file-1.yaml contains param1: value1 and values-file-2.yaml contains param1: value2, the effective value is value2. parameters duplicate example:

parameters:
  - name: "param1"
    value: value2
  - name: "param1"
    value: value1

Effective result: param1=value1 (last parameter entry wins). values block duplicate example:

values: |
  param1: value2
  param1: value5

Effective result: param1=value5 (last value in the block wins).

Additional example — Helm chart from a Helm repo

When using a Helm repository as repoURL, set spec.source.chart and spec.source.targetRevision (chart version). Example Application:

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: sealed-secrets
  namespace: argocd
spec:
  project: default
  source:
    chart: sealed-secrets
    repoURL: https://bitnami-labs.github.io/sealed-secrets
    targetRevision: 1.16.1
    helm:
      releaseName: sealed-secrets
  destination:
    server: "https://kubernetes.default.svc"
    namespace: kubeseal

When using a Git repo as repoURL, targetRevision is a Git revision (branch/tag/commit), and path points to the chart inside the repository.

References and further reading

Argo CD Official Docs: https://argo-cd.readthedocs.io/
Helm Documentation: https://helm.sh/docs/
Kubernetes Concepts: https://kubernetes.io/docs/concepts/

This walkthrough covered deploying a Helm chart with Argo CD, how to update Helm values via UI or manifests, and how Argo CD determines which override mechanism wins during templating.

ArgoCD

Argo Workflow

Argo Rollouts

Argo Events

Introduction

Demo Deploy Apps using HELM Chart

Argo CD Application spec (Helm)

Example: valueFiles / values / valuesObject

Other Helm options

Example Helm chart (repo) — values and templates

Updating values from the Argo CD UI

Overriding using Parameters (highest precedence)

Helm values precedence (Argo CD ordering)

Additional example — Helm chart from a Helm repo

References and further reading

Watch Video

​Argo CD Application spec (Helm)

​Example: valueFiles / values / valuesObject

​Other Helm options

​Example Helm chart (repo) — values and templates

​Updating values from the Argo CD UI

​Overriding using Parameters (highest precedence)

​Helm values precedence (Argo CD ordering)

​Additional example — Helm chart from a Helm repo

​References and further reading

Watch Video

Argo CD Application spec (Helm)

Example: valueFiles / values / valuesObject

Other Helm options

Example Helm chart (repo) — values and templates

Updating values from the Argo CD UI

Overriding using Parameters (highest precedence)

Helm values precedence (Argo CD ordering)

Additional example — Helm chart from a Helm repo

References and further reading