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What manifest formats/tools does ArgoCD support for an Application source? How do you view and manage Applications via the ArgoCD CLI? What namespace do ArgoCD Application resources live in? What is the targetRevision HEAD and when should you avoid it? How do you use Kustomize with an ArgoCD Application? What is the difference between manual and automated sync policy? What does the prune option do in a sync policy? What is selfHeal and when should you use it? How do you pin an Application to a specific Git revision or tag? What are ignoreDifferences and why are they needed?
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How do you deploy a Helm chart with ArgoCD and override values?

Intermediate

Answer

Point the source at a Helm repo (chart + targetRevision) or a Git path containing the chart, then supply overrides via helm.values (inline), helm.valueFiles, or helm.parameters. ArgoCD renders the chart with `helm template` (it doesn't use Tiller) and applies the resulting manifests, tracking them like any other resource.
source:
  repoURL: https://github.com/org/charts
  path: web
  helm:
    valueFiles: [values-prod.yaml]
    parameters:
      - name: image.tag
        value: v1.4.2
Real-world example Production overrides the image tag and replica count via a values-prod.yaml, while staging uses values-staging.yaml.

Common follow-ups: Does ArgoCD use Tiller? | valueFiles vs parameters vs inline values?

Sync & Health Multi-cluster Applications
All 29 Applications questions