argo-cd/docs/operator-manual/application.yaml

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: guestbook
  # You'll usually want to add your resources to the argocd namespace.
  namespace: argocd
  # Add a this finalizer ONLY if you want these to cascade delete.
  finalizers:
    - resources-finalizer.argocd.argoproj.io
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
    path: guestbook

    # helm specific config
    helm:
      # Extra parameters to set (same as setting through values.yaml, but these take precedence)
      parameters:
      - name: "nginx-ingress.controller.service.annotations.external-dns\\.alpha\\.kubernetes\\.io/hostname"
        value: mydomain.example.com
      - name: "ingress.annotations.kubernetes\\.io/tls-acme"
        value: "true"
        forceString: true # ensures that value is treated as a string

      # Release name override (defaults to application name)
      releaseName: guestbook

      # Helm values files for overriding values in the helm chart
      # The path is relative to the spec.source.path directory defined above
      valueFiles:
      - values-prod.yaml

      # Values file as block file
      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        

      # Optional Helm version to template with. If omitted it will fall back to look at the 'apiVersion' in Chart.yaml
      # and decide which Helm binary to use automatically. This field can be either 'v2' or 'v3'.
      version: v2

    # kustomize specific config
    kustomize:
      # Optional kustomize version. Note: version must be configured in argocd-cm ConfigMap
      version: v3.5.4
      # Optional image name prefix
      namePrefix: prod-
      # Optional images passed to "kustomize edit set image".
      images:
      - gcr.io/heptio-images/ks-guestbook-demo:0.2

    # directory
    directory:
      recurse: true
      jsonnet:
        # A list of Jsonnet External Variables
        extVars:
        - name: foo
          value: bar
          # You can use "code to determine if the value is either string (false, the default) or Jsonnet code (if code is true).
        - code: true
          name: baz
          value: "true"
        # A list of Jsonnet Top-level Arguments
        tlas:
        - code: false
          name: foo
          value: bar

    # plugin specific config
    plugin:
      name: mypluginname
      # environment variables passed to the plugin
      env:
        - name: FOO
          value: bar

  # Destination cluster and namespace to deploy the application
  destination:
    server: https://kubernetes.default.svc
    namespace: guestbook

  # Sync policy
  syncPolicy:
    automated: # automated sync by default retries failed attempts 5 times with following delays between attempts ( 5s, 10s, 20s, 40s, 80s ); retry controlled using `retry` field.
      prune: true # Specifies if resources should be pruned during auto-syncing ( false by default ).
      selfHeal: true # Specifies if partial app sync should be executed when resources are changed only in target Kubernetes cluster and no git change detected ( false by default ).
      allowEmpty: false # Allows deleting all application resources during automatic syncing ( false by default ).
    syncOptions:     # Sync options which modifies sync behavior
    - Validate=false # disables resource validation (equivalent to 'kubectl apply --validate=false') ( true by default ).
    - CreateNamespace=true # Namespace Auto-Creation ensures that namespace specified as the application destination exists in the destination cluster.
    - PrunePropagationPolicy=foreground # Supported policies are background, foreground and orphan.
    - PruneLast=true # Allow the ability for resource pruning to happen as a final, implicit wave of a sync operation
    # The retry feature is available since v1.7
    retry:
      limit: 5 # number of failed sync attempt retries; unlimited number of attempts if less than 0
      backoff:
        duration: 5s # the amount to back off. Default unit is seconds, but could also be a duration (e.g. "2m", "1h")
        factor: 2 # a factor to multiply the base duration after each failed retry
        maxDuration: 3m # the maximum amount of time allowed for the backoff strategy

  # Ignore differences at the specified json pointers
  ignoreDifferences:
  - group: apps
    kind: Deployment
    jsonPointers:
    - /spec/replicas