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More in App of Apps
How do you install the root app to bootstrap an environment? What's the benefit of a single sync point in App of Apps? Does deleting a child app manifest from Git remove the child? How does App of Apps differ from ApplicationSets? How do you bootstrap a whole cluster with App of Apps? How does cascading deletion work with App of Apps? How do child applications reference different repos or paths? How do you add a new application in an App of Apps setup? How do you structure directories for an App of Apps repo? How do you manage secrets for child apps in App of Apps?
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How do you order child application deployment in App of Apps?

Intermediate

Answer

Annotate the child Application resources with sync waves so the parent applies them in order (e.g., infra/CRDs before workloads). Since the parent sync applies the Application CRs, waves on those CRs sequence when each child is created and begins syncing, letting prerequisites come up first.
# child Application manifest
metadata:
  annotations:
    argocd.argoproj.io/sync-wave: "0"   # infra first, apps later
Real-world example The ingress-controller child app (wave 0) is created before the services (wave 1) that depend on it.

Common follow-ups: What do waves order in App of Apps? | How are prerequisites handled?

Sync Waves & Hooks Applications App of Apps
All 28 App of Apps questions