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What is the App of Apps pattern? Why use the App of Apps pattern? What does the parent Application's source point to in App of Apps? In App of Apps, what is the 'root' application? 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 order child application deployment in App of Apps? How do you bootstrap a whole cluster with App of Apps? How does cascading deletion work with App of Apps?
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ArgoCD › App of Apps

How do you install the root app to bootstrap an environment?

Beginner

Answer

After installing ArgoCD, apply the root Application manifest (kubectl apply -f root.yaml or argocd app create). ArgoCD then syncs it, creating the child Applications. This single command bootstraps the environment declaratively.
kubectl apply -n argocd -f root-app.yaml
Real-world example A fresh cluster is bootstrapped by installing ArgoCD and applying the root app once.

Common follow-ups: What's the single bootstrap command? | What happens after the root syncs?

GitOps Principles Multi-cluster App of Apps
All 28 App of Apps questions