GitOps the Hard Way, with Argo CD

Failing the Sync When Two Applications Manage the Same Resource

The FailOnSharedResource option makes a sync fail when it finds a resource that another Application already manages.

A shared resource is a resource managed by more than one Argo CD Application. By default, if a resource is tracked by more than one Application, the sync proceeds anyway, and the two Applications quietly fight over it, each one reverting the other's changes. Setting FailOnSharedResource=true makes the sync fail the moment it detects a resource already tracked by another Application, so you catch the conflict instead of debugging the flapping later. The default is false.

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: todo-app
  namespace: argocd
spec:
  destination:
    namespace: default
    server: https://kubernetes.default.svc
  project