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What are the hook deletion policy options? What resource kinds make good hooks and why Jobs specifically? What is the Sync phase (as opposed to PreSync/PostSync)? What are the hook phases and when does each run? What are hook deletion policies? How do you run a database migration safely before deploying a new version? What is a Skip hook and when is it used? How are hook resources named and prevented from clashing across syncs? How long does ArgoCD wait between sync waves? What is a PreSync hook typically used for?
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How do sync waves and hooks interact?

Intermediate

Answer

Hooks also honor sync waves, so you can order hooks relative to each other and to resources. Within a phase, waves determine order. PreSync hooks run (in wave order) before Sync-phase resources; PostSync hooks run after all Sync resources are Healthy. This lets you build precise ordered pipelines within a single sync.
metadata:
  annotations:
    argocd.argoproj.io/hook: PreSync
    argocd.argoproj.io/sync-wave: "-2"
Real-world example Two PreSync hooks run in wave order—first provisioning, then migration—before the app resources apply.

Common follow-ups: Do hooks respect sync waves? | How do you order multiple hooks?

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All 29 Sync Waves & Hooks questions