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What is a PreSync hook typically used for? What is a PostSync hook typically used for? Can hooks use sync waves to order among themselves? How do you notify an external system after a successful deployment using hooks? How do hooks differ from plain resources with sync waves, and when do you choose each? How do you order a multi-tier application deployment with waves? How do you run post-deployment smoke tests and fail the sync if they fail? How do you coordinate hooks across multiple Applications (e.g., App of Apps)? What is a SyncFail hook and how is it used? How do you retry a failed hook Job?
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How do you seed initial data on first deployment only?

Intermediate

Answer

Use a PreSync or Sync hook Job with BeforeHookCreation deletion and idempotent seeding logic, or gate it so re-runs are no-ops. Because hooks run each sync, the seed script itself should detect existing data and skip, giving effectively run-once behavior safely.
metadata:
  annotations:
    argocd.argoproj.io/hook: PostSync
    argocd.argoproj.io/hook-delete-policy: HookSucceeded
Real-world example A seed Job checks whether the table is populated and exits early on subsequent syncs.

Common follow-ups: How do you make seeding idempotent? | Why can't you assume run-once?

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All 29 Sync Waves & Hooks questions