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What are the possible sync statuses of an Application? What are the health statuses ArgoCD reports? How do you force a refresh or hard refresh of an Application? What does the diff view show and how do you use it? What does OutOfSync mean and what should you do about it? What is the Degraded health status? What is a dry-run sync? How does ArgoCD determine the health of a resource? What is the difference between sync status and health status? What are sync options and give common examples?
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What is a sync in ArgoCD?

Beginner

Answer

A sync is the operation where ArgoCD applies the desired state from Git to the cluster so the live state matches. It computes the diff, orders resources (by waves/hooks), applies them, and reports success or failure. Syncs can be manual or automated, full or selective, and can run with options like prune and dry-run.
argocd app sync my-app
argocd app sync my-app --prune --dry-run
Real-world example Merging a change and clicking Sync applies the new manifests, moving the app from OutOfSync to Synced.

Common follow-ups: What triggers a sync? | What does a dry-run sync do?

Applications Sync Waves & Hooks Sync & Health
All 29 Sync & Health questions