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How do you achieve high availability for the ArgoCD control plane?

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Answer

Run ArgoCD in HA mode: multiple replicas of the API server, repo-server, and application controller (sharded), plus a redis HA/sentinel setup. Spread across nodes/zones. This ensures the control plane tolerates node failures and continues reconciling the fleet.
Real-world example The hub runs HA ArgoCD with redis-ha and multiple controller shards so a node failure doesn't stop deployments.

Common follow-ups: Which components run multiple replicas? | Why shard the controller in HA?

Applications RBAC Multi-cluster
All 29 Multi-cluster questions