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How do you handle per-cluster configuration differences? What are the failure and resilience considerations for multi-cluster ArgoCD? How does ArgoCD scale to hundreds of clusters and applications? How do you handle credentials rotation for many clusters? How do you isolate tenants across clusters? How does controller sharding distribute cluster load? What are security considerations for a hub managing many clusters? How does ApplicationSet auto-manage apps as clusters come and go?
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ArgoCD › Multi-cluster

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?

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All 29 Multi-cluster questions