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docs: clarify external clusters #3058

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Sep 25, 2023
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docs: clarify external clusters #3058

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4 changes: 4 additions & 0 deletions docs/FAQ.md
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Expand Up @@ -41,6 +41,10 @@ solution that does not follow the GitOps approach.

Yes. A k8s cluster can run multiple replicas of Argo-rollouts controllers to achieve HA. To enable this feature, run the controller with `--leader-elect` flag and increase the number of replicas in the controller's deployment manifest. The implementation is based on the [k8s client-go's leaderelection package](https://pkg.go.dev/k8s.io/client-go/tools/leaderelection#section-documentation). This implementation is tolerant to *arbitrary clock skew* among replicas. The level of tolerance to skew rate can be configured by setting `--leader-election-lease-duration` and `--leader-election-renew-deadline` appropriately. Please refer to the [package documentation](https://pkg.go.dev/k8s.io/client-go/tools/leaderelection#pkg-overview) for details.

### Can we install Argo Rollouts centrally in a cluster and manage Rollout resources in external clusters?

No you cannot do that (even though Argo CD can work that way). This is by design because the Rollout is a custom resource unknown to vanilla Kubernetes. You need the Rollout CRD as well as the controller in the deployment cluster (every cluster that will use workloads with Rollouts).

## Rollouts

### Which deployment strategies does Argo Rollouts support?
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