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You can leverage the EKS dataplane upgrade mechanism to create a gradual recreation of the node groups. This mechanism has a "Node Group update configuration." that allows you to define the following constraints on the recreation process
Number – Select and specify the number of nodes in your node group that can be updated in parallel. These nodes will be unavailable during update.
Percentage – Select and specify the percentage of nodes in your node group that can be updated in parallel. These nodes will be unavailable during update. This is useful if you have many nodes in your node group.
You can also use pod disruption budgets to maintain pod availability. see https://docs.aws.amazon.com/eks/latest/userguide/update-managed-node-group.html https://docs.aws.amazon.com/eks/latest/userguide/managed-node-update-behavior.html https://aws.github.io/aws-eks-best-practices/upgrades/#configure-poddisruptionbudgets-and-topologyspreadconstraints-to-ensure-availability-of-your-workloads-while-the-data-plane-is-upgraded
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