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kops/docs/development/rolling_update.md

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Rolling Updates

Upgrading and modifying a k8s cluster often requires the replacement of nodes. To not cause loss of service and other disruptions a kops uses a functionality call rolling updates. Rolling a cluster is the replacement of the masters and nodes with new cloud instances.

Rolling Update Diagram

kops executes steps 2-4 for all the masters until the masters are replaced. Then the same process is followed to replaces all nodes.