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](/docs/development/images/rolling-update.png?raw=true "Rolling Updates 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.