How to restart Kubernetes running on Ubuntu LTS 20.04.3

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So I have installed Ubuntu LTS 20.04.3 on four raspberry pi 4b's computers. Then I made one the master/control plane node, and 3 worker nodes (upon installing kubernetes). It is all running great and I can also run Docker images and containers, etc. I am trying to find out the proper way to shutdown the kubernetes cluster for maintenance and then restart it, without losing all my K8S configuration.

I know I can use the shutdown command from a bash shell...for each node. But now with K8S running its cluster on top of the ubuntu operating system...I havent found any good explanations on how to shut down the nodes and the cluster properly.

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