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Re:NSA Kubernetes Hardening Guidance [pdf] by sascha_sl on Tuesday August 03, 2021 @01:34PM (#28051894)
Re:NSA Kubernetes Hardening Guidance [pdf] by antonvs on Tuesday August 03, 2021 @01:58PM (#28052122)
More directly relevant is Cluster Federation:

https://github.com/kubernetes-sigs/kubefed