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If I run kubectl get nodes on GKE, EKS, or DigitalOcean Kubernetes, I only see the worker nodes. How are these systems architected at the network or application level to create this separation between workers and masters?
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A multi-master setup protects against a wide range of failure modes, from a loss of single worker node to the failure of the master node's etcd service. By providing redundancy, a multi-master cluster serves a highly available system for your end users.
Kubernetes High-Availability is about setting up Kubernetes, along with its supporting components in a way that there is no single point of failure. A single master cluster can easily fail, while a multi-master cluster uses multiple master nodes, each of which has access to same worker nodes.
Master Nodes will be part of Control Plane, but again it is just a change in terminology and Worker nodes still have same terminology. Please see kubernetes.io/docs/concepts/overview/components to know more.
No. As you can read in Kubernetes Components section: Master components provide the cluster's control plane.
You can run the Kubernetes control plane outside Kubernetes as long as the worker nodes have network access to the control plane. This approach is used on most managed Kubernetes solutions.
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