Problem Statement
How do you design a highly available Kubernetes control plane and what are key considerations in that design?
Explanation
For a highly available (HA) control-plane you deploy multiple API servers, controller-manager instances and schedulers across nodes, and use a highly available etcd cluster (typically odd number of members like 3, 5) spread across fault domains. You ensure load-balancing of API traffic, etcd quorum, and redundancy of worker nodes. You also handle upgrades carefully and monitor etcd health, latency and resource consumption. This design ensures the control-plane continues working even if a machine fails.
