etcd is a critical part of the Kubernetes stack. etcd stores the state of the Kubernetes cluster, including node and workload information. Having multiple etcd members (a cluster) is a common strategy for ensuring the availability of the Kubernetes control plane, including the Kubernetes API. A highly available Kubernetes control plane is critical in production, especially when applications depend on ingress controllers, service meshes, functions-as-a-service frameworks, API gateways, and other services that integrate tightly with the Kubernetes API.
There are three high-level requirements to operating an etcd cluster in production:
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