The discovery service and global configuration store and scheduler are implemented with the etcd and kube-scheduler master components:
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etcd is a consistent and highly-available key-value (KV) store used as both the Discovery Service and Global Configuration Store.
Because the discovery service and global configuration store both hold information about the services, and each are accessible by all nodes, etcd can serve both purposes. Whenever a service registers itself with the discovery service, it will also be returned a set of configuration settings.
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kube-scheduler is a scheduler. It keeps track of which applications are unassigned to a node (and thus not running) and makes the decision as to which node to assign it ...
