this component runs on every node that is destined for
hosting VM instances. An NC is responsible to query and control the system
software (operating system and hypervisor) and for conforming requests from its
respective Cluster Controller. The role of NC queries is to collect essential
information, such as the node’s physical resources (e.g. the number of cores and
the available disk space) and the state of VM instances on the nodes. NC sends
this information to its Cluster Controller (CC). NC is also responsible for
assisting CC to control VM instances on a node, verifying the authorization,
confirming resources availability and executing the request with the hypervisor.