// If set, use this IP address or addresses for the node
	nodeIPs []net.IP

	// use this function to validate the kubelet nodeIP
	nodeIPValidator func(net.IP) error

	// If non-nil, this is a unique identifier for the node in an external database, eg. cloudprovider
	providerID string

	// clock is an interface that provides time related functionality in a way that makes it
	// easy to test the code.