The challenge facing data center network operators is to balance the need to constantly scale their networks and operations against the increasing costs of designing, building and operating these critical networks. Evolving application needs and the increasing adoption of distributed data centers is driving the need to rethink how data center networks are designed and operated. The Nokia Fabric Services System is a declarative, intent-based automation and operations toolkit that delivers agile and scalable network operations for data center and cloud environments. This document describes the Nokia Fabric Services System and explains its foundational elements and key capabilities.