Cloud datacenters, providing Infrastructure as a Service (IaaS), need to lively orchestrate numerous resource elements with diverse requirements of service provision, which most existing approaches are difficult to meet elastically. This paper presents LiveCloud, a management framework for resources in cloud datacenters. It addresses multiple management issues by employing different views of datacenter resources to satisfy various requirements for both tenants and operators. Leveraging software defined networking (SDN) techniques, LiveCloud further integrates network resources into datacenter orchestration and service provision with improved service-level agreements and faster service delivery. LiveCloud is architected as a data-centric and event-driven system with open management interfaces and service-oriented APIs to simplify system integration and service provision. The LiveCloud system has been deployed in both private and public datacenters to provide elastic cloud infrastructure for production applications.