Load balancing system, controller and method

The invention discloses a load balancing system, controller and method, and relates to the technical field of cloud computing. The system comprises the concentrated load balancing controller and load balancers, wherein the load balancing controller obtains topology information and data flow information of a load balancing cluster in the whole network, generates forwarding items for the load balancers according to a load balancing strategy, and sends the forwarding items to the scattered load balancers via a unified control interface; and the load balancers distributes data flows of the forwarding items to a background server. The load balancers scattered in the network are controlled in a centralized manner, and load balancing logics scattered in load balancing devices traditionally are brought into the concentrated load balancing controller in the unified manner, the problem that traditional load balancing is hard to manage in the unified manner is solved, the management difficulty is reduced, and the load balancing effect of the network is improved globally.