This documentation is for older versions of WSO2 products and may not be relevant now. Please see your respective product documentation for clustering details and configurations.

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In production environments, services are clustered in order to scale up applications, achieve high availability or to achieve both. By scaling up, the application supports a larger number of user requests and through high availability the service is available even if few servers are down. To support balancing of load among these servers, a load balancer is used to distribute requests among the nodes in the cluster. The nodes that receive this incoming traffic are a set of backend worker nodes in a worker/manager separated cluster or in a cluster that does not support worker/manager separation. This set of worker nodes can be either statically configured or dynamically discovered. In the static mode, new nodes cannot be added to the pre-defined set of worker nodes at runtime, while dynamic load balancers support addition and removal of worker nodes at runtime, without having to know the IP addresses and other connection details of the backend nodes beforehand.