Introduction to the Load Balancer

In a cluster environment, requests from a client must be sent to the node which becomes newly active after a failover. LifeKeeper normally handles routing by using address resolution protocol (ARP). However, since the routing by ARP does not work in the Google Cloud VPC network environment, the requests from the client need to be controlled by introducing the load balancer.

  1. Oracle client connects to the internal load balancer frontend IP address (Port 1521) to connect to Oracle listener.
  2. The primary node (lk-node01 / and the secondary node (lk-node02 / are registered as the internal load balancer target (backend). The internal load balancer performs a health check for each node and checks which node has an unused port. The packet that is received for the Oracle listener is transferred to the node. Note: The port used to respond to the health check can be specified by using the Generic ARK for Load Balancer probe reply (GenLB). Only the node where the GenLB is provided can respond to the health check.

Place the Generic ARK for Load Balancer probe reply (GenLB) package in any location and extract it (this time, ”C:\Users\lkadmin.LKDOMAIN\Downloads”). For information on how to obtain the package, please contact


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