Domain Delegation to Grid Naming Service

If you are configuring Grid Naming Service (GNS) for a standard cluster, then before installing Oracle Grid Infrastructure you must configure DNS to send to GNS any name resolution requests for the subdomain served by GNS.

Note:

The Highly Available Grid Naming Service feature of Grid Naming Service (GNS) in Oracle Grid Infrastructure is deprecated in Oracle Database 23ai. 

The highly-available GNS provides the ability to run multiple GNS instances in a multi-cluster environment with different roles. This feature is being deprecated. There is no replacement.

• Choosing a Subdomain Name for Use with Grid Naming Service
  To implement GNS, your network administrator must configure the DNS to set up a domain for the cluster, and delegate resolution of that domain to the GNS VIP.