The general requirements for multi-cluster GNS are similar to those for standard GNS. Multi-cluster GNS differs from standard GNS in that multi-cluster GNS provides a single networking service across a set of clusters, rather than a networking service for a single cluster.
Requirements for Multi-Cluster GNS Networks
To provide networking service, multi-cluster Grid Naming Service (GNS) is configured using DHCP addresses, and name advertisement and resolution is carried out with the following components:
The GNS server cluster performs address resolution for GNS client clusters. A GNS server cluster is the cluster where multi-cluster GNS runs, and where name resolution takes place for the subdomain delegated to the set of clusters.
GNS client clusters receive address resolution from the GNS server cluster. A GNS client cluster is a cluster that advertises its cluster member node names using the GNS server cluster.
If you choose to use GNS, then the GNS configured at the time of installation is the primary. A secondary GNS for high availability can be configured at a later time.