High Availability with WebLogic Clusters - Oracle WebLogic Server 12c Advanced Administration - page 36

Clustering can also avoid a single point of failure. If a machine crashes, the system can still
operate with the WebLogic Manager Servers of the other machines. The architecture can
grow and scale horizontally by adding more WebLogic Server instances to the cluster and
distributing them to new machines.
Creating a WebLogic cluster
A WebLogic cluster is normally created with the domain using the Configuration Wizard tool.
The cluster can also be created and added to an existing domain by using the Administration
Console. This recipe will cover adding a new cluster to the existing PROD_DOMAIN domain.
A WebLogic cluster was previously created using Coniguration Wizard earlier in this topic.
The same cluster will be created this time, but with four Manager Server instances instead
of two. So remove the original cluster before creating the new cluster.
The new cluster will be called PROD_Cluster with four WebLogic Server instances
PROD_Server01 , PROD_Server02 , PROD_Server03 , and PROD_Server04 . Machine
prod01 will host the instances PROD_Server01 and PROD_Server02 and machine
prod02 will host the instances PROD_Server03 and PROD_Server04 .
PROD_DOMAIN Topology:
PROD_DOMAIN
|___ PROD_AdminServer
|
|___ PROD_Cluster
|___ PROD_Server01
|___ PROD_Server02
|___ PROD_Server03
|___ PROD_Server04
Machine distribution, WebLogic Server instances, and listen ports Topology:
Machine
|___ prod01
| |_______ PROD_AdminServer (7001)
| |_______ PROD_Server01 (8001)
| |_______ PROD_Server02 (8002)
|
|___ prod02
|_______ PROD_Server03 (8003)
|_______ PROD_Server04 (8004)