Dynamic Cluster in WebLogic 12.1.2 : New Features in WebLogic 12c

I discussed about launch of Oracle Cloud Application Foundation  and New/Changed feature in WebLogic 12.1.2 (New Installer, BSU replaced by opatch, dynamic cluster etc). In this post I am going to cover Dynamic Cluster in WebLogic Server  12.1.2

If you are new to WebLogic Server then I highly recommend you to read my previous post on WebLogic Domain, Admin & Managed Server

 

  • Dynamic Cluster is a new feature introduced in WebLogic 12.1.2 which makes creating and managing WebLogic Cluster really simple and quick.
  • In a normal WebLogic Cluster (aka Configured Cluster) you define Managed Server and add them to Cluster.
  • In Dynamic Cluster , you select number of Servers you want in Cluster and Server Template you wish to assign to Servers in this WebLogic Dynamic Cluster.
  • Servers (or Managed Server) that are part of WebLogic Dynamic Cluster will have properties taken from Server Template 
  • If you need to modify any setting for Dynamic Servers (part of Dynamic Cluster), you modify Server Template that is applicable to Dynamic Cluster.

 

 

How to create a Dynamic Cluster in WebLogic 12.1.2

1. Login to WebLogic Console : Environment -> Clusters : New -> Dynamic Cluster : Enter name of dynamic cluster and click Next

2. On “Specify Dynamic Server Properties” page specify Number of Servers that you wish to create in cluster , Server Prefix Name and Server Template (You can Create new Server Template or Clone an existing Server Template )

 

3. In “Specify Machine Bindings” specify Host where you wish to start Servers in this cluster

You can start Servers part of this cluster on

a) Any Machine that are part of this domain
b) All Servers on same Machine
c) Start Servers on sub set of Machines

Note: Machine must be configured in WebLogic Domain 

 

4. On Specify Listen Port Binding page , specify on what port these Servers (part of Dynamic Cluster) should listen

 

5. On Review Your Dynamic Cluster Configuration page , review cluster configuration page and click Finish

 

 

6. If WebLogic Domain is configured in production mode (other is development mode) then Activate Change

7. Finally Verify Server Details

 

 

You can also look at presentation from  Dave Cabelus (Senior Principal Product Manager )

 

Related/Further Reading

 

About the Author Atul Kumar

Oracle ACE, Author, Speaker and Founder of K21 Technologies & K21 Academy : Oracle Gold Partner specialising in Design, Implement, and Trainings.

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Leave a Comment:

3 comments
Mahender says August 28, 2013

Hi,

What is the use of dynamic clusters w.r.to high availability conept

Reply
    Atul Kumar says August 28, 2013

    This is similar to Normal Cluster but more flexibility (as name suggests they are dymanic and easy/quick to setup)

    Reply
Madhu K says December 14, 2014

Atul,

I have the following questions related to Dynamic Clusters

1) Can we convert non-Dynamic cluster (Configured) to a Dynamic cluster afterwards?

2) I have found in my testing that the in memory replication is automatically available (Without creating any Replication Groups) between servers in Dynamic Cluster. Is my observation correct?

3) The dynamic server list automatically propagated to the OHS plugin (mod_wl_ohs). I am able to access an application deployed to my Dynamic Cluster without touching the mod_wl_ohs.conf Is my observation correct?

Thanks
Madhu

Reply
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