- Oracle WebLogic Server 12c Advanced Administration Cookbook
- Dalton Iwazaki
- 351字
- 2021-08-20 16:48:48
Using Unicast for cluster communications
The Oracle WebLogic Server 12c can use either Multicast or Unicast for cluster communications. Since WebLogic version 10, the default cluster communication is the Unicast.
To improve Unicast reliability it's recommended to enable two extra configurations.
Getting ready
The first thing is to add a JVM argument to every WebLogic Managed Server instance of the cluster. The Administration Server must be running to make the changes.
After adding the JVM argument, the config.xml configuration file must be manually edited to make the second change. Therefore you will need to make sure every WebLogic Server instance is down, including the Administration Server.
How to do it...
Add the JVM argument:
- Access the Administration Console with your web browser at
http://prod01.domain.local:7001/console. - Click on the Lock & Edit button to start a new edit session.
- Navigate to Configuration | Server Start by clicking on the WebLogic Server name, then on the Server Start tab.
- Add the argument
-Dweblogic.unicast.HttpPing=trueto the Arguments field. The argument must be added to all Managed Server instances ofPROD_Cluster:PROD_Server01,PROD_Server02,PROD_Server03, andPROD_Server04. Click on the Save button for every change. - Click on the Activate Changes button.
- Navigate to Domain | Control by clicking on the
PROD_DOMAINlink to the left and then on the Control tab. - Select and shut down all servers from the list.
Edit the config.xml file:
- Log in as a
wlsuser to the first machineprod01and navigate to the folder:[wls@prod01]$ cd $DOMAIN_HOME/config - Make a backup of the
config.xmlfile:[wls@prod01]$ cp config.xml config.xml_backup - Open
config.xmlto be edited:[wls@prod01]$ vi config.xml - Find the
<cluster>definition tag ofPROD_Cluster:<cluster> <name>PROD_Cluster</name> <cluster-messaging-mode>unicast</cluster-messaging-mode> </cluster> - Add the
<message-ordering-enabledtag:<cluster> <name>PROD_Cluster</name> <cluster-messaging-mode>unicast</cluster-messaging-mode> <message-ordering-enabled>true</message-ordering-enabled> </cluster> - Type
:wq!to save the file and exit. - Copy the file to all machines in the domain:
[wls@prod01]$ scp config.xml wls@prod02:$DOMAIN_HOME/config - Start the Administration Server.
How it works...
The-Dweblogic.unicast.HttpPing=true argument enables an internal health check on Unicast communications that improves its reliability.
The <message-ordering-enabled> tag forces Unicast communications to be processed in order, avoiding some issues with JNDI updates and JMS Topics.
See also
- Configuring HA WebLogic cluster parameters
- Using Multicast for cluster communications
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