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Create a Cluster Using WebLogic Scripting Tool (WLST)

WebLogic Scripting Tool (WLST) provides a command line scripting interface to manage WebLogic Server instances and domains. This article gives an example of cluster in an existing domain using WLST. You will need to adjust the values in the properties file and may wish to alter the script to suit your needs.

The easiest way to generate WLST scripts is to use the "Record" functionality in the Administration Console. The WLST in this article was generated in that way, then amended to replace hard-coded values with parameters.

Script

Create a file called "create_cluster.py" with the following contents.

#!/usr/bin/python
# Author : Tim Hall
# Save Script as : create_cluster.py

import time
import getopt
import sys
import re

# Get location of the properties file.
properties = ''
try:
   opts, args = getopt.getopt(sys.argv[1:],"p:h::",["properies="])
except getopt.GetoptError:
   print 'create_cluster.py -p <path-to-properties-file>'
   sys.exit(2)
for opt, arg in opts:
   if opt == '-h':
      print 'create_cluster.py -p <path-to-properties-file>'
      sys.exit()
   elif opt in ("-p", "--properties"):
      properties = arg
print 'properties=', properties

# Load the properties from the properties file.
from java.io import FileInputStream
 
propInputStream = FileInputStream(properties)
configProps = Properties()
configProps.load(propInputStream)

# Set all variables from values in properties file.
adminUsername=configProps.get("admin.username")
adminPassword=configProps.get("admin.password")
adminURL=configProps.get("admin.url")
clusterName=configProps.get("cluster.name")
clusterAddress=configProps.get("cluster.address")

# Display the variable values.
print 'adminUsername=', adminUsername
print 'adminPassword=', adminPassword
print 'adminURL=', adminURL
print 'clusterName=', clusterName
print 'clusterAddress=', clusterAddress

# Connect to the AdminServer.
connect(adminUsername, adminPassword, adminURL)

edit()
startEdit()

# Create cluster.
cd('/')
cmo.createCluster(clusterName)

cd('/Clusters/' + clusterName)
cmo.setClusterMessagingMode('unicast')
cmo.setClusterBroadcastChannel('')
cmo.setClusterAddress(clusterAddress)

save()
activate()

disconnect()
exit()

Properties

Create a file called "myDomain-cluster.properties" with the following contents.

# AdminServer connection details.
admin.username=weblogic
admin.password=Password1
admin.url=t3://ol6.localdomain:7001

# Cluster details
cluster.name=myCluster_1
cluster.address=ol6.localdomain:7002,ol6.localdomain:7003

The managed servers associated with the cluster address don't have to exist for the cluster address to be set, so this can be done pre-emptively before building the managed servers.

Run It

Create the cluster in an existing domain using the following commands.

# Set environment.
export MW_HOME=/u01/app/oracle/middleware
export WLS_HOME=$MW_HOME/wlserver_10.3
export WL_HOME=$WLS_HOME
export JAVA_HOME=/u01/app/oracle/jdk1.7.0_79
export PATH=$JAVA_HOME/bin:$PATH
export DOMAIN_HOME=/u01/app/oracle/config/domains/myDomain

. $DOMAIN_HOME/bin/setDomainEnv.sh

# Create the cluster.
java weblogic.WLST create_cluster.py -p myDomain-cluster.properties

For more information see:

Hope this helps. Regards Tim...

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