Quick hit JVM heap size change

if you tasked to change the JVM heap size in approximately 2,500 servers today.

#
# Update the Heap size
#
# ./wsadmin.sh -lang jython -f updateJVM.py
#

as = AdminConfig.getid('/Cell:YOUR_CELL_NAME/Node:YOUR_NODE_NAME/Server:YOUR_SERVER_NAME/')
jvm = AdminConfig.list('JavaVirtualMachine', as)
AdminConfig.modify(jvm, [['initialHeapSize', '512'], ['maximumHeapSize', "768"]])
AdminConfig.save()
# set the newly saved config to variables to place entries in logging
i = AdminConfig.showAttribute(jvm, "initialHeapSize")
m = AdminConfig.showAttribute(jvm, "maximumHeapSize")
print "The initial heap size is now" + i
print "The max heap size is now" + m

Of course, you can change the heap to whatever size you would like.

Stop and uninstall an application using wsadmin

Before the application can be unsinstalled it must be stopped.
Steps:

1. Open wsadmin (with jython)
1.1 Go to "WebSphere_Profile_Root"/bin
1.2 Execute
wsadmin.sh(.bat) -lang jython
1.3 Enter UserID/Password (if promted)

2. Define needed cell and node variables
2. Execute
cell=AdminConfig.list('Cell')
cellname=AdminConfig.showAttribute(cell,'name')
nodes=AdminConfig.list('Node',cell)
nodename=AdminConfig.showAttribute(nodes,'name')
-----------------------------------
(Alternative:
e.g.: nodename=NAME_OF_NODE)

3. Define application manager variable
3.1 Execut
appManager=AdminControl.queryNames
('type=ApplicationManager,cell='+cellname+',
node='+nodename+',process=,*')
3.2 To print out variable execute
print appManager

4. Assign application to variable
4.1 Execute
app=AdminControl.queryNames
('type=Application,cell='+cellname+',node='+nodename+',
process=,J2EEName=,*')
4.2 To print out variable execute
print app

5. Define application name to variable
5.1 Execute
appName=AdminControl.getAttributes(app,'name')
5.2 To print out variable execute
print appName

6. Stop application
6.1 Execute
AdminControl.invoke(appManager,'stopApplication', appName)

7. Uninstall application
7.1 Execute
AdminApp.uninstall(appName)

8. Save changes
8.1 Execute
AdminConfig.save()


Hint:
It is easier to use administrative console :-)

= Name of server (JVM) where the application is deployed
= Name of the application (not the ear-files name)

Install and start an application using wsadmin

Copy the application ear-file to /installableApps

1. Open wsadmin (with jython)
1.1 Go to "WebSphere_Profile_Root"/bin
1.2 Execute
wsadmin.sh(.bat) -lang jython
1.3 Enter UserID/Password (if promted)

2. Define needed cell and node variables
2. Execute
cell=AdminConfig.list('Cell')
cellname=AdminConfig.showAttribute(cell,'name')
nodes=AdminConfig.list('Node',cell)
nodename=AdminConfig.showAttribute(nodes,'name')
-----------------------------------
(Alternative:
e.g.: nodename=NAME_OF_NODE)


3. Install application
3.1 Execute
AdminApp.install('../installableApps/',['-appname '])

4. Save changes
4.1 Execute
AdminConfig.save()

5. Define application manager variable
5.1 Execute
appManager=AdminControl.queryNames
('type=ApplicationManager,cell='+cellname+',
node='+nodename+',process=,*')
5.2 To print out variable execute
print appManager

6. Assign application to variable
6.1 Execute
app=AdminControl.queryNames
('type=Application,cell='+cellname+',node='+nodename+',
process=,J2EEName=,*')
6.2 To print out variable execute
print app

7. Define application name to variable
7.1 Execute
appName=AdminControl.getAttributes(app,'name')
7.2 To print out variable execute
print appName

8. Start application
8.1 Execute
AdminControl.invoke(appManager, 'startApplication',appName)


Hint:
It is easier to use administrative console :-)

= Name of server (JVM) where the application is deployed
= Name of the application (not the ear-files name)