This chapter describes how to use WebLogic Scripting Tool (WLST) to retrieve information that WebLogic Server instances produce to describe their run-time state.
This chapter includes the following sections:
The Administration Server hosts the domain run-time hierarchy which provides access to any MBean on any server in the WebLogic domain. If the Administration Server is not running for a WebLogic domain, WLST can connect to individual Managed Servers to retrieve run-time data.
Accessing the run-time information for a WebLogic domain includes the following main steps:
Invoke WLST and connect to a running Administration Server instance. See Invoking WLST.
Navigate to the domain run-time MBean hierarchy by entering the domainRuntime
command.
wls:/mydomain/serverConfig>domainRuntime()
The domainRuntime
command places WLST at the root of the domain-wide run-time management objects, DomainRuntimeMBean
.
Navigate to ServerRuntimes
and then to the server instance which you are interested in monitoring.
wls:/mydomain/domainRuntime>cd('ServerRuntimes/myserver')
At the server instance, navigate to and interrogate run-time MBeans.
wls:/mydomain/domainRuntime/ServerRuntimes/myserver>cd('JVMRuntime/myserver')> wls:/mydomain/domainRuntime/ServerRuntimes/myserver/JVMRuntime/myserver>ls() -r-- HeapFreeCurrent 191881368 -r-- HeapFreePercent 87 -r-- HeapSizeCurrent 259588096 -r-- HeapSizeMax 518979584 -r-- JavaVMVendor Sun Microsystems Inc. -r-- JavaVendor Sun Microsystems Inc. -r-- JavaVersion 1.6.0_21 -r-- Name AdminServer -r-- OSName Windows XP -r-- OSVersion 5.1 -r-- Type JVMRuntime -r-- Uptime 409141 -r-x preDeregister Void : ...
The following sections provide example scripts for retrieving run-time information about WebLogic Server server instances and WebLogic domain resources.
The WLST online script in Example 8-1 navigates the domain run-time hierarchy and checks the status of a Managed Server every 5 seconds. It restarts the server if the server state changes from RUNNING
to any other status. It assumes that WLST is connected to the WebLogic domain's Administration Server.
Example 8-1 Monitoring Server State
# Node Manager needs to be running to run this script. import thread import time def checkHealth(serverName): while 1: slBean = getSLCRT(serverName) status = slBean.getState() print 'Status of Managed Server is '+status if status != "RUNNING": print 'Starting server '+serverName start(serverName, block="true") time.sleep(5) def getSLCRT(svrName): domainRuntime() slrBean = cmo.lookupServerLifecycleRuntime(svrName) return slrBean checkHealth("myserver")
The WLST online script in Example 8-2 monitors the HJVMHeapSize
for all running servers in a WebLogic domain; it checks the heap size every 3 minutes and prints a warning if the heap size is greater than a specified threshold. It assumes that the URL for the WebLogic domain's Administration Server is t3://localhost:7001
.
For information on how to run this script, see Invoking WLST.
Example 8-2 Monitoring the JVM Heap Size
waitTime=180000 THRESHOLD=300000000 uname = "weblogic" pwd = "welcome1" url = "t3://localhost:7001" def monitorJVMHeapSize(): connect(uname, pwd, url) while 1: serverNames = getRunningServerNames() domainRuntime() for name in serverNames: print 'Now checking '+name.getName() try: cd("/ServerRuntimes/"+name.getName()+"/JVMRuntime/"+name.getName()) heapSize = cmo.getHeapSizeCurrent() if heapSize > THRESHOLD: # do whatever is neccessary, send alerts, send email etc print 'WARNING: The HEAPSIZE is Greater than the Threshold' else: print heapSize except WLSTException,e: # this typically means the server is not active, just ignore # pass print "Ignoring exception " + e.getMessage() java.lang.Thread.sleep(waitTime) def getRunningServerNames(): # only returns the currently running servers in the domain return domainRuntimeService.getServerRuntimes() if __name__== "main": monitorJVMHeapSize()
Using WLST, you can configure a server instance's logging and message output.
To determine which log attributes can be configured, see "LogMBean" and "LogFileMBean" in the Oracle WebLogic Server MBean Reference. The reference also indicates valid values for each attribute.
The WLST online script in Example 8-3 sets attributes of LogMBean
(which extends LogFileMBean
). For information on how to run this script, see Invoking WLST.
Example 8-3 Configuring Logging
# Connect to the server connect("weblogic","welcome1","t3://localhost:7001") edit() startEdit() # set CMO to the server log config cd("Servers/myserver/Log/myserver") ls () # change LogMBean attributes set("FileCount", 5) set("FileMinSize", 400) # list the current directory to confirm the new attribute values ls () # save and activate the changes save() activate() # all done... exit()
The WebLogic Diagnostic Framework (WLDF) is a monitoring and diagnostic framework that can collect diagnostic data that servers and applications generate. You configure WLDF to collect the data and store it in various sources, including log records, data events, and harvested metrics. For more information, see Configuring and Using the Diagnostics Framework for Oracle WebLogic Server.
For example scripts that demonstrate using WLST to configure the WebLogic Diagnostic Framework, see "WebLogic Scripting Tool Examples" in Configuring and Using the Diagnostics Framework for Oracle WebLogic Server.
To view the collected diagnostics information using WLST, use one of the following commands to export the data from the WLDF repositories:
From WLST offline, use the exportDiagnosticData
command (see "exportDiagnosticData" in WebLogic Scripting Tool Command Reference).
From WLST online, use the exportDiagnosticDataFromServer
command (see "exportDiagnosticDataFromServer" in WebLogic Scripting Tool Command Reference)).
public interface DomainRuntimeMBean
This class is used for monitoring a WebLogic domain. A domain may contain zero or more clusters. A cluster may be looked up by a logical name.
This is a type-safe interface for a WebLogic Server MBean, which you can import into your client classes and access through weblogic.management.MBeanHome
. As of 9.0, the MBeanHome
interface and all type-safe interfaces for WebLogic Server MBeans are deprecated. Instead, client classes that interact with WebLogic Server MBeans should use standard JMX design patterns in which clients use the javax.management.MBeanServerConnection
interface to discover MBeans, attributes, and attribute types at runtime.
Date |
getActivationTime() The time when the domain became active. |
AppRuntimeStateRuntimeMBean |
getAppRuntimeStateRuntime() Returns a service from which it is possible to determine the state applications throughout the domain. |
CoherenceServerLifeCycleRuntimeMBean[] |
getCoherenceServerLifeCycleRuntimes() The CoherenceServerLifecycleRuntimeMBean for all configured Coherence servers in the domain. |
ConsoleRuntimeMBean |
getConsoleRuntime() Return the MBean which provides access to console runtime services. |
DeployerRuntimeMBean |
getDeployerRuntime() Deprecated.9.0.0.0 |
DeploymentManagerMBean |
getDeploymentManager() Provides access to the service interface to the interface that is used to deploy new customer applications or modules into this domain. |
LogRuntimeMBean |
getLogRuntime() Return the MBean which provides access to the control interface for WLS server logging. |
MessageDrivenControlEJBRuntimeMBean |
getMessageDrivenControlEJBRuntime() The MessageDrivenControlEJBRuntimeMBean for this server. |
MigratableServiceCoordinatorRuntimeMBean |
getMigratableServiceCoordinatorRuntime() Returns the service used for coordinating the migraiton of migratable services. |
MigrationDataRuntimeMBean[] |
getMigrationDataRuntimes() Returns a history of server migrations. |
WseePolicySubjectManagerRuntimeMBean |
getPolicySubjectManagerRuntime() |
ServerLifeCycleRuntimeMBean[] |
getServerLifeCycleRuntimes() The ServerLifecycleRuntimeMBean for all configured servers in the domain. |
ServiceMigrationDataRuntimeMBean[] |
getServiceMigrationDataRuntimes() Returns all the service migrations done in the domain |
SNMPAgentRuntimeMBean |
getSNMPAgentRuntime() Return the MBean which provides access to the monitoring statistics for WLS SNMP Agent. |
CoherenceServerLifeCycleRuntimeMBean |
lookupCoherenceServerLifeCycleRuntime(Stringname) Returns the Coherence server life cycle run-time MBean for the specified server. |
ServerLifeCycleRuntimeMBean |
lookupServerLifeCycleRuntime(Stringname) Returns the server life cycle run-time MBean for the specified server. |
void |
restartSystemResource(SystemResourceMBeanresource) Restarts a system resource on all nodes to which it is deployed. |
void |
setPolicySubjectManagerRuntime(WseePolicySubjectManagerRuntimeMBeanbean) |