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OpenLMI Service usage
=====================
Some common use cases are described in the following parts.
List services
-------------
List all services available on managed machine, print whether the service has been
started (TRUE), or stopped (FALSE) and print status string of the service::
for service in c.root.cimv2.LMI_Service.instances():
print "%s:\t%s" % (service.Name, service.Status)
List only enabled by default services (automatically started on boot). Note that value
of EnabledDefault property is '2' for enabled services (and it's '3' for disabled services)::
service_cls = c.root.cimv2.LMI_Service
for service in service_cls.instances():
if service.EnabledDefault == service_cls.EnabledDefaultValues.Enabled:
print service.Name
See available information about the 'cups' service::
cups = c.root.cimv2.LMI_Service.first_instance({"Name" : "cups.service"})
cups.doc()
Start/stop service
------------------
Start and stop 'cups' service, see status::
cups = c.root.cimv2.LMI_Service.first_instance({"Name" : "cups.service"})
cups.StartService()
print cups.Status
cups.StopService()
print cups.Status
Enable/disable service
----------------------
Disable and enable 'cups' service, print EnabledDefault property::
cups = c.root.cimv2.LMI_Service.first_instance({"Name" : "cups.service"})
cups.TurnServiceOff()
print cups.EnabledDefault
cups.TurnServiceOn()
print cups.EnabledDefault
Indications
-----------
OpenLMI Service provider is able (using indication manager and polling) to emit indication
event upon service (i. e. :ref:`LMI_Service <LMI-Service>` instance) property modification
(:ref:`LMI_ServiceInstanceModificationIndication <LMI-ServiceInstanceModificationIndication>`).
This is useful mainly for being notified when a service has changed state (has been started,
or stopped).
In order to receive indications, create instances of CIM_IndicationFilter (which indications
should be delivered), CIM_IndicationHandler (what to do with those indications) and
CIM_IndicationSubscription (links filter and handler together).
The following example in LMIShell does it all in one step::
c.subscribe_indication(
Name="service_modification",
QueryLanguage="DMTF:CQL",
Query="SELECT * FROM LMI_ServiceInstanceModificationIndication WHERE SOURCEINSTANCE ISA LMI_Service",
CreationNamespace="root/interop",
SubscriptionCreationClassName="CIM_IndicationSubscription",
FilterCreationClassName="CIM_IndicationFilter",
FilterSystemCreationClassName="CIM_ComputerSystem",
FilterSourceNamespace="root/cimv2",
HandlerCreationClassName="CIM_IndicationHandlerCIMXML",
HandlerSystemCreationClassName="CIM_ComputerSystem",
Destination="http://localhost:12121"
)
Indications are sent to the location specified in 'Destination' argument.
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