VMware VCENTER APPLICATION DISCOVERY MANAGER 6.1 - REPOSITORY Podręcznik Użytkownika Pobierz pdf (Strona 46)

ADM User’s Guide

46 VMware, Inc.

Limitations

VI‐SDKdoesnotexposesomeinformationandthereforeADMcannotdiscoversomeCIs.Specifically,the

followingCIswillnotbediscoveredthroughVI‐SDK:

 Services

 Configurationfiles

 Licensefiles

 Installedsoftware

 Operatingsystemkernelrelatedinformation(ForExample,kernelversion)

Discovering Dependencies with Detail Discovery

Thissectionprovidesthenecessaryinformationtodecidethemethodtodiscoverdependenciesandto

configureDetailDiscoverytodiscoverdependencies.

ADM Dependency Discovery Methods

DiscoveringdependenciesisdonethroughADMusingeitherofthefollowingmethods:PassiveandDetail

DiscoverytogetheroronlyusingDetailDiscovery.

PassiveDiscoveryassumesthatapacketrepresentsadependencybetweentwohosts,forexample,there’s

mostlikelyagoodreasonthathostAsentapackettohostB.

TheshortcomingofthisassumptioninPassive

Discoverymightnotidentifytheserviceontheclient‐sideofaconnection(client‐servercommunication

usuallycontainsmuchmoreinformationontheserversidethanontheclientside)correctly.Asaresult,ADM

mightrelyonPassiveDiscoveryfordiscoveringdependencies,while

leveragingDetailDiscoverytocorrectly

identifytheserviceontheclientsideoftheconnection.

However,someclientshaveregulatory,business,orinfrastructuralbarriersthatpreventthemfromusing

PassiveDiscovery.Topenetratetheseclients,ADMallowsyoutocorrectlyidentifydependenciesusingDetail

Discoveryonly,withoutrelyingonPassiveDiscovery.



The Process of Dependency Discovery Using Only Detail Discovery

TodiscoverdependenciesusingDetailDiscovery,ADMmustleveragethecapabilitiesexposedtoitbythe

protocolitusestoconnectremotelytotheinterrogatedhost.ADMusesacross‐platformandwidelysupported

programcallednetstatforremoteshellprotocols(forexample,SSHandTelnet)andWMI.SinceWMIdoes

not

exposeanyport‐relatedinformation,netstatisusedtoruncommandsonthetargetWindowsmachine.With

SNMP,ADMinterrogatesastandardMIB2tablethatexposesinformationaboutopenTCPconnectionsand

portsusedbyapplicationsandservicesrunningontheinterrogatedhost.ADMthenusesheuristicstoguess

theprotocolsusedbythoseconnections.

Table 5‐2describeswhatADMdiscoversaboutdependenciesandhow.

OTEADMusesheuristicstoguesstheprotocolsonlyforportsthatarelowerthan512.

Table 5-2. Dependency Discovering Methodology

What How

Discovertheopenconnectionsthatthe

interrogatedhosthastootherhostsonthe

network(muchlikepassive).

ByqueryingtheservicesexposedbytheADMprotocol,asdescribed

previously.

Foreachofthoseopenconnections,discover

theservicethatisusingtheconnections.

ADMfindstheprocessID(PID)of

theservicesrunningonthehost,and

matchesupthatPIDwiththePIDofeachopenconnection.

Note:ThereisalimitationwithsomemajorOSplatforms(SunOS,AIX,

andHP‐UX)forwhichnetstatisunabletoretrievePIDinformation.On

theseplatforms,thiscapabilityisdisabled.

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