VMware VCENTER APPLICATION DISCOVERY MANAGER 6.1 - REPOSITORY Podręcznik Użytkownika Pobierz pdf (Strona 47)

VMware, Inc. 47

Chapter 5 Discovery

Choosing a Method of Dependency Discovery

Table 5‐3outlinesthe differencesintheinformationthatarediscoveredthrougheitherPassiveDiscovery(PD)

orDetailDiscovery(DD)tohelpyoudeterminewhichtypetouseinyourenvironment.

NotethefollowingwhenyouareusingPassiveorDetailDiscoveryfordiscoveringdependencies:

 IfthesameconnectionisdiscoveredthroughbothPassiveandDetailDiscovery,theconnectionis

reconciledtoappearasasingleconnection;forexample,ifPassiveDiscoverydiscoverstheprotocol,

activityandtheserver‐sideservice,andDetailDiscoverydiscoverstheclient‐sideservice,thetwo

discoverieswouldbereconciledto

includealltheinformationcollectedbybothdiscoverytypes,without

redundancy.

 Theprocessofreconcilinghostsmighttakesometime.

 ADMusesthesamePassiveDiscoveryscopeIPfilterstofilterremotehosts(hostsconnectedtothe

interrogatedhost)discoveredduringDetailDiscovery.ThisfeatureavoidstheproblemofDetail

DiscoveryoverridingtheIPrangesthatwereexcludedaspartofthePassiveDiscoveryscope.

 Bydefault,DetailDiscoverypoliciesdonotdiscovernetworkdependenciesduetoissuessurrounding

performance.Thediscoveryofnetworkdependenciessubstantiallyincreasestheamountoftimeittakes

toreconcilethediscoveredresults,andsincethedefaultdeploymentofADMincludesPassiveDiscovery,

thisdefaultconfigurationstillprovidesafullview

ofthenetwork,includingnetworkdependencies.

 vCollectorsupportPassiveDiscoveryonly.

Discovertheopenportsthattheservices

runningontheinterrogatedhostareusing

tolistenforincomingconnections(“service

endpoints”).

BothnetstatandSNMPtablesexposelisteningportsthatisusedtocreate

aserviceendpointwiththatport.Anexampleofthisisdiscoveringthat

anApacheserviceis

listeningonports80and8080,evenifnoactive

connectionexistsatthetimeofthediscovery.

Guessthetop‐levelprotocolusedbythose

connections.

Toavoidfalsepositives,itisdoneonlyonlowports:<512.

Table 5-2. Dependency Discovering Methodology (Continued)

What How

Table 5-3. Comparison of Passive and Detail Discovery Information

Difference

Advantage

PD DD

Detaileddiscovereddependenciesdonotincludeactivity,whereaspassivelydiscovered

dependenciesdo.



ProtocolidentificationisbyfarmoreaccuratewithPassiveDiscovery.Thisofcourse,results

fromPassiveDiscoveryʹsspecializationinprotocolanalysis.



PassiveDiscoveryisweakindiscoveringthesourceofaconnectionforreasonsexplainedin

“A D M

DependencyDiscoveryMethods”onpage 46.



PassiveDiscoverycannotdiscovertheportsonwhichaserviceislisteningunlessaclient

sentapackettoit.



DetailDiscoverydiscoversconnectionsthatareactiveatthetimeofdiscovery,whereas

PassiveDiscoverysamplesallcommunicationtrafficonthenetwork.Thismeansthat

ephemeralconnectionshavelessofachancetobediscoveredthroughDetailDiscovery.

Note:Howevertheconnectionsthatareactiveandrepresentinganinteractionwithalive

businessapplicationarenotlikelytobeephemeral.



OnlyDetailDiscoverydiscoversdocumenteddependenciesthataredependenciesdiscovered

bylookingattheconfigurationof

service,suchasinthefilesandregistry.



1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 73 74

Komentarze do niniejszej Instrukcji

Brak uwag

VMware VCENTER APPLICATION DISCOVERY MANAGER 6.1 - REPOSITORY Podręcznik Użytkownika Strona 47

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Podręczniki do oprogramowania VMware VCENTER APPLICATION DISCOVERY MANAGER 6.1 - REPOSITORY