Diagnosing Issues in Production with IntelliTrace and Visual Studio 11Word格式.docx

Diagnosing Issues in Production with IntelliTrace and Visual Studio 11Word格式.docx

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Exercise1:

UsingIntelliTraceinProduction4

Exercise2:

DebuggingwithIntelliTraceFilesfromProduction10

Overview

IntelliTrace–firstreleasedinVisualStudio2010–changedthegamefordebuggingbyallowingdeveloperstostep“backintime”toseehowanapplicationgotintoitscurrentstate.Byexposingeventssuchasfileandregistryaccess,exceptions,andmethodcalls,anIntelliTracefilecanprovideadetailedviewintoapplicationbehavior.Inthislab,youwilllearnhowVisualStudio11willextendthecapabilitiesofIntelliTracebeyondthedevelopmentandtestingorganizationsbyprovidingITadministratorswiththeabilitytocaptureIntelliTracefilesrunningfromproductionservers.Thesefilescanthenbeanalyzedbydeveloperstohelpdiagnoseproductionissues.

Prerequisites

InordertocompletethislabyouwillneedtheVisualStudio11virtualmachineprovidedbyMicrosoft.Formoreinformationonacquiringandusingthisvirtualmachine,pleaseseethisblogpost.

AbouttheFabrikamFiberScenario

Thissetofhands-on-labsusesafictionalcompany,FabrikamFiber,asabackdroptothescenariosyouarelearningabout.FabrikamFiberprovidescabletelevisionandrelatedservicestotheUnitedStates.TheyaregrowingrapidlyandhaveembracedWindowsAzuretoscaletheircustomer-facingwebsitedirectlytoend-userstoallowthemtoself-serviceticketsandtracktechnicians.Theyalsouseanon-premisesASP.NETMVCapplicationfortheircustomerservicerepresentativestoadministercustomerorders.

Inthissetofhands-onlabs,youwilltakepartinanumberofscenariosthatinvolvethedevelopmentandtestingteamatFabrikamFiber.Theteam,whichconsistsof8-10people,hasdecidedtouseVisualStudioapplicationlifecyclemanagementtoolstomanagetheirsourcecode,runtheirbuilds,testtheirwebsites,andplanandtracktheproject.

Exercises

Thishands-onlabincludesthefollowingexercises:

1.UsingIntelliTraceinProduction

2.DebuggingwithIntelliTraceFilesfromProduction

Estimatedtimetocompletethislab:

60minutes.

UsingIntelliTraceinProduction

Inthisexercise,youwilllearnhowtodeployanduseIntelliTraceinProductiontocapturetraceinformationforanASP.NETapplication.

3.LoginasAdam.AlluserpasswordsareP2ssw0rd.

4.LaunchInternetExplorerandclickontheFFCustomerPortalbuttoninthefavoritesbartoloadthecustomerportalforFabrikamFiberSupport（）.

Figure1

FabrikamFibercustomerportal

5.SelectafewoftheserviceticketsfromtheMyTicketssectionofthepagetoviewtheirdetailsuntilyoucomeacrossonethatindicatesthatanerroroccurredretrievingdatafromtheserver.Thisinformationisultimatelypulledfromadatabase,buttherecouldbeanynumberofreasonsforthegeneralerrormessageitself.

Figure2

Errormessageshownwhenselectingserviceticket

6.CloseInternetExplorer.

7.Typically,thefirststepindeterminingtherootcauseofanerrorlikethiswouldbetochecklogsfordetailsandperhapsastacktrace.Ifthatdoesnotprovideenoughinformation,andtheerrorisnoteasilyreproducedinadevelopmentenvironment,thedevelopmentteammayenduptakingalongtimetodeterminetherootcauseandfixtheproblem.InstallingVisualStudioorotherdebuggingtoolsinaproductionenvironmentmaynotbeanoption.

8.Nowlet’slookathowtodeployanduseIntelliTraceinaproductionenvironmenttocollecthistoricaldebuggingdata.OpenaWindowsExplorerwindowandnavigatetotherootoftheC:

drive.Notethattherearetwofoldersherethatwerecreatedaheadoftimeforouruseinthislab,c:

\IntelliTraceiswherethestandaloneIntelliTracefilesareplacedandc:

\LogFileLocationiswheretheIntelliTracefileswillbewrittentolateroninthislab.

Figure3

LocationofIntelliTracefilesfolderandlogfilefolder

9.InanExplorerwindow,right-clickontheLogFileLocationfolderandselectPropertiestoopenthePropertieswindow.WeneedtomakesurethattheIISapplicationpoolhaspermissiontousetheLogFileLocationfolder.

10.SelecttheSecuritytabandthenscrolldowntheexistinglistofgroupsandusernamestofindFabrikamFiber.Extranet.Web.PermissionswereaddedaheadoftimeinthisVM,butinaproductionenvironment,youwouldneedtomakesuretoperformthisstepyourself.

Figure4

Settingsecuritytoenablelogfilestobewritten

11.PresstheEscapekeytoexitoutofthepropertieswindow.

12.IntelliTracecanbedeployedtoaproductionenvironmentsimplybyextractingthecontentsoftheIntelliTraceCollection.cabfilethatshipswithVisualStudio11.ThistaskhasalsobeenperformedaheadoftimeintheVMforyourconvenience,sothereisnoneedforyoutoperformthisstep.

Figure5

ExtractedcontentsofIntelliTraceCollection.cabfile

Note:

Forthepurposesofthislab,theproductionsystemisthesameasourdevelopmentsystem,butthatwillnotnormallybethecase.

13.OpenaPowerShellwindowandtypethefollowingcommandtoimporttheIntelliTracePowerShellmodule:

Import-Modulec:

\IntelliTrace\Microsoft.VisualStudio.IntelliTrace.PowerShell.dll

14.ToseethecommandsprovidedbyIntelliTrace,usingthefollowingPowerShellcommand:

Get-Command*IntelliTrace*

Figure6

Searchingforcommandsthatcontain“IntelliTrace”

CommandsareprovidedtostartandstopanIntelliTracecollection,aswellastotakecheckpointsduringcollection.

15.TogethelpforanyofthePowerShellIntelliTracecommands,typesomethinglikethefollowing:

Get-HelpStart-IntelliTraceCollection

Figure7

HelpscreenfortheStart-IntelliTraceCollectioncommand

TheREMARKSsectionfromthehelplistingdescribeshowyoucangetmoredetailedexamplesofcommandusage.

16.WearenowreadytostartIntelliTracecollection.TypethefollowingPowerShellcommandtostartcollectingdatafromtheFabrikamFiber.Extranet.WebIISapplicationpoolandstoretheresulting.iTracelogfilesinthefolderwepreviouslycreated.

Start-IntelliTraceCollection"

FabrikamFiber.Extranet.Web"

c:

\IntelliTrace\collection_plan.ASP.NET.trace.xmlc:

\LogFileLocation

IntheVisualStudio11DeveloperPreview,youcanhand-editthecollectionplanfileifyouwanttomakechanges.Agraphicaleditorisexpectedtobeprovidedinalaterrelease.

17.Whenaskedtoconfirm,type“Y”andthenpresstheEnterkeytocontinue.

Figure8

Confirmingtherequesttostartacollection

18.LaunchInternetExplorerandclickontheFFCustomerPortalbuttoninthefavoritesbartoload.

19.IntelliTraceisnowsetuptogatherthedebuggingdataspecifiedinthecollectionplanconfigurationfile.Selecttheserviceticketstoreproducetheerrorthatwesawbefore.Assoonasyouseetheerror,closeInternetExplorer.

Figure9

Reproducingtheerror

20.ReturntothePowerShellwindowandtypethefollowingcommandtogetthecurrentcollectionstatus.

Get-IntelliTraceCollectionStatus-ApplicationPool"

Figure10

Collectionstatus

21.TypethefollowingcommandtostopgatheringIntelliTracedatafortheFabrikamFiber.Extranet.Webapplicationpool.Confirmtheactionwhenprompted.

Stop-IntelliTraceCollection"

AsanalternativetostoppinganIntelliTracecollection,itisalsopossibletogetacopyofthecurrentlogbyusingtheCheckpoint-IntelliTraceCollectioncommand.Thisallowsyoutolookatthedatayouhavecapturedsofarwhilecontinuingtocollectadditionaldata.

22.Inareal-worldscenario,itisatthispointthattheIntelliTracefilewouldbesenttoadeveloperortesterforamoredetailedlook.

DebuggingwithIntelliTraceFilesfromProduction

Inthisexercise,youwillseehowwecanusetheIntelliTracefilethatwasgeneratedonaproductionservertoaidindebuggingtheerrorthatwesawinthepreviousexercise.

23.Returningtoourscenario,let’sassumethatwehavealreadytakenthisIntelliTracefileandtransferredittoadevelopmentmachinethathasVisualStudio11installed.Double-clickontheIntelliTracefiletoloaditinVisualStudio11.

Figure11

LoadingtheIntelliTracefile

24.IntheIntelliTracesummarywindow,scrolldowntotheExceptionDatasection.Hereyoucanseeagridshowingallexceptionsthatoccurred.Bydefault,theyaresortedbymostrecenteventtimetotheoldest.

Figure12

ExceptionDatasectionofIntelliTracesummary

25.SelectthelastSystem.NullReferenceExceptionfoundinthelist,thatisthetechnicallytheoldestorfirstonethatwasthrown,andthenselecttheStartDebuggingbuttontostartanIntelliTracedebuggingsession.

Figure13

Startdebuggingataspecificevent

26.AftertheIntelliTracedebuggingsessionstarts,youwillseethattheIntelliTracepaneisautomaticallyloadedandthelocationincodewheretheexceptionoccurredishighlighted.YounowhavefullaccesstothenormalsuiteofIntelliTracedebuggingfunctionality.

Figure14

Debuggingthethrownexception

27.IntheLocalswindow,notethattheServiceTicket.AssignedTopropertycurrentlyhasanullvalue.ThisexplainswhyreferencingserviceTicket.AssignedTo.FullNameincoderesultedinthenullreferenceexceptionthatwesaw.Atthispoint,wecouldfileabuginTeamFoundationServerandattachtheIntelliTracefiletohelpthedevelopmentteammaketheappropriatefix.

Figure15

Findingrootcauseforexception

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