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SchoolofComputerScience

Microservices +DevOps

CharlieGarrod MichaelHilton

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Administrivia

• Homework6checkpoint– MondayDec4th

• FinalExamReview:Dec13th,2-4pmWean5409• FinalExam:Dec15th,5:30-8:30pmWean7500

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LastTime:

• Architecturalstyles

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SimpleLayersApp

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Morefunctionality

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Evenmorefunctionality

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Organizeourbackend

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Howtoscale?

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Monolith

• Whathappenswhenweneed100servers?

• Whatifwedon’tuseallmodulesequally?

• Howcanweupdateindividualmodels?

• DoallmodulesneedtousethesameDB,language,runtime,etc?

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Microservices

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Microservices shouldbe:

• Modelledaroundbusinessdomain• Cultureofautomation• Hideimplementationdetails• Decentralizedgovernance• Deployindependently• Designforfailure• Highlyobservable

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Microservice prerequisites

• RapidProvisioning• BasicMonitoring• RapidApplicationDeployment• Devops Culture

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Whyaremicroservices suchabigdeal?

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Impactondevelopmentpractices

• Amazontransitionedto“two-pizza”teams• “FullStack”developers• ”Devops”asaprereq• Livetestingandrollback• Migratingfrom“monolithtomicroservices”ispopular,but

comesatacost

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Microservices benefits

• StrongModuleBoundaries• IndependentDeployment• TechnologyDiversity

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Microservices overhead

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Microservice costs

• Distribution• EventualConsistency• Operationalcomplexity

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DiscussionofMicroservices

• Aretheyreally“new”?• Domicroservices solveproblems,orpushthemdowntheline?• Whataretheimpactsoftheaddedflexibility?• GoodArchitecturedoesn’tfixpoorlowleveldesignproblems• Beware“cargocult”• “Ifyoucan’tbuildawell-structuredmonolith,whatmakesyou

thinkmicroservices istheanswer?” – SimonBrown• LeadstomoreAPIdesigndecisions

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Microservice prerequisites

• RapidProvisioning• BasicMonitoring• RapidApplicationDeployment• Devops Culture

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DEVOPS

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WhyDevOps?

• DevelopersandOperationsdon’thavethesamegoals– Devs wanttopushnewfeatures– Opswantstokeepthesystemavailable(stable,tested,etc.)s

• PoorcommunicationbetweenDevandOps• Limitedcapacityofoperationsstaff• Wanttoreducetimetomarketfornewfeatures• Reduce“Throwitoverthefence”syndrome

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DevOpsDefinition

• “DevOpsisasetofpracticesintendedtoreducethetimebetweencommittingachangetoasystemandthechangebeingplacedintonormalproduction,whileensuringhighquality.”

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WhatareimplicationsofDevOps?

• Qualityofthecodemustbehigh– Testing

• Qualityofthebuild&deliverymechanismmustbehigh– Automation&moretesting

• Timeissplit:– Fromcommittodeploymenttoproduction– Fromdeploymenttoacceptanceintonormalproduction

• Goal-orienteddefinition– Mayuseagilemethods,continuousdeployment(CD),etc.– Likelytousetools

• Achievingitstartsbeforecommitting

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Microservices relyonDevOps

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DevOpsToolchain

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DevOpsToolchain

• Code— codedevelopmentandreview, sourcecodemanagement tools,codemerging

• Build— continuousintegration tools,buildstatus• Test— continuoustesting toolsthatprovidefeedbackon

businessrisks• Package— artifactrepository,applicationpre-deployment

staging

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DevOpsToolchaincontinued

• Release— changemanagement,releaseapprovals, releaseautomation

• Configure— infrastructureconfigurationandmanagement, InfrastructureasCode tools

• Monitor— applicationsperformancemonitoring,end–userexperience

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DevOpsToolchain- Code

• Codedevelopmentandreview• Sourcecodemanagement tools• Codemerging

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DevOpsToolchain- Code

• Codedevelopmentandreview• Sourcecodemanagement tools• Codemerging

MoreonCodeReviewin17-313

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DevOpsToolchain- Code

• Codedevelopmentandreview• Sourcecodemanagement tools• Codemerging

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DevOpsToolchain- Code

• Codedevelopmentandreview• Sourcecodemanagement tools• Codemerging

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DevOpsToolchain- Build

• Continuousintegration tools• Buildstatus

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DevOpsToolchain- Test

• Continuoustesting toolsthatprovidefeedbackonbusinessrisks

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DevOpsToolchain- Test

• Continuoustesting toolsthatprovidefeedbackonbusinessrisks

Testingtoolsmusthavetests tobevaluable!!