Geecon Prague 2016 - Thirty months of microservices
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Transcript of Geecon Prague 2016 - Thirty months of microservices
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 1
@aahoogendoorn | www.ditisagile.nl
Thirty months of microservicesStairway to heaven or highway to hell?
Sander Hoogendoornditisagile.nl
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 2
Sander Hoogendoorn
MeDad, software architect, agile coach, programmer, trainer, speaker, writerBooks, articles, conferences, courses
WorkOwner ditisagile.nlFormer CTO insurance companyFormer global agile thoughtleader Capgemini
Webwww.sanderhoogendoorn.comaahoogendoornaahoogendoorn [email protected]
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 3
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 4
As a project managerI would like to demo untested code so I embarrass myself
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 5
@aahoogendoorn | www.ditisagile.nl
Monoliths Hard to deliver, even harder to test and impossible to maintain
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 6
Who has a system that is too bigand that really should be broken up?
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 11
Dependencies will kill youA typical systems landscape
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 18
@aahoogendoorn | www.ditisagile.nl
MicroservicesBeyond the hype?
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 19
MicroservicesBeyond the hype?
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 20
Gartner hype cycle
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 21
@aahoogendoorn | www.ditisagile.nl
MicroservicesThe clear benefits
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 22
But first … a definition
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In short, the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API.
These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.
Martin Fowler
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 24
In short, the microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API.
These services are built around business capabilities and independently deployable by fully automated deployment machinery. There is a bare minimum of centralized management of these services, which may be written in different programming languages and use different data storage technologies.
Martin Fowler
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 32
Products not projectsScalableDecentralized governanceReplaceable partsHigh performanceTechnology independentPolyglot persistenceEasy to buildEasy to testEasier deployment than monoliths
MicroservicesPromises
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 33
What is a microservice exactly?How small is a microservice?Requirements in a microservice worldComponents or servicesWho owns a microservice?What technologies do you use?What protocols do you apply?How to define messagesHow to test microservicesHow to coordinate when business services run across components?How to build deployment pipelines?How does integration really work?Containers anyone?
MicroservicesBut…
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 34
Opinions, opinions, opinions
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 35
Oh and by the way…Doing microservices means that you are building a distributed system
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 36
@aahoogendoorn | www.ditisagile.nl
Are microservicesa stairway to heaven?
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@aahoogendoorn | www.ditisagile.nl
Or are they a highway to hell?
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@aahoogendoorn | www.ditisagile.nl
From the trenchesMicroservices in real life
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Where do we come from?
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Where do we come from?
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Where do we come from?
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Outsourcing didn’t work
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Where are we going to?
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For the things we have to learn before we can do them, we learn by doing them
Aristotle
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@aahoogendoorn | www.ditisagile.nl
So what did we learn?
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Microservices require an evolutionary software architecture
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@aahoogendoorn | www.ditisagile.nl
Start with some guiding principles
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 55
Client thinks in business processes, so we implement business processesWe move away from the mainframe, to a new systems landscape, consisting of micro-applications and micro-componentsRequirements and documentation are modeled rather than writtenApplications implement a single elementary business processApplications and components all have their own bounded contextApplications do not have storage, and only talk to other applications and componentsComponents have their own storage (database), and only talk to other componentsCommunication between applications and components uses a simple open protocol – JSON on REST Avoid transactional behavior as much as possible
Some guiding principles
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 56
Client thinks in business processes, so we implement business processesWe move away from the mainframe, to a new systems landscape, consisting of micro-applications and micro-componentsRequirements and documentation are modeled rather than writtenApplications implement a single elementary business processApplications and components all have their own bounded contextApplications do not have storage, and only talk to other applications and componentsComponents have their own storage (database), and only talk to other componentsCommunication between applications and components uses a simple open protocol – JSON on REST Avoid transactions as much as possible
Some guiding principles
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@aahoogendoorn | www.ditisagile.nl
Designing microservicesModular design and bounded contexts
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Doing big up-front design is dumb, doing no design up-front is even dumber
Dave Thomas
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Bounded contexts
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 72
Single responsibility principleGroup together things that change togetherSeparate things that change for different reason
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Bounded contextWhen you model larger domains, it becomes progressively harder to create this single unified model. Instead of creating a single unified model, you create several, all valid within their bounded context
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The single unified domain modelOr more often the humongous data model
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Bounded contexts
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RESTfulnessis not as easy as it seems
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 83
A small quizGuess the HTTP status codes…
Getlocalhost:8080/countries
Getlocalhost:8080/countries/42
localhost:8080/countries/GRC
localhost:8080/countries/isocode/GRC
localhost:8080/countries?isocode=“GRC”
Post or put? localhost:8080/countries
localhost:8080/countries/38
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 89
HTTP return codes cheat sheet
1**. Hold on 2**. Here you go
3**. Go away 4**. You fucked up
5**. I fucked up
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Be conservative in what you send, be liberal in what you accept
Postel’s Law
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@aahoogendoorn | www.ditisagile.nl
Testing microservices
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Fail fast, fail often, fail forward
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A (typical) service development lifecycle
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What to test?
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Even though you might have really brilliant testers…
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… please automate all your tests
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User acceptance testingMinimize to the max
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@aahoogendoorn | www.ditisagile.nl
Deploying microservicesContinuous integrationand build pipelines
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Microservices. Building a deployment pipeline
Code Developer Test Test Acceptance Test Acceptance Live
Code Developer Test Test Acceptance Test Acceptance Live
Code Developer Test Test Acceptance Test Acceptance Live
Code Developer Test Test Acceptance Test Acceptance Live
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@aahoogendoorn | www.ditisagile.nlThirty months of microservices. Stairway to heaven or highway to hell? 106
Microservices. Pipeline hell?
Code v.2 Developer Test v.2 Test v.2 Acceptance Test v.2 Acceptance v.2
Code Developer Test Test Acceptance Test Acceptance Live
Test v.2 Acceptance Test v.2 Acceptance v.2 Live v.2
Developer Test Test Acceptance Test Acceptance Live
Code v.3 Developer Test v.3
Live
Code v.2
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No one tool to rule them allWe tried Jenkins, Bamboo, Team City, GoCD and then Jenkins again…
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@aahoogendoorn | www.ditisagile.nl
Some tooling we useIntelliJSonarQubeJenkinsGit & GitlabInfrastructure as code
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DevOps is not easyIt feels like showing up at the wrong re-enactment
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Infrastructure as code (often Groovy)And guess what … we know how to do that
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In retrospectiveSome final thoughts
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Microservices are not for everyone (yet)How do we benefit from implementing microservices?
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Will it work?
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The hockey stick model
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Allow your teams to learn continuously…
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And never forgetto have fun
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References and questions
www.sanderhoogendoorn.comwww.ditisagile.nlaahoogendoornaahoogendoorn [email protected]