Slides of a talk held at developer week 2016 Nuremberg by Paul Vassu and Daniel Eichten

1. Microservices
with Spring Cloud

2. Who are we?
Daniel Eichten Paul Vassu

3. What are Microservices?

4. – Wikipedia
“Microservices are a more concrete and modern
interpretation of service-oriented architectures (SOA) used to
build distributed software systems. Like in SOA, services in a
microservice architecture are processes that communicate
with each other over the network in order to fulfill a goal.
Also, like in SOA, these services use technology agnostic
protocols. Microservices architectural style is a first
realisation of SOA that has happened after the introduction
of DevOps and this is becoming the standard for building
continuously deployed systems.”

5. “Microservices are fulfilling the SOA promise!”
– us

6. By Webysther Nunes - Own work, CC BY-SA 4.0https://commons.wikimedia.org/w/index.php?curid=39594469
http://martinfowler.com/articles/microservices.html

7. https://www.thoughtworks.com/profiles/sam-newman

8. Microservices
• Small
• Focused
• Doing One Thing Well
“Microservices are small, autonomous services that work
together.” – Sam Newman
• Technology heterogenic
• Resilient
• Scalable
• Easy to deploy

10. BUT

11. Downsides
• Increased complexity
through distribution
• Dependency of Services
• Handling of breaking
changes
• Operational overhead
• Testing effort
• Distributed transactions

13. Do or don’t …

14. http://pcwallart.com/master-yoda-star-wars-wallpaper-2.html
Yoda

15. … there is no try!?

16. https://pixabay.com/en/darth-vader-star-wars-geek-1207142/

17. Spring Boot
• Convention-over-Configuration
• Creates Standalone Applications
• Embedded Container
• Autoconfiguration
• No XML SitUps
• No Yak Shaving

18. Hello Weather!

19. HTML+
jQuery
DB
App
OpenWeather

20. Controllers
Services
Repository Client
DB REST-API
HTML JS (jQuery)

21. Why Monoliths are bad!
• Changeability / Flexibility
• Maintainability
• Scalability
• Resilience
• Framework/Tech-Stack Lock-in

22. So, where to start?!?

23. HTML+
jQuery
DB
OpenWeather
Resource
Services

24. HTML+
jQuery
DB
OpenWeather
Resource
Services
Gateway

25. Spring Cloud [Netflix]
• Proxy/Router – Zuul
• Service Registry and Discovery — Eureka
• Cirtcuit Breaker — Hystrix
• (Client Side) Load Balancing — Ribbon
• Configuration Management — Archaius

26. Say hello to Zuul!

27. Works, but not nice!

28. Static routes
• are hard to maintain
• have to be updated when service instance
changes
• do not offer load balancing between multiple
instances
• do not cater for service failures

29. HTML+
jQuery
DB
OpenWeatherResource
Services
Gateway
Registry

30. HTML+
jQuery
DB
OpenWeatherResource
Services
Gateway
Registry
Services

31. Please welcome Eureka!

32. The services are still mixing
members with weather.

33. DB
OpenWeather
ServicesGateway

34. DB
OpenWeather
Services
Gateway
Services

35. DB
OpenWeather
Gateway
members
weather

36. demo

37. What’s next?

38. Distributed Tracing

39. HTML+
jQuery
DB
OpenWeather
Resource
Gateway
Registry
members
weather
Zipkin

41. Greetings Zipkin

42. Circuit Breaker

43. Why?
Gateway
A B C D E
F G H I J
Request
Request H
Request
Request
Request
Request
Request

44. Why?
99.5% uptime( )1010 components: ≈ 95% — 1 hour down / day
99.5% uptime( )2020 components: ≈ 90% — 2.5 hour down / day
99.5% uptime( )3030 components: ≈ 86% — 3+ hour down / day

45. How?
• Fail fast, fail silent, rapidly recover
• Stop cascading issues
• Fallback gracefully (where possible)
• Enable Monitoring, Alerting

46. HTML+
jQuery
DB
OpenWeather
Resource
Gateway
Registry
members
weather
turbine
hystrix
dashboard

47. Hej Hystrix/Turbine

48. One more thing
A few
s

49. Polyglotism
• different languages
• different frameworks
• different datastores
• Eureka very specific for AWS 😕
• Eureka Client lib Java only 😩

50. What about .net?
• Nancy – Microservice Framework
• Polly – Circuit Breaker
• a lot to come with ASP.Net Core
11/13 chapters done
release in Fall 2016

51. Eureka
@EnableDiscoveryClient

52. • distributed Key-Value-Store
• REST Interface
• DNS Interface #
• Multi Datacenter
• Client libs for Go, Python, PHP,
Scala, Java, Erlang, Ruby, node.js
and C#
• Replaces Eureka, Config Server,
Cloud Bus

53. • distributed Key-Value-Store
• REST Interface
• DNS Interface with SkyDNS
• very lightweight
• easy to use
• Client libs for Go, Python, Java,
Scala, node.js, Ruby, C, C++, C#,
Clojure, Erlang, PHP, Haskell, R,
…
• Replaces Eureka, Config Server

54. • distributed Key-Value-Store
• build in Java originally to do Leader Election for Hadoop
Clusters
• very mature and stable / huge community
• Client libs for Java, C#, PHP, Ruby, node.js, …
• Curator by Netflix makes things easier
• Replaces Eureka, Config Server and brings Leader Election,
e.g. for Scheduled tasks in a whole cluster.
Zookeeper

55. What else?
• Spring Cloud Task – AWS 𝜆-like API
• Spring Cloud Security – OAuth2 Infrastructure
• Spring Cloud Bus – Messaging between all
components using Redis, AMQP, RabbitMQ, …
• Spring Cloud Stream – Message driven
Microservices using Redis, Kafka, RabbitMQ, …

56. ?

57. Daniel Eichten
daniel.eichten@adidas-group.com
@danieleichten
Paul Vassu
paul.vassu@adidas-group.com
http://www.slideshare.net/DanielEichten/microservices-with-spring-cloud-63291299
https://github.com/deichten/dwx-spring-cloud
https://github.com/deichten/dwx-spring-cloud-config