Speaker: Tobias Bayer, Hendrik Still, inovex GmbH http://www.meetup.com/Docker-Karlsruhe/events/220797663/ mehr Meetups von inovex: http://www.meetup.com/inovex-karlsruhe http://www.meetup.com/inovex-munich http://www.meetup.com/inovex-cologne

1. Deep Dive into Dockerized Microservices
19.3.2015
Tobias Bayer & Hendrik Still

2. What are Microservices?
101
101
010
0
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3. What are Microservices?
● Split up the application into single services based on business capabilities
● Communicating with lightweight mechanisms e.g REST over HTTP (SOAP
isn’t lightweight!)
● Each Microservice is running in its own process
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4. What are the Benefits?
● Scalability
● Fault-tolerance
● Polyglot Development
● Organisational Alignment
● Small Code Bases
● Independent Deployment

5. The Challenges of Microservice Architectures
● Monitoring
● Decomposition
● Distributed Data
● Transactions
● Distributed State
● Shared Code
● Versioning
● Failure Handling
● Security
● Service Discovery
● Testing
● ...

6. Service Discovery

7. Service Discovery?
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8. Service Discovery - Different Views
Infrastructure View Application View
● one central registry
● already available
● one registry per application
● portable infrastructure
● allows application specific
features

9. Eureka
● Part of Netflix OSS
● Single purpose registry
● REST-interface
● Comes with a Java client
● Very good integration into Spring
● Allows client side load balancing via Ribbon
Eureka Logo: https://github.com/Netflix/eureka/blob/master/images/logo/eureka-logo-2624.png

10. Demo Time!
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Product-Details-Service
Product-Price-Service
Product-Service

11. Consumer-Driven
Contracts

12. Testing
Commit
Stage
Production
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Difficulties with Testing Microservices
V2
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V2
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V2
Commit
Stage
Testing Production
V2 V2 V2

13. Testing
Commit
Stage
Production
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Difficulties with Testing Microservices
V2
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V2
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V2
Commit
Stage
Testing Production
V2 V2 V2
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V1
V1
V1

14. Solution: Consumer Contracts!

15. Solution: Consumer-Driven Contract Testing

16. Pact Demo
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Product-Details-Service
Product-Price-Service
Product-Service

17. Contact
Tobias Bayer
tobias.bayer@inovex.de
Hendrik Still
hendrik.still@inovex.de
inovex GmbH
Office Karlsruhe
Ludwig-Erhard-Allee 6
76131 Karlsruhe
Thank you for listening!