Microservices: Architecture to Scale Agile

Microservices allow for scaling agile processes. This presentation shows what Microservices are, what agility is and introduces Self-contained Systems (SCS). Finally, it shows how SCS can help to scale agile processes.

1. Microservices: Architecture to Scale Agile Eberhard Wolff Fellow, innoQ @ewolff
2. http://continuous-delivery-buch.de/
3. http://microservices-buch.de/ http://microservices-book.com/
4. http://microservices-book.com/primer.html FREE!!!!
5. > Microservices > Agility > Self-contained Systems > SCS to scale agile
6. Microservices
7. Server Server Microservices: Definition > Independent deployment units > E.g. process, VMs, Docker containers > Any technology > Any infrastructure Micro Service Micro Service
8. Components Collaborate Micro Service Micro Service Link Data Replication REST Messaging
9. Possible Microservices Architecture iOS Android Web Order Search Catalog Billing Customer Backend Backend Backend
10. Real-World Example > Team = one person > Microservices-based system > Reasons > Fast and easy deployment > Clear separation
11. Microservices can do more than scaling agile!
12. Agility
13. Iterations > Work in iterations > Not following a fixed plan > “Waterfall” paper 1970 (Royce): Do it twice! > I.e. iterations are a well- known idea for very long
14. No Iterations Goal Goal
15. Iterations Goal Goal Goal Goal
16. Cross-functional Team > Need lots of skill to develop features > Have all skills in the team > Direct communication is better
17. Self Organization > Team knows best how to solve problems > Let them decide
18. Scaling
19. Scaling > Do more > Get more stories implemented > ...and running in production TODO IN PROGRESS DONE
20. Scaling > Do more > Add more people > Let the work in parallel > Build more teams
21. Organizational Approaches Scrum of Scrums Scaled Agile Framework (SAFe) Large Scale Scrum( LeSS) Agile Path
22. Organizational Approaches Scrum of Scrums Scaled Agile Framework (SAFe) Large Scale Scrum( LeSS) Agile Path Not my expertise
23. Communication > Agile means communication > Instead of written requirements > ...story cards > + direct communication
24. # Persons vs. Potential Links
25. # Persons vs. Potential Links 0 100 200 300 0 10 20 30
26. Communication is great! Need more persons
27. Depedencies and Coordination are Problems!
28. Dependencies > Feature across teams > Team must wait for other teams‘ results
29. time Team Sprint Team Sprint Team Sprint 3 sprints
30. Functionalities Technology and Architecture What Do You Communicate About? Releases
31. Can we limit the need for communication?
32. Challenges for Scaling Agile > Dependencies cause delays > Too much communication about functionalities... > ...releasing software, > ...and technologies
33. Self-contained System
34. Deployment monolith Graphics by Roman Stranghöhner, innoQ http://scs-architecture.org
35. Cut Deployment monolith along domains …
36. … wrap domain in separate web application …
37. Self-contained System (SCS) – individually deployable
38. SCS = user interface+ business logic+ data storage
39. Web user interface
40. optional API e.g. for mobile
41. Self-contained Systems should be integrated in the web interface
42. Hyperlinks to navigate between systems. System 1 System 2
43. Dynamic inclusion of content served by another application System 1 System 2
44. Logic only shared over a well defined interface.
45. Business logic can consist of microservices
46. Avoid synchronous remote calls
47. Remote API calls should be asynchronous
48. Every SCS brings its own data storage with its own (potentially redundant) data
49. Technical decisions can be made independently from other systems (programming language, frameworks, tooling, platform)
50. Domained scoped SCS enables the development, operation and maintenance of an domain by a single team. Team 1 Team 2 Team 3
51. 1 SCS = 1 Domain = 1 Web App = 1 Team = 1-n Microservices
52. SCS? iOS Android Web Order Search Catalog Billing Customer Backend Backend Backend
53. SCS? iOS Android Web Order Search Catalog Billing Customer Backend Backend Backend
54. SCS to Scale Agile
55. Challenges for Scaling Agile > Dependencies cause delays > Too much communication about functionalities... > ...releasing software, > ...and technologies
56. Challenges for Scaling Agile > Dependencies cause delays > Too much communication about functionalities... > ...releasing software, > ...and technologies
57. Conway‘s Law Architecture copies communication structures of the organization
58. Conway‘s Law: Impact Architecture and communication structures in the organization are the same thing.
59. Conway’s Law as a Limit > Organization drives architecture > Teams of experts > i.e. UI, logic & database team > Three technical artifacts
60. Logic UI Database Change Order Process!
61. time DB Team Sprint Logic Team Sprint GUI Team Sprint 3 sprints
62. Domained scoped SCS enables the development of a domain by a single team – no coordination Order Team = UI+Logic+Database
63. Challenges for Scaling Agile > Dependencies cause delays > Too much communication about functionalities... > ...releasing software, > ...and technologies
64. Deployment Monolith Stories Technical Coordination Coordinating Releases
65. Self-contained System (SCS) – individually deployable
66. Technical decisions can be made independently from other systems (programming language, frameworks, tooling, platform)
67. SCS Stories Technical Coordination Stories Technical Coordination Stories Technical Coordination Order Billing Search Release Release Release
68. Impact on Teams > More self-organization > Decide about technologies, releases etc. > Need to be more cross- functional > E.g. ops skills become more important
69. Conclusion
70. How to scale agile?
71. Define architecture to limit communication needs
72. Conclusion: SCS & Microservices > Microservices have many advantages > SCS are a way to use Microservices > …for large projects > …to scale agile
73. Conclusion: SCS & Agility > Domain in one SCS > less dependencies > less delays > less communication about functionalities > Technological freedom > less communication about technologies > Independent releases > no need to coordinate releases
74. Challenges
75. Challenges > UI integration > ...in particular for mobile / Single Page App > Architecture more important > Architecture = organization
76. Meta-Conclusion
77. How To Think About Architecture > Process has an impact on architecture > Software architecture & organization are the same
78. Thank You! @ewolff http://scs-architecture.org (Creative Commons)