Cloud Reliability Patterns

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Collection of software architecture patterns we applied at Nubank to enhance the reliability of our systems. No novelty is claimed, many of the patterns are well known and documented in the software engineering literature.

Engineering

Gustavo Barrancos (@gbarrancos)
Rafael Ferreira (@rafaeldﬀ)
Cloud Reliability
Patterns @ Nubank

“Nu Minimal Keynote Template” © Nu Bank - 05.01.2014 2
Complex systems
usually operate in
failure mode
John Gall

Asynchronous Messaging
6
• Decoupling
• Pub/Sub
• Fault Isolation
• Load Distribution
• Operability

Asynchronous Messaging
7
• Concerns
• Complexity
• Harder to test
• Single Point of Failure

Blue-Green Deployments
10
“A release technique
that reduces
downtime and risk
by running two
identical production
environments: Blue
and Green”
https://docs.cloudfoundry.org/devguide/deploy-apps/blue-green.html

Blue-Green Deployments - AWS Autoscaling Groups
11
Elastic Load Balancer

Blue-Green Deployments - AWS Elastic Network
Interface
12

Pervasive monitoring - Systems Health Metrics
“Nu Minimal Keynote Template” © Nu Bank - 05.01.2014 14

17
Pervasive Monitoring - Business Metrics

Traceability - log all I/O
“Nu Minimal Keynote Template” © Nu Bank - 05.01.2014 20
2016-03-28T17:50:23.991Z [ACQUISITION] INFO - {:cid "DEFAULT.
6DTVD.PUQPE.EQ36K.4XQGO", :log :out-request, :method :get, :uri
“https://prod-customers.nubank.com.br/api/customers/
21ede21-1a6b-44dc-b731-f58279edd421"}
2016-03-28T17:50:23.993Z [CUSTOMERS] INFO - {:cid "DEFAULT.
6DTVD.PUQPE.EQ36K.4XQGO.WHBVH", :log :in-request, :method :get,
:path "/api/customers/:id"}

Traceability - Correlation Id
“Nu Minimal Keynote Template” © Nu Bank - 05.01.2014 21

Healthchecks - Heartbeats
24
Elastic Load Balancer

Circuit Breakers
28
Elastic Load Balancer

29
Questions?
(we are hiring! http://nubank.workable.com)

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Cloud Reliability Patterns

1. Gustavo Barrancos (@gbarrancos) Rafael Ferreira (@rafaeldﬀ) Cloud Reliability Patterns @ Nubank

3. Growth 3

4. Microservices 4

5. 5 Asynchronous Messaging

6. Asynchronous Messaging 6 • Decoupling • Pub/Sub • Fault Isolation • Load Distribution • Operability

7. Asynchronous Messaging 7 • Concerns • Complexity • Harder to test • Single Point of Failure

8. Asynchronous Messaging 8 Apache Kafka

9. 9 Blue - Green Deployments

10. Blue-Green Deployments 10 “A release technique that reduces downtime and risk by running two identical production environments: Blue and Green” https://docs.cloudfoundry.org/devguide/deploy-apps/blue-green.html

11. Blue-Green Deployments - AWS Autoscaling Groups 11 Elastic Load Balancer

12. Blue-Green Deployments - AWS Elastic Network Interface 12

13. 13 Pervasive Monitoring

15. 15 Riemann http://www.riemann.io

16. Pervasive monitoring - Riemann 16

17. 17 Pervasive Monitoring - Business Metrics

18. Pervasive Monitoring - Errors 18

19. 19 Traceability

20. Traceability - log all I/O “Nu Minimal Keynote Template” © Nu Bank - 05.01.2014 20 2016-03-28T17:50:23.991Z [ACQUISITION] INFO - {:cid "DEFAULT. 6DTVD.PUQPE.EQ36K.4XQGO", :log :out-request, :method :get, :uri “https://prod-customers.nubank.com.br/api/customers/ 21ede21-1a6b-44dc-b731-f58279edd421"} 2016-03-28T17:50:23.993Z [CUSTOMERS] INFO - {:cid "DEFAULT. 6DTVD.PUQPE.EQ36K.4XQGO.WHBVH", :log :in-request, :method :get, :path "/api/customers/:id"}

22. 22 Healthchecks

23. Healthchecks 23 Elastic Load Balancer

24. Healthchecks - Heartbeats 24 Elastic Load Balancer

25. 25 Deadletters

26. Deadletters 26 Elastic Load Balancer

27. 27 Circuit Breakers

28. Circuit Breakers 28 Elastic Load Balancer

29. 29 Questions? (we are hiring! http://nubank.workable.com)