SpringOne 2020 Mauricio Salatino: Principal Software Engineer, Camunda

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From Java Monolith to K8s
@Salaboy @SpringOne
https://github.com/salaboy/from-monolith-to-k8s

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@Salaboy
Mauricio Salatino ( http://salaboy.com )
@Camunda / @ZeebeHQ / @LearnK8s

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Disclaimer
Live, Remote, Kubernetes, Github,
DockerHub, Java, WiFi, my laptop,
Too old to multi-task,
what can possibly go wrong?

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https://github.com/salaboy/fmtok8s-monolith/
A
Monolith

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B
https://github.com/salaboy/from-monolith-to-k8s

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https://github.com/salaboy/from-monolith-to-k8s
Cloud Native Conference

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- Understand Technical Implica9ons
- Kubernetes Ecosystem & CI/CD
- Applica>on Microservices tools & landscape
- Understand your Business
- Does your organiza>on understands what is
happening in their applica>ons?
- What brings value to your organiza>on?
How?

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Kubernetes Ecosystem

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Jenkins X
CI/CD for Kubernetes
Part of the http://cd.foundation
CI/CD is a Must

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hMps://github.com/salaboy/fmtok8s-email/
- From Source to Running in K8s
- “Trunk Based Development”
- Build and publish all the artefacts
- GitOps approach for environments using Helm
- Preview environments for PR
Jenkins X

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There is no Application

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Helm to the Rescue!
https://github.com/salaboy/fmtok8s-springone-app
https://github.com/salaboy/fmtok8s-api-gateway/blob/master/jenkins-x.yml#L7

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Hosted or Managed?

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Application Tools

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Spring Cloud Gateway

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Be Good
Cloud Native Citizens
- Kubernetes Liveness & Readiness Probes in Actuators(2.3.3)
https://spring.io/blog/2020/03/25/liveness-and-readiness-probes-with-spring-boot
- Open API

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- Consumer Driven Contract Tes>ng
- Contract
- Stub
- Test
Spring Cloud Contracts

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Business Value

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“New Proposal” Flow
Code

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- Flow buried in code
- Dealing with Changes
- Edge Cases and UnHappy Paths
- Time Based Constraints
- Implemen>ng queries / analy>cs
Considerations

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Zeebe
Distributed Workflow Engine
Microservices and Events Orchestration
•Available as
•SaaS (console.cloud.camunda.io)
•On-Prem (helm.zeebe.io)@ZeebeHQ
http://zeebe.io

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Operate

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“New Proposal” Updated Flow

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- If you are star>ng with Kubernetes
(hTps://learnk8s.io/spring-boot-kubernetes-guide)
- Kna>ve Even>ng and Spring Cloud Streams
(hTps://salaboy.com/2020/02/20/geYng-started-with-kna>ve-2020/)
- Cloud Events Orchestra>on with Kna>ve and Spring Cloud
(hTps://github.com/salaboy/orchestra>ng-cloud-events)
- JHipster for best prac>ces on how to use these tools
Next Steps

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- Kubernetes is Hard
- Op9mize decisions (i.e. what to build or integrate)
- Focus on Business Value
- Tap into Open Source communi>es for best prac>ces
Takeaways
Questions?
@Salaboy
https://github.com/salaboy/from-monolith-to-k8s
@LearnK8s