Knative: k8s for Developers

Knative foi muito associado a serverless, o que é apenas uma das features propostas pelo knative.
Acredito que outras funcionalidades com abstração de deployments de serviços propõe muito mais valor para o desenvolvedor que enfrenta a complexidade dos tipos do kubernetes. Atualmente java está mais "pronto" para rodar serviços que tem baixo tempo de bootstrap e quem sabe até umas funções serverless.

Transcript

1. Knative: k8s for
   developers
   Knative: k8s for developers
   

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2. Claudio E. de Oliveira
   Sr. Software Engineer
   @ZUP Innovation
   Java & Golang
   K8s, Docker & Mesh
   

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3. 1 - What is K8s
   4 - Demos
   3 - Knative
   2 - k8s in developer perspective
   Agenda
   Agenda
   

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4. What is
   kubernetes??
   

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5. Kubernetes is a portable, extensible,
   open-source platform for managing
   containerized workloads and services, that
   facilitates both declarative configuration and
   automation
   https://kubernetes.io/docs/concepts/overview/what-is-kubernetes/
   

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6. and what is
   kubernetes in
   developers
   perspective??
   

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7. Containers
   PODs
   ReplicaSets
   Deployments
   Endpoints
   Services
   Secrets
   ConfigMaps
   Volumes / PV / PVC
   Ingress / LBs
   Networks
   K8s Primitives K8s Tools
   yamls Istio
   helm
   kubectl
   Spec and
   Status
   

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10. but...wait….it is not made for developers...is
    pretty much infrastructure for them…
    that is the turning point
    

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12. https://tanzu.vmware.com/content/blog/kubernetes-is-a-platform-for-building-platforms
    “So adopt Kubernetes. Get it running. And recognize that it’s a platform
    for running other platforms that will improve your software delivery and
    business outcomes.”
    - Richard Seroter is the VP of Product Marketing at Pivotal
    

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13. Some examples
    

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14. Introducing
    Knative
    Introducing Knative
    

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15. What is Knative???
    The purpose of Knative is to provide a simple,
    consistent layer over Kubernetes that solves
    common problems of deploying software.
    Remember:
    Kubernetes is a
    platform for building
    platforms
    

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16. Built for developers!!!!
    This layer creates a firmer boundary between the
    developer and the platform, allowing the developer
    to concentrate of the software they are directly
    responsible for.
    

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17. Built as a k8s extensions
    There is no restrictions regarding k8s
    If you need you can use full k8s resources
    it integrates with non-knative resources
    

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20. Platform teams or Platform Owners
    - Platform teams build, deploy, monitor, and are on
    call for the platform components and underlying
    platform infrastructure.
    https://martinfowler.com/articles/talk-about-platforms.html
    https://thenewstack.io/linkerd-2-0-the-service-mesh-for-service-owners-platform-architects-sres/
    

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21. we will focus on knative Serving
    

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22. How it works???
    Knative is a collection of processes, a.k.a containers,
    that run in k8s cluster. Knative uses CRDs, or
    kubernetes extensions and enables developers to use
    yamls like vanilla kubernetes.
    

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24. knative uses extensively kubernetes objects
    & concepts to achieve their goal
    

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25. Some words about
    infrastructure...few words…
    I Promise!!!!
    

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28. but for developers there are only four main
    concepts to understand...
    

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30. let's understand a
    little bit
    

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32. Configuration
    Configuration is a definition of our software, the list of
    containers and environments variables required to
    application run
    

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35. Revisions
    Snapshot of an app considering configuration, every
    time that configuration changes a new revision will be
    provisioned. In favor of immutable infrastructure
    

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38. Routes
    Is the way that Knative uses to map incoming requests
    to a specific revision.
    Get traffic for our applications
    

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39. Routes
    Questions that Routes wants to answer….
    At what public address or URL will traffic arrive from ?
    What targets can I send traffic to ?
    What percentage of traffic goes to which targets?
    

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42. Service
    Manage the application's lifecycle
    Our application abstraction
    

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43. let's see some knative use cases
    

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44. Abstract infra for
    developer
    Infra for Developer
    Demo #1
    

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45. Problem : k8s is a quite complex for
    developers deployments, services,
    configmaps…..
    Solution: Simple element Service
    

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46. Releasing
    Software
    Releasing software
    Demo #2
    

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47. Problem : release a new version of our
    software
    Solution: Release a new version using Canary
    Release
    

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48. Problem : release a new version of our
    software
    Solution: Release a new version using Canary
    Release
    

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49. Plus: Rollback immediately
    

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50. Increasing Demand
    Auto-Scaling Rules
    Increase demand - Auto-Scaling Rules
    Demo #3
    

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51. Problem : demand increasing our services
    should attend effectively
    Solution: Using KPA to provide elastic
    infrastructure
    

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52. Plus: Scale to zero feature
    

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53. Tips
    Tips
    

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54. Bootstrap time matter (if you are
    using scale to zero)
    

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55. Spring
    

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56. Micronaut
    

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57. Quarkus (native image)
    

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58. Conclusions
    Conclusions
    

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59. Knative is not only serverless. It is a
    complete platform to help
    developers in software delivery topic
    

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60. Take a look on Knative Eventing it
    can be very helpful to work with
    Event Driven Architecture
    

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61. github
    https://github.com/claudioed/cloud-conference-day-ops
    docker images are available at docker hub
    

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62. Serverless
    Quarkus
    Serverless
    

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63. https://developers.redhat.com/books/knative-cookbook https://www.manning.com/books/knative-in-action
    

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64. Obrigad_!
    

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