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
2. Claudio E. de Oliveira Sr. Software Engineer @ZUP Innovation Java & Golang K8s, Docker & Mesh
3. 1 - What is K8s 4 - Demos 3 - Knative 2 - k8s in developer perspective Agenda Agenda
4. What is kubernetes??
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/
6. and what is kubernetes in developers perspective??
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
10. but...wait….it is not made for developers...is pretty much infrastructure for them… that is the turning point
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
13. Some examples
14. Introducing Knative Introducing Knative
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
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.
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
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/
21. we will focus on knative Serving
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.
24. knative uses extensively kubernetes objects & concepts to achieve their goal
25. Some words about infrastructure...few words… I Promise!!!!
28. but for developers there are only four main concepts to understand...
30. let's understand a little bit
32. Configuration Configuration is a definition of our software, the list of containers and environments variables required to application run
35. Revisions Snapshot of an app considering configuration, every time that configuration changes a new revision will be provisioned. In favor of immutable infrastructure
38. Routes Is the way that Knative uses to map incoming requests to a specific revision. Get traffic for our applications
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?
42. Service Manage the application's lifecycle Our application abstraction
43. let's see some knative use cases
44. Abstract infra for developer Infra for Developer Demo #1
45. Problem : k8s is a quite complex for developers deployments, services, configmaps….. Solution: Simple element Service
46. Releasing Software Releasing software Demo #2
47. Problem : release a new version of our software Solution: Release a new version using Canary Release
48. Problem : release a new version of our software Solution: Release a new version using Canary Release
49. Plus: Rollback immediately
50. Increasing Demand Auto-Scaling Rules Increase demand - Auto-Scaling Rules Demo #3
51. Problem : demand increasing our services should attend effectively Solution: Using KPA to provide elastic infrastructure
52. Plus: Scale to zero feature
53. Tips Tips
54. Bootstrap time matter (if you are using scale to zero)
55. Spring
56. Micronaut
57. Quarkus (native image)
58. Conclusions Conclusions
59. Knative is not only serverless. It is a complete platform to help developers in software delivery topic
60. Take a look on Knative Eventing it can be very helpful to work with Event Driven Architecture
61. github https://github.com/claudioed/cloud-conference-day-ops docker images are available at docker hub
62. Serverless Quarkus Serverless
63. https://developers.redhat.com/books/knative-cookbook https://www.manning.com/books/knative-in-action
64. Obrigad_!