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Knative from an Enterprise Perspective

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Cloud Native Night February 2019, Munich: Talk by Olaf Meyer (Consol)

Join our Meetup: www.meetup.com/cloud-native-muc

Abstract: Knative is at the time being one of the most hyped frameworks for Kubernetes and OpenShift. In this talk I don't want to focus on the features from a technical point of view but rather have a look at what Knative brings to the table if you are running a cluster in an enterprise environment with different users and projects. At the end of the talk you should have a sound understanding what Knative is doing, what its benefits are, where it extends respectively conflicts with OpenShift and what its drawbacks are.

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Knative from an Enterprise Perspective

  1. 1. Knative from an Enterprise Perspective Olaf Meyer Senior Consultant 21.02.2019
  2. 2. Knative from an Enterprise Perspective Page 2 of 20 Agenda • Who am I? • What is Knative? – What is build? – What is serving? – What is eventing? • Why should I use Knative in OpenShift?
  3. 3. Knative from an Enterprise Perspective Page 3 of 20 Who am I? • Former Lotus Notes/Domino Developer • Former Web-Developer • Former Java-Developer • Former Requirements-Engineer • Currently OpenShiftler • DevOps or OpsDev? https://thatisevil.wordpress.com/2013/06/17/come-to-the-dark-side-we-have-cookies/
  4. 4. Knative from an Enterprise Perspective Page 4 of 20 What is Knative? Definition from github knative project: Knative (pronounced kay-nay-tiv) extends Kubernetes to provide a set of middleware components that are essential to build modern, source-centric, and container-based applications that can run anywhere: on premises, in the cloud, or even in a third-party data center.
  5. 5. Knative from an Enterprise Perspective Page 5 of 20 What is Knative? ● Based on Istio and Kubernetes ● About 7 months old ● Current version 0.3 ● Announcing Managed Knative on IBM Cloud Kubernetes Service (Experimental) - IBM Cloud Blog (12. Feb. 2019) ● projectriff.io (Pivotal Project) ● Triggermesh.com (Serverless management platform)
  6. 6. Knative from an Enterprise Perspective Page 6 of 20 What is Knative? Build Serving Eventing A pluggable model for building artifacts, like jar, files, zips or container from source code An event-driven model that serves the container with your application and can „scale to zero“ Common infrastructure for consuming and producing events that will stimulate applications
  7. 7. Knative from an Enterprise Perspective Page 7 of 20 Knative build ● Source-to-container build orchestration ● Using custom resource definition to define – Builds – Steps – BuildTemplates – Pipelines (separate project; may replace build in future?)
  8. 8. Knative from an Enterprise Perspective Page 8 of 20 Build and BuildTemplate Demo
  9. 9. Knative from an Enterprise Perspective Page 9 of 20 BuildTemplates ● Define your own build templates ● Use predefined build templates – Buildah – Kaniko – JIB – S2I (currently as a pull request) – and more ...
  10. 10. Knative from an Enterprise Perspective Page 10 of 20 Serving ● (Knative) Service top level resource ● Configuration represent the ‘floating HEAD’ of a history of Revisions ● Revision → immutable snapshot of code and configuration ● (Knative) route over a collection of Revisions
  11. 11. Knative from an Enterprise Perspective Page 11 of 20 Serving • Scale to zero • Autoscaler by number of requests and cpu • Source-to-URL • Split traffic between revisions
  12. 12. Knative from an Enterprise Perspective Page 12 of 20 Serving Demo
  13. 13. Knative from an Enterprise Perspective Page 13 of 20 Eventing Management and delivery of events defined by using Cloud events
  14. 14. Knative from an Enterprise Perspective Page 14 of 20 Eventing • Source → Source of events – GCP PubSub – Kubernetes Events – GitHub – Container Source (build your own event source) • Channel → Buffering and persistence of events – in-memory-channel – GCP PubSub – Kafka – NATS • Subscription → Binds service to channel
  15. 15. Knative from an Enterprise Perspective Page 15 of 20 Eventing Demo
  16. 16. Knative from an Enterprise Perspective Page 16 of 20 Why to use Knative • Scale-to-zero • Autoscaling by concurrent requests • If Builds are moved to pipelines could become interesting as extension of S2I builds • Eventing as base FaaS frameworks • Using open standard Cloud Events
  17. 17. Knative from an Enterprise Perspective Page 17 of 20 Why not to use Knative • Knative is a very young project (< 1 year) • It is alpha • Security is switched off in cluster – Requirement run as anyuid – Requirement run privileged – Use SDN plugin ovs-subnet
  18. 18. Knative from an Enterprise Perspective Page 18 of 20 Links • Knative on GitHub https://github.com/knative • Google: „Using Knative to deploy serverless applications to Kubernetes“ https://codelabs.developers.google.com/codelabs/knati ve-intro • RedHat Developer Demos: Knative Tutorial https://redhat-developer-demos.github.io/knative- tutorial/knative-tutorial/dev/index.html • Pivotal: Getting started with Knative (free and legal eBook) https://content.pivotal.io/ebooks/getting-started-with- knative
  19. 19. Vielen Dank!
  20. 20. ConSol Consulting & Solutions Software GmbH Franziskanerstr. 38 D-81669 München Tel.: +49-89-45841-100 info@consol.de www.consol.de Twitter: @consol_de

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