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.

Dados e análise

Knative from an Enterprise
Perspective
Olaf Meyer
Senior Consultant
21.02.2019

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?

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/

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.

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)

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

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?)

Knative from an Enterprise Perspective Page 8 of 20
Build and BuildTemplate
Demo

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 ...

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

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

Knative from an Enterprise Perspective Page 12 of 20
Serving
Demo

Knative from an Enterprise Perspective Page 13 of 20
Eventing
Management and delivery of events defined by using Cloud events

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

Knative from an Enterprise Perspective Page 15 of 20
Eventing
Demo

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

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

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

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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SAA 2023 | Software Architecture Alliance, September 2023, München, Mario-Leander Reimer (@LeanderReimer, CTO bei QAware) == Dokument bitte herunterladen, falls unscharf! Please download slides if blurred! == Die Cloud hat bereits heute einen größeren CO2-Fußabdruck als die Luftfahrtindustrie, mit steigender Digitalisierung und Cloudifizierung wird sich dieser Trend fortsetzen, wenn wir nichts dagegen unternehmen. Viele Kubernetes-basierte Installationen sind gemessen am eigentlich benötigten Ressourcen Bedarf stark überdimensioniert und tragen so unnötig zur globalen Erwärmung bei. Wie sieht die Energiebilanz Ihres Clusters und Workloads aus? In diesem Vortrag zeigen wir Ansätze und Technologien, die dabei helfen K8s-Cluster grün(er) zu machen. Zunächst braucht es Transparenz: Wie sieht die Energiebilanz des Clusters und seiner Workloads aus? Erst danach lassen sich diese gezielt auf ihre Energiesparsamkeit hin optimieren. Und das ist gar nicht so schwer, also packen wir es an!

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QAware GmbH

SAA 2023 | Software Architecture Alliance, September 2023, München, Ildikó Tárkányi (Senior Software Engineer bei QAware) == Dokument bitte herunterladen, falls unscharf! Please download slides if blurred! == Der Traum von den unendlichen Weiten der Daten ist schnell ausgeträumt, wenn wir unsere APIs nicht im Griff haben. Dabei ist es egal, ob wir uns APIs zwischen unseren Services, zwischen Frontend und Backend oder zu Fremdsystemen anschauen - APIs sind ein fundamentaler Bestandteil unserer Softwarearchitektur und ohne Testautomatisierung geht gar nichts. Schlecht geschriebene Integrationstests mit selbst erfundenen Testfällen für unsere APIs können richtig nerven: Wir rufen die APIs auf und hoffen, dass genau das zurückkommt, was wir erwarten. Das geht auch anders: Wir werfen einen Blick auf andere Testansätze, bewerten, welche Aspekte diese jeweils testen und schauen zum Beispiel auf: • Contract Based Testing • Black Box Testing der OpenAPI Specs • Trace-basiertes Testing

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QAware GmbH

Cloud Native Night, Munich, September 2023, Bernhard Schaidhammer === Please download slides if blurred! === Cilium is a powerful tool for network policies and also encryption between the Kubernetes nodes. Cilium hooks deep into Kubernetes in the network stack as an plugin and can even replace the AWS CNI Plugin. This talk will share our project experiences. Topics involve: - Network Policies - Encryption - Hubble (Observability) - Installation - CLI Usage (Hubble / Cilium)

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QAware GmbH

Container Days 2023, September 2023, Hamburg, Mario-Leander Reimer (@LeanderReimer, CTO @QAware). == Dokument bitte herunterladen, falls unscharf! Please download slides if blurred! == Elasticity and unlimited scalability are the holy grail for any cloud-native application. Now you might think: “That’s easy!!! I just run my containers on a Kubernetes cluster and I am done.” But is it really that simple? Turns out it’s not! Your application as well as your cloud infrastructure and K8s cluster need to address and support these non-functional requirements. This session will have a detailed and also practical look at the different ways of autoscaling in Kubernetes. We will give an overview of the technical foundations and prerequisites, and then showcase several frameworks and technologies that can be used to flexibly autoscale your cluster and your cloud-native workloads.

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QAware GmbH

Heise DevSec 2023, September 2023, Karlsruhe, Mario-Leander Reimer (@LeanderReimer, CTO @QAware). == Dokument bitte herunterladen, falls unscharf! Please download slides if blurred! == Continuous Delivery ist allgegenwärtig. Wirklich? Viele Teams straucheln immer noch dabei, regelmäßig gut getestete und vor allem sichere Software auszuliefern. Immer mit der gleichen, guten alten Ausrede: die nicht-funktionalen Tests seien zu aufwändig und zu teuer umzusetzen. Doch genau das Gegenteil ist der Fall! In diesem Vortrag gehen wir kurz auf die aktuellen Bedrohungen und die Bedeutung früher und regelmäßiger Sicherheitstests von APIs ein. Anschließend zeigen wir, wie einfach es ist, diese Tests kontinuierlich und asynchron mit OWASP ZAP und Testkube gegen REST- und GraphQL-APIs direkt auf einem Kubernetes-Cluster auszuführen; immer dann wenn sich die API und der Service ändern.

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QAware GmbH

Cloud Native Night, Mainz, September 2023, Markus Zimmermann === Please download slides if blurred! === The topic of service mesh is still present at every major DevOps conference and is the subject of controversial discussions. A service mesh comes with the promise of implementing cross-functional requirements of microservices such as observability or secure communication without changes within the services. The operational effort and the integration of the services within the service mesh should also be problem-free. But do the common service mesh implementations keep these promises? In a client project we have gained experience with Linkerd and can say: we did not achieve the benefits without pain. We want to share these experiences and what you can take away for your next project!

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QAware GmbH

WeAreDevelopers World Congress 2023, July 2023, Mario-Leander Reimer === Please download slides if blurred! === Elasticity and unlimited scalability are the holy grail for any cloud-native application. Now you might think: “That’s easy!!! I just run my containers on a Kubernetes cluster and I am done.” But is it really that simple? Turns out it’s not! Your application as well as your cloud infrastructure and K8s cluster need to address and support these non-functional requirements. This session will have a detailed and also practical look at the different ways of autoscaling in Kubernetes. We will give an overview of the technical foundations and prerequisites, and then showcase several frameworks and technologies that can be used to flexibly autoscale your cluster and your cloud-native workloads.

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QAware GmbH

Kubernetes Community Days Munich 2023, Juli 2023, Mario-Leander Reimer The cloud already has a larger CO2 footprint than the worldwide aviation industry. With increasing digitalization and cloudification this trend will continue if we don't do anything about it. Many Kubernetes installations are greatly oversized in terms of the resources actually required and thus contribute unnecessarily to global warming. What is the energy balance of your cluster and its workloads? In this session we will discuss approaches and technologies that help to make K8s clusters green(er). First of all, transparency is needed: what is the energy balance of the cluster and its workloads? Only then we can start to optimize for better energy efficiency. And it's not that difficult, so let's get started!

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QAware GmbH

Mastering Kubernetes 2023, Juli 2023, Sonja Wegner Gute APIs sind das Herzstück erfolgreicher digitaler Produkte und Cloud-nativer Anwendungen. Doch schlecht verwaltete APIs werden schnell zum Albtraum. Damit es kein böses Erwachen gibt, setzen wir auf API Gateways: Diese sind etabliert und bekannt und helfen uns bei der Verwaltung der APIs. Sie regeln unter anderem Traffic Management, Rollout-Szenarien, Versionierung, Zugriffskontrolle und Diagnostizierbarkeit. In diesem Vortrag werden wir das Cloud-native API-Gateway-Ökosystem näher betrachten: Gloo, KrakenD, Kong, Envoy et al. Aber welches davon ist das Richtige für den Einsatz im nächsten Projekt? Lasst es uns herausfinden!

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QAware GmbH

Mastering Kubernetes 2023, Juli 2023, Mario-Leander Reimer Die Cloud hat bereits heute einen größeren CO2-Fußabdruck als die Luftfahrtindustrie, mit steigender Digitalisierung und Cloudifizierung wird sich dieser Trend fortsetzen, wenn wir nichts dagegen unternehmen. Viele Kubernetes-basierte Installationen sind gemessen am eigentlich benötigten Ressourcen Bedarf stark überdimensioniert und tragen so unnötig zur globalen Erwärmung bei. Wie sieht die Energiebilanz Ihres Clusters und Workloads aus? In diesem Vortrag zeigen wir Ansätze und Technologien, die dabei helfen K8s-Cluster grün(er) zu machen. Zunächst braucht es Transparenz: Wie sieht die Energiebilanz des Clusters und seiner Workloads aus? Erst danach lassen sich diese gezielt auf ihre Energiesparsamkeit hin optimieren. Und das ist gar nicht so schwer, also packen wir es an!

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Knative from an Enterprise Perspective

1. Knative from an Enterprise Perspective Olaf Meyer Senior Consultant 21.02.2019

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. 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. 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. 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. 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. 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. Knative from an Enterprise Perspective Page 8 of 20 Build and BuildTemplate Demo

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. 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. 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. Knative from an Enterprise Perspective Page 12 of 20 Serving Demo

13. Knative from an Enterprise Perspective Page 13 of 20 Eventing Management and delivery of events defined by using Cloud events

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. Knative from an Enterprise Perspective Page 15 of 20 Eventing Demo

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. 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. 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. Vielen Dank!

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

Knative from an Enterprise Perspective

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Knative from an Enterprise Perspective