As Kubernetes and micro-services have gained widespread adoption in the enterprise developer community, event-driven architectures have become the standard way to build and deploy new applications. Knative and Tekton are two Kubernetes-native technologies that make it easier than ever for developers to get started: Knative as a platform to build event-driven applications and Tekton to continuously deploy them. In this workshop you will get hands-on with Knative and Tekton to: Set up a Kubernetes cluster using KinD Deploy Knative, Octant, and Tekton and configure those services to work with your new cluster Deploy services using both Knative serving and eventing Build event-driven pipelines to deploy your services using Tekton

1. Confidential │ ©2020 VMware, Inc.
Building Event-
Driven Workflows
with Knative and
Tekton
Sam Foo, Engineer, MAPBU
Leon Stigter, Product Manager, MAPBU
SpringOne 2020

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Your Hosts for This Workshop…
Ø Engineer on Octant
Ø Kubernetes / Octant
expert
Sam Foo, Member of Technical Staff
@ GuessWhoSamFoo

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Your Hosts for This Workshop…
Ø Product Manager, turned
Developer Advocate,
turned Product Manager
again…
Ø Passionate about
Serverless, Containers,
and all things App Dev
Ø I love dadjokes,
cheesecake, and Go
@retgits
Leon Stigter, Product Manager App Toolkit

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Today’s a Special Day!
US Bowling
League Day
Viking on Planet
Mars
Knative/Tekton
Workshop

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Today’s a Special Day!
US Bowling
League Day
Viking on Planet
Mars
Knative/Tekton
Workshop

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Today’s a Special Day!
US Bowling
League Day
Viking on Planet
Mars
Knative/Tekton
Workshop

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“Once upon a time, in a land far, far away…”

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This might have been
your monolith filled
datacenter…

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And went to…We went from…
We’re Building Apps In A Different Way
App App App
Broker
Micro
Service
Micro
Service
Micro
Service
Function
API
API
API
APIEVENT
EVENT
EVENT
EVENT

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And went to…We went from…
We’re Building Apps In A Different Way
App App App
Broker
Micro
Service
Micro
Service
Micro
Service
Function
API
API
API
APIEVENT
EVENT
EVENT
EVENT

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Companies using
containers in
production
M O R E T H A N
80%
Source: CNCF survey 2019

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How can we make that
easier… for devs?

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“Leverage managed services as much as
possible and focus your engineering resources on
adding the business logic that moves the needle
for your customers.”
The Serverless Operating Model

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Even for Kubernetes development
Serverless Is a Thing
41% 34% 20%
Yes, we’re using
serverless
Nope, we’re not
using serverless
Perhaps… we’re
considering it
Source: CNCF survey 2019

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How Does That Fit Into Kubernetes?
Knative is a serverless
platform for Kubernetes.
Built on top of Kubernetes, it
abstracts away the complex
details and enabling
developers to focus on what
matters.
Knative solves the "boring
but difficult" parts of
deploying and managing
cloud native services so you
don't have to.

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Serving provides execution of
container images which run a (single)
HTTP server.
• automatic scaling to zero when not
in use
• version control / percentage
rollouts
• single abstraction (Service) for
developers to interact with
Eventing provides storage, routing,
and delivery of event notifications over
HTTP.
• pluggable storage mechanisms
• pipeline and content-based routing
mechanisms, including reply routing
• messages based on CloudEvents
envelope
Serving Eventing
What’s In The Knative Box?

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There’s more open-source…

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Tekton As a Workflow Engine
Standardize
across
languages &
environments
Works well
with popular
existing CI/CD
tools
Out-of-the-box
best practices
to ease into
development
Deploy
workflows
based on your
requirements

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Tekton As a Workflow Engine
Standardize
across
languages &
environments
Works well
with popular
existing CI/CD
tools
Out-of-the-box
best practices
to ease into
development
Deploy
workflows
based on your
requirements

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Tekton As a Workflow Engine
Standardize
across
languages &
environments
Works well
with popular
existing CI/CD
tools
Out-of-the-box
best practices
to ease into
development
Deploy
workflows
based on your
requirements

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Tekton As a Workflow Engine
Standardize
across
languages &
environments
Works well
with popular
existing CI/CD
tools
Out-of-the-box
best practices
to ease into
development
Deploy
workflows
based on your
requirements

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Leveraging Octant To Visualize The Cluster
Octant is an open source
developer-centric web
interface for Kubernetes that
allows developers:
§ A real-time overview of
their clusters
§ Connectivity to remote
clusters using port
forwarding
§ To create extensible
plugins

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How does that all work?
Let’s start with Serving

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Node
Pod
Pod
Pod
Scale Containers Based on Traffic
HTTP RouterLoadBalancer
Knative Pod
Autoscaler
Queue-Proxy
Concurrency=1
User container
Kubernetes
apiserver
Kubelet
ReplicaSet
Count = 3
Requests = 3

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Node
Pod
Scaling To and From Zero
HTTP RouterLoadBalancer
Activator
Queue-Proxy User container
Kubernetes
apiserver
Kubelet
GET / HTTP/1.1
ReplicaSet

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Node
Pod
Scaling To and From Zero
HTTP RouterLoadBalancer
Activator
Queue-Proxy User container
Kubernetes
apiserver
Kubelet
ReplicaSet
Controller

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Node
Pod
Pod
Gradual Roll-Out Of New Versions
HTTP RouterLoadBalancer
Queue-Proxy User container
Node
Pod
Queue-Proxy User container
Percent = 10
Percent = 90

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How does that all work?
What about Eventing?

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The Mystery Box of Eventing
External
System
𝒇(𝒙)
Destination
(Knative Service)
?

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Receiving Events From External Systems
External
System
Source Adapter
𝒇(𝒙)
Destination
(Knative Service)
?

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Message Delivery Using Brokers
External
System
Source Adapter Broker
𝒇(𝒙)
Destination
(Knative Service)
?

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Triggering Events Based on Rules
External
System
Source Adapter Broker
Trigger 𝒇(𝒙)
Trigger
Destination
(Knative Service)

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That sounds great, but
let’s see something in
action!

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What You’ll Do
Install KinD Get some
additional
terminal tools
Get started
with Knative
Serving
Get started
with Tekton
Get started
with Knative
Eventing

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LABS

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Thank You@retgits
@guesswhosamfoo