Developing Serverless Applications on Kubernetes with Knative

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© Copyright 2019 Pivotal Software, Inc. All rights Reserved.
Brian McClain
Bryan Friedman
Developing Serverless Applicatio...

Cover w/ Image
Agenda
■ What is Knative?
■ Knative Components with Examples
■ Project riff
■ Demo Application
■ Q+A

Knative: A platform for developers to
build and run serverless applications
atop Kubernetes

Eventing
How your code is
triggered by events
● Apps and functions consume
and publish event streams
● Multiple event sour...

Serving
Flexible scaling and routing to your application.
● Automatically deploy containers and configure routing
● Automa...

{app-name}.{namespace}.{custom-domain}
Serving - Deployment
n-1
n
name.default.example.com

Serving - Deployment
apiVersion: serving.knative.dev/v1alpha1
kind: Service
metadata:
name: knative-helloworld
namespace: ...

n+1
Serving - Request Handling
n-1
n
HTTP
knative-helloworld.default.dev.gswkbook.com

n+1
Serving - Scaling Up
n-1
n n n
HTTP

n+1
Serving - Scaling Down
n-1
n

Serving - Scaling Down

n+1
Serving - Scaling Down
n-1
n

Serving - Percentage-Based Routing
n-1
n
HTTP 100%
name: v1

n+1
Serving - Percentage-Based Routing
n-1
n
HTTP 100%
0%
name: v1
name: v2

n+1
Serving - Percentage-Based Routing
n-1
n
HTTP 50%
50%
name: v2
name: v1

n+1
Serving - Percentage-Based Routing
n-1
n
HTTP 0%
100%
name: v2
name: v1

Serving - Percentage-Based Routing
apiVersion: serving.knative.dev/v1alpha1
kind: Route
metadata:
name: knative-routing-de...

Build
Build and package code on-cluster.
● Builds are ran completely within Kubernetes
● Code is pulled from git at build ...

Kaniko. Build container images inside of containers
Jib. Build container images optimized for Java applications
Buildpacks...

Build
Code
Container
Image

Build
spec:
runLatest:
configuration:
build:
serviceAccountName: build-bot
source:
git:
url: https://github.com/gswk/knati...

Eventing
Robust eventing support that abstracts away the messaging layer.
● Easy for developers to consume events - No mes...

Example Event Sources
Cron Job. Produce events on a specified Cron schedule
GitHub. Events happening in a GitHub repositor...

Custom Event Sources
Event Sources are pluggable and not tightly bundled to Knative
● Community-developed event sources ar...

Eventing - Direct Delivery
Event
Source

Eventing - Fan-Out Delivery
Event
Source
Channel
Subscription
Subscription

Eventing - Channel
apiVersion: eventing.knative.dev/v1alpha1
kind: Channel
metadata:
name: knative-eventing-demo-channel
s...

Eventing - Source
apiVersion: sources.eventing.knative.dev/v1alpha1
kind: KubernetesEventSource
metadata:
name: k8sevents
...

Eventing - Subscription
apiVersion: eventing.knative.dev/v1alpha1
kind: Subscription
metadata:
name: knative-eventing-demo...

Custom Event Sources - Container Source
apiVersion: sources.eventing.knative.dev/v1alpha1
kind: ContainerSource
metadata:
...

Project riff

Evolution of Project riff

Project riff
Makes Knative Better. Tools and extensions to make the Knative
developer experience even better
riff CLI. Mak...

Project riff - Without Invokers
const express = require("express");
const bodyParser = require('body-parser')
const app = ...

Project riff - With Invokers
module.exports = x => "Hello, " + x + "!";

Project riff - Deploying Functions

Pivotal's commercially supported, opinionated
packaging of riff + Knative.
Expected to run on PKS or Kubernetes anywhere.
...

Demo

Demo Application - Earthquake Visualization

PSQL
Geocoder
Function
Frontend
USGS
Event
Source
USGS
Event
Feed
Demo Application - High-Level Visualization

Demo Application - Detailed Visualization
Geocoder
Function
Code
Frontend
Code
HTTP
1
2
3
4
Frontend
Geocoder
Function
USG...

https://pivotal.io/ebooks
Available Now
@BrianMMcClain
@bryanfriedman

Join Us At CF
Summit
@BrianMMcClain
@bryanfriedman

Questions?
Q+A

Transforming How The World Builds Software
© Copyright 2019 Pivotal Software, Inc. All rights Reserved.

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