Function as a Service with Knative and riff

© Copyright 2019 Pivotal Software, Inc. All rights Reserved.
Florent Biville
4th of July = Saint Florent !
Function as a Service
with Knative and

Agenda
■ Introduction to 🗻
■ … and beneath ⚙
■ Demos 🙏
■ Q+A ❓

Florent Biville ( @fbiville)
■ riﬀer at by day
■ ambassador and trainer by night
■ Spring Paris, Hackergarten Paris co-org
■ co-founder and co-org
■ Bu cümleyi anlarsan, sunumumdan sonra konuşalım!
`who am i`

Word of caution ⚠
What you will 👀 about is
not released yet and is subject to change

What is love ?
is the open-source serverless Function As A Service platform
■ based on Kubernetes (shorthand: K8s)
■ easy to install (CNAB FTW)
■ easy to scale (via Knative serving built-in autoscaling, inc. scale-{to,from}-zero)
■ with polyglot function support (build sources via Knative build and buildpacks v3)
■ with emergent stateful streaming support
■ and an overall improved User eXperience in mind

Thanks for attending, bye!
Source: https://www.ina.fr/video/I08358793/valery-giscard-d-estaing-au-revoir-video.html

Kubernetes has become the de-facto IaaS*
*IaaS = Infrastructure as a Service

Kubernetes has become the de-facto IaaS
■ Open-source, CNCF project
■ Rich and growing ecosystem
■ Sane and simple conceptual core model
■ Generic and extensible via CRD

K8s is awesome, but!
■ Common deployment patterns complex to
implement (want to 👀 some more YAML? 🤕)
■ Perfect to build a platform on top of it …
■ … which is probably NOT the core mission of
your company 😉
Have you
heard
about

Knative to the rescue
■ 3 main components
○ Build 🛠
○ Serving 🥂
○ Eventing ⛓

Knative build
Brings a custom Build resource
The whole sequence of steps is run on the cluster,
in Builder images conﬁgured in a
(Cluster)BuildTemplate
Performs tasks such as:
■ Fetching code from repositories
■ Compiling
■ Publishing images
Current build template is based on
Buildpacks v3
apiVersion: build.knative.dev/v1alpha1
kind: BuildTemplate
metadata:
name: bazel
spec:
parameters:
- name: TARGET
description: The name of the Bazel "container_push"
target to run
steps:
- name: build-and-push
image: gcr.io/cloud-builders/bazel
args: ['run', '${TARGET}']

Buildpacks v3
■ Initially developed by Heroku & Pivotal
■ Build auto-detection (npm, Maven, Gradle…)
■ Eases the production upgrade process
■ deﬁnes its own builder and buildpacks
to detect, build and publish functions with
their corresponding invoker

Knative serving
■ Autoscaling (down-to/up-from 0)
■ Routing with Istio (service mesh)
■ Versioned code & conﬁguration (revision)

What is love ?
■ based on Kubernetes (shorthand: K8s) ✓
■ easy to install (CNAB FTW)
■ easy to scale (via Knative serving built-in autoscaling, inc. scale-{to,from}-zero) ✓
■ with polyglot function support (build sources via Knative build and buildpacks v3) ✓

Installation via riﬀ CNAB
CNAB?
Cloud Native Application Bundle
■ Standard for packaging multi-component
applications
■ Target environment-agnostic
■ Invocation image can use Helm, KAB etc
■ Bundle can be thin or thick
cnab.io

Installation via riﬀ CNAB
The bundle includes
■ Knative serving and build
■ Istio (Envoy) service mesh
■ riﬀ custom resources and controllers
It does not include
■ A K8s cluster

What is love ?
■ easy to install (CNAB FTW) ✓

Function deployment
Function?
■ A custom resource to describe the
(Repo URL)→Docker image
transformation on the cluster a.k.a. build
■ Orchestrated by the buildpack
builder
■ Invokable in:
○ Request-reply mode (handler)
○ Streaming fashion (processor)
const os = require('os');
const hostname = os.hostname();
module.exports = name => {
console.log(`received request to ${hostname} for ${name}`);
return `hello ${name} from ${hostname}`
};

Streaming function (pre-α)
Streaming
■ Heavy lifting done by Spring Cloud Fn
■ Streaming processor and gateway
(Liiklus) abstract the underlying msg
system
■ ⚠ Only Java supported at this point
(broader support soon)
Fn Invoker Processor
Gateway
1
Gateway
2
Kafka
topic1
Kinesis
topic2

What is love ?
■ easy to install (CNAB FTW) ✓
■ with emergent stateful streaming support ✓
■ and an overall improved User eXperience in mind ✓

Useful resources
riff resources
Documentation: https://projectriff.io
CNAB bundle: https://github.com/projectriff/cnab-riff
System: https://github.com/projectriff/system
Buildpack builder: https://github.com/projectriff/builder/
CLI: https://github.com/projectriff/cli/
PFS: https://pivotal.io/platform/pivotal-function-service
Twitter: https://twitter.com/projectriff
General resources
CNAB: https://cnab.io/
Cloud Native Buildpacks v3: https://buildpacks.io/
Kubernetes: https://kubernetes.io
Knative: https://cloud.google.com/knative/
Presentation resources
Demo repo: https://github.com/fbiville/riff-demos

Function as a Service with Knative and riff

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