riffing on Knative by Scott Andrews at SpringOne Tour 2019

1. riffing on Knative
Scott Andrews
@scothis

2. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
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looking information in this presentation.
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3. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Disclaimer
everything is alpha
Have fun(ctions), but not in production

4. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Demo driven talk
• Kubernetes primer
• Serverless Kubernetes with Knative
• Building and deploying a riff Function from source
• Java
• Node.js
• commands
• Invoking a riff Function
• command driven functions
• event driven functions
Overview
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5. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Tools we’ll use
• riff - riff is for functions
https://github.com/projectriff/riff/releases
• kubectl - Kubernetes CLI
https://kubernetes.io/docs/tasks/tools/install-kubectl/
• kail - kubernetes tail
https://github.com/boz/kail
• watch - execute a program periodically, showing output fullscreen
https://gitlab.com/procps-ng/procps
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6. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Demo: Using k8s

7. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
What is riff

8. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Knative
Kubernetes-based platform to build, deploy,
and manage modern serverless workloads
Three core components:
• Build - Source-to-container build orchestration
• Serving - Request-driven compute that can scale to zero
• Eventing - Management and delivery of events
100% open source. Created by Google with contributions from Pivotal and others
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9. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/ 9
BuildTemplate
Source
Channel
Build
Knative Custom Resource Definitions
Subscription
refers to
refers to
creates and
registers
instance of
Eventing
Serving
Build

10. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
riff is for functions
• event driven Function as a Service
• opinionated experience built atop Knative, Kubernetes and Istio
• functions practice Inversion of Control
• no servers, ports or messaging protocols, just your logic
• pick your language runtime:
• Java/Spring
• JavaScript/Node
• executable commands
• more from the community
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11. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
riff on Knative
Community-driven
ecosystem of
Sources,
Channels,
Functions,
Invokers,
BuildTemplates,
etc.
Kubernetes
BuildTemplates
Channels
CLI
Invokers
CLI
Invokers
Build
Topics

12. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Installing riff (and Knative)

13. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Creating a Kubernetes cluster
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# https://projectriff.io/docs/getting-started/gke/
# create cluster
gcloud container clusters create $CLUSTER_NAME
--cluster-version=latest --machine-type=n1-standard-4
--enable-autoscaling --min-nodes=1 --max-nodes=3 --num-nodes=3
--enable-autorepair
--scopes=service-control,service-management,compute-rw,storage-ro,cloud-platform,logging-
write,monitoring-write,pubsub,datastore
# grant yourself cluster-admin
kubectl create clusterrolebinding cluster-admin-binding
--clusterrole=cluster-admin
--user=$(gcloud config get-value core/account)

14. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Install riff
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# https://projectriff.io/docs/getting-started/gke/
# once per cluster
riff system install
# once per namespace
riff namespace init $NAMESPACE --gcr $PATH_TO_GCR_CREDENTIALS

15. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Install riff
...and dependencies including:
• Istio
• Knative Build
• Knative Serving
• Knative Eventing
• In Memory Channel Provisioner
• Kafka, Cloud Pub/Sub, NATSS are also available, but not installed
• riff BuildTemplate - convert source to riff Function container images
• credentials to push builds to an image registry
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16. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Demo: Exploring Knative

17. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/ 17
BuildTemplate
Source
Channel
Build
Knative Custom Resource Definitions
Subscription
refers to
refers to
creates and
registers
instance of
Eventing
Serving
Build

18. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
riff Functions

19. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
a riff Java Function
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// https://github.com/projectriff-samples/fats-uppercase-java
package functions;
import java.util.function.Function;
public class Upper implements Function<String, String> {
public String apply(String s) {
return s.toUpperCase();
}
}

20. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
a riff JavaScript Function
2
0
// https://github.com/projectriff-samples/fats-uppercase-node
module.exports = s => s.toUpperCase();

21. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
a riff Command Function
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# https://github.com/projectriff-samples/fats-uppercase-command
#!/bin/sh
tr '[a-z]' '[A-Z]'

22. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Demo: riff Functions

23. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Deploy a riff Function
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riff function create square
--git-repo https://github.com/projectriff-samples/node-square
--artifact square.js
--verbose
kail -l riff.projectriff.io/function=square -c user-container

24. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke a riff Function
2
4
riff service invoke square --json --
-w 'n'
-d 7

25. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Let’s create another function
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riff function create greet
--git-repo https://github.com/projectriff-samples/command-hello
--artifact greet.sh
riff service invoke greet --text --
-w 'n'
-d "Washington"

26. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Demo: Local Functions

27. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Iterating quickly (in development)
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riff function local run
--local-path ./uppercase
curl localhost:8080
-H 'Content-Type: text/plain'
-w 'n'
-d 'shhh!'

28. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Run on cluster from local source
2
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riff function create uppercase
--local-path ./uppercase
--verbose
riff service invoke uppercase --text --
-w 'n'
-d 'shhh!'

29. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Demo: Event Driven Functions

30. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke a riff Function with events
3
0
riff channel create numbers
riff channel create squares
riff subscription create
--channel numbers
--subscriber square
--reply squares
riff service create correlator
--image scothis/correlator:s1tour

31. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke a riff Function with events
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correlator
numbers
squaressquare
riff invoke /numbers

32. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Demo: Function Chaining

33. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke a riff Function with events
3
3
riff service invoke correlator /s1tour/numbers --json --
-w 'n'
-v
-d 7

34. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke the riff Function with events
3
4
correlator
numbers
replies
squaressquaregreet
riff invoke /numbers

35. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Let’s chain our functions
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riff channel create replies
riff subscription create
--channel squares
--subscriber greet
--reply replies
riff subscription create
--channel replies
--subscriber correlator

36. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke a riff Function with events
3
6
riff service invoke correlator /s1tour/numbers --json --
-H "Knative-Blocking-Request: true"
-w 'n'
-d 7

37. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke the riff Function with events
3
7

38. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke the riff Function with events
3
8

39. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke the riff Function with events
3
9

40. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke the riff Function with events
4
0

41. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke the riff Function with events
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42. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Invoke the riff Function with events
4
2

43. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Other patterns are possible
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correlator
numbers
replies
squaressquaregreet
riff invoke /numbers
dead-beef-00
GET /dead-beef-00

44. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
There's more we didn't have time to show...
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• alternate Eventing Channels
• Kafka
• NATSS
• Google Cloud PubSub
• Eventing Sources
• Cloud Events
• alternate BuildTemplates
• Buildah
• jib
• kaniko
• deploying Knative from source
• Istio
• public DNS
• Autoscaler tuning
• monitoring
• Grafana
• Prometheus
• Zipkin
You can learn more at
https://www.knative.dev

45. Unless otherwise indicated, these slides are © 2013-2018 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license:
http://creativecommons.org/licenses/by-nc/3.0/
Free eBook
http://bit.ly/getting-started-with-knative
Hot off the press

46. > join us at projectriff.io
@projectriff