1.
Serverless Integration
with
Knative & Apache Camel
on Kubernetes
Claus Ibsen
@davsclaus

2.
About me
● Senior Principal Software Engineer at Red Hat
● Java Champion
● 11 years as Apache Camel committer
● Author of Camel in Action books
🌍 http://www.davsclaus.com
@davsclaus
davsclaus
✉️ claus.ibsen@gmail.com

3.
● The swiss knife of integration
● >10 years of development - still one of the most active Apache
projects
● Java-based integration framework that can be installed on multiple
runtimes: Spring-Boot, JEE, JBoss, Karaf, Standalone, ...
● Based on Enterprise Integration Patterns
● Supports 250+ components
● Uses a powerful DSL
● Can integrate anything
http://camel.apache.org
What is Apache Camel?

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8.
● A platform for directly running integrations on Openshift and
Kubernetes
● Based on (ex Core OS) operator-sdk
● A community-driven project
● A subproject of Apache Camel started on August 31st, 2018
What is Apache Camel K?
https://github.com/apache/camel-k
K

9.
Overview of Camel K
A lightweight platform for running Camel integration DSL in the cloud.
● Based on operator-sdk
● Works on Openshift and Kubernetes
$ kamel run routes.groovy
from(“telegram:bots/bot-id”)
.transform()...
.to(“kafka:topic”);
from(“kafka:topic”)
.to(“http:my-host/api/path”);
File routes.groovy

10.
Architecture of Camel K
Dev Environment Remote Cloud
kamel CLI
Camel K
Operator
“Integration”
Custom
Resource
Running Pod
Live updates!
Fast redeploy!
Less than 1 second!
Tailored for cloud-native development experience

11.
Camel K in details
kind: Integration
apiVersion: camel.apache.org/v1alpha1
metadata:
name: my-integration
spec:
sources:
- name: source.groovy
content: |-
from(“telegram:...”)
.transform()...
.to(“kafka:...”)
from(“telegram:bots/bot-id”)
.transform()...
.to(“kafka:topic”);
from(“kafka:topic”)
.to(“http:my-host/api/path”);
This is what people care
about: Camel DSL
Camel K Operator
1. Choose a runtime
2. Create container image
3. Create Kubernetes
resources for deployment
kamel CLI

12.
Camel K Resources Visualization
$ kamel run code.groovyfrom(“telegram:bots/bot-id”)
.transform()...
.to(“kafka:topic”);
from(“kafka:topic”)
.to(“http:my-host/api/path”);
File code.groovy
<<custom-resource>>
IntegrationPlatform
<<custom-resource>>
IntegrationContext
<<custom-resource>>
Integration
from(“telegram:..”)
.to(“...”)
BuildConfig
ImageStream
ImageStreamTag
Deployment
ConfigMap
from(“telegram:..”)
.to(“...”)
Pod
On OpenShift.
It uses Kaniko on
“vanilla” Kubernetes.
CRDs allow to abstract
from all this implementation
details!

13.
Camel K Resources Visualization
$ kamel run code.groovyfrom(“telegram:bots/bot-id”)
.transform()...
.to(“kafka:topic”);
from(“kafka:topic”)
.to(“http:my-host/api/path”);
File code.groovy
<<custom-resource>>
IntegrationPlatform
<<custom-resource>>
IntegrationContext
<<custom-resource>>
Integration
from(“telegram:..”)
.to(“...”)
BuildConfig
ImageStream
ImageStreamTag
Deployment
ConfigMap
from(“telegram:..”)
.to(“...”)
Pod
On OpenShift.
It uses Kaniko on
“vanilla” Kubernetes.

14.
Fast Deployment of Camel K
Time to run a integration using different strategies (in seconds)
Lower is better
😃
F-m-p is the “fabric8-maven-plugin”
(http://maven.fabric8.io/) deploying a
average spring-boot based
integration on Minishift vs. a remote
OpenShift cluster (accounting time
to upload the fat Jar). Source S2I
build has been measured in Red Hat
Fuse Online.

15.
Can you implement Serverless without
functions ?

16.
“Serverless computing refers to the concept of building and running applications
that do not require server management. It describes a finer-grained deployment
model where applications, bundled as one or more functions, are uploaded to a
platform and then executed, scaled, and billed in response to the exact demand
needed at the moment”
Source: https://www.cncf.io/blog/2018/02/14/cncf-takes-first-step-towards-serverless-computing/
What is serverless again… ?

17.
What is Knative ?

18.
Build
A pluggable model for
building artifacts, like jar
files, zips or containers
from source code.
Knative Overview - Components
Serving
An event-driven model
that serves the container
with your application and
can "scale to zero".
Eventing
Common infrastructure for
consuming and producing
events that will stimulate
applications.
"...an extension to Kubernetes exposing building blocks to build modern, source-centric, and container-
based applications that can run anywhere".

19.
Knative Overview - Builds
● A Build is a list of containers run in-order, with source mounted in (TaskRun)
● BuildTemplates provide reusable, parameterized recipes that can be used to
create Builds (Task)
● Pipelines - The future!
○ Group of Tasks
● Build Example
● "Source to URL"
● S2I for OpenShift users
apiVersion: build.knative.dev/v1alpha1
kind: Build
metadata:
name: example-build
spec:
serviceAccountName: build-auth-example
source:
git:
url: https://github.com/example/build-example.git
revision: master
steps:
- name: centos-example
image: centos
args: ["centos-build-example", "SECRETS-example.md"]
steps:
- image: quay.io/example-builders/build-example
args: ['echo', 'hello-example', 'build']

20.
Knative Overview - Serving
● Configurations represent the ‘floating
HEAD’ of a history of Revisions
● Revisions represent immutable snapshot
of code and configuration
● Routes configure ingress over a collection
of Revisions and/or Configurations
● Services (nope, not K8s services) are top-
level controllers that manage a set of
Routes and Configurations to implement a
network service
Service
(my-function)
Route
(name) Configuration
Revision
Revision
Revision
manages
records
history of
10%
90%

21.
Knative Overview - Eventing
● Goal is to be a generalized eventing framework
● Many influencers also active on CloudEvents specification
Current-ish API:
● Receive Adapter triggers on EventSources that send Events to a
sink (channel)
● Channels are named endpoints which accept event delivery
(provided by Kafka, AMQP…)
● Subscriptions register to receive traffic from a Channel

22.
Knative Eventing - Pipeline
Knative Eventing Docs

23.
Knative Eventing - Flow
Knative Eventing Docs

24.
Again, beyond functions...
Keep code and configuration separate
Each configuration change triggers the creation
of new revision
Concurrency (scale out via process)
Disposability (fast startup/graceful shutdown)
Build, release, run (separate build and run stages)
https://12factor.net/
Configuration(configuration.serving.knative.dev)
Revision(revision.serving.knative.dev)
Route(route.serving.knative.dev)
Service(service.serving.knative.dev)
Build (buildtemplate.build.knative.dev)

25.
What about Camel K & Knative ?
K

26.
Camel K and Knative
<<custom-resource>>
Build
Knative building blocks relevance to Camel
<<custom-resource>>
...<<custom-resource>>
...<<custom-resource>>
...
Knative Build
<<custom-resource>>
Service
<<custom-resource>>
...<<custom-resource>>
...<<custom-resource>>
...
Knative Serving
<<custom-resource>>
...<<custom-resource>>
...<<custom-resource>>
...
Knative
Eventing
Standardize building container images Auto-scaling and scale-to-zero Messaging for event-based applications
<<custom-resource>>
Channel
X

27.
Camel K and Knative
<<custom-resource>>
Build
Knative building blocks relevance to Camel
<<custom-resource>>
...<<custom-resource>>
...<<custom-resource>>
...
Knative Build
<<custom-resource>>
Service
<<custom-resource>>
...<<custom-resource>>
...<<custom-resource>>
...
Knative Serving
<<custom-resource>>
...<<custom-resource>>
...<<custom-resource>>
...
Knative
Eventing
Standardize building container images Auto-scaling and scale-to-zero Messaging for event-based applications
<<custom-resource>>
Channel
X

28.
Camel K and Knative
<<custom-resource>>
Build
Knative building blocks relevance to Camel
<<custom-resource>>
...<<custom-resource>>
...<<custom-resource>>
...
Knative Build
<<custom-resource>>
Service
<<custom-resource>>
...<<custom-resource>>
...<<custom-resource>>
...
Knative Serving
<<custom-resource>>
...<<custom-resource>>
...<<custom-resource>>
...
Knative
Eventing
Standardize building container images Auto-scaling and scale-to-zero Messaging for event-based applications
<<custom-resource>>
Channel
X

29.
Camel & Knative in details
kind: Integration
apiVersion: camel.apache.org/v1alpha1
metadata:
name: my-integration
spec:
sources:
- name: source.groovy
content: |-
from(“knative:channel/a”)
.to(“http:my-host/api/path”)
from(“knative:channel/a”)
.to(“http:my-host/api/path”);
Camel K Operator
Knative
profile?
kind: Service
apiVersion: serving.knative.dev/v1alpha1
yes
kind: Deployment
# standard one
no

30.
Camel & Knative in details
$ kamel run code.groovy
from(“knative:channel/a”)
.transform()...
.to(“slack:#room”);
File code.groovy
<<custom-resource>>
Integration
from(“knative:channel/a”)
.to(“...”) <<custom-resource>>
Service
<<custom-resource>>
Channel
<<custom-resource>>
Subscription Pod Pod Pod
events
Same user experience!
Or even no pods!
In the knative profile, the
operator uses Knative
building blocks instead of a
standard Kubernetes
“Deployment”

31.
Camel K: same model for different purposes
Camel K & Knative Eventing
Channel
Channel
Channel
Ext
System
Event
Source
EIP
Integration
Function
250+ Camel
components!

32.
● Apache Camel K
https://github.com/apache/camel-k
● Camel K Introduction Blog
https://www.nicolaferraro.me/2018/10/15/introducing-camel-k
● Camel K and Knative tutorial
https://redhat-developer-demos.github.io/knative-tutorial/knative-
tutorial-camelk/v1.0.0/index.html
● Camel K and Knative video
https://www.youtube.com/watch?v=btf_e2GniXM
● Camel Knative Event Sources
https://github.com/knative/eventing-
sources/tree/master/contrib/camel/samples
Camel K & Knative links

33.
Java Density Problem
CONTAINER ORCHESTRATION
Node Node Node
Traditional Cloud-Native
Java Stack
Traditional Cloud-Native
Java Stack
Traditional Cloud-Native
Java Stack
Traditional Cloud-Native
Java Stack
NodeJS
NodeJS
NodeJS
NodeJS
NodeJS
NodeJS
NodeJS
Go Go Go
Go Go Go
Go Go Go
Go Go Go
Go Go Go
Go Go Go
Go Go Go
https://developers.redhat.com/blog/2017/03/14/java-inside-docker/

34.
SCALE-UP SCALE-DOWN SCALE-TO-
ZERO
Java Fast Scaling Problem

35.
Supersonic Subatomic Java
https://quarkus.io

36.
What is Quarkus
A Kubernetes Native Java stack tailored for
GraalVM & OpenJDK HotSpot, crafted from the
best of breed Java libraries and standards

37.
Minimal Footprint - Quarkus
● Minimal footprint Java applications
○ Native vs Quarkus+OpenJDK JVM vs Traditional JVM

38.
Container First - Quakrus
● First Class Support for Graal/SubstrateVM
○ Native compiled first-class supported
● Build Time Metadata Processing
○ Pre-Build and "warump" as much as possible during build time
● Reduction in Reflection Usage
○ Reduce startup and memory
● Native Image Pre Boot
○ Most of startup serialized into native image to startup even faster
https://quarkus.io/vision/container-first

39.
Apache Camel and Quarkus runs blazingly fast 🚀 with native compiled binaries.
Startup is 7 msec, 28mb binary file, and 15mb RSS memory used.

40.
Camel and Quarkus - Links
● Quarkus
https://quarkus.io
● Quarkus Camel Extensions
https://quarkus.io/extensions/#integration
https://github.com/quarkusio/quarkus/tree/master/extensions/camel
● Quarkus Camel Demo
https://github.com/quarkusio/quarkus-quickstarts/tree/master/camel-java

41.
Where are the slides ?
https://www.slideshare.net/davsclaus

42.
Any Questions ?
🌍 http://www.davsclaus.com
@davsclaus
davsclaus
✉️ claus.ibsen@gmail.com