supersonic subatomic integrations
on Kubernetes and Knative

Peter Palaga

@ppalaga

Peter Palaga

Agenda

• Apache Camel intro
• Apache Camel Quarkus
• Apache Camel K

What is Apache Camel?

Since 2007

Huge community

• ~500 contributors
• ~2900 stars on Github
• ~3700 forks on Github
• ~1000 subscribers on the Users mailing list
• ~9000 questions on StackOverFlow

Follow @ApacheCamel (new) on Twitter!

An integration library

Enterprise Integration Patterns (EIP)

integrate anything

through its

~300 components

Domain Specific Languages (DSL)

class MyCamelRouter extends RouteBuilder {
  @Override
  public void configure() throws Exception {
    from("twitter-search:"
        + "word1,word2")
      .log("Got a tweet: ${body}")
      .to("telegram:bots");
  }
}

<routes
  xmlns="http://camel.apache.org/schema/spring">
  <route id="my-route">
    <from uri="twitter-search:word1,word2"/>
    <log message="Got a tweet: ${body}"/>
    <to uri="telegram:bots"/>
  </route>
</routes>

Groovy, Scala, Kotlin, ...

Runnable on

Spring Boot
Standalone

Apache Camel 3

What is

?

Supersonic, subatomic Java!

Why do we need
Quarkus in Camel?

• Java sucks in containers
• Serverless functions need fast startup

Camel Quarkus

• Started about a year ago inside Quarkus
• Now https://github.com/apache/camel-quarkus
• 34 components supported
• Soon on code.quarkus.io

Camel Quarkus Demo

Apache Camel K

Motivations

• Low code/no code integrations: Syndesis
• A "glue" for Serverless Functions (read: Knative)

New areas of interest

• Low code/no code integrations: Syndesis
• A "glue" for Serverless Functions (read: Knative)

Camel K demo

Camel K internals

• kamel client side binary
  • github.com/apache/camel-k/releases
• Camel K Operator

What is Kubernetes Operator?

• An Application Management concept
• Does what a human operator would have to do
  • Based on declarative input
    
    
• A pattern
• (Ex-)CoreOS Operator Framework

How it works

A running container

• Monitors the cluster via Kubernetes API
• Reacts:
  • Add/remove/modify resources (pods/services/custom CRDs)
  • Scale up/down
  • Call endpoints of the running applications
• Implements custom logic

Custom Resource Definitions (CRD)

Camel K Operator

Image resolution (1/2)

Collect Maven dependencies based on

• DSL used (Groovy, XML, Java, Kotlin, JavaScript, YAML)
• Camel components used in the routes

Image resolution (2/2)

• Based on the found dependency set
  • Either take an available Image (buildless deploy)
  • Or build a new image


• Route definition not a part of the image
  • Mounted to the container as a ConfigMap

Camel K on Knative

What is Knative?

• Building blocks for Serverless applications
• CRDs and operators

https://knative.dev

Knative Serving (1/2)

Knative Serving (2/2)

Knative Serving (2/2)

Knative Serving (2/2)

Knative Eventing

Event Consumer

Event Consumer

Event Consumer

Event Consumer

Event Consumer

Event Source

Roles in Knative Eventing

What comes next

• Camel K 1.0.0 after Knative 1.0 and Camel 3.0.0 GA
• Quarkus as integration runtime
• Tekton builds
• BDD testing
• IDE plugins

• https://camel.apache.org
• Chat: https://gitter.im/apache/camel
• Mailing list: dev@camel.apache.org
• Follow @ApacheCamel