This document discusses microservices with Apache Camel and fabric8 on Kubernetes. It begins with a quick Apache Camel demo of a Twitter search application built with Camel. It then provides an overview of Kubernetes and fabric8, including key concepts like pods, replication controllers, services, and labels. The remainder discusses developing and deploying Java microservices to Kubernetes using Camel, CDI, fabric8, and the OpenShift CLI for tasks like deployment, scaling, and viewing logs.

1. Microservices
with
Apache Camel & fabric8
on Kubernetes
Claus Ibsen
@davsclaus
davsclaus
davsclaus.com

2. I was here in 2011

3. Claus Ibsen
• Principal Software Engineer
at Red Hat
• Apache Camel
8 years working with Camel
• Author of
Camel in Action books
@davsclaus
davsclaus
davsclaus.com

4. Agenda
• Quick Apache Camel Demo
• Kubernetes and fabric8
• Java Microservices with Kubernetes
• More Information

5. Twitter Example
• Twitter search w/ keyword
• Live update web page

6. Twitter Example

7. Twitter Example
• camel-core
• camel-twitter
• 2 java classes
• 1 html page
• 1 maven pom.xml

8. Main
Class

9. Camel Route

10. Camel Route (cont.)

11. html

12. pom.xml

13. Agenda
• Quick Apache Camel Demo
• Kubernetes and fabric8
• Java Microservice with Kubernetes
• More Information

17. ?

18. ?

19. OS Level Virtualisation
Docker Orchestration
PaaS Platform on top of
Kubernetes
Services and Tools for
Kubernetes and OpenShift

20. kubernetes

21. Kubernetes
‣ Open Source orchestration platform for Docker
containers
• Rewrite of Google’s internal framework “Borg”
‣ Declarative specification of a desired state
‣ Self-healing
‣ Service discovery
‣ Scheduling across hosts
‣ Replication

22. Architecture

23. Concepts
‣Pods
• Collection of one or more Docker containers
‣Replication Controller
• Creates and takes care of Pods
‣Services
• Proxy for a collection of Pods
‣Labels
• Grouping and organization of Objects
‣Namespaces
• Virtual clusters backend by same physical cluster

24. Pod
‣ Collection of Docker containers running on the same
host.
‣ Pods have unique IPs
‣ Containers in a Pod ….
• …. share the same IP address
• …. can reach each other via local ports
• …. can share data via volumes
‣ Pods can have one or more Labels

25. Replication Controller
‣ Controls Pods selected by Labels
‣ Ensures that a specified number of Pod replicas is
running
‣ Holds Pod templates for creating new Pods
‣ Autoscaling
‣ Rolling Updates

26. Service
‣ View on a set of Pods with single
IP address and port
‣ Pods are selected by Label
‣ Services are referenced by
environment variables
‣ Service addresses stay stable
• Pods come and go (with different IPs)

28. fabric8
‣ Tools and Services for value add to Kubernetes and
OpenShift
• Management: console, logging, metrics, dashboards, …
• Continuous Delivery Workflow
• iPaaS: Camel route visualization, API registry, Messaging as
a Service, …
• Tools: Kubernetes/OpenShift build integration, Kubernetes
component test support, CDI extensions
• Quickstarts: Ready to use examples, also available as
Maven archetypes

29. Agenda
• Apache Camel Introduction
• Kubernetes and fabric8
• Java Microservices with Kubernetes
• More Information

30. Hello Service
Hello
Service

31. Hello Service
Hello
Service
name=Claus
Hello Claus how are you today?

32. Implementation
Hello
Service
Camel CDI Apache Tomcat
HTTP

33. Implementation
Camel CDI Apache Tomcat
HTTP
from timer
to http
to log
from servlet
transform
helloservice

34. Apache Tomcat

35. Camel CDI

36. CounterBean

37. Ready to run local
Camel CDI Apache Tomcat
HTTP 8080
from timer
to netty
to log
from servlet
transform
helloservice

38. How to build Docker Image?
Maven Project Docker Image

39. Docker Maven Plugin
Maven Project
Docker Maven
Plugin
Docker Image
build

40. Docker Maven Plugin
in pom.xml

41. Build Docker Image
mvn clean install docker:build

42. Local Docker Repository
Apache
Tomcat
Camel
CDI

43. Our Demo
Camel CDI Apache Tomcat
HTTP 8080
from timer
to http
to log
from servlet
transform
helloservice

44. Static vs Dynamic Platform
Camel CDI Apache Tomcat
HTTP 8080
from timer
to http
to log
from servlet
transform
helloservice
Hardcoded
hostname and port

45. Dynamic Platform
Apache Tomcat
HTTP 8080
Camel CDI
from timer
to http
to log
from servlet
transform
helloservice
Kubernetes
Service

46. Kubernetes Service
• Network Connection to one or more Pods
• Own fixed IP address and port

47. Kubernetes
Service
HTTP 8080
from timer
to http
to log
from servlet
transform
helloservice
kubeproxy
Kubernetes
Master
enlisted on deployment
changes
pod
node
pod
node

48. Kubernetes Service
from user point of view
service ip:port
from timer
to http
to log
from servlet
transform
helloservice
pod pod

49. Service defined
in pom.xml
Apache Tomcat
from servlet
transform
helloservice
Container Port =
Inside
Service Port = Outside

50. Using Kubernetes
Service
Camel CDI
from timer
to http
to log
We want to use hello service
How do we do that?

51. Using Kubernetes
Service
• Environment Variables
• Hostname
• Port
Camel CDI
from timer
to http
to log
Service Discovery using DNS is available
in newer versions of Kubernetes.

52. Camel using service
• Use {{service:hello}} Camel CDI
from timer
to http
to log

53. Ready to run in Kubernetes
Camel CDI Apache Tomcat
service:hello
from timer
to netty
to log
from servlet
transform
helloservice
kubeproxy

54. How to deploy to
Kubernetes?
Maven Project

55. How to deploy to
Kubernetes?
Maven Project
fabric8 Maven
Plugin
apply

56. Deploy - myweb
Apache Tomcat
from servlet
transform
helloservice
• mvn -Pf8-local-deploy

57. Deploy - mycdi
• mvn -Pf8-local-deploy Camel CDI
from timer
to http
to log

58. fabric8 web console

59. OpenShift CLI
• oc get pods
You can also use CLI from
docker
kubernetes

60. OpenShift CLI
• oc get services

61. OpenShift CLI
• oc logs -f <pod name>

62. OpenShift CLI
• oc get routes

63. Scaling
• Change replication controller replicas

64. Scaling
• Service load balancing
Load balancing is random
in newer version of
Kubernetes

65. Agenda
• Quick Apache Camel Demo
• Kubernetes and fabric8
• Java Microservices with Kubernetes
• More Information

66. Links
• What is Apache Camel
• http://java.dzone.com/articles/open-source-
integration-apache
• hawtio
• http://hawt.io
• fabric8
• http://fabric8.io
@davsclaus
davsclaus
davsclaus.com