How to get started developing Camel microservices (or any Java technology for that matter) on a local Kubernetes cluster from zero to deployment. As a Java developer it may be daunting to know how to get started how to develop container applications that runs on Kubernetes cluster. Using minikube its very easy to run a local cluster and with the help of fabric8 tooling its even easier to install and run using familiar tools like Maven. In this talk we will build a set of Apache Camel and Java based Microservices that uses Spring Boot and WildFly Swarm. With the help of fabric8 maven tooling you will see how to build, deploy, and run your Java projects on a Kubernetes cluster (local or remote). And even live debugging is easy to do as well. We will discuss practices how to build distributed and fault tolerant microservices using technologies such as Kubernetes Services, Netflix Hysterix, and Camel EIP patterns for fault tolerance. In the talk you will also hear about related open source projects where you can go explore more such as fabric8, openshift.io, istio, etc. This presentation is a 50/50 mix between slides and demo.

1. Containerised Integration
with
Apache Camel
August 2017Claus Ibsen @davsclaus
.. or any kind of Java application

2. In 2002 at Aussie Rules

3. In 2002 on the top

4. In 2002 I walked 1 lap

5. In 2017 I ran 5 laps

6. Camel vs F1
Camel
2017
F1
2017
Lap Distance 5.3 km 5.3 km
Best Lap Time 23m36s 1m26s
Total Laps 5 57
Total Distance 26 km 307 km
Total Time 2h3m 1h24m

7. Claus Ibsen
• Senior Principal Software
Engineer at Red Hat
• Apache Camel
8½ years working with Camel
• Author of
Camel in Action books
@davsclaus
davsclaus
www.davsclaus.com
cibsen@redhat.com

8. Key Message

9. Key Message

10. Key Message
?

11. Key Message
?
?
or

12. Tip of Iceberg

13. Running Local
OpenShift / Kubernetes
• MiniShift
• OpenShift CDK
• MiniKube (Kubernetes)

14. Running Kubernetes
Locally
• Download MiniKube
https://github.com/kubernetes/minikube
• Install kubectl
• Start MiniKube
minikube start
https://kubernetes.io/docs/tasks/tools/install-minikube/

15. Running OpenShift
Locally
• Download MiniShift
https://github.com/minishift/minishift/releases
• Start MiniShift
minishift start
https://www.openshift.org/minishift/

16. How I installed
OpenShift locally

17. Build a
Camel Demo
Time

18. Source Code & Slides
https://github.com/davsclaus/minishift-hello

19. Hello Service
Hello
Service
Client

20. Hello Service
Hello
Service
Swarm says hello from $HOSTNAME
Client

21. Implementation
Client Hello Service
HTTP
WildFy
Swarm
Spring Boot WildFly Swarm

22. Implementation
Hello
Service
Client Hello Service
HTTP

23. Implementation
Client Hello Service
HTTP
from timer
to http4
log
from undertow
transform
helloservice

24. WildFly Swarm
Generator

25. Hello Service

26. Hello Service

27. Spring Boot Starter

28. Client

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

30. Fabric8 Maven Plugin
Maven
Project
Fabric8
Maven Plugin
Docker
Image
build
https://maven.fabric8.io

31. https://maven.fabric8.io
Fabric8 Maven Plugin

32. Build Docker Image
mvn fabric8:build
OpenShift
S2I Build

33. Our Demo
Client Hello Service
http://localhost:8080
from timer
to http4
log
from undertow
transform
helloservice

34. Static vs Dynamic Platform
Client Hello Service
from timer
to http4
log
from undertow
transform
helloservice
Hardcoded
hostname and port
http://localhost:8080

35. Dynamic Platform
Hello ServiceClient
from timer
to http4
log
from undertow
transform
helloservice
Expose as
Kubernetes
Service

36. Dynamic Platform
Client
helloservice
pod
pod
Hello Service

37. Dynamic Platform
Client
helloservice
pod
helloservice
pod
pod
Hello Service

38. Dynamic Platform
Client
helloservice
pod
helloservice
pod
Service
pod
Hello Service

39. Dynamic Platform
Client
helloservice
pod
helloservice
pod
Service
IP:Port
pod
Hello Service
Static

40. Dynamic Platform
Client
helloservice
pod
helloservice
pod
Service
IP:Port
pod
Hello Service
Static
Dynamic
Dynamic
Dynamic

41. Kubernetes Service
from user point of view
service ip:port
from timer
to http4
log
pod
from undertow
transform
helloservice
pod

42. Using Kubernetes
Service
Client
from timer
to http4
log
We want to use hello service
How do we do that?

43. Using Kubernetes
Service
• Environment Variables
• Hostname
• Port
Client
from timer
to http4
log
Service Discovery using DNS is also available

44. Service using ENV
• {{service:name}} Client
from timer
to http4
log

45. Service using DNS
• servicename:port Client
from timer
to http4
log

46. Ready to run in OpenShift
Client Hello Service
{{service:helloswarm}}
from timer
to http4
log
from undertow
transform
helloservice

47. How to deploy to OpenShift?
Maven Project

48. How to deploy to OpenShift?
Maven Project
fabric8 Maven
Plugin
deploy

49. Deploy - Hello Service
• mvn fabric8:deploy
Hello Service
from undertow
transform
helloservice

50. Deploy - Client
• mvn fabric8:deploy Client
from timer
to http4
log

51. Run - Client
• mvn fabric8:run Client
from timer
to http4
log
Runs in foreground, tail log,
undeploys when ctrl + c

52. Ready to run in OpenShift

53. • Change deployment replicas
Scaling

54. Scaling
• Service load balancing
Load balancing
is random

55. Error Handling
• Client Side Retry
service ip:port
from timer
to http4
log
pod
from undertow
transform
helloservice
pod
service ip:port
service ip:port
service ip:port

56. Error Handling
• Client Side Retry

57. Error Handling
• Client Side Retry
Figure by Christian Posta
Thundering Herd
Problem

58. Error Handling
• Client Side Circuit Breaker with Hystrix

59. Error Handling
• Client Side Circuit Breaker with Hystrix

60. Hystrix Dashboard
Instructions in readme how to
install and use

61. Hystrix Demo

62. Debugging
• Debugging Pods
mvn fabric8:debug

63. Remote Debug
Port 5005

64. Remote Debug
Breakpoint hit

65. • minishift openshift service helloswarm -n myproject
Access Service
from your computer
Name of project
(namespace)

66. Tip of Iceberg
Figure by Bilgin Ibryam

67. Service Mesh
http://philcalcado.com/2017/08/03/pattern_service_mesh.html

68. Service Mesh
http://philcalcado.com/2017/08/03/pattern_service_mesh.html

69. Service Mesh Projects
Istio

70. Upcoming Webinar
August 17th
https://developers.redhat.com/devnationlive

71. Free Books
http://developers.redhat.com/promotions/microservices-for-
java-developers/

72. Free Books
https://www.openshift.com/promotions/for-developers.html

73. Free Books
https://www.openshift.com/promotions/devops-with-
openshift.html

74. Not so free Book
coupon code:
redhatcamel
https://www.manning.com/books/ibsen2