Apache Camel has fundamentally changed the way enterprise Java developers think about system-to-system integration by making enterprise integration patterns (EIP) a simple declaration in a lightweight application wrapped and delivered as a single JAR. In this session, we’ll show you how to bring the best practices from the EIP world together with containers, running on top of Kubernetes, and deployed as Spring Boot microservices, which are both cloud-native and cloud-portable. Building and designing cloud-native microservices impacts how we develop. We’ll discuss practices how to build distributed and fault-tolerant microservices with technologies such as Kubernetes Services, Netflix Hystrix, Camel EIP patterns, and Istio. You will see live demos of us killing containers to test fault tolerance, and more.

1. Camel microservices
with Spring Boot
and Kubernetes
JEEConf
May 2018
Claus Ibsen
@davsclaus

2. I was last here at JEEConf in 2011

3. About me
● Senior Principal Software Engineer at Red Hat
● 10 years as Apache Camel committer
● Author of Camel in Action books
● Based in Denmark Blog: http://www.davsclaus.com
Twitter: @davsclaus
Linkedin: davsclaus

4. System Integration

5. Integration Framework

6. PATTERN BASED INTEGRATION
200+
COMPONENTS
Batch, messaging,
web services, cloud,
APIs, and more ...
BUILT-IN DATA
TRANSFORMATION
JSON, XML, HL7,
YAML, SOAP, Java,
CSV, and more ...
INTUITIVE
ROUTING
Develop
integrations quickly
in Java or XML.
ENTERPRISE
INTEGRATION
PATTERNS
Build integrations
using enterprise best
practices.
Create, connect,
and compose APIs
with ease.
NATIVE REST
SUPPORT
Apache Camel, a powerful pattern-based integration engine with a comprehensive
set of connectors and data formats to tackle any integration problem.

7. Enterprise Integration Patterns

8. Enterprise Integration Patterns

9. Camel Routes
from("file:data/inbox")
.to("jms:queue:order");
<route>
<from uri="file:data/inbox"/>
<to uri="jms:queue:order"/>
</route>
Java DSL
XML DSL

10. Camel Routes with Splitter

11. Camel Routes with Splitter
from("file:inbox")

12. Camel Routes with Splitter
from("file:inbox")
.split(body().tokenize("n"))

13. Camel Routes with Splitter
from("file:inbox")
.split(body().tokenize("n"))
.marshal(customToXml)
Custom data
transformation

14. Camel Routes with Splitter
from("file:inbox")
.split(body().tokenize("n"))
.marshal(customToXml)
.to("activemq:line"); Custom data
transformation

15. Camel Architecture

16. Camel runs everywhere
Application
Servers
Linux
Containers

17. Camel connects everything
Enterprise
Systems
● File
● FTP
● JMS
● AMQP
● JDBC
● SQL
● TCP/UDP
● Mail
● HDFS
● JPA
● MongoDB
● Kafka
● ...
Public Cloud
● AWS
○ S3
○ SQS
○ Kinesis
○ ...
● Google
○ BigQuery
○ PubSub
● Azure
○ Blob
○ Queue
● Box
● Dropbox
● Facebook
● Linkedin
● Salesforce
● SAP
● ServiceNowIoT
● CoAP
● MQTT
● PubNub
SaaS

19. +

20. +
+

21. +
+
+

22. +
+
+
=

23. What about Camel
in the Cloud?

24. Monolith
MyApp
Slides by @burrsutter

25. Microservices

26. Microservices

27. Microservices

28. Microservices

29. Microservices

30. Microservices

31. Network of Services

32. Container
JVM
Service C
Microservices == Distributed Computing
Container
JVM
Service B
Container
JVM
Service A

33. MyService
Monitoring
Tracing
API
Discovery
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity
Microservices'ilities

35. MyService
Monitoring
Tracing
API
Discovery
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity
Microservices'ilities
+ Kubernetes

36. MyService
Monitoring
Tracing
API
Discovery
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity
Microservices'ilities
+ PaaS

37. MyService
Monitoring
Tracing
API
Discovery
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity
Microservices'ilities
+ Istio

38. MyService
Monitoring
Tracing
API
Discovery
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity
Microservices'ilities
+ API management

39. MyService
Monitoring
Tracing
API
Discovery
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity
But where is Camel?

40. MyService
Monitoring
Tracing
API
Discovery
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity
But where is Camel?
embedded in
your (Java)
services

41. Container
JVM
Service C
Microservices == Distributed Integration
Container
JVM
Service B
Container
JVM
Service A

42. Container
JVM
Service C
Microservices == Distributed Integration
Container
JVM
Service B
Container
JVM
Service A
External
Systems

43. 43
THE THREE PILLARS OF AGILE INTEGRATION
Key foundational capabilities needed by today’s enterprises
DISTRIBUTED
INTEGRATION
-LIGHTWEIGHT
-PATTERN BASED
-EVENT ORIENTED
-COMMUNITY SOURCED
CONTAINERS
- CLOUD NATIVE SOLUTIONS
-LEARN ARTIFACTS,
INDIVIDUALLY DEPLOYABLE
- CONTAINER BASED SCALING
AND HIGH AVAILABILITY
APIs
-WELL DEFINED, REUSABLE,
AND WELL MANAGED
END-POINTS
-ECOSYSTEM LEVERAGE
FLEXIBILITY SCALABILITY RE-USABILITY

44. Camel in the Cloud

45. Best Practice - Small in Size
● Camel is light-weight
○ (camel-core 4mb)
○ + what you need
● Single fat-jar via:

46. Best Practice - Stateless
● Favour stateless applications
● If state is needed:
○ Data-grid
■ camel-infinispan
■ camel-hazelcast
■ camel-ignite
■ ...
○ Storage
■ camel-sql
■ camel-jpa
■ camel-kafka
■ ...
○ Kubernetes
■ Stateful-set

47. ● Kubernetes ConfigMap
○ Inject via ENV
○ Inject via files
● Kubernetes Secrets
○ Inject via ENV
○ Inject via files
Best Practice - Configuration Management
$ kubectl get cm -o yaml my-configmap
apiVersion: v1
data:
fallback: I still got no response
kind: ConfigMap

48. Best Practice - Fault Tolerant
● Camel Retry
○ onException
○ errorHandler
● Camel Hystrix
○ circuit breaker

49. Best Practice - Fault Tolerant
● Camel Retry
○ onException
○ errorHandler

50. Best Practice - Fault Tolerant
● Camel Retry
○ onException
○ errorHandler
Thundering Herd
Problem

51. Best Practice - Health Checks
● Health Checks
○ camel-spring-boot actuator
○ wildfly-swarm monitor
● Readiness Probe
○ Kubernetes
● Liveness Probe
○ Kubernetes

52. ● Works anywhere
Best Practice - EIP Patterns

53. EIP Cloud Patterns Service Call
from("timer")
.serviceCall("hello-service");
Plugins
● Consul
● Etcd
● Kubernetes
● Ribbon
● Zookeeper

54. EIP Cloud Patterns Hystrix EIP
from("timer:foo")
.hystrix()
.to("http:myservice")
.onFallback()
.to("bean:myfallback")
.end()

55. EIP Cloud Patterns
rest().post("train/buy/seat")
.saga()
.compensation("direct:cancel")
...
.to("http:trainservice/buy")
Saga EIP

56. EIP Cloud Patterns Distributed
Tracing

57. MyService
Monitoring
Tracing
API
Discovery
Invocation
Resilience
Pipeline
Authentication
Logging Elasticity
Usable Camel capabilities
Camel Retry
Camel Hystrix
Camel Zipkin
Camel OpenTracing
Camel Rest
Camel
Components

58. Demo Time

59. Basic Demo

60. Tip of the iceberg
Figure by Bilgin Ibryam

61. Free book
http://developers.redhat.com/promotions/microservices-for-java-developers

62. Not so free book
https://www.manning.com/books/kubernetes-in-action

63. Not so free book
● Discount code (39%):
camel39
(ordering from Manning)
https://www.manning.com/books/camel-in-action-second-edition

64. More Information
● Slides and Demo source code:
https://github.com/davsclaus/camel-riders-in-the-cloud
● Apache Camel website:
http://camel.apache.org
● Best "What is Apache Camel" article:
https://dzone.com/articles/open-source-integration-apache
● My blog:
http://www.davsclaus.com
● DevNation Webinars:
https://developers.redhat.com/devnationlive

65. Q & A