microservices with apache camel, ddd, and kubernetes

CLOUD NATIVE CAMEL RIDING WITH KUBERNETES AND OPENSHIFT

@christianposta 17 June 2016

Ifchangeishappeningontheoutsidefasterthanontheinsidetheendisinsight.

Jack Welch, former CEO, GE

Company listed on Standard & Poors life expectancy

Do we need “integration?”

What kind of challenges are we going to run into?

Where do Containers fit into this?

WE’RE OFF TO DO MICROSERVICES!

Christian Posta Principal Middleware Architect @ Red Hat

Twitter: @christianposta

Blog: http://blog.christianposta.com

Email: [email protected]

•  “Microservices for Java developers” (6/2016)

•  Committer Apache Camel, ActiveMQ, Fabric8

•  Worked with large Microservices, web-scale,

unicorn company

•  Blogger, speaker about DevOps, integration,

and microservices

•  Single, self-contained, autonomous

•  Isolated and Resilient to faults

•  Faster software delivery •  Own their own data •  Easier to understand

individually •  Scalability •  Right technology for the

problem •  Test individual services •  Individual deployments

MICROSERVICES

Infrastructure for scale

Organizational structure

Identify a useful domain model with boundaries

TRANSFORMATION CHALLENGES

DOMAIN COMPLEXITY IS REAL

•  Break things into smaller, understandable models

•  Surround a model and its “context” with a boundary

•  Implement the model in code or get a new model

•  Explicitly map between different contexts

•  Model transactional boundaries as aggregates

Book checkout / purchase Title Search

Recommendations

Weekly reporting

DO WE NEED INTEGRATON?

•  REST, RPC

•  Messaging (ActiveMQ, JMS, AMQP, STOMP, Kafka, etc)

•  Legacy (SOAP, mainframe, file processing, proprietary)

•  Managed file processing

•  Streaming

•  Message transformation

•  EIPs

DO WE NEED INTEGRATON?

REAL DEVELOPERS RIDE CAMELS!

•  Small Java library

•  Very popular (200+ components for “dumb pipes”)

•  Powerful EIPs (routing, transformation, error handling)

•  Distributed-systems swiss-army knife!

•  Declarative DSL

•  Embeddable into any JVM (EAP, Karaf, Tomcat, Spring Boot, Dropwizard, Wildfly Swarm, no container, etc)

APACHE CAMEL

INTEGRATION HEAVY LIFTING: APACHE CAMEL

•  Automatic retries, back-off algorithms

•  Dynamic routing

•  Powerful testing/mocking framework

•  Circuit breakers, fallbacks

•  Idempotent consumers

•  Backpressure mechanisms

•  Beautiful REST DSL with built in Swagger support

CAMEL FOR RESILIENT MICROSERVICES

public class OrderProcessorRouteBuilder extends RouteBuilder { @Override public void configure() throws Exception { rest().post(“/order/socks”)

.description(“New Order for pair of socks”).consumes(“application/json”).route() .to(“activemq:topic:newOrder”) .log(“received new order ${body.orderId}”)

.to(“ibatis:storeOrder?statementType=Insert”); }

EXPOSE REST END POINT

public class OrderProcessorRouteBuilder extends RouteBuilder { @Override public void configure() throws Exception { from(“jms:topic:foo”)

.hystrix() .to(“http://fooservice/”).onFallback() .transform().constant(“fallback foo!”).end()

}

CIRCUIT BREAKER/FALLBACK

public class OrderProcessorRouteBuilder extends RouteBuilder { @Override public void configure() throws Exception { from(“jms:topic:foo”)

.idempotentConsumer(header(“fooMessageId”), memoryCache).to(“http://fooservice/”).log(“got response ${body}”);

}

IDEMPOTENT CONSUMER

•  How to run them all locally?

•  How to package them (dependency management)

•  How to test?

•  Vagrant? VirtualBox? VMs?

•  Specify configuration

•  Process isolation

•  Service discovery

•  Multiple versions?

PROBLEMS DEVELOPING MICROSERVICES

LINUX CONTAINERS

RED HAT OPENSHIFT

•  Developer focused workflow

•  Enterprise ready, supported

•  Higher level abstraction above containers for delivering

technology and business value

•  Build/deployment triggers

•  Software Defined Networking (SDN)

•  Docker native format/packaging

•  CLI/Web based tooling

FUSE INTEGRATION SERVICES

https://docs.openshift.com/enterprise/3.1/using_images/xpaas_images/fuse.html

•  Set of tools for integration developers

•  Package your Fuse/Camel services as Docker images

•  Run locally on CDK (container development kit)

•  Manage them with Kubernetes/OpenShift

•  Flat class loader JVMs

•  Supports Spring, CDI, Blueprint

•  Plugs-in to your existing build/release ecosystem (Jenkins/Maven/Nexus/Gitlab,etc)

FUSE INTEGRATION SERVICES

•  How to run them all locally?

•  How to package them

•  How to test?

•  Vagrant? VirtualBox? VMs?

•  Specify configuration

•  Process isolation

•  Service discovery

•  Multiple versions?

PROBLEMS DEVELOPING MICROSERVICES: SOLVED

MICROSERVICES PLATFORM ON KUBERNETES/OPENSHIFT

Christian Posta Principal Middleware Specialist/Architect

Twitter: @christianposta

Blog: http://blog.christianposta.com

Email: [email protected]

Questions, Discussion, Demo!