Microservices with Apache Camel, DDD, and Kubernetes
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Building microservices requires more than just infrastructure, but infrastructure does have a role. In this talk we look at microservices from an enterprise perspective and talk about DDD, Docker, Kubernetes and how established open-source projects in the integration space fits a microservices architecture
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Microservices with Apache Camel, DDD, and Kubernetes
- 1. CLOUD NATIVE CAMEL RIDING WITH KUBERNETES AND OPENSHIFT @christianposta 17 June 2016
- 2. If change is happening on the outside faster than on the inside the end is in sight. Jack Welch, former CEO, GE Company listed on Standard & Poors life expectancy
- 3. 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!
- 4. 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
- 5. • 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
- 6. Infrastructure for scale Organizational structure Identify a useful domain model with boundaries TRANSFORMATION CHALLENGES
- 8. 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
- 9. Book checkout / purchase Title Search Recommendations Weekly reporting
- 11. 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
- 12. DO WE NEED INTEGRATON?
- 13. REAL DEVELOPERS RIDE CAMELS!
- 14. • 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
- 15. INTEGRATION HEAVY LIFTING: APACHE CAMEL
- 16. • 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
- 18. 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
- 19. 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
- 20. 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
- 22. • 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
- 23. LINUX CONTAINERS
- 24. 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
- 26. • 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
- 27. • 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
- 33. Christian Posta Principal Middleware Specialist/Architect Twitter: @christianposta Blog: http://blog.christianposta.com Email: [email protected] Questions, Discussion, Demo!