MicroService and MicroContainer with Apache Camel
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This document discusses designing a REST microservice using Apache Camel technology. It covers integrating systems using Camel, implementing enterprise integration patterns with Camel, using different Camel DSLs like Java, XML, and REST. It demonstrates running the Camel application as a microservice in a Docker container and deploying it on Kubernetes and OpenShift using Fabric8 tools.
MicroService and MicroContainer with Apache Camel
- 1. Design a REST Microservice using Apache Camel technology Charles Moulliard (@cmoulliard) 22 Jan 2016
- 2. Who Committer, Coder, Architect Work on Apache Camel, Karaf, Fabric8, Hawtio, Apiman, DeltaSpike Mountain Biker, Belgian Beer Fan Blog: Twitter: Email: http://cmoulliard.github.io @cmoulliard [email protected]
- 3. Agenda Integration … Apache Camel Micro Container Kubernetes Service
- 4. Integration
- 5. Point to Point vision Integrate many systems. Play with formats & protocols
- 6. Hub Approach In 2003, it was reported that 70% of all EAI projects fail !
- 7. Bus Communication done through a Bus with Normalized messages
- 8. MicroService It is an architectural style where an application composed of individual standalone services communicating using lightweight protocols in event based manner
- 9. Apache Camel
- 10. Apache Camel Java Integration Framework Implements Domain Specific Language Supports Enterprise Integration Patterns
- 11. Enterprise Patterns implemented and more : Loadbalancer, Throttler, Delayer, … > 50 patterns
- 12. Route, processor Camel project Collection of routes Route = Processor(s) + Interceptor(s) Producing or consuming Message
- 13. Java DSL Fluent API, extend RouteBuilder class importorg.apache.camel.builder.RouterBuilder; publicclassFilterRouteextendsRouteBuilder{ publicvoidconfigure()throwsException{ from("activemq:queue:all") .filter(xpath("/quote/product='widget'")) .to("activemq:widget"); } }
- 14. XML DSL Spring, Blueprint <?xmlversion="1.0"encoding="UTF-8"?> <beansxmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring- http://camel.apache.org/schema/springhttp://camel.apache.org/schema/spring/camel-spring.xsd "> <beanid="quotesService"class="my.cool.demo.camel.QuotesService"/>" <camelContext xmlns="http://camel.apache.org/schema/spring"> <route> <fromuri="activemq:queue:all"/> <filter> <xpath>"/quote/product/='widget"</xpath> <beanid="quotesService"method="widget"/> </filter> </route> </camelContext>
- 15. REST DSL One of the components available : servlet, jetty, netty, spark, restlet, undertow Hostname Port Root of the REST Application endpoint @Overridepublicvoidconfigure()throwsException{ restConfiguration() .component("servlet") .host(HOST) .setPort(PORT); //usetherestDSLtodefinetherestservices rest("/users/") .get("{id}/hello") .route() .process(newProcessor(){ publicvoidprocess(Exchangeexchange)throwsException{ Stringid=exchange.getIn().getHeader("id",String.class); exchange.getOut().setBody("Hello"+id+"!Welcomefrompod:" } }); 1 2 3 4 5 1 2 3 4
- 16. Container agnostic Endpoints registered CamelContext Policy Security Lifecycle Tracing JMX Threads can be configured
- 17. Demo
- 18. Docker Container
- 19. Process
- 20. Docker Union FS mounted with immutable images Benefits: portability, reusability, versioning, application-centric
- 21. Docker config
- 22. Docker Container runtime, Process launcher
- 23. Maven Docker Plugin docker:build Build image of app docker:push Push image <docker.from>fabric8/s2i-java:1.2</docker.from> <docker.image>${docker.registryPrefix}fabric8/${project.artifactId}:${project.version} <docker.port.container.jolokia>8778</docker.port.container.jolokia> <docker.registryPrefix>${env.DOCKER_REGISTRY}/</docker.registryPrefix> <plugin> <groupId>org.jolokia</groupId> <artifactId>docker-maven-plugin</artifactId> <version>${docker.maven.plugin.version}</version> <configuration> <images> <image> <name>${docker.image}</name> <build> <from>${docker.from}</from> <assembly> <basedir>/deployments</basedir> <descriptorRef>hawt-app</descriptorRef> </assembly> <env> <JAVA_LIB_DIR>/deployments/lib</JAVA_LIB_DIR> <JAVA_MAIN_CLASS>org.apache.camel.cdi.Main</JAVA_MAIN_CLASS> </env>
- 24. With Docker
- 27. Kubernetes Runtime & Operational management of containers ApiServer (event, status) Scheduler, Controller & State Storage Agent - Kubelet - manage containers on host Containers pods (= shared docker containers)
- 28. Kubernetes
- 29. Pod & docker Communicate to each other using skyDNS to resolve hostname
- 30. Pod & port Ports can be exposed
- 31. Pod & volume Share data using mounted volume between host & container
- 32. Kubernetes Service Kube Service loadbalanced through the pods using HA-Proxy Routes map private with public IP address
- 34. Fabric8
- 35. Fabric8 Maven Plugin fabric8:json generates Kube MetaData fabric8:apply deploy on Openshift <fabric8.service.name>hellorest</fabric8.service.name> <fabric8.service.port>9090</fabric8.service.port> <fabric8.service.containerPort>8080</fabric8.service.containerPort> <fabric8.label.component>${project.artifactId}</fabric8.label.component> <fabric8.label.container>tomcat</fabric8.label.container> <fabric8.label.group>demo</fabric8.label.group> <fabric8.service.type>LoadBalancer</fabric8.service.type> <fabric8.iconRef>camel</fabric8.iconRef> <plugin> <groupId>io.fabric8</groupId> <artifactId>fabric8-maven-plugin</artifactId> <version>${fabric8.version}</version> <executions> <execution> <id>json</id> <goals> <goal>json</goal> </goals>
- 36. With OpenShift & Kubernetes
- 38. Questions Twitter : Camel Rest MicroService in Action @cmoulliard https://github.com/FuseByExample/microservice-camel-in-action http://fabric8.io/