Brought to you by... What is... Server for running and managing - - PowerPoint PPT Presentation

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Brought to you by... What is... Server for running and managing - - PowerPoint PPT Presentation

Feb 03, 2023 436 likes •791 views

in the belly of the Brought to you by... What is... Server for running and managing Linux containers. What are Linux containers? Para-virtualized Linux instances. Why not regular virtualization? slooooooow gigantic images

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in the belly of the

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Brought to you by...

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What is...

Server for running and managing Linux containers.

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What are Linux containers?

Para-virtualized Linux instances.

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Why not regular virtualization?

  • slooooooow
  • gigantic images
  • aggressive resource allocation
  • bad API
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Key concepts

  • image (immutable, no state)
  • container (has state)

Container is the running image.

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Docker awesomeness #1

Commands.

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Docker awesomeness #2

Layers.

WAR Tomcat JRE Ubuntu base

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Docker awesomeness #3

Registries.

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Docker awesomeness #4

Build once. Deploy everywhere!

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Dockerfiles

“Recipes” for the new images.

FROM ubuntu EXPOSE 8080 RUN apt-get install java RUN mkdir /jars ADD target/app.jar /jars/ CMD ["java", "-jar", "/jars/app.jar"]

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Create new image in the local repo

$ docker build -t com.me/app:1.0 $ docker run -t com.me/app:1.0

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Apache Camel

Framework that routes messages like crazy.

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How to deploy Camel?

  • Karaf (JBoss Fuse, ServiceMix, Talend ESB)
  • Tomcat
  • WildFly (JBoss EAP)
  • standalone/embeded
  • Akka plugin
  • Grails plugin
  • Spring Boot
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Camel and Docker

How to split it? What should I dockerize?

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Messaging architecture in a nutshell

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Concrete messaging architecture

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Dockerized example

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In-endpoint route

from(“netty-http:http://0.0.0.0:18080”). setBody(randomUUID()). inOnly("jms:invoices"); ... new ActiveMQConnectionFactory("tcp://amqbroker:6162")

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Processing route

from("jms:invoices"). setBody(). groovy("new Invoice(request.body,currentTimeMillis())"). to("mongodb:mongo?...operation=insert"); ... new ActiveMQConnectionFactory("tcp://amqbroker:6162"); ... new MongoClient("mongodb");

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How can I get database images?

docker run -d -p 27017:27017

  • -name mongodb dockerfile/mongodb

Provided by database community/vendor.

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How can I put fresh jar into image?

Docker Maven plugin by Roland ‘Jolokia’ Huß

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How to bootstrap Camel?

  • no Karaf bundle activators
  • no server (Tomcat, etc.)
  • how can we start CamelContext?
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Custom class with the main method

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Spring Boot for Camel

http://projects.spring.io/spring-boot

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Camel + Spring Boot: step #1

Take a Spring Boot fat jar.

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Camel + Spring Boot: step #2

Add camel-spring-boot jar to your classpath.

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Camel + Spring Boot: step #3

Add Camel route to your classpath.

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Camel + Spring Boot: step #4

Dockerize your fat jar and run it!

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ENV-centric runtime configuration

# override endpoint definition via ENV variable docker run -e FROM=jms:queue -it my-springboot-camel-app # run with the given Spring profile docker run -e spring.profiles.active=production -it my- springboot-camel-app

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Monitoring

Expose JMX via REST with the Jolokia base image.

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Kubernetes

  • orchestration of many Docker containers
  • ...and many Docker servers!
  • logical container groups (pods)
  • auto-scaling
  • wiring your Docker stuff together
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Thank you!