Containerize your Java Applications using Eclipse JKube

Marc Nuri

About me
Illustration of Marc Nuri

Marc Nuri

Senior Software Engineer - Red Hat

Working on:

  • Fabric8 Kubernetes Client
  • Eclipse JKube
1
Agenda
  • Introduction
  • Deploying applications to Kubernetes - Challenges
  • What is Eclipse JKube?
  • Demo
  • Why should I choose Eclipse JKube?
2
Introduction
Code
Build
  • Fat Jar / War / Ear
  • JRE
  • OS
Deploy
  • Server
  • JRE
  • OS
  • Kubernetes
3
Deploying applications to Kubernetes - Challenges

Dockerfile

FROM openjdk:8-jdk-alpine EXPOSE 8080 ARG JAR_FILE=target/*.jar USER 1000:1000 COPY ${JAR_FILE} /deployments/app.jar ENV JAVA_OPTIONS="-Xmx2G" ENTRYPOINT ["java","-jar","/deployments/app.jar"] $ mvn package $ docker build -t user/app:tag ./ $ docker login $ docker push user/app:tag

YAML files

kind: Deployment metadata: name: app spec: replicas: 1 selector: # ... kind: Service metadata: name: app spec: ports: # ... kind: ConfigMap metadata: name: app data: application.yml: >- # ...
$ kubectl apply -f ./your-yaml.yml
4
What is Eclipse JKube?
  • Tools and plugins
    • Generate container images
    • Generate and deploy configuration manifests (Kubernetes / OpenShift)
  • Standalone Java API (Kit) & Maven Plugins
    • Kubernetes Maven Plugin (k8s)
    • OpenShift Maven Plugin (oc)
  • Build Strategies
    • Docker: uses local Docker Daemon (k8s) or remote (oc)
    • S2I: OC only plugin configuration
    • JIB: delegates to build to JIB (Dockerless)
5
What is Eclipse JKube? (2)
  • Support for multiple frameworks and technologies
  • 3 configuration modes
    • Zero Config, Opinionated defaults
      1. Project Analysis and cluster detection
      2. Inferred image configuration
      3. Inferred cluster manifests
    • XML plugin configuration
    • Resource fragments enrich missing parts of opinionated defaults
6
What is Eclipse JKube? (3)
<plugin> <groupId>org.eclipse.jkube</groupId> <artifactId>kubernetes-maven-plugin</artifactId> <version>1.1.0</version> </plugin> $ mvn package k8s:build k8s:push k8s:resource k8s:apply # Or even better $ mvn package k8s:deploy
7

JKube vs. Dockerfile + YAML

Demo

Why should I choose Eclipse JKube?
  • Covers complete Workflow (from code to Kubernetes)
  • No external dependencies
  • The Java way
  • Zero Configuration
  • Additional tools for Developers (Debug, Watch, etc.)
9

Thank you!

github.com/eclipse/jkube @jkubeio www.eclipse.org/jkube