Java Day Kharkiv - Next-gen engineering with Docker and Kubernetes
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The document discusses next-generation engineering using Docker and Kubernetes, emphasizing the differences between containers and virtual machines, as well as the importance of container management. It provides an example of a Dockerfile and the steps for building and deploying an application while introducing key concepts of Kubernetes architecture, services, and replication controllers. Additionally, the document cautions against misuse of Kubernetes features and offers resources for hands-on learning.
![Dockerfile
Dockerfile
FROM java:jdk
COPY chnorr.jar /app.jar
EXPOSE 8080
ENTRYPOINT ["java", "-jar", "/app.jar"]](https://image.slidesharecdn.com/javadaykharkiv-151012082934-lva1-app6892/85/Java-Day-Kharkiv-Next-gen-engineering-with-Docker-and-Kubernetes-6-320.jpg)
![Workflow
Dockerfile
FROM java:jdk
COPY chnorr.jar /app.jar
EXPOSE 8080
ENTRYPOINT ["java", "-jar", "/app.jar"]
dev
Java code &
Dockerfile
Compile &
Unit test
chnorr.jar build registry
(private or
public)
push ops
pull
Container engine
docker run](https://image.slidesharecdn.com/javadaykharkiv-151012082934-lva1-app6892/85/Java-Day-Kharkiv-Next-gen-engineering-with-Docker-and-Kubernetes-7-320.jpg)
Java Day Kharkiv - Next-gen engineering with Docker and Kubernetes
- 1. Next-gen engineering with Docker and Kubernetes
- 2. :~ whoami: Antons Kranga Cloud architect and full-stack developer with ~15 years in Java technology
- 5. Docker Guest OS VM Guest OS Container engine Container engine Hypervisor VM Applications isolated inside containers Rapid deployment Focuses on service is inside container dev ops Focuses on env outside container Dockerfile is a contract
- 6. Dockerfile Dockerfile FROM java:jdk COPY chnorr.jar /app.jar EXPOSE 8080 ENTRYPOINT ["java", "-jar", "/app.jar"]
- 7. Workflow Dockerfile FROM java:jdk COPY chnorr.jar /app.jar EXPOSE 8080 ENTRYPOINT ["java", "-jar", "/app.jar"] dev Java code & Dockerfile Compile & Unit test chnorr.jar build registry (private or public) push ops pull Container engine docker run
- 8. Things to remember Containers have ephemeral. Persistent volumes should be managed separately App logs > /dev/stdout. Logs will be streamed to log collector service Use environment variables to inject configuration parameters inside container Do not use ENV vars for secrets Use private registry to distribute containers Containers != VM (!!!)
- 10. Kubernetes Cluster manager for your containers
- 11. Docker needs Platform Guest OS VM Guest OS Container engine Container engine Hypervisor VM Docker is just a container engine many things are not there • Networking • Storage • Service discovery • Container scheduling • Placement and load balancing • Routing • Self healing ...
- 13. Logical view Service ports 80,443 10.0.1.10 container container 10.0.1.11 container container load balancer services pods rc
- 14. Chuck Norris pod example Service apiVersion: v1 kind: Service metadata: name: chuck-norris labels: name: chuck-norris-serv selector: chuck: norris spec: type: LoadBalancer clusterIP: 10.0.1.10 ports: - name: http port: 80 Replication Controller apiVersion: v1 kind: ReplicationController metadata: name: chuck-norris labels: chuck: norris spec: replicas: 3 selector: name: chuck-norris template: metadata: labels: name: chuck-norris spec: containers: - name: chuck image: akranga/chnorr:1.0.0 ports: - name: http containerPort: 8080 port exposed in Dockerfile
- 15. Things to remember DIND makes you naked needs privileged mode Do not abuse etcd of kubernetes you can brake the platform
- 16. Jenkins Better continuous delivery model
- 17. CI with Kubernetes dev push push ops pullgit master Compile & Unit test app.jar build private registry Create pod Chuck Norris app pull
- 18. Putting all together jenkins ports 80 jenkins_master load balancer services pods storage jenkins_java_slave jenkins_kube_slave jenkins_docker_slave jenkins ports 80 private_registry chnorr green ports 80 chucknorris:b24 chucknorris:b25 chnorr latest ports 80 cloud storage cloud storage
- 19. Things to remember Workflows can be part of app-baseline Share workspace between slaves Don’t forget private docker registry DIND is evil but unavoidable
- 20. Grab hands-on practice labs here: https://github.com/akranga/kube-workshop
- 21. Questions?