Containerize! Between Docker and Jube.

1. Broughttoyou
byHenrykKonsek
Containerize!
Between Docker and Jube

2. @hekonsek

3. ● Docker
● Kubernetes
● OpenShift
● Fabric8
● Jube
This talk

4. Server for running and managing Linux containers.
What is...

5. Operating-system-level virtualization.
What are Linux containers?

6. chroot on steroids + some kernel magic
What are Linux containers?

7. ● slooooooow
● gigantic images
● aggressive resource allocation
● bad API
Why not regular virtualization?

8. Container is the running image.
Key concepts
● image (immutable, no state)
● container (mutable, has state)

9. Container is the running image.
Key concepts

10. Archived filesystem + metadata.
Docker image

11. Commands.
Docker awesomeness #1

12. Layers.
Docker awesomeness #2
WAR
Tomcat
JRE
Ubuntu base

13. Registries.
Docker awesomeness #3

14. Build once. Deploy everywhere!
Docker awesomeness #4

15. Immutable deployment. Use ENV variable to the container.
Docker awesomeness #4

16. “Recipes” for the new images.
Dockerfiles
FROM ubuntu
EXPOSE 8080
RUN apt-get install java
RUN mkdir /jars
ADD target/app.jar /jars/
CMD ["java", "-jar", "/jars/app.jar"]]

17. Create the new image
$ docker build -t com.me/app:1.0 .
$ docker run -t com.me/app:1.0]

18. Let’s create the production-grade container!
Demo!
FROM ubuntu
RUN apt-get update -qqy
RUN apt-get install -qqy cowsay
ENTRYPOINT ["/usr/games/cowsay"]
CMD ["Hello Docker!"]

19. Docker Maven plugin by Roland ‘Jolokia’ Huß
How can I put a fresh jar into an image?

20. How can I put a fresh jar into an image?
<image>
<name>${project.artifactId}:${project.version}</name>
<build>
<from>hekonsek/fatjar:0.0.10-SNAPSHOT</from>
<assemblyDescriptorRef>artifact</assemblyDescriptorRef>
<exportDir>/jars</exportDir>
</build>
</image>
mvn docker:buid docker:push

21. Provided by the database community/vendor.
How can I get database image?
docker run -d -p 27017:27017 --name mongo mongo
]

22. Yes. That’s all I can say ;) .
Any Red Hat customers using Docker in
production?

23. The platform to scale Docker horizontally.
Kubernetes
by...

24. You can start many containers with your server Docker.
Why scale Docker?

25. But at some point you have to add more physical machines.
Why scale Docker?

26. Now networking between these containers becomes a challenge :(
Why scale Docker?

27. High availability - single Docker server is SPOF.
Why scale Docker?

28. Helps you to keep your scaled Docker stuff together.
Kubernetes

29. Install and admin it yourself. Or...
Where can I find Kubernetes?

30. Where can I find Kubernetes?
- Red Hat Atomic
- Red Hat Linux 7.1
- CoreOS Linux
- OpenShift 3
- GKE (Google Container Engine)
- Microsoft Azure
- All the major cloud providers (soon)

31. - REST API
- etcd key/value store
- controller manager server
Kubernetes architecture - master node

32. - Docker server
- kubelet
- network proxy
Kubernetes architecture - minion node

33. Groups of containers running at the same physical machine.
Pod - unit of deployment

34. Kubernetes guarantees all or nothing deployment and execution of
pods.
Pod - atomic unit of deployment

35. All containers within the pod can access the same volumes.
Pod nodes == shared disk

36. Pods uses direct connections for the intra-pod communication.
Pod - internal communication

37. Pods use network proxy for the inter-pod communication.
Pod - external communication

38. The network proxy

39. Guarantees N-instances of pods running at the same time.
Replication controller

40. Starts missing instances of the pods.
Replication controller

41. Performs health checks. Can kill and restart failing nodes.
Replication controller

42. In the Kubernetes world, starting the server is not human
responsibility anymore! How cool is that?
Replication controller

43. The typical micoservices developer.
Services

44. Can we do better than Eureka?
How to discover the service?

45. Try to imagine something simpler.
Services coordinates ==
environment variables
String host = System.getenv("MONGO_SERVICE_DB_HOST");
String port = System.getenv("MONGO_SERVICE_DB_PORT");
Mongo mongo =
new Mongo(host, Integer.parseInt(port));

46. Kubernetes + something extra.
OpenShift 3 == Cool PaaS

47. - Enterprise (private cloud)
- On-Line (public cloud)
- Origin (community project)
OpenShift 3 types

48. You can install OS Origin on your local machine as a Docker container.
OpenShift 3

49. - access external services using single URL
- HAproxy instance bound to the services
- TLS/SSL scope rules
OpenShift 3 - routing

50. Local (docker-based) cloud + Docker images + Kubernetes =
smooth transition from dev to the production
OpenShift 3

51. OpenShift provides user groups based on the Kubernetes namespaces.
Multi-tenancy

52. OpenShift comes with the CI server that can build and deploy the
containers for you.
Build & deploy pipeline

53. Off-the-shelf microservices!
OpenShift marketplace

54. Dev (and Ops) extras on the top of the Kubernetes.
Fabric8

55. Base examples you can use as templates for docker containers.
Value added by Fabric8 -
quickstarts

56. Maven plugins making it easier to deploy Docker images into Kubernetes.
Value added by Fabric8 -
developer tooling

57. Value added by Fabric8 -
centralized logging

58. - CDI extension for Kubernetes
- Kubernetes API client for Java
- Spring Boot Kubernetes integration
- Kubernetes JUnit goodies
Value added by Fabric8 -
extra libraries

59. Value added by Fabric8 -
fancy web UI

60. Pure-Java implementation of the Kubernetes API (no Docker here!)
Jube

61. Why Jube?
- your VPS doesn’t support Docker
- your operating system doesn’t support Docker/Kubernetes
- you’re not operational ready to go into the production with
Docker

62. Jube architecture

63. Demo!
CowSay and MongoDB in Kubernetes. How cool is that?