The document discusses Docker, Kubernetes, and OpenShift. It provides an overview of Docker as a platform for running and managing Linux containers. Kubernetes is introduced as a platform for scaling Docker horizontally across multiple machines. Key concepts of Kubernetes include pods, replication controllers, and services. OpenShift is described as Kubernetes with additional features like routing, multi-tenancy, an integrated build and deploy pipeline, and a marketplace of microservices.

1. Broughttoyou
byHenrykKonsek
Containerize!
On Docker, Kubernetes and stuff

2. Henryk Konsek
- engineer at Red Hat
- open source junkie
@hekonsek

3. ● Docker
● Kubernetes overview
● Kubernetes services
● OpenShift
This talk
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4. Docker
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5. Server for running and managing Linux containers.
What is...
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6. Operating-system-level virtualization.
What are Linux containers?
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7. chroot on steroids + some kernel magic
What are Linux containers?
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8. ● slooooooow
● gigantic images
● aggressive resource allocation
● bad API
Why not regular virtualization?
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9. Container is the running image.
Key concepts
● image (immutable, no state)
● container (mutable, has state)
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10. Container is a running image.
Key concepts
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11. Archived file system + metadata.
Docker image
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12. Commands.
Docker awesomeness #1
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13. Layers.
Docker awesomeness #2
WAR
Tomcat
JRE
Ubuntu base
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14. Registries.
Docker awesomeness #3
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15. Build once. Deploy everywhere!
Docker awesomeness #4
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16. Immutable deployment. Use ENV variable to configure the container.
Docker awesomeness #4
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17. “Recipes” for creating 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"]]
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18. Create new image
$ docker build -t com.me/app:1.0 .
$ docker run -t com.me/app:1.0]
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19. Let’s create a production-grade container!
Demo!
FROM ubuntu
RUN apt-get update -qqy
RUN apt-get install -qqy cowsay
ENTRYPOINT ["/usr/games/cowsay"]
CMD ["Hello Docker!"]
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20. Docker Maven plugin
How can I put a fresh jar into an image?
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21. Provided by the database community/vendor.
How can I get database image?
docker run -d -p 27017:27017 --name mongo mongo
]
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22. Kubernetes overview
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23. A platform to scale Docker horizontally.
Kubernetes
by...
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24. You can start many containers with your Docker server.
Why scale Docker?
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25. But at some point you have to add more physical machines.
Why scale Docker?
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26. TL;DR; YES!
Is scaling Docker hard?
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27. High availability - single Docker server is SPOF.
Why scale Docker?
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28. Helps you to keep your scaled Docker stuff together.
Kubernetes
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29. Install and admin it yourself. Or...
Where can I find Kubernetes?
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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)
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31. - REST API
- etcd key/value store
- controller manager server
Kubernetes architecture - master node
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32. - Docker server
- kubelet
- network proxy
Kubernetes architecture - minion node
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33. Groups of containers running at the same physical machine.
Pod - unit of deployment
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34. Kubernetes guarantees all or nothing deployment and execution of
pods.
Pod - atomic unit of deployment
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35. All containers within the pod can access the same volumes.
Pod nodes == shared disk
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36. Pods uses direct connections for the intra-pod communication.
Pod - internal communication
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37. Pods use network proxy for the inter-pod communication.
Pod - external communication
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38. The network proxy
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39. Guarantees N-instances of pods running at the same time.
Replication controller
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40. Starts missing instances of the pods.
Replication controller
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41. Performs health checks. Can kill and restart failing nodes.
Replication controller
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42. In the Kubernetes world, starting the server is not human
responsibility anymore! How cool is that?
Replication controller
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43. Kubernetes services
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44. The typical micoservices developer.
Services
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45. Eureka? Etcd? Consul?
How to discover a service?
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46. 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));
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47. OpenShift
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48. Kubernetes + some cool things.
OpenShift 3
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49. - Enterprise (private cloud)
- On-Line (public cloud)
- Origin (community project)
OpenShift 3 types
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50. You can install OS Origin on your local machine as a Docker container.
OpenShift 3
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51. - access external services using single URL
- HAproxy instance bound to the services
- TLS/SSL termiantion rules
OpenShift 3 - routing
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52. Local (docker-based) cloud + Docker images + Kubernetes =
smooth transition from dev to the production
OpenShift 3
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53. OpenShift provides user groups based on the Kubernetes namespaces.
Multi-tenancy
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54. OpenShift comes with the CI server that can build and deploy the
containers for you.
Build & deploy pipeline
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55. Off-the-shelf microservices.
OpenShift marketplace
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56. Thank you!
Henryk Konsek
@hekonsek
hekonsek@gmail.com
@hekonsek