Kubernetes. An open platform for container orchestration. Johannes M. Scheuermann. Karlsruhe,

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1 Kubernetes An open platform for container orchestration Johannes M. Scheuermann Karlsruhe,

2 Johannes M. Scheuermann Cloud Platform inovex Software-Defined Datacenters Infrastructure as Code Cloud technologies High Availability & 2

3 How to manage millions of containers/machines?

4 Containers cgroups and namespaces Application package management (nearly) Platform independent Resource separation Resource monitoring

6 History Unified container-management Borg Autopilot Omega Before: Babysitter + Global Work Queue predicting resource requirements Splitting parts of the control plane Multiple Schedulers

7 Architecture

8 Architecture API Controller- Manager Scheduler etcd Master Store Node Node Node Kubelet Kubelet Kubelet Kube-proxy Kube-proxy Kube-proxy

9 Design Goals Portable General-Purpose Flexible Extensible Automatable

10 Principals

11 s Container Container Container Process Resources Ports Process Resources Ports Process Resources Ports Shared Resources

12 Deployments ReplicaSet r1 Deployment

13 Deployments ReplicaSet r1 Deployment ReplicaSet r2

14 Deployments ReplicaSet r1 Deployment ReplicaSet r2

15 Deployments ReplicaSet r1 Deployment ReplicaSet r2

16 Deployments ReplicaSet r1 Deployment ReplicaSet r2

17 Deployments ReplicaSet r1 Deployment ReplicaSet r2

18 The magic glue - Labels Simple Key-Value pairs Can be attached to anything LabelSelectors used for selection Can be used for scheduling choices Extremely simple and mighty

19 Services 1 app:student,v:1 x Service Student 2 app:student,v:1 3 app:student,v:1 4 app:student,v:2

20 Persistent Volumes Admin Persistent Volumes PVClaim 2 StorageClass User

21 Further principals Namespaces StatefulSet DaemonSet Batch/Scheduled Jobs Ingress...

22 An open platform

23 API driven Complete communication over API s Well defined API s grpc Extensible platform Custom Resource Definitions Custom Schedulers API aggregation layer

24 Built on standards (plugins) CRI Kubernetes CNI CSI

25 Core Infrastructure Flexible infrastructure as building block Cluster add-ons Logging / DNS / Monitoring Spark on Kubernetes Everything deployed as containers Service Mesh on top /

26 Cloud-vendor neutral

27 Platform independent No dependency to any cloud provider Doesn t care if running on bare-metal or in the cloud Cloud provider will be moved out-of-tree Kubernetes can make use of the underlying infrastructure Basically needs only an OS that runs containers Linux and Windows support (arm/amd64)

28 Outlook

29 Kubernetes Federation Manage multiple Kubernetes clusters One federated control plane On-premise or multi-cloud Running global services Some known issues High Availability Challenge -> Storage

30 Kubernetes 1.8+ Focus on security and stability Allowing more customization Improve cluster federation Kubernetes and Big Data

31 Conclusions

32 Conclusions Open platform (OSS) Can be used to run simulations/tests Is used in some academic fields e.g. Can be extended for special needs Growing eco-system

33 We are hiring! 33

34 Q&A

35 Further reading

36 Further reading ontributors/devel/container-runtime-interface.md

37 Further reading GA3OjRNIiO3IyKmA-GU7CXaxbihy48ns/edit#gid=0

scheuermann@inovex.de CC BY-NC-ND inovex.

38 Johannes M. Scheuermann inovex GmbH CC BY-NC-ND inovex.de +JohannesScheuermann github.com/johscheu youtube.com/inovexgmb H

Kubernetes 101. Doug Davis, STSM September, 2017

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