SpringOne Platform 2017 Meaghan Kjelland, Google This talk is aimed at people who are curious about using Kubernetes and want an overview of how it works. Kubernetes is an open source container orchestration system, developed by Google. It deploys, scales and manages containerized applications. We’ll talk about the fundamental building blocks of a Kubernetes cluster, the architecture of the system, and the problems that it can solve. Then we’ll deploy and scale a Spring Boot application using Kubernetes.

1. Kubernetes for the Spring Developer
Meaghan Kjelland, Software Engineer, Google
@meaghnk
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2. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
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Kubernetes Overview
Declarative descriptions of desired
state
Desired state vs actual state
Provides
• Monitoring and self-healing
• Scaling
• Updates
Can run in the cloud or on premise
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3. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
How does it all work?
etcd - storage
API Server - communication
Controller Manager - makes sure
actual state = desired state
Scheduler - schedules resources
Kubelet - reports status of
workloads
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4. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Pods
Groups of tightly couples containers
that share:
• IP address and port space
• Volumes
• Lifecycle
Runs 1 instance of an application
Not durable
IP address per pod
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5. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 5

6. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 6

7. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 7

8. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
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I want 4 pods,
please!

9. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
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You got it!
I want 4 pods,
please!

10. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Deployments
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Controls number of pods using a
ReplicaSet
Facilitates:
• Scaling
• Updating software versions
• Rolling updates
• Pod health checking and healing
• Rollback

11. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
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12. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Services
Access to dynamic set of pods
Uses labels to find pods
Load balances traffic across nodes
Types:
• ClusterIP
• NodePort
• LoadBalancer
• ExternalName
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13. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
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Volumes
hostPath
emptyDir
Infrastructure specific persistent disks
secrets
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14. Demo

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16. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
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17. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 17

18. Unless otherwise indicated, these slides are © 2013-2017 Pivotal Software, Inc. and licensed under a Creative Commons
Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/ 18

19. Demo

20. 20#springone@s1p
Thank you!