Kubernetes in 20 minutes - HDE Monthly Technical Session 24

1. Kubernetes in 20 minutes HDE Monthly Technical Session July 22, 2016 Daisuke Maki @lestrrat

3. Netscape Navigator

4. Netscape Navigator

5. Kubernetes

6. κυβερνήτης

7. k8s

8. “Something to do with containers…?

9. •You know about containers •You know about orchestration •You know about the painful art of deploying stuff Assumptions

10. Docker

11. “Random containers doing their own sh*t”

12. Compose

13. “Foreman on Acid”

14. Swarm

15. “Clustering and Discovery” (hey, we’re getting somewhere!)

17. “Batteries Included”

18. K8s on GCP GKE GCE Networking …and others

19. Basic Concepts

20. Node

21. Hosts running k8s daemons

22. Node kubelet Node kubelet Node kubelet Master Scheduler etc.. API

23. Pod

24. Basic unit of deployment in k8s

25. Group of Containers

26. Container configurations

27. Shared storage

28. Pod container

29. Pod container container

30. Pod container container container

31. Pod container container container nginx app redis/cache e.g.

32. Scheduled together (“co-scheduled”)

33. Guaranteed to be on the same node (“co-located”)

34. Node NodeNode

35. Node NodeNode Depends on each node’s resource availability and each pod’s resource requirements

36. Node Node container container container

37. Node Node container container container This will NEVER happen

38. Miscellaneous • Each pod has its own IP address • Pods are expected to be stateless

39. Replica Set

40. Keeps track of Pod replicas

41. Replica Set replicas: 3  template:

42. Replica Set replicas: 3  template: A

43. Replica Set replicas: 3  template: A B

44. Replica Set replicas: 3  template: CA B

45. Replica Set replicas: 3  template: CA B

46. Replica Set replicas: 3  template: A B

47. Replica Set replicas: 3  template: A B D

48. Deployment

49. Manages Replica Set state transitions

50. Deployment replicas: 3  template:

51. Deployment replicas: 3  template: Replica Set A replicas: 3  template:

52. Deployment replicas: 3  template: Replica Set A replicas: 3  template: Change some settings, please!

53. Deployment replicas: 3  template: Replica Set A replicas: 3  template: 2 Change some settings, please!

54. Deployment replicas: 3  template: Replica Set A replicas: 3  template: Replica Set B replicas: 2  template: 2 Change some settings, please!

55. Deployment replicas: 3  template: Replica Set A replicas: 3  template: Replica Set B replicas: 2  template: 2 Change some settings, please!

56. Deployment replicas: 3  template: Replica Set B replicas: 2  template: 2 Change some settings, please!

57. Keeps track of state change history

58. Deployment replicas: 3  template:

59. Deployment replicas: 3  template: A replicas: 3  template:

60. Deployment replicas: 3  template: A replicas: 3  template: Change some settings, please!

61. Deployment replicas: 3  template: A replicas: 3  template: 2 Change some settings, please!

62. Deployment replicas: 3  template: A replicas: 3  template: B replicas: 2  template: 2 Change some settings, please!

63. Deployment replicas: 3  template: A replicas: 3  template: B replicas: 2  template: 2 Change some settings, please!

64. Deployment replicas: 3  template: B replicas: 2  template: 2 Change some settings, please!

65. Deployment replicas: 3  template: B replicas: 2  template: 2 Oh wait, I actually didn’t want to do that…

66. Deployment replicas: 3  template: B replicas: 2  template: 2 Oh wait, I actually didn’t want to do that… 3

67. Deployment replicas: 3  template: B replicas: 2  template: 2 Oh wait, I actually didn’t want to do that… rollback 3

68. Deployment replicas: 3  template: B replicas: 2  template: 2 Oh wait, I actually didn’t want to do that… rollback A replicas: 3  template: 3

69. Deployment replicas: 3  template: B replicas: 2  template: 2 Oh wait, I actually didn’t want to do that… rollback A replicas: 3  template: 3

70. Deployment replicas: 3  template: 2 Oh wait, I actually didn’t want to do that… A replicas: 3  template: 3

71. Services

72. Logical set of Pods (and ways to access them)

73. Pod 10.0.96.2 Pod 10.0.96.3 Pod 10.0.96.3 Raw Pod Access

76. Pod 10.0.96.2 Pod 10.0.96.3 Raw Pod Access

77. Pod 10.0.96.2 Pod 10.0.96.3 Raw Pod Access

78. Pod 10.0.96.3 role=web Access Via Service Pod 10.0.96.4 role=web Service match role=web Pod 10.0.96.2 role=web Pod 10.0.96.5 role=db

82. Access Via Service Pod 10.0.96.4 role=web Service match role=web Pod 10.0.96.2 role=web Pod 10.0.96.5 role=db

83. Access Via Service Pod 10.0.96.4 role=web Service match role=web Pod 10.0.96.2 role=web Pod 10.0.96.5 role=db

84. Access Via Service Pod 10.0.96.6 role=web Pod 10.0.96.4 role=web Service match role=web Pod 10.0.96.2 role=web Pod 10.0.96.5 role=db

85. Access Via Service Pod 10.0.96.6 role=web Pod 10.0.96.4 role=web Service match role=web Pod 10.0.96.2 role=web Pod 10.0.96.5 role=db

86. Secrets

87. Store pieces of data in k8s

88. e.g. Identity Information

89. (securely)

90. (…in the future)

91. Secret key1 → base64 value key3 → base64 value key2 → base64 value

92. Pod container volumes container:  volumeMounts: - name: certificates mountPath: /etc/ssl/certs volumes: - name: certificates secret: secretName: ca-certificates

93. ConfigMaps

94. Same as Secrets (Unprotected)

95. Ingress

96. Services are for within the cluster only

97. (New since 1.2) Inbound connections to internal cluster services

98. Please checkout my presentation https://docs.google.com/presentation/d/ 11ZN6qgiuZZfVyhBK2hjp1vhp_5N0DOGnAmhPreS3L5A/pub? start=false&loop=false&delayms=3000

99. DaemonSets

100. Ensure nodes run a copy of a Pod Node prometheus-exporter prometheus-exporter prometheus-exporter Node Node

101. PetSets

102. snip.

103. Questions?

104. Appendix: ECS vs GKE https://railsadventures.wordpress.com/2015/12/06/why-we- chose-kubernetes-over-ecs/

105. If you want to play with k8s, I’m doing this entirely on GCP/GKE… Come Join https://slack-invite-dot-builderscon-1248.appspot.com/

Kubernetes in 20 minutes - HDE Monthly Technical Session 24

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Kubernetes in 20 minutes - HDE Monthly Technical Session 24