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Kubernetes in 30 minutes (2017/03/10)
- 1. Kubernetes in 30 minutes Mar 10, 2017 Daisuke Maki @lestrrat
- 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
- 14. Swarm
- 15. “Clustering and Discovery” (hey, we’re getting somewhere!)
- 16. =
- 18. K8s on GCP GKE GCE Networking …and others
- 19. Basic Concepts
- 20. Node
- 23. Pod
- 24. Basic unit of deployment in k8s 基本
- 27. Shared storage
- 28. Pod container
- 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
- 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
- 48. Deployment
- 49. Manages Replica Set state transitions
- 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
- 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
- 74. Pod 10.0.96.2 Pod 10.0.96.3 Pod 10.0.96.3 Raw Pod Access
- 75. 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
- 79. 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
- 80. 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
- 81. 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
- 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. Pod container volumes env: - name: foo-secret valueFrom: secretKeyRef: name: foo value: secret-value
- 94. ConfigMaps
- 96. Ingress
- 97. Services are for within the cluster only (external IPs allowed, but don’ use that to serve external requests)
- 98. (New since 1.2) Inbound connections to internal cluster services
- 99. Please checkout my presentation https://docs.google.com/presentation/d/ 11ZN6qgiuZZfVyhBK2hjp1vhp_5N0DOGnAmhPreS3L5A/pub? start=false&loop=false&delayms=3000
- 100. DaemonSets
- 101. Ensure nodes run a copy of a Pod Node prometheus-exporter prometheus-exporter prometheus-exporter Node Node
- 102. PetSets
- 103. PetSets StatefulSets
- 104. Use only when *really* needed
- 105. Keeps unique IDs in replicas (x-0, x-1, x-2,…)
- 106. Questions?