給 RD 的 Kubernetes 初體驗 (GDG Cloud KH 2019-08 version)

1. Technical Manager William Yeh 葉秉哲　給 RD 的 Kubernetes 初體驗 … with a series of hands-on labs 2019-08-11

2. • PhD in Computer Science, NCTU, Taiwan • CSPO (Certiﬁed Scrum Product Owner) from Scrum Alliance • PSM I (Professional Scrum Master I) from Scrum.org • Technical manager @ Titansoft (since Mar 2019) • Server director & Scrum master @ Gogolook • Active speaker and trainer for software architecture, DevOps, agile, and theory of constraints

3. Containers Kubernetes Cloud Agenda

4. Containers Kubernetes Cloud Agenda Labs 1.0 — 3.0 4.0 — 5.0 6.0 — 7.0

5. Agenda Know promising trends Adopt gradually Prepare mindset Goals Containers Kubernetes Cloud Labs 1.0 — 3.0 4.0 — 5.0 6.0 — 7.0

6. GKE Setup🅐 a - Redeem Google Cloud coupon b - Create project in GCP c - Create GKE cluster

7. Redeem coupon Please follow steps in your handout NOW!

8. Create K8s-enabled Project https://console.cloud.google.com/projectselector2/kuber netes Should already done before you’re here...

9. Create GKE cluster gcloud config set project PROJECT_ID gcloud config set compute/zone us-west1-a gcloud container clusters create k8s201908 --num-nodes 3

10. Lab Setting�� Tag 1.0 2.0 3.0 4.0 5.0 6.0 7.0

11. Lab material See the demo ﬁrst!

12. Lab material For each revision, pay attention to: 1. image versions 2. diff in code and configuration Use git diff --stat HEAD~1 HEAD to see diff between revisions. Tag 1.0 2.0 3.0 4.0 5.0 6.0 7.0

13. Image tags Lab # Frontend API 1.0 N/A N/A 2.0 N/A 2.0 3.0 3.0 3.0 4.0 3.0 3.0 5.0 5.0 3.0 6.0 auto auto 7.0 auto auto & stable

14. Lab material https://github.com/William-Yeh/workshop-k8s201908 or http://bit.ly/k8s-201908 for short 1. Open browser 2. Git clone to your laptop

15. Containers 1.0 - Legacy 2.0 - Docker 3.0 - Frontend/backend separation ��

16. Why containers?

17. Lab # 1.0 Legacy

18. Lab # 1.0 git checkout 1.0 git log

19. Lab # 1.0 Review a. Architecture b. Main tasks c. Diﬀ d. Tricks e. Questions?

20. app runtime OS kernel app runtime OS kernel Boundary of application packaging: pros and cons traditional deployment way virtual machine

21. app runtime OS kernel app runtime OS kernel app runtime OS kernel IaC (Infra as Code) traditional deployment way IaC tools ● Chef ● Puppet ● Ansible virtual machine

22. app runtime OS kernel app runtime OS kernel app runtime OS kernel Containers as application packaging units traditional deployment way container virtual machine

23. Lab # 2.0 Docker

24. Lab # 2.0 git checkout 2.0 git log git diff --stat HEAD~1 HEAD

27. Lab # 3.0 Frontend/backend separation

30. app runtime OS kernel app runtime OS kernel app runtime OS kernel Recap: containers as application packaging units traditional deployment way container virtual machine

32. Kubernetes 4.0 - Local Kubernetes 5.0 - Conﬁguration ��

33. https://kubernetes.io/

34. Lab # 4.0 Local Kubernetes

37. Concept gaps from Docker to Kubernetes

38. Container

39. Service container service pod deployment 3

40. container service . . . └── k8s ├── todoapi-service.yml └── todofrontend-service.yml Service

41. Service container service pod deployment --- kind: Service ... --- kind: Deployment ... spec: replicas: 3 template: # pod definition spec: containers: - name: todoapi image: todoapi:3.0 k8s/todoapi-service.yml

42. service deployment --- kind: Service ... --- kind: Deployment ... spec: replicas: 3 template: # pod definition spec: containers: - name: todoapi image: todoapi:3.0 k8s/todoapi-service.yml

43. container pod --- kind: Service ... --- kind: Deployment ... spec: replicas: 3 template: # pod definition spec: containers: - name: todoapi image: todoapi:3.0

44. Container

45. Pod Container Any examples?

46. • Shared volumes • IPC • Network Multi-Container Pods in Kubernetes Pod Container Multi-container pods and container communication in Kubernetes https://www.mirantis.com/blog/multi-container-pods-and-container-communication-in-kubernetes/

47. Deployment & Replica 3

48. pod --- kind: Service ... --- kind: Deployment ... spec: replicas: 3 template: # pod definition spec: containers: - name: todoapi image: todoapi:3.0 deployment

49. Selector & label 3 The selector field defines how the Deployment finds which Pods to manage. label selector

50. service deployment --- kind: Service ... --- kind: Deployment ... spec: replicas: 3 template: # pod definition spec: containers: - name: todoapi image: todoapi:3.0

51. Service label selector 3 --- kind: Service ... --- kind: Deployment ... spec: replicas: 3 template: # pod definition spec: containers: - name: todoapi image: todoapi:3.0

52. Recap

53. Service container pod deployment service 3

54. Service container service pod deployment --- kind: Service ... --- kind: Deployment ... spec: replicas: 3 template: # pod definition spec: containers: - name: todoapi image: todoapi:3.0 k8s/todoapi-service.yml

55. pod --- kind: Service ... --- kind: Deployment ... spec: replicas: 3 template: # pod definition spec: containers: - name: todoapi image: todoapi:3.0 deployment service container

56. Kubernetes Terminology Learn by doing!

57. Make sure you’re using local Kubernetes kubectl config view kubectl config get-contexts kubectl config use-context docker-for-desktop or kubectl config use-context minikube How to use kubectl to manage multiple Kubernetes clusters https://success.docker.com/article/how-to-use-kubectl-to-manage-multiple-kubernetes-clusters

59. CAUTION ● There’s one big issue in this Lab 4.0 Can you see? ● What if a image changes but version tag remains unchanged?

60. Lab # 5.0 Conﬁguration

63. _v2 Service container pod deployment service Recap: containers as application packaging units 3

65. Cloud 6.0 - Cloud (GKE for example) 7.0 - Canary release ��

66. Lab # 6.0 Cloud (GKE for example)

69. Local/cloud diﬀ - k8s/***/conﬁg.***.yml

70. Local/cloud diﬀ - k8s/***/todoapi-service.yml

71. Local/cloud diﬀ - k8s/***/todoapi-service.yml

72. Local/cloud diﬀ - k8s/***/todofrontend-service.yml

73. Local/cloud diﬀ - k8s/***/todofrontend-service.yml

74. Skaﬀold skaffold.yaml cloud local

76. Lab # 7.0 Canary release

79. _v2 1 stable autoimage tag: 3

80. Stable/canary diﬀ - k8s/***/todoapi-***.yml

81. _v2 Service label label 1 selector stable autoimage tag: 3

83. Conclusion��

84. app runtime OS kernel app runtime OS kernel app runtime OS kernel Recap: containers as application packaging units traditional deployment way container virtual machine

85. _v2 Service container pod deployment service label label 3 selector

86. Agenda Know promising trends Adopt gradually Prepare mindset Goals Containers Kubernetes Cloud Labs 1.0 — 3.0 4.0 — 5.0 6.0 — 7.0

87. Kubernetes Terminology “Kubernetes 101: Pods, Nodes, Containers, and Clusters” • Author: Daniel Sanche • Date: 2018-01-02 • URL: https://medium.com/google-cloud/kubernetes-101-pods-nodes-c ontainers-and-clusters-c1509e409e16 (or http://bit.ly/post-k8s-101 for short)

88. Not told today Session aﬃnity https://medium.com/@diegomrtnzg/redirect-your-users-to-the-same-pod -by-using-session-affinity-on-kubernetes-baebf6a1733b StatefulSet https://godleon.github.io/blog/Kubernetes/k8s-StatefulSets-Overview / Persistent Volume & Claim https://godleon.github.io/blog/Kubernetes/k8s-PersistentVolume-Over view/

89. Next step? https://www.udemy.com/course/certified-kubernetes-application-developer/

90. Questions?

91. Attribution ● review by Alina Oleynik from the Noun Project