Simplified version for EKS (1.5 hr) Kubernetes 是目前雲端環境的顯學。可是，傳統的程式，並不是原封不動搬上去，就能夠自動享受 Kubernetes 所宣稱的種種好處。 新的環境，不僅需要新的 Ops 思維，也需要新的 Dev 思維。我們將以一個半小時的時間，從軟體研發者的角度，探討軟體的設計該做哪些最起碼的改變，並體驗 Kubernetes 引進的新觀念及新效益。

1. Technical Coach
William Yeh 葉秉哲
給 RD 的 Kubernetes 初體驗
… with a series of hands-on labs
2019-09-11
EKS version

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. EKS Setup🅐
a - Redeem “Promotional Credit”
b - Set Cloud9 and credentials
c - Create EKS cluster

7. Redeem “Promotional Credit”

8. Set Cloud9 and credentials
http://bit.ly/eks-step2
Important!

9. Create EKS cluster
http://bit.ly/eks-step3
Be patient...

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. Kubernetes
4.0 - Local Kubernetes
5.0 - Configuration
��

15. https://kubernetes.io/

16. Lab # 4.0 Local Kubernetes

17. Lab # 4.0
git checkout 4.0
git log
git diff --stat HEAD~1 HEAD

18. 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

19. Concept gaps
from Docker to Kubernetes

20. Container

21. Service
container
service
pod
deployment 3

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

23. 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

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

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

26. Container

27. Pod
Container
Any examples?

28. • 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/

29. Deployment & Replica
3

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

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

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

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

34. Recap

35. Service
container
pod
deployment
service
3

36. 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

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

38. Kubernetes
Terminology
Learn by doing!

39. 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

40. Lab # 4.0 Review
a. Architecture
b. Main tasks
c. Diff
d. Tricks
e. Questions?

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

42. Lab # 5.0 Configuration

43. Lab # 5.0
git checkout 5.0
git log
git diff --stat HEAD~1 HEAD

44. 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

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

46. Lab # 5.0 Review
a. Architecture
b. Main tasks
c. Diff
d. Tricks
e. Questions?

47. Cloud
6.0 - Cloud (EKS for example)
7.0 - Canary release
��

48. Lab # 6.0 Cloud (EKS for example)

49. Lab # 6.0
git checkout 6.0
git log
git diff --stat HEAD~1 HEAD

50. 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

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

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

53. Local/cloud diff -
k8s/***/todoapi-service.yml
ID.dkr.ecr.region.amazonaws.com/todoapi

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

55. Local/cloud diff -
k8s/***/todofrontend-service.yml
ACCOUNT_ID.dkr.ecr.region.amazonaws.com/todofrontend

56. Skaffold
skaffold.yaml
cloud
local

57. Lab # 6.0 Review
a. Architecture
b. Main tasks
c. Diff
d. Tricks
e. Questions?

58. Lab # 7.0 Canary release

59. Lab # 7.0
git checkout 7.0
git log
git diff --stat HEAD~1 HEAD

60. 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

61. _v2
1
stable autoimage tag:
3

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

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

64. Lab # 7.0 Review
a. Architecture
b. Main tasks
c. Diff
d. Tricks
e. Questions?

65. Conclusion��

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

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

68. 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

69. 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)

70. 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/

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

72. Questions?

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