透過K8S的API來設計工具或應用程式 (Go版本) Kubernetes是一個強大的平台，您可以創建各種工具來跟Kubernetes結合。更幸運的是，在針對Kubernetes API進行程式開發時， Kubernetes提供了很多不同語言的client框架來使用。 本範示使用Kubernetes的Go client, 展示了Kubernetes作為平台的可擴展性。雖然此處介紹的概念可以應用於任何可以訪問Kubernetes API的語言， 但這個程式碼範例集中在Go語言上。 Youtube: https://youtu.be/L-iFa-RcyNI

1. Cloud Native: Building stuff with the Kubernetes API
K8S API
(Go client)
1

2. • 5 /
• 3 MES/SFC
• 3 ERP (SAP-MM )/EAI Leader
• 2 End-To-End Business Integration Analyst
• 1 OEM Sales Team Leader
• 4 /
• 6 /
• IT –
• 4.0 / -
erhwenkuo@gmail.com
2

3. • ”Vladimir Vivien” medium
• https://medium.com/programming-kubernetes/building-stuff-
with-the-kubernetes-api-part-4-using-go-b1d0e3c1c899

4. Agenda
1. Introduction The Kubernetes Clients
2. A simple client tool for Kubernetes
3. The Kubernetes Go Client
• Connecting to the API server
• Listing cluster PVCs
• Watching the cluster PVCs
4. Run the program
5. Summary
4

5. K8S API
5

6. • Kubernetes
: PVCWatch
• GoI

7. • Kubernetes
• Go client
• OpenAPI clients

8. • Kubernetes C Swagger
(OpenAPI)
• https://github.com/kubernetes-client/gen

9. • Go client K
• Go client K8S K
• C Kubernetes

10. ) ) ) ) ) -)( ( )
• Kubernetes Go client G KKubernetes
Kubernetes C API

11. ) ) ) ) ) -)( ( )
• api-machineryKK8s API G Kubernetes API
PT (struct) (package) C
k8s.io/kubernetes k8s.io/client-go k8s.io/apiserver
package
Kubernetes Kubernetes-
like API schema, typing,
encoding, decoding
conversion

12. ) ) ) ) ) -)( ( )
• RESTClient C api-machinery GK
REST API Kubernetes

13. ) ) ) ) ) -)( ( )
• ClientsetKG RESTClient , GP Kubernetes
T
• C API

14. K8S
14

15. • l K c A e CLI
• l PVCWatch i K8S PVC (Persistent Volume
Claim) fo, n p
• fon p l
console e mb

16. • AKubernetes :
• (connectivity)
• (resource list retrieval and walk through)
• K (object watch)
• A

17. Kubernetes
Go
17

18. • Github :
• https://github.com/kubernetes/client-go

19. •
• https://github.com/kubernetes/client-go/blob/master/INSTALL.md
• ,

20. API
(connectivity)
20

21. • Go C API P
• tools clientcmd AI

22. • I C kubeconfigA
A Kubernetes

23. • Kubernetes
CP A pod I
Kubernetes

24. • rest cluster information A

25. Create a clientset
• C API
• kubernetesA Clientset I API C

26. • IP C P A
:

27. • C PVCWatch C CoreV1 API
C clientset CoreV1 AI API
P:

28. PVCs
(resource list retrieval and
walk through)
28

29. • API C L PKubernetes API
• PVCWatch P PVC

30. • ListOptions
P LC
• C
v1.PeristentVolumeClaimList
( K8S PVC
)

31. • printPVCs
PersistentVolumeClaimList

32. PVC
(object watch)
32

33. • Kubernetes Go clientt h K8S WAPI P
c i C na ADDED
MODIFIED DELETED
• CLI K8S PVC
(Persistent Volume Claim) , usV eW
• WP l r 200Gi n
• console
• r g

34. • Watch PersistentVolumeClaim watcher
• ResultChan Go

35. •
maxClaimsQuant
totalClaimQuant
resource.Quantity K8S
SI L
PVC
• ResultChan
Watch K8S
,
channel ,
, Watch

36. • v V sn switcht K8S API e
• ADDED o PVC
• MODIFIED o PVC
• DELETED o PVC C
• i g PVC r c
totalClaims
• P c maxClaims console

38. • PVC C
P PVC

39. 39

40. • PVC
PersistentVolumeClaim

41. • ( Helm) K8S
75Gi (persistent storage claim)

42. • R pvcwatch PVC
PVC

43. • K8S PVC
redis 100Gi PVC
PVCWatch

44. 44

45. • Kubernetes
API
• https://www.slideshare.net/erhwenkuo/cncf-explore-k8sapi
• a Kubernetes Go client
CLI S (namespace) PVC
• Kubernetes Go client K8S
API a

46. 1. Building stuff with the Kubernetes API (Part 4)— Using Go
• https://medium.com/programming-kubernetes/building-stuff-with-
the-kubernetes-api-part-4-using-go-b1d0e3c1c899
2. Official Go client library for kubernetes
• https://github.com/kubernetes/client-go
3. Kubernetes Bare Metal Storage
• https://medium.com/devityoself/kubernetes-bare-metal-storage-
49b69d090dfa

47. 47
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