This document discusses Kubernetes services and provides examples of how they work. It begins by explaining that Kubernetes services define a logical set of pods and a policy by which to access them. It then demonstrates creating Nginx and MongoDB pods and deploying ClusterIP and NodePort services to access the Nginx pods. The ClusterIP service provides an internal IP for pod to pod communication while the NodePort maps an external port to the ClusterIP for external access. The document aims to explain how Kubernetes services work at a basic level.

1. Cloud Native: Kubernetes Network
Kubernetes
Part#2
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3. • ” ”
• https://www.hwchiu.com/kubernetes-service-i.html

4. • , Kubernetes :
• Part#1 - Kubernetes
• Part#2 - Kubernetes Service Deployment Pod
• Part#3 - Kubernetes I Ingress

5. • kubectl D SDK
• T b O
tT
Provision r RBAC Quota
PSP NetworkPolicy
• e
f s
DNS g
• Kubernetes h t K
API i t
n
• t
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• Kubernetes u
CI CD Workflow
FaaS OTS ChatOps
• Kubernetes CRI CNI
CVI Cloud Provider
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6. Agenda
1. The basic knowledge of Kubernetes
Service concept
2. Demo how Kubernetes Service works
3. Summary
6

7. • Part#1
:
• Kubernetes
N
• Kubernetes
pod
pod
• podN
IP K

8. • kubernetes t
t i e , i e
t :
• s , N t
• , t IP
• r kubernetes , (Pod) o
IP K
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t u wk ( b ) g IP
K

9. • n t Kubernetes K i ,
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i , Kubernetesw iPod
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10. • t r t
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11. Kubernetes :
• Kubernetes N K
• Kubernetes N
(Service)
• (Service) N

12. Kubernetes
“Service”
12

13. • Kubernets P e m s
Deployment r l Web Server,
database,monitor
• :
• MongoDB
hs a o MongoDB tb
• MongoDB mMongoDBW
Pod Kubernetes

14. • MongoDB
Pod, Pod IP

15. • App
MongoDB MongoDB IP

16. • kubernetes
Mongo pod
pod
• pod IP P ,
• 6 1
IP ?
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17. • IP
•
• 1
• 1 DNS

18. • H Kuberntes Service
• Kuberntes Service IP

19. • Kubernetes Service w S
1. Service v T
Mongo pods
Kubernetes service v
TMongo pod IP
2. Service H FQDN
T o
App FQDN
Mongo pod App e
FQDN l T
Mongo pod Service

20. • Kubernetes Service T
kubernetes e H S ( re-try
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1. Mongo H e( Pod )
2. Kubernetes Service e Service
Mongo H
3. S S (2) kubernetes
service FQDN

21. -
• P b e i
n g IP
• Kubernetes Service Types pb s :
• ClusterIP (r )
• NodePort
• LoadBalancer
• ExternalName
• c b ClusterIP NodePort
l hb

22. • ClusterIP I / c
FQDN S
• CT c kubernetes e i
c FQDN P
kubernetes dns : IP

23. • NodePort P ClusterIP
/ Nc
• : T d NodePort
i (S e kubernetes

24. • kubernetes service FQDN
H
• e H ?
• o NodePort
lH v Port H
• LoadBalancer T
H S , cloud provider
LoadBalancer ,

25. • ClusterIP NodePort

26. P K8S App b HostApp
b
• ClusterIP: b
• NodePort: a
W
b
kubernetes b

27. Kubernetes
“Service”
27

28. • kubeDemo
ClusterIP NodePort
• https://github.com/hwchiu/kubeDemo

29. • Nginx ubuntu
I H Service Nginx

30. • Ngnix
$ kubectl create -f
https://raw.githubusercontent.com/hwchiu/kubeDemo/master/services/deployment/nginx.yml

31. • ubuntu
$ kubectl create -f
https://raw.githubusercontent.com/hwchiu/kubeDemo/master/services/application/ubuntu.yml

32. • Cluster-IP
$ kubectl create -f
https://raw.githubusercontent.com/hwchiu/kubeDemo/master/services/service/nginx-
cluster.yml

33. • I H services/service/nginx-cluster.yml
1. Type,
ClusterIP
2. service selector k8s-
nginx nginx
TCP:80
3. service k8s-nginx-cluster

34. • kubectl describe service
• Name
Namespace H
service I $Name.$Namespace
I FQDN
I I
• k8s-nginx-cluster.default

35. • Ubuntu NGINX
•

36. • ( I ) ?
• FQDN DNS H

37. • NodePort
$ kubectl create -f
https://raw.githubusercontent.com/hwchiu/kubeDemo/master/services/service/nginx-node.yml

38. • services/service/nginx-node.yml
1. Type NodePort
2. service k8s-nginx-node

39. • kubectl describe service
• H U
Name/Namespace
NodePort I
31826
TCP:31826 T
Nginx

40. • localhost:31826

41. • Kubernetes Service, Service Service
• ClusterIP NodePort
• ClusterIP/NodePort S
service Kubernetes

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