kubernetes service with high availability

1. Kubernetes
Service with High Availability
1

2. Me
 鄭偉聖, Sam Zheng
 CS student in NCTU
 Intern in National Center for High-performance
Computing (NCHC)
 Intern in Industrial Technology Research Institute
(ITRI)
 Familiar with OpenStack, Docker and Kubernetes
 kweisamx.cs05g@g2.nctu.edu.tw
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3. Kubernetes Networking
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4. 4

5. 5

6. How do we to export the service IP to public
network on bare metel?
 In kubernetes we have some existed solution
 NodePort
 CloudProvider Load Balancer
 Ingress
 But it is enough?
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7. NodePort
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kubeProxy kubeProxy kubeProxy
NodePort NodePort NodePort
Pod Pod Pod

8. NodePort
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kubeProxy kubeProxy kubeProxy
NodePort NodePort NodePort
Pod Pod Pod

9. Load Balancer
 Cloud Provider e.g. AWS , GCP, OpenStack
 Load Balancer is created by Cloud Provider, and provide
the external IP to for service
 But it is only for Cloud Provider, the bare metal cannot
do this
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10. Load Balancer
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kubeProxy kubeProxy kubeProxy
NodePort NodePort NodePort
Cloud
LoadBalancer
Pod Pod Pod

11. 11

12. Ingress
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 HTTP Load Balancing
 SSL Termination
 Content-base Rourting
 Not fully for external network

13. Ingress
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Ingress
nginx.com echoheaders.com
ServiceA ServiceB
10.0.0.1:80

14. Ingress
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Ingress
Controller
Ingress
Resource
Load Balancer
watches configure

15. Ingress
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kubeProxy
kubeProxy kubeProxy
Pod PodPodPod PodPod
Momo.foo.com
Jojo.foo.com
yoyo.foo.com
hostnetwork

16. Ingress
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kubeProxy
kubeProxy kubeProxy
Pod PodPodPod PodPod
DNS

17. 17

18. Keep-Alived VIP
 Real High-Availability
 Virtual IP Address
 IP to Service
 Configmap
 DaemonSet
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Ref :
- https://github.com/kubernetes/contrib/tree/master/keepalived-vip

19. Keep-Alived VIP
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kubeProxy kubeProxy kubeProxy
Pod PodPod
Keepalived Keepalived Keepalived
140.113.1.1 140.113.1.2 140.113.1.3
Vip: 140.113.1.50

20. Keep-Alived VIP
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kubeProxy kubeProxy kubeProxy
PodPodPod
Keepalived Keepalived Keepalived
140.113.1.1 140.113.1.2 140.113.1.3
Vip: 140.113.1.50
Pod

21. Keep-Alived VIP
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kubeProxy kubeProxy kubeProxy
PodPodPod
Keepalived Keepalived Keepalived
140.113.1.1 140.113.1.2 140.113.1.3
Vip: 140.113.1.50

22. 22

23. Keep-Alived VIP + Ingress
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kubeProxy kubeProxy kubeProxy
PodPod Pod
Keepalived Keepalived Keepalived
140.113.1.1 140.113.1.2 140.113.1.3
Vip: 140.113.1.50
Momo.foo.com
ojo.foo.com

24. Summary
 Just have fun or Test – NodePort
 Using Cloud to build your kubernetes – Cloud Load
Balancer
 Using DNS to provide your service – Ingress
 VIP – keepalived-VIP
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