Cairo Kubernetes Meetup - October event Talk #2

Insights on Kubernetes networking
Engineer AbdelRahman Adel
Prepared by

Better understanding of the picture

Evolution of Services’ communication model

Update Gateway when scaling out service.
Update DNS when Gateways change.
Still need to manually:

Kubernetes Model
Pod is a collection of containers sharing the same network namespace.
Each pod has a unique IP.
Pods can be viewed more like a VM.
Pod is the atomic unit of work.

IP 1
IP 2
IP 3
IP 4
IP 5
IP 6
IP 7
IP 8
IP 9

IP 1
IP 2
IP 3
IP 4
IP 5
IP 6
IP 7
IP 8
IP 9
Destination: IP3
Destination: IP3
Destination: IP3
Destination: IP3
12
3
4

Kubernetes is responsible to deliver packet once arrived at the correct node.
BUT
Its your network’s responsibility to deliver it to the correct node

Manually Configure our network ?

IP 1
IP 2
IP 3
IP 4
IP 5
IP 6
IP 7
IP 8
IP 9
Virtual IP Real IP
IP1 Node1
IP2 Node1
IP3 Node1
IP4 Node2
IP5 Node2
IP6 Node2
IP7 Node3

Third Party Plugin
Overlay Network

Flannel Software Defined Network

IP 1
IP 2
IP 3
IP 4
IP 5
IP 6
IP 7
IP 8
IP 9
Destination: IP3
4
Destination: Node1
Destination: IP3
Destination: Node1
Destination: IP3
Destination: IP3
Destination: IP3
Flannel Flannel Flannel

Cluster on Public Cloud?
AWS VPC CNI for Kubernetes
Google Compute Engine (GCE)

IP 1
IP 2
IP 3
IP 4
IP 5
IP 6
IP 7
IP 8
IP 9
MessageHubService Message_ClusterIP
Message_ClusterIP IP 2
IP 3
IP 4
IP 3
IP 4
IP 3
IP 4

IP 1
IP 2
IP 3
IP 7
IP 8
IP 9
IP 3
IP 4
IP 3
IP 4

IP 1
IP 2
IP 3
IP 7
IP 8
IP 9
IP 3
IP 9
IP 3
IP 9

Cairo Kubernetes Meetup - October event Talk #2

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Cairo Kubernetes Meetup - October event Talk #2