[Kubernetes] Node architecture with service

Rex Chiang

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Apr 6, 2022

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Kubelet

• Take responsibility for pods management and communication with master node.
• If Kubelet receive order from master node, it will create pods.

Kube-Proxy

• Kube-Proxy updates the latest information of pods to iptables, and ensure pods can be accessed by other objects in cluster.
• Kube-Proxy generates iptables rules to control routing inside a cluster.
• If pods are created, Kube-Proxy will update these pods information to iptables.

Load Balancing

• Load balancer service acts as a traffic controller, routing client requests to the nodes capable of serving them quickly and efficiently.
• If there have external requests, Load Balancing take responsibility for delivering requests to specific node.

iptables

• iptables control and filter network traffic through the Linux firewall.
• According to the rules Kube-Proxy generated, traffic is directed to an end location.
• When nodes receive requests, iptables will take responsibility for delivering requests to specific pod.