Deconstructing Kubernetes Networking - Fundamentals and Troubleshooting

Overview

Explore the intricacies of Kubernetes networking in this 27-minute conference talk by Maheshkumar Rajarathinavel for the Cloud Native Computing Foundation. Gain insights into the fundamental components of container and Kubernetes networking, including interfaces and routing rules. Delve into key networking elements such as Kubelet, load balancers, service iptables, endpoints, and pod IPs. Learn how to assess networking environments, understand the differences between Kubenet and Azure CNI, and analyze packet flow using tools like tshark and tcpdump. Discover techniques for troubleshooting networking issues and examining application code in a Kubernetes context.

Syllabus

Intro
Kes Networking: Key Components Kubelet
K8s Networking: Key Components
Networking Components in Action
Time to dig in on a networking issue...
High Level Environment Assessment
Sidebar: Kubenet vs. Azure CNI
Walking the stack - Load Balancer
Walking the stack - Service iptables
Walking the stack - Endpoints
Walking the stack - Pod IP
Load Balancer Metrics
Packet Flow Test - tshark
Packet Flow Test - tcpdump Client
Checking for listening ports
Application Code