Networking

Прогрес лабораторних робіт Killercoda 0/4 завершено

Інтерактивні лабораторні роботи, не кількість модулів

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The network stack that powers container and Kubernetes networking.

Overview

Linux networking is the foundation for everything in Kubernetes—pod-to-pod communication, services, ingress, network policies. Understanding it helps you debug networking issues and understand how Kubernetes abstractions actually work.

Modules

#	Module	Description	Time
3.1	Module 3.1: TCP/IP Essentials	OSI model, TCP vs UDP, subnetting, routing	80–110 min
3.2	Module 3.2: DNS in Linux	resolv.conf, dig, DNS debugging	80–110 min
3.3	Module 3.3: Network Namespaces & veth	veth pairs, bridges, pod networking	140–170 min
3.4	Module 3.4: iptables & netfilter	Packet filtering, NAT, kube-proxy internals	80–110 min

These are planning estimates copied from the four module headers, not measured learner completion times. Their arithmetic gives an aggregate range of 380–500 minutes (about 6 hours 20 minutes–8 hours 20 minutes); individual setup, reading, and practice time will vary.

Why This Section Matters

Almost every Kubernetes issue eventually involves networking:

Pod can’t reach service? Understand routing and iptables
DNS resolution failing? Know how Linux resolves names
Network policy not working? Understand how netfilter works
Performance issues? Could be network namespace or iptables overhead

Prerequisites

System Essentials — Processes, filesystem
Container Primitives — Namespaces concept

Key Takeaways

After completing this section, you’ll understand:

How TCP/IP works and how to troubleshoot connectivity
How Linux resolves DNS and why containers have DNS issues
How network namespaces create isolated network stacks (pod networking)
How iptables/netfilter powers Kubernetes services and policies