Kubernetes Concepts

Step-by-step explanations, real-world issues, and simplified understanding. Master every angle — from foundational concepts to real-world troubleshooting.

What we cover

Configuring Ingress Controllers with NGINX for Production TrafficDebugging Kubernetes Networking with kubectl and CNI PluginsKubernetes Network Policies for Pod-Level Traffic ControlImplementing Kubernetes Deployment Strategies - Rolling, Blue-Green, and CanaryConfiguring Kubernetes Resource Requests, Limits, and QoS ClassesUnderstanding Kubernetes Service Types — ClusterIP, NodePort, and LoadBalancerImplementing Kubernetes Pod Security Standards and securityContextMonitoring Kubernetes with Prometheus and Grafana

8 Subtopics

Interactive guides & progressions

13 Articles

In-depth technical readings

52 Glossary Terms

Platform terminology defined

3 FAQs

Common questions answered

Kubernetes Networking and Traffic Management

Master Kubernetes networking — Services, Ingress, DNS, CNI plugins, and Network Policies that control how traffic flows inside and into your cluster.

Networking is the foundation of every Kubernetes cluster — and the most common source of production incidents. A wrong Service selector, a missing NetworkPolicy, or a misconfigured Ingress can silently break traffic for thousands of users. This pillar covers the networking primitives that engineers at Swiggy, Razorpay, and Hotstar use to route, secure, and debug traffic across their Kubernetes clusters.

What This Pillar Covers

Kubernetes Service types — ClusterIP, NodePort, LoadBalancer, and ExternalName
Ingress controllers with NGINX for production HTTP and HTTPS routing
CoreDNS and service discovery — how pod-to-service DNS resolution works
Network Policies for pod-level traffic isolation between namespaces and teams
CNI plugins — Calico, Cilium, and Flannel for pod networking
Debugging networking failures with kubectl and CNI diagnostics

Who This Is For

DevOps engineers, platform engineers, and backend developers who need to configure reliable service-to-service communication, expose applications to the internet, and diagnose networking failures in production Kubernetes clusters.

Learning Progression

Configuring Ingress Controllers with NGINX for Production Traffic

Configure NGINX Ingress Controllers on Kubernetes to route production HTTP and HTTPS traffic with SSL termination, path routing, and rate limiting.

Debugging Kubernetes Networking with kubectl and CNI Plugins

Diagnose and fix Kubernetes pod networking failures, DNS resolution issues, and CNI plugin misconfigurations using kubectl, netshoot, and network policy debugging tools.

Kubernetes Network Policies for Pod-Level Traffic Control

By default, every pod in a Kubernetes cluster can talk to every other pod — regardless of namespace, team, or sensitivity. Network Policies are Kubernetes firewall rules that restrict this. They define which pods are allowed to send traffic to which other pods, and which external IPs can reach your services. Without them, a compromised frontend pod can directly connect to your production database.

Implementing Kubernetes Deployment Strategies - Rolling, Blue-Green, and Canary

Learn how to deploy new application versions to Kubernetes with zero downtime using rolling updates, blue-green switching, and canary traffic splitting.

Configuring Kubernetes Resource Requests, Limits, and QoS Classes

Learn how to correctly set CPU and memory requests and limits on Kubernetes pods to prevent OOMKills, CPU throttling, and noisy neighbour problems in production.

Understanding Kubernetes Service Types — ClusterIP, NodePort, and LoadBalancer

Master all Kubernetes Service types — ClusterIP for internal traffic, NodePort for node-level access, and LoadBalancer for production external exposure with real examples.

Implementing Kubernetes Pod Security Standards and securityContext

Secure Kubernetes pods using Pod Security Standards, securityContext settings, and runtime controls that prevent privilege escalation and container breakout attacks.

Monitoring Kubernetes with Prometheus and Grafana

Set up a complete Kubernetes monitoring stack with Prometheus for metrics collection, Grafana for dashboards, and Alertmanager for notifications to Slack and PagerDuty.

Related Technical Guides

Written guides that show you how to apply this concept in real projects.

Guide5 min read

Velero vs etcd Snapshot: Not a Real Choice

Velero and etcd snapshots protect different layers of a cluster, not the same thing. Here's what each covers and why production DR needs both.

Read Guide

Guide5 min read

Istio Ambient vs Linkerd in 2026

Istio Ambient killed the sidecar-tax argument. The real 2026 decision is waypoint topology and Buoyant's licensing shift, not features vs simplicity.

Read Guide

Guide5 min read

Nginx Ingress vs Traefik vs Gateway API in 2026

Ingress-nginx retired in March 2026. Here's how Traefik and the Gateway API actually compare as replacements — and why "just swap it" is the wrong frame.

Read Guide

Vocabulary & Terms

Key words used in this concept - explained simply, no jargon.

Namespace

A Kubernetes mechanism for partitioning cluster resources into isolated virtual segments. Namespaces allow multiple teams, projects, or environments to share the same physical cluster while maintaining logical separation of workloads, access controls, and resource quotas. They do not provide network isolation by themselves — that requires Network Policies.

Ingress

An API object that manages external HTTP and HTTPS access to services inside a cluster. Ingress sits in front of multiple services and acts as a smart router — directing traffic based on hostnames, URL paths, or headers without exposing each service directly to the internet.

CrashLoopBackOff

A Kubernetes pod status indicating the container repeatedly crashes immediately after starting and the kubelet applies exponential backoff delays before each restart attempt, beginning at 10 seconds and capping at 5 minutes. It signals that something inside the container is fundamentally broken - not a transient network issue.

Kubelet

The primary node agent in Kubernetes that runs on every worker node, responsible for ensuring containers described in PodSpecs are running, healthy, and reporting status back to the control plane.

Frequently Asked Questions

What does the Kubernetes Networking and Traffic Management concept cover?

Kubernetes Networking and Traffic Management covers a variety of key topic guides, including: Configuring Ingress Controllers with NGINX for Production Traffic, Debugging Kubernetes Networking with kubectl and CNI Plugins, Kubernetes Network Policies for Pod-Level Traffic Control, Implementing Kubernetes Deployment Strategies - Rolling, Blue-Green, and Canary, Configuring Kubernetes Resource Requests, Limits, and QoS Classes, Understanding Kubernetes Service Types — ClusterIP, NodePort, and LoadBalancer, Implementing Kubernetes Pod Security Standards and securityContext, Monitoring Kubernetes with Prometheus and Grafana. Master Kubernetes networking — Services, Ingress, DNS, CNI plugins, and Network Policies that control how traffic flows inside and into your cluster.

How does Kubernetes Networking and Traffic Management relate to the Kubernetes hub?

Kubernetes Networking and Traffic Management is a core learning conceptual pillar mapped within the Kubernetes engineering hub of the DevOps Network.

Are these DevOps concepts free to learn?

Yes, all lessons, visual roadmaps, and guides on DevOps Network are 100% free with no paywalls or sign-up gates for learning content.

Back to Kubernetes Hub