60 articles
Kubernetes Endpoints and EndpointSlices explained from scratch — how Services use them to route traffic to pods, why empty Endpoints means no traffic reaches your app, and how to debug selector mismatches.
Debug and fix Nginx Ingress 502/504 errors caused by 'upstream connect error or disconnect/reset before headers' in Kubernetes. Step-by-step with real commands.
TCP/IP is the foundation of all internet communication. Here's a clear explanation of the layers, protocols, and why they matter for debugging network issues in DevOps.
Need to expose a local service, connect private networks, or enable zero-trust access? Compare Cloudflare Tunnel, ngrok, and Tailscale to pick the right one.
Rate limiting protects your APIs and infrastructure from overload and abuse. Here's what it is, how it works, and how to implement it in Nginx, Kubernetes, and code.
Your site hits an infinite redirect loop after adding TLS to Nginx Ingress. Here's every reason it happens and exactly how to fix each one.
Zero Trust means never trust, always verify — even inside your network. Learn the core principles, how to implement it in Kubernetes and AWS, and the tools DevOps teams actually use.
Choosing a service mesh for Kubernetes? Istio, Linkerd, and Cilium solve the same problem with very different approaches. Here's the honest comparison with real trade-offs.
By default, all pods in Kubernetes can talk to each other. Network Policies let you control exactly which pods can communicate. Here's how they work with practical examples.
Your ALB shows targets as unhealthy and traffic isn't reaching your app. Here's every reason target health checks fail and exactly how to fix each one.
Choosing between Nginx, Caddy, and HAProxy as your Kubernetes load balancer or ingress? Here's a practical comparison covering performance, configuration, TLS, and when to use each.
Envoy proxy powers Istio, AWS App Mesh, and many service meshes. Here's what it actually does, why it matters, and how it works — explained simply.
Confused about what an Ingress Controller actually does in Kubernetes? This guide explains it simply with diagrams, examples, and when to use which one.
Choosing a CNI plugin for Kubernetes? Compare Calico, Flannel, and Cilium on networking model, performance, NetworkPolicy support, and when to use each.
How do pods find each other in Kubernetes? Service discovery is the mechanism that lets services communicate without hardcoded IPs. Here's how it works, simply explained.
Your pods suddenly can't talk to each other after applying a NetworkPolicy. DNS is failing, services are unreachable, or inter-namespace traffic is blocked. Here's every cause and the exact fix.
Your ECS services can't find each other. Service Connect or Cloud Map DNS isn't resolving. Here's every cause — wrong namespace, missing IAM, wrong DNS config, VPC resolver issues — and exactly how to fix each one.
Choosing an API gateway for Kubernetes? Kong, Nginx, and Traefik each have different strengths. This comparison covers features, performance, config complexity, and which one fits your use case.
Pods can die and restart with new IPs. A Service gives them a stable address. Here's how ClusterIP, NodePort, and LoadBalancer actually work — with clear examples.
CNI is why your pods can talk to each other — but most engineers don't know how it works. Here's a plain-English explanation of CNI, plugins, and when it matters for you.
gRPC is replacing REST in microservices — but what is it and why should DevOps engineers care? Here's a plain-English explanation with Kubernetes examples.
An API Gateway sits in front of your backend services and handles auth, routing, rate limiting, and more. Here's what it actually does and when you need one.
DNS is the phonebook of the internet. Here's what it actually does, how it works step by step, and why DevOps engineers need to understand it deeply.
Getting connection timeout or upstream timed out errors through NGINX Ingress? Here's how to debug and fix timeout issues between NGINX and your backend services.
Cloudflare and CloudFront both serve as CDN and DDoS protection, but they work differently and cost differently. Here's when to use each — and when to use both.
Pod can't resolve service names or external domains? DNS failures inside Kubernetes pods are caused by CoreDNS issues, ndots config, search domains, or network policies. Here's how to debug and fix each.
SSL and TLS are everywhere — HTTPS, certificates, cert-manager, Let's Encrypt. Here's what SSL/TLS actually is, how the handshake works, what certificates do, and what you need to know as a DevOps engineer.
Your browser shows 'Access to fetch blocked by CORS policy' when loading from S3 or CloudFront. Here's every cause — missing CORS config, wrong AllowedOrigins, preflight failures — and the exact fix.
How do Docker containers talk to each other and to the outside world? Here's what Docker networking is, the difference between bridge, host, and overlay networks, and practical examples you'll use every day.
CloudFront returns 403 Forbidden but your S3 bucket or origin looks fine. Here's every cause — OAC misconfiguration, bucket policy missing, wrong origin domain, geo-restriction — and the exact fix.
Nginx and HAProxy both handle load balancing — but they work differently and excel at different things. Honest comparison of performance, configuration, health checks, observability, and when to pick each in 2026.
Webhooks are how apps talk to each other in real time — but the explanation is always confusing. Here's what a webhook actually is, how it works, how it differs from APIs, and real DevOps examples.
Linkerd vs Istio head-to-head comparison — performance, complexity, features, and which one to pick for your Kubernetes setup in 2026.
EKS pods can't connect to RDS? Fix RDS connection timeouts from Kubernetes — covers security groups, VPC peering, subnet routing, and IAM auth issues.
Reverse proxy explained simply — what it does, how it's different from a forward proxy, and why Nginx, Traefik, and AWS ALB are everywhere in DevOps.
Your Service exists but traffic isn't reaching pods. Curl times out, 502s keep coming. Here's every reason a Kubernetes Service fails to route and how to fix each one.
Kubernetes Ingress routes external HTTP/HTTPS traffic to your services. Here's what it is, how it works, and how to set one up — explained simply.
eBPF lets you run custom code inside the Linux kernel safely — without writing kernel modules or rebooting. It's why Cilium is fast, why Datadog Agent is lightweight, and why the future of Kubernetes networking looks different. Here's what it actually is.
Your ALB returns 504 Gateway Timeout but the app seems fine. Here's every reason this happens — backend timeouts, keepalive mismatches, health check failures — and exactly how to fix each one.
mTLS means both sides of a connection verify each other's identity. It's the backbone of zero-trust networking in Kubernetes service meshes. Here's how it works in plain language.
Load balancers are everywhere in DevOps — but most beginners don't fully understand how they work. Here's a clear, simple explanation with real examples.
Nginx Ingress and Traefik are the two most popular Kubernetes ingress controllers. Here's a real-world comparison to help you choose.
Getting 502 Bad Gateway from your Nginx Ingress Controller? Here's every cause and the exact fix for each one.
Service mesh sounds complicated but the concept is simple. Here's what it actually does, why teams use it, and whether you need one — explained without the buzzwords.
Fix AWS Application Load Balancer unhealthy targets. Covers health check misconfigurations, security group issues, target group problems, and EKS-specific ALB controller debugging.
Step-by-step guide to installing and configuring Istio service mesh on Kubernetes. Covers traffic management, mTLS, observability, canary deployments, and production best practices.
AI agents are the next-gen microservices, but with unpredictable communication patterns. Learn how Kubernetes networking, Gateway API, Cilium, and eBPF are adapting for agentic traffic in 2026.
Step-by-step guide to migrating from Ingress-NGINX to Kubernetes Gateway API. Includes YAML examples, implementation choices, testing strategy, and cutover plan.
Everything you need to know about Cilium, the eBPF-powered CNI for Kubernetes. Covers architecture, installation, network policies, observability with Hubble, and replacing kube-proxy.
Fix Kubernetes DNS resolution failures caused by CoreDNS misconfigurations, ndots issues, and pod DNS policies. Real troubleshooting scenarios with step-by-step solutions.
Complete guide to Kubernetes NetworkPolicies: default deny, ingress/egress rules, namespace isolation, CIDR blocks, and production patterns for zero-trust pod networking.
Step-by-step guide to installing and configuring Istio service mesh on Kubernetes — traffic management, mTLS, observability, and canary routing with practical examples.
Ingress-NGINX is officially being retired. Your ingress rules will stop working. Here's the step-by-step migration plan to Kubernetes Gateway API before it's too late.
Master Cilium — the eBPF-based CNI that's become the default for Kubernetes networking. Covers installation, network policies, Hubble observability, and service mesh mode.
Step-by-step guide to setting up Tailscale for secure access to Kubernetes clusters, databases, and internal tools without traditional VPNs.
Pods can't resolve hostnames? Getting NXDOMAIN or 'no such host' errors? Here's how to diagnose and fix CoreDNS issues in Kubernetes step by step.
Understand AWS VPC from the ground up — subnets, route tables, security groups, NACLs, VPC peering, Transit Gateway, and real-world architectures for production workloads.
Istio and Linkerd are powerful but heavy. eBPF-based networking is changing the game. Here's why I think the sidecar proxy era is ending.
The Kubernetes Ingress API is being replaced by the Gateway API. Here's a complete step-by-step guide to setting it up with Nginx Gateway Fabric and migrating from Ingress.
eBPF is quietly replacing iptables, sidecars, and monitoring agents in Kubernetes. Here's what it is, why it matters, and what it means for your career in 2026.