Programming Tutorials

  There are few situations more frustrating in a distributed system than intermittent network failures. You check the application logs, and everything looks fine. You check the ingress controller, and you see "502 Bad Gateway." You check the pods, and they are running. Then you dig deeper. You find that your application pods are timing out while trying to resolve internal service names, or worse, your CoreDNS pods are stuck in  CrashLoopBackOff  with a cryptic log message:  [FATAL] plugin/loop: Loop detected . DNS is the circulatory system of Kubernetes. When it fails, the cluster doesn't die immediately—it degrades in agonizing, difficult-to-trace ways. This guide breaks down the root causes of CoreDNS loops and latency, and provides production-grade configurations to fix them. The Root Cause: Why CoreDNS Breaks To fix DNS, you must understand how Kubernetes handles name resolution. By default, Kubernetes deploys CoreDNS as a Deployment. When a Pod tries to reach...