This guide shows how to use nsenter to enter a container's network namespace for debugging, log into Kubernetes nodes via privileged pods, deploy a DaemonSet for persistent access, and compare nsenter with the newer kubectl debug temporary container approach.
This article introduces kubectl‑debug, a powerful kubectl plugin that launches a sidecar debugging container sharing the target pod's namespaces, enabling on‑the‑fly use of familiar tools like netstat, tcpdump, and iftop without bloating the original image, and provides installation steps, usage examples, and advanced configuration options for efficient Kubernetes pod troubleshooting.
This guide explains how to troubleshoot Kubernetes workloads using the new kubectl debug command, covering the setup of EphemeralContainers, feature‑gate configuration, process‑namespace sharing, node debugging, and practical code examples for handling hard‑to‑debug pods.
The Kubernetes 1.20 release, the final version of 2020, introduces 42 enhancements—including 11 stable, 15 beta, and 16 alpha features—covering storage snapshot stability, kubectl debug, API priority and fairness, dual‑stack IPv4/IPv6, PID limits, graceful node shutdown, dockershim deprecation, and exec probe timeout fixes.
