Linux ops automation, cloud-native, Kubernetes, SRE, DevOps, Python, Golang and related tech discussions.
This article provides a detailed, packet‑by‑packet walkthrough of TCP's three‑way handshake and four‑step connection termination, explains the TCP header fields, explores TIME_WAIT issues, compares BBR and Cubic congestion control, and offers practical Wireshark and tcpdump techniques for troubleshooting and interview preparation.
This comprehensive guide explains Istio’s sidecar architecture, traffic management, mutual TLS security, and observability features, then walks through prerequisite checks, installation with istioctl and Helm, sample Bookinfo deployment, advanced configuration, troubleshooting, monitoring, and backup strategies for production‑grade service meshes.
When iowait jumps to 80% and commands stall, this guide walks through the Linux I/O stack, explains key iostat metrics, and shows how to pinpoint offending processes with iotop, then uses blktrace, btt, fio, and bpftrace to diagnose and tune storage performance.
This article provides a step‑by‑step, production‑ready guide to building a complete Linux logging pipeline using rsyslog, systemd‑journald, and logrotate, covering architecture, configuration, performance tuning, security hardening, troubleshooting, monitoring, backup, and recovery for CentOS 7/8 and Ubuntu 20.04/22.04 environments.
A comprehensive, step‑by‑step guide that explains the most common Kubernetes failure scenarios—from pod crashes and image pull errors to node NotReady and API server timeouts—provides concrete kubectl commands, diagnostic scripts, real‑world case studies, best‑practice recommendations, monitoring metrics, and backup‑restore procedures to keep production clusters healthy.
This guide explains how to write Dockerfiles that dramatically reduce image size, speed up builds, and improve security by leveraging layer caching, multi‑stage builds, BuildKit features, proper base‑image selection, and CI/CD integration, with concrete examples for Node.js, Python, Go, and Java projects.
This article presents a systematic, USE‑methodology‑based workflow for diagnosing Linux performance issues, covering CPU, memory, disk I/O and network bottlenecks with step‑by‑step commands, detailed examples, scripts, case studies, best‑practice recommendations and monitoring guidelines.
This guide walks you through every step of Docker container deployment, covering installation, environment requirements, daemon configuration, Dockerfile best practices, multi‑stage builds, Compose orchestration, security hardening, resource limits, monitoring, troubleshooting, and production‑grade recommendations to ensure reliable, scalable services.
This article explains the Linux zombie and orphan process mechanisms, why kill -9 cannot terminate zombies, how to detect them with ps, top and /proc, and provides practical cleanup methods—including sending SIGCHLD to the parent, killing the parent, batch scripts, container‑specific solutions like tini, and preventive coding techniques—plus systemd handling and monitoring with Prometheus.
This guide explains why Linux's rm command doesn't truly erase data, describes the two recovery windows (process‑held and un‑overwritten blocks), and walks through three practical recovery methods—using /proc FDs, ext4‑specific tools, and generic carving utilities—while also offering prevention strategies such as trash‑cli, snapshots, and robust backup practices.
