Linux ops automation, cloud-native, Kubernetes, SRE, DevOps, Python, Golang and related tech discussions.
This article walks through the principles of database connection pools, common causes of pool exhaustion such as leaks, mis‑configuration, slow SQL and DB limits, and provides a step‑by‑step methodology with monitoring, thread‑stack analysis, and concrete configuration and SQL optimizations to restore stability.
This guide presents a systematic, step‑by‑step methodology for troubleshooting large‑language‑model services, covering how to identify and resolve timeout, rate‑limiting, and out‑of‑memory (OOM) failures, with concrete commands, configuration examples, case studies, and monitoring recommendations.
This guide walks through the fundamentals of rsync incremental backups, explaining the delta algorithm, file comparison rules, optimal parameter choices, real‑world performance comparisons, and step‑by‑step scripts for installation, daily cron jobs, link‑dest rotation, real‑time syncing with inotify, and robust monitoring and error handling.
This comprehensive guide explains how DNS works, categorises common resolution failures, and provides step‑by‑step procedures, command‑line examples and configuration snippets for diagnosing and fixing DNS problems in Linux, Kubernetes and cloud environments.
This guide walks engineers through OpenClaw's three‑level configuration hierarchy, JSON5 format, hot‑reload modes, safe restart procedures, systemd service setup, logging, health checks, cron scheduling, memory compaction, vector search integration, Discord and Telegram bot integration, and detailed troubleshooting workflows for production deployments.
This guide explains why core Linux commands are indispensable for ops engineers, categorizes them into monitoring, networking, disk analysis, text processing and service management, and provides detailed usage examples, troubleshooting scenarios, and decision‑tree guidance for effective system administration.
This article provides a step‑by‑step, command‑driven methodology for identifying the five root causes of full disk space on Linux systems—block exhaustion, inode depletion, deleted‑but‑still‑held files, reserved space, and filesystem corruption—and offers concrete remediation techniques, automation scripts, and best‑practice recommendations.
This step‑by‑step guide explains how fail2ban monitors logs, matches brute‑force patterns, and automatically bans malicious IPs for SSH, HTTP Basic Auth, MySQL, and custom services on Ubuntu 24.04 or Rocky Linux 9.5, including installation, configuration, testing, best practices, and troubleshooting.
This article walks you through setting up a complete monitoring stack with Prometheus, node_exporter, Grafana and Alertmanager, explains how to interpret the four core dimensions—CPU, memory, disk and network—using a structured troubleshooting workflow, and provides real‑world case studies, scripts and best‑practice recommendations.
This guide explains how tcpdump, built on libpcap and the kernel BPF filter, can capture packets at the network stack, compares it with Wireshark, shows practical filtering syntax, performance considerations, typical use‑cases such as TCP retransmission, DNS timeouts and TLS handshake failures, and provides scripts and best‑practice recommendations for production‑grade troubleshooting.
