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This article walks through the most common grep, awk, and sed scenarios that sysadmins face—searching logs, extracting context, counting errors, batch‑editing files, and performing field‑based statistics—while explaining core options, pitfalls, and best‑practice workflow recommendations.
This guide walks you through a systematic, read‑only diagnostic workflow for a Linux server that becomes unresponsive, covering initial symptom clarification, data collection, CPU, memory, disk, network, application, container, and post‑mortem analysis, with concrete commands and evidence‑based decision points.
When MySQL runs out of disk space, the safest approach is to identify the full filesystem, examine data, binlog, temporary and log directories, and use SQL‑based cleanup commands like PURGE BINARY LOGS while never manually removing critical files such as ibdata1, ib_logfile* or active binlogs.
The article presents a reproducible Nginx performance‑tuning workflow that starts with defining a baseline and acceptance criteria, measures CPU, file‑descriptor, upstream and disk limits, then incrementally adjusts worker settings, systemd limits, keepalive, buffering and compression, while using gray‑scale deployment and safe rollback.
This guide explains how to systematically investigate network packet loss on Linux by collecting timestamps, routing, interface and kernel statistics, using ping, tracepath, curl, netstat, ss, nstat, ip, ethtool, nftables/iptables, and tcpdump on both ends, then narrowing the failure scope, fixing MTU, conntrack, soft‑interrupt or firewall issues, and validating the fix with metrics and roll‑back procedures.
This article provides a step‑by‑step guide on using Nginx's custom log_format together with command‑line tools such as awk, grep, sort and jq to identify slow requests, 5xx spikes, CC attacks, scanners and SQL‑injection attempts, and then mitigates them with limit_req, map, geo and iptables rules, while also covering log rotation, monitoring and risk‑aware deployment practices.
This guide catalogs the 20 most frequent mistakes made by new operations engineers, explains why they happen, and provides step‑by‑step safe alternatives, risk warnings, and recovery procedures so readers can avoid costly outages and build reliable habits.
These ten practical Bash scripts automate common sysadmin tasks—disk space checks, log rotation, resource monitoring, backup validation, process guarding, port probing, and more—providing reusable, idempotent solutions with logging, alerting, dry‑run support, and cron integration to streamline operations.
The article explains why MySQL master‑slave replication lag occurs, lists common causes, provides a five‑level troubleshooting framework, and offers three concrete recovery methods—from emergency error skipping to multi‑threaded replication and long‑term architecture improvements—plus commands, configurations, and monitoring tips.
This article walks through a real‑world contract‑review RAG project, diagnosing low recall, redesigning the system with multiple indexes, a RouterQueryEngine, re‑ranking, knowledge‑graph integration, multimodal support, incremental updates, and a rigorous evaluation framework that boosted recall from 60 % to 92 %.
