This article walks through a real‑world Docker logging issue, detailing how syslog and rsyslog behave inside a CentOS 7 container, the failed attempts to fix it, and the eventual discovery of missing /dev/log socket and permission constraints.
This article examines common causes of Redis data loss, walks through a real‑world incident where 90,000 keys vanished, and provides concrete monitoring, configuration, and operational safeguards to detect and avoid such failures.
An Oracle DBA recounts how a full archive log halted business, how manual deletion uncovered a backup script failure caused by a mismatched SYS password across RAC nodes, and the steps taken to fix the issue and prevent future overflow.
This article details a step‑by‑step investigation of a two‑node Oracle RAC environment where node 2 repeatedly rebooted, covering time‑synchronization checks, database and network heartbeat analysis, hardware diagnostics, and the final resolution through firmware and memory replacement.
This article walks through eight frequent Oracle RAC installation errors—ranging from shared‑disk configuration and s0 partition misuse to VIP interface issues and ASM disk reuse—providing clear command‑line fixes and configuration tips for Linux administrators.
This guide explains how to restore Oracle GoldenGate synchronization after a source‑side crash by repairing the extract service, restarting the pump process, and correcting the replicat on the target, with detailed commands and file‑selection procedures.
This guide walks through the complete installation of Oracle Enterprise Manager Grid Control 11g on Red Hat 6.4, detailing the required software packages, configuration parameters, and step‑by‑step solutions to more than a dozen encountered errors—from missing 32‑bit libraries to hostname validation, file‑descriptor limits, and agent cleanup.
This article explains what strace is, how it works via ptrace, and demonstrates its practical use in diagnosing service startup failures, process exits, shared‑memory errors, and performance bottlenecks through detailed examples and common command‑line options.
This article explains why an Oracle DBMS_JOB can become broken and show a next execution date of 4000‑01‑01, details the job parameters, the automatic retry logic, how to diagnose the underlying PL/SQL errors via alert logs, and provides concrete steps to restart and resolve the issue.
A colleague changed an Oracle application user's password, only to see the account lock every few minutes; the article walks through checking the database version, profile settings, listener logs, discovering a lingering dataSync.jar process that still used the old password, and outlines remediation steps.
This article delivers a comprehensive guide to Greenplum deployment, covering early architecture planning, data‑model design, daily maintenance best practices, system‑table management, diagnostic tools like gpcheckcat, and detailed troubleshooting techniques for persistent tables and other common issues.
This guide outlines practical steps to identify and resolve slow website issues by checking network health, optimizing front‑end resources, and tuning back‑end services such as servers, PHP, and databases, offering concrete tools and best‑practice recommendations.
This article walks through a real‑world Redis timeout problem, examining client‑side socket settings, server configuration, system metrics, and kernel TCP parameters to pinpoint why connections are dropped and how adjusting timeout and tcp‑keepalive resolves the latency.
This technical session covers Oracle RAC high‑availability best practices, installation steps, daily operational commands, detailed case studies of auto‑start checks, version‑mix issues, addNode failures, network heartbeat problems, and client connection errors, plus a concise Q&A on uninstall, SCAN vs VIP, and split‑brain detection.
This article recounts a detailed troubleshooting journey of an Oracle 11gR2 RAC cluster where a newly added node could not start with SQLPLUS due to HAIP misconfiguration and mismatched environment variables, explaining the diagnostic steps, root cause discovery, and the final resolution.
This article details seven common Oracle Listener issues—including intermittent connections, process crashes, ORA-12514, SCAN registration failures, listener hangs, TNS-12535/00505 errors, and TNS-12547 lost-contact—explaining symptoms, root causes, and step-by-step remediation commands for DBA teams.
This guide explains the Ubuntu 14.04 GitLab environment, describes the recurring 403/401 errors that affect only the office network, and provides step‑by‑step troubleshooting, configuration changes to rack‑attack, and useful references to restore stable service.
This article outlines the UIOC (Urgent Incident Office Center) process, detailing a six‑step workflow, multi‑team collaboration tactics, common troubleshooting methods, and pitfalls to avoid, helping operations teams achieve 99.99% availability while handling emergencies efficiently.
This article recounts a series of July Redis incidents—including network‑card saturation, connection‑limit exhaustion, suspected split‑brain, Bgsave‑induced OOM, and master‑restart data loss—detailing the migration to Redis Cluster with a Smart Proxy, the challenges faced, and actionable remediation strategies.
This guide explains how logrotate automatically truncates, compresses, and removes old log files, covering installation on major Linux distributions, essential configuration options, practical examples, and troubleshooting techniques to keep server storage under control.
This guide explains the two main causes of MySQL error 1040—excessive traffic and a low max_connections setting—shows how to check current and historical connection limits, and provides a rule of thumb for configuring an optimal connection threshold.
This guide explains why Linux systems report "no space left on device" or read‑only file systems, shows how to inspect disk usage, inodes, and hardware health with commands like df, du, mount, smartctl, hddtemp, and provides step‑by‑step remediation techniques such as cleaning files, compressing logs, remounting, and repairing filesystems.
When troubleshooting, you often need to isolate log entries from a precise time window; instead of cumbersome regular expressions, this guide shows how to efficiently capture nginx access logs between two timestamps with a simple awk command, illustrated with an example and a screenshot.
This guide walks through typical Nginx problems—from socket permission errors and load‑balancing weight settings to cache‑control headers, gzip configuration, high‑concurrency tuning, and debugging directives—offering step‑by‑step fixes and configuration examples for Linux environments.
