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Architects' Tech Alliance
Architects' Tech Alliance
Feb 11, 2019 · Fundamentals

Understanding Power over Ethernet (PoE): Principles, Advantages, Deployment, Troubleshooting, and Design Guidelines

This article provides a comprehensive overview of Power over Ethernet (PoE), covering its definition, mid‑span and end‑span power delivery methods, operational workflow, advantages, troubleshooting tips, distance calculations, switch power considerations, stability factors, and best‑practice recommendations for network and security deployments.

DeploymentPoEPower over Ethernet
0 likes · 15 min read
Understanding Power over Ethernet (PoE): Principles, Advantages, Deployment, Troubleshooting, and Design Guidelines
MaGe Linux Operations
MaGe Linux Operations
Jan 23, 2019 · Operations

Mastering tcpdump: Practical Commands for Network Packet Capture

This guide explains how to use tcpdump for network packet capture, covering basic commands, filtering by interface, host, port, protocol, advanced examples, saving captures to files, and a practical troubleshooting scenario involving Nginx and a Node.js server.

LinuxNetwork MonitoringPacket Capture
0 likes · 8 min read
Mastering tcpdump: Practical Commands for Network Packet Capture
ITPUB
ITPUB
Jan 3, 2019 · Operations

How to Quickly Pinpoint High CPU Usage in Java Services on Linux

When a data platform server spikes to 98% CPU despite low traffic, this guide walks you through using Linux tools and Java thread analysis to locate the offending process, identify the problematic code, and apply a targeted fix that drops CPU load dramatically.

CPUJavaLinux
0 likes · 7 min read
How to Quickly Pinpoint High CPU Usage in Java Services on Linux
MaGe Linux Operations
MaGe Linux Operations
Dec 28, 2018 · Operations

Master Linux Network Management with the Powerful ip Command

This guide explains how to install iproute2, use the ip command to configure IP addresses, manage routing tables, monitor network statistics, handle ARP entries, and troubleshoot Linux networking, providing clear examples and command-line snippets for system administrators.

Linuxip commandiproute2
0 likes · 6 min read
Master Linux Network Management with the Powerful ip Command
JD Tech
JD Tech
Dec 13, 2018 · Operations

Monitoring Puppet Configuration Management: Workflow, Metrics, and Troubleshooting

This article explains how to monitor the Puppet configuration management system, covering its request‑response‑execution‑report workflow, key monitoring metrics, black‑box and white‑box monitoring approaches, common issues, and practical solutions for ensuring large‑scale cluster consistency.

Configuration ManagementOperationsPuppet
0 likes · 8 min read
Monitoring Puppet Configuration Management: Workflow, Metrics, and Troubleshooting
21CTO
21CTO
Nov 14, 2018 · Operations

Master Linux Performance: From 5W2H Methodology to Flame Graphs

This comprehensive guide explains how to diagnose Linux performance issues using a structured 5W2H approach, introduces essential monitoring tools for CPU, memory, disk I/O, and network, and demonstrates practical flame‑graph techniques—including on‑CPU, off‑CPU, memory, and differential analyses—to quickly locate and resolve bottlenecks.

flamegraphmonitoringperformance
0 likes · 20 min read
Master Linux Performance: From 5W2H Methodology to Flame Graphs
Java Backend Technology
Java Backend Technology
Nov 5, 2018 · Databases

Top 10 MySQL Errors Every DBA Should Know and How to Fix Them

This article presents ten classic MySQL error scenarios—from connection limits and replication conflicts to permission issues and timeout settings—explaining their causes, illustrating them with screenshots, and offering concrete configuration tweaks and procedural steps to resolve each problem efficiently.

Database ErrorsSQLServer Configuration
0 likes · 9 min read
Top 10 MySQL Errors Every DBA Should Know and How to Fix Them
360 Tech Engineering
360 Tech Engineering
Oct 12, 2018 · Mobile Development

Fixing Xcode 10 Simulator Launch Failure on macOS Mojave

This guide explains how to resolve the Xcode 10 simulator launch hang on macOS Mojave by backing up, removing, and restoring Xcode's PlugIns folder, along with additional steps such as checking the scheme and resetting the simulator.

SimulatorXcodeiOS development
0 likes · 4 min read
Fixing Xcode 10 Simulator Launch Failure on macOS Mojave
Efficient Ops
Efficient Ops
Sep 6, 2018 · Operations

Top 10 Linux Ops Troubleshooting Tips Every Sysadmin Should Know

This article compiles ten common Linux operational problems—from shell script failures and cron output issues to disk space leaks and MySQL storage errors—detailing their causes and step‑by‑step solutions to help engineers quickly diagnose and resolve system faults.

LinuxShellSysadmin
0 likes · 12 min read
Top 10 Linux Ops Troubleshooting Tips Every Sysadmin Should Know
Alibaba Cloud Developer
Alibaba Cloud Developer
Aug 7, 2018 · Fundamentals

Why Does Ping Fail? From Theory to Real‑World Network Troubleshooting

This article walks through fundamental networking concepts such as routing tables, ifconfig, and ARP, demonstrates how a ping request is processed across subnets and gateways, shows real‑world packet captures, and explains how a misconfigured HSRP caused intermittent connectivity issues, offering practical troubleshooting steps.

ARPNetworkingping
0 likes · 16 min read
Why Does Ping Fail? From Theory to Real‑World Network Troubleshooting
Java Captain
Java Captain
May 24, 2018 · Big Data

Debugging a Kafka Data Drop: A Step‑by‑Step Troubleshooting Case Study

After a recent feature release caused a sharp decline in a key data metric, the team followed a systematic, fourteen‑step troubleshooting process—including verification, code review, DBA involvement, local debugging, environment comparison, logging, packet capture, service restarts, request mode changes, load testing, and partition resizing—to identify and resolve a Kafka‑related throughput bottleneck.

KafkaLoad TestingPerformance debugging
0 likes · 8 min read
Debugging a Kafka Data Drop: A Step‑by‑Step Troubleshooting Case Study
MaGe Linux Operations
MaGe Linux Operations
May 6, 2018 · Operations

6 Common Linux Ops Issues and How to Diagnose & Fix Them

Learn a systematic Linux troubleshooting workflow and detailed solutions for six typical operational problems—including filesystem corruption, disk space exhaustion, inode depletion, lingering deleted files, too‑many‑open‑files errors, and read‑only filesystem issues—complete with command‑line examples and step‑by‑step fixes.

FilesystemLinuxOperations
0 likes · 13 min read
6 Common Linux Ops Issues and How to Diagnose & Fix Them
ITPUB
ITPUB
Apr 16, 2018 · Databases

Why Do Oracle DBMS_JOBS Show a 4000‑01‑01 Next Date? Debugging Stuck Jobs

This guide explains why an Oracle DBMS_JOB can end up with a next execution date of 4000‑01‑01, how to interpret its status fields, diagnose the underlying errors, and restore the job using manual execution and log‑based troubleshooting steps.

DBMS_JOBSDatabase AdministrationJob Scheduling
0 likes · 5 min read
Why Do Oracle DBMS_JOBS Show a 4000‑01‑01 Next Date? Debugging Stuck Jobs
Huawei Cloud Developer Alliance
Huawei Cloud Developer Alliance
Mar 28, 2018 · Mobile Development

Why Does MotionPro VPN Drop on Android? Common Causes and Fixes

The article opens with Confucius' teachings on knowledge and inquiry, then presents a developer's issue where MotionPro VPN disconnects on Android, outlines two main causes—lack of app trust and background cleaning by phone managers—and provides clear steps to whitelist the app and reinstall it with trust enabled.

AndroidMobile DevelopmentVPN
0 likes · 3 min read
Why Does MotionPro VPN Drop on Android? Common Causes and Fixes
Tencent Cloud Developer
Tencent Cloud Developer
Mar 21, 2018 · Databases

Understanding MySQL Thread Pool: Architecture, Configuration, and Common Issues

The article explains MySQL’s thread‑pool technology—its motivation, architecture of listener, worker, timer threads and priority queues, key configuration variables, how to enable it, and common pitfalls such as memory leaks, monitoring timeouts, and group‑level saturation, offering practical guidance for DBAs.

ConfigurationDatabase Performancemysql
0 likes · 17 min read
Understanding MySQL Thread Pool: Architecture, Configuration, and Common Issues
Senior Brother's Insights
Senior Brother's Insights
Mar 17, 2018 · Blockchain

Why Does Ethereum Sync Stall? Common Issues and Fixes

This guide compiles the most frequent Ethereum synchronization problems—such as blocks lagging by dozens, the sync process stalling at 99%, zero block height or balance readings, and abnormal logs—and provides step‑by‑step commands, hardware tips, cache settings, and log‑analysis techniques to diagnose and resolve them.

BlockchainEthereumNode
0 likes · 9 min read
Why Does Ethereum Sync Stall? Common Issues and Fixes
MaGe Linux Operations
MaGe Linux Operations
Mar 1, 2018 · Operations

Top 10 Linux Ops Troubleshooting Tips Every Sysadmin Should Know

An experienced Linux sysadmin shares a curated list of common operational issues—from shell script execution failures and cron output overload to disk space leaks, MySQL storage pitfalls, and network latency—detailing root causes, step‑by‑step diagnostics, and practical solutions to keep servers running smoothly.

LinuxOperationsShell
0 likes · 15 min read
Top 10 Linux Ops Troubleshooting Tips Every Sysadmin Should Know
Qunar Tech Salon
Qunar Tech Salon
Feb 27, 2018 · Big Data

Root Cause Analysis of Kafka Consumer Group Coordinator Failure and __consumer_offsets Compaction Issues

The article investigates a Kafka cluster outage where several brokers became unavailable and consumers could not join groups, explains the role of __consumer_offsets, analyzes the coordinator selection logic, identifies a stuck loadGroupsForPartition operation and compact thread failure, and documents the recovery steps taken.

Log CompactionOFFSETconsumer-group
0 likes · 11 min read
Root Cause Analysis of Kafka Consumer Group Coordinator Failure and __consumer_offsets Compaction Issues
MaGe Linux Operations
MaGe Linux Operations
Feb 5, 2018 · Operations

6 Common Linux Ops Issues and How to Fix Them Quickly

This article presents a systematic troubleshooting workflow for Linux operations engineers, covering six typical problems—including filesystem corruption, disk‑space exhaustion, inode depletion, deleted files that still occupy space, too many open files, and read‑only filesystems—along with concrete commands and solutions to resolve each issue.

FilesystemLinuxOperations
0 likes · 13 min read
6 Common Linux Ops Issues and How to Fix Them Quickly
Vipshop Quality Engineering
Vipshop Quality Engineering
Jan 17, 2018 · Backend Development

Why Zookeeper Connections Fail After 1 MB and How to Fix Them

A staging environment’s new scheduled task kept failing due to Zookeeper disconnections caused by packets exceeding the default 1 MB maxBuffer, and the article explains the root cause, heartbeat timing, and how adjusting Djute.maxbuffer or upgrading Zookeeper resolves the issue.

BackendDistributed SystemsZooKeeper
0 likes · 4 min read
Why Zookeeper Connections Fail After 1 MB and How to Fix Them
Efficient Ops
Efficient Ops
Jan 11, 2018 · Operations

Mastering Incident Troubleshooting: Proven SRE Strategies for Operations

This article shares practical SRE‑based principles for diagnosing and resolving online incidents, emphasizing systematic investigation, gathering clues, and prioritizing service restoration over immediate root‑cause identification to make troubleshooting less mystical and more effective.

OperationsSREincident management
0 likes · 7 min read
Mastering Incident Troubleshooting: Proven SRE Strategies for Operations
ITPUB
ITPUB
Dec 21, 2017 · Operations

Master Linux Troubleshooting: 6 Common Issues and How to Fix Them

Learn a systematic approach for Linux system administrators to diagnose and resolve six typical problems—including filesystem errors, 'argument list too long', inode exhaustion, undeleted file space, too many open files, and read‑only filesystem—using command‑line tools, log analysis, and practical fixes.

FilesystemLinuxOperations
0 likes · 15 min read
Master Linux Troubleshooting: 6 Common Issues and How to Fix Them
StarRing Big Data Open Lab
StarRing Big Data Open Lab
Nov 10, 2017 · Operations

Top 16 Common TDH Community Edition Installation Issues and How to Fix Them

This guide compiles the most frequent problems encountered when installing the TDH Community Edition—such as hostname configuration, logical volume creation errors, service startup failures, firewall settings, and license issues—and provides clear step‑by‑step solutions to help users avoid and resolve these obstacles.

InstallationLinuxOperations
0 likes · 10 min read
Top 16 Common TDH Community Edition Installation Issues and How to Fix Them
ITPUB
ITPUB
Oct 13, 2017 · Operations

Rescue a Broken Linux Boot: Single‑User Mode, GRUB Fixes & Recovery Steps

This guide walks through Linux boot failure troubleshooting, covering single‑user mode, common GRUB misconfigurations, disk‑sector errors, and step‑by‑step recovery using rescue mode, with concrete commands and examples for each scenario.

GRUBSystem Administrationboot
0 likes · 14 min read
Rescue a Broken Linux Boot: Single‑User Mode, GRUB Fixes & Recovery Steps
21CTO
21CTO
Aug 30, 2017 · Databases

9 Classic MySQL Errors and How to Fix Them

This article presents nine classic MySQL error cases—from connection limits and replication conflicts to installation permission issues, forgotten passwords, auto‑increment resets, character‑set garbling, binlog misconfiguration, timeout problems, and file‑open limits—each accompanied by clear diagnosis steps and practical solutions.

Character SetDatabase ErrorsPermissions
0 likes · 16 min read
9 Classic MySQL Errors and How to Fix Them
MaGe Linux Operations
MaGe Linux Operations
Aug 17, 2017 · Databases

Top 10 MySQL Errors Every DBA Should Know and How to Fix Them

This article compiles ten classic MySQL error scenarios—from connection limits and replication conflicts to charset issues and file‑open limits—explaining the root causes, diagnostic commands, and step‑by‑step solutions so beginners and seasoned DBAs can troubleshoot confidently.

CharsetDatabase ErrorsReplication
0 likes · 16 min read
Top 10 MySQL Errors Every DBA Should Know and How to Fix Them
dbaplus Community
dbaplus Community
Aug 2, 2017 · Databases

Top 10 MySQL Error Cases and How to Fix Them

This article lists ten classic MySQL error scenarios—from connection limits and replication conflicts to startup failures and charset issues—explaining each problem, showing the exact error output, and providing step‑by‑step commands and configuration tweaks to resolve them.

Database ErrorsSQLmysql
0 likes · 17 min read
Top 10 MySQL Error Cases and How to Fix Them
dbaplus Community
dbaplus Community
Jun 12, 2017 · Databases

How to Diagnose and Fix MySQL Replication Errors in UDB

This guide explains how to collect replication status, analyze MySQL error logs and binary logs, compare master and slave configurations, and troubleshoot common replication failures such as GTID mismatches, missing binlogs, and conflicting statements in UDB environments.

GTIDReplicationUDB
0 likes · 20 min read
How to Diagnose and Fix MySQL Replication Errors in UDB
dbaplus Community
dbaplus Community
May 31, 2017 · Operations

Why Docker Hosts Crashed: Tracing Kernel Null‑Pointer Bugs and the Fix

The article recounts a half‑year investigation of a high‑performance proxy cluster whose Docker hosts repeatedly crashed due to kernel null‑pointer dereferences, detailing log analysis, three faulty hypotheses, extensive web research, kernel and Docker upgrades, and the final operational lessons learned.

DockerKernel upgradeLinux kernel
0 likes · 14 min read
Why Docker Hosts Crashed: Tracing Kernel Null‑Pointer Bugs and the Fix
MaGe Linux Operations
MaGe Linux Operations
Apr 20, 2017 · Operations

10 Lazy Sysadmin Tricks to Boost Linux Efficiency in Minutes

This article presents ten practical Linux system‑administration tricks—from unmounting a stuck DVD and recovering a frozen screen to using SSH tunnels for VNC, resetting root passwords, measuring bandwidth with iperf, and gathering system information—each designed to save time and improve efficiency for busy administrators.

SSHVNCperformance
0 likes · 20 min read
10 Lazy Sysadmin Tricks to Boost Linux Efficiency in Minutes
ITPUB
ITPUB
Apr 4, 2017 · Operations

Real‑World Ops Pitfalls and Proven Ways to Avoid Them

This article compiles practical experiences from system administrators about common operational pitfalls, their root causes, and concrete mitigation steps, ranging from misconfigured HAProxy timeouts and risky rm commands to ansible async quirks and cron‑job failures.

AnsibleDevOpsLinux
0 likes · 8 min read
Real‑World Ops Pitfalls and Proven Ways to Avoid Them
ITPUB
ITPUB
Mar 6, 2017 · Databases

Why MySQL Source Fails with ASCII '\0' and How to Resolve It

The article explains the MySQL source command error caused by an ASCII '\0' character, describes the purpose of the --binary-mode option, shows why the null byte is disallowed in text mode, and provides a reproducible example with code and command‑line steps to fix the issue.

ASCIIErrorNUL byte
0 likes · 5 min read
Why MySQL Source Fails with ASCII '\0' and How to Resolve It
Efficient Ops
Efficient Ops
Feb 16, 2017 · Operations

Why a Missed DNS Renewal Shut Down Our Site—and How We Fixed It

A detailed post‑mortem recounts how a forgotten domain renewal caused a DNS outage, the frantic troubleshooting steps across teams, temporary work‑arounds like switching to Google DNS, and the lessons learned for future incident management.

DNSdomain managementincident response
0 likes · 13 min read
Why a Missed DNS Renewal Shut Down Our Site—and How We Fixed It
转转QA
转转QA
Feb 13, 2017 · Databases

Redis Connection Pool Saturation: A Debugging Tale

A developer recounts how a Redis connection pool overflow across dozens of clusters was traced to a single misbehaving service, diagnosed with netstat and ps commands, and resolved by adjusting configuration and stopping the offending process, illustrating practical troubleshooting of connection limits.

Connection PoolOperationsmonitoring
0 likes · 4 min read
Redis Connection Pool Saturation: A Debugging Tale
dbaplus Community
dbaplus Community
Nov 22, 2016 · Databases

Mastering SQL Server Deadlock Monitoring: Tools, Queries, and Extended Events

This guide explains why SQL Server monitoring is essential, lists the critical metrics to watch, defines deadlocks, and provides multiple methods—including Performance Monitor, trace flags, Profiler, Extended Events, and the system_health session—along with step‑by‑step instructions and sample queries to detect and analyze deadlocks effectively.

Database AdministrationDeadlock MonitoringExtended Events
0 likes · 16 min read
Mastering SQL Server Deadlock Monitoring: Tools, Queries, and Extended Events
Efficient Ops
Efficient Ops
Oct 29, 2016 · Databases

Why Your System Slows Down: Uncover Hidden Database Bottlenecks

The article explains how unnoticed database issues often cause system slowness, outlines key diagnostic questions for operations teams, and presents a three‑step approach—discover, solve, prevent—to regularly health‑check and optimize databases for reliable performance.

Operationsdatabasesmonitoring
0 likes · 8 min read
Why Your System Slows Down: Uncover Hidden Database Bottlenecks
360 Zhihui Cloud Developer
360 Zhihui Cloud Developer
Oct 14, 2016 · Operations

Mastering Rapid Incident Response: An Ops Engineer’s 4‑Step Method

This guide teaches operations engineers a four‑step “Wang‑Wen‑Wen‑Qie” methodology—observing system health, listening via alerts, questioning changes, and pulse‑checking with profiling tools—to rapidly diagnose and resolve high‑impact incidents while maintaining clear communication and post‑mortem learning.

Operationsincident responsemonitoring
0 likes · 5 min read
Mastering Rapid Incident Response: An Ops Engineer’s 4‑Step Method
ITPUB
ITPUB
Aug 21, 2016 · Backend Development

How to Diagnose and Prevent Redis Data Loss in Production

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.

BackendData lossOperations
0 likes · 11 min read
How to Diagnose and Prevent Redis Data Loss in Production
Efficient Ops
Efficient Ops
Jul 17, 2016 · Operations

Why Oracle RAC Node Reboots Repeatedly? Time Sync, Heartbeats & Hardware Fixes

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.

RACdatabasetroubleshooting
0 likes · 7 min read
Why Oracle RAC Node Reboots Repeatedly? Time Sync, Heartbeats & Hardware Fixes
ITPUB
ITPUB
Jul 14, 2016 · Databases

How to Resolve Common Oracle RAC Installation Errors: A Step‑by‑Step Guide

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.

InstallationLinuxOracle
0 likes · 9 min read
How to Resolve Common Oracle RAC Installation Errors: A Step‑by‑Step Guide
ITPUB
ITPUB
Jul 14, 2016 · Databases

Recovering Oracle GoldenGate After a Source Crash: Step‑by‑Step Fixes

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.

ExtractOracle GoldenGatePump
0 likes · 5 min read
Recovering Oracle GoldenGate After a Source Crash: Step‑by‑Step Fixes
ITPUB
ITPUB
Jul 5, 2016 · Databases

How to Overcome 18 Common Pitfalls When Installing Oracle Enterprise Manager Grid Control 11g

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.

Enterprise ManagerGrid ControlInstallation
0 likes · 18 min read
How to Overcome 18 Common Pitfalls When Installing Oracle Enterprise Manager Grid Control 11g
ITPUB
ITPUB
May 23, 2016 · Databases

Why Do Oracle DBMS_JOBS Stop at the Year 4000? Root Cause and Fix

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.

Alert LogDBMS_JOBJob Scheduling
0 likes · 6 min read
Why Do Oracle DBMS_JOBS Stop at the Year 4000? Root Cause and Fix
ITPUB
ITPUB
Mar 28, 2016 · Databases

Why Did My Oracle User Keep Getting Locked? A Step‑by‑Step Investigation

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.

Listener LogOracleRAC
0 likes · 10 min read
Why Did My Oracle User Keep Getting Locked? A Step‑by‑Step Investigation
dbaplus Community
dbaplus Community
Feb 22, 2016 · Databases

Mastering Greenplum: Planning, Data Modeling, and Daily Ops Best Practices

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.

GreenplumMPPSystem Tables
0 likes · 13 min read
Mastering Greenplum: Planning, Data Modeling, and Daily Ops Best Practices
ITPUB
ITPUB
Jan 8, 2016 · Databases

Mastering Oracle RAC: Best Practices, Common Pitfalls, and Real-World Cases

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.

InstallationOracleRAC
0 likes · 21 min read
Mastering Oracle RAC: Best Practices, Common Pitfalls, and Real-World Cases
dbaplus Community
dbaplus Community
Dec 22, 2015 · Databases

How to Diagnose and Fix Common Oracle Listener Errors

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.

Error CodesOracleTNS
0 likes · 10 min read
How to Diagnose and Fix Common Oracle Listener Errors
MaGe Linux Operations
MaGe Linux Operations
Nov 16, 2015 · Operations

How to Resolve Intermittent 403 Errors in GitLab on Ubuntu 14.04

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.

403 errorGitLabrack-attack
0 likes · 7 min read
How to Resolve Intermittent 403 Errors in GitLab on Ubuntu 14.04
Efficient Ops
Efficient Ops
Oct 12, 2015 · Operations

Redis Cluster Migration Lessons: Real‑World Failures and Practical Solutions

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.

ClusterOperationsSmart Proxy
0 likes · 13 min read
Redis Cluster Migration Lessons: Real‑World Failures and Practical Solutions
MaGe Linux Operations
MaGe Linux Operations
Dec 2, 2014 · Operations

How to Diagnose and Fix Disk‑Full, Read‑Only, and Inode Issues on Linux

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.

FilesystemLinuxOperations
0 likes · 11 min read
How to Diagnose and Fix Disk‑Full, Read‑Only, and Inode Issues on Linux
MaGe Linux Operations
MaGe Linux Operations
Jun 30, 2014 · Backend Development

Common Nginx Issues and Solutions: Startup Errors, Load Balancing, Caching, and Performance Tuning

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.

Cache-Controltroubleshooting
0 likes · 16 min read
Common Nginx Issues and Solutions: Startup Errors, Load Balancing, Caching, and Performance Tuning