Blog
Practical dev troubleshooting & benchmark archive.
Next.js Middleware Routing Error Solved - Real Troubleshooting Guide
How I fixed a Next.js middleware file naming issue that caused all routes to return 404 errors. Includes error logs, code analysis, and step-by-step solution.
Resolving CentOS 7 yum GPG Key Errors During Package Installation
Step-by-step guide to fixing GPG key verification errors when installing packages with yum on CentOS 7, including key import, repository configuration, and caching issues.
Recovering from 100% Disk Usage on Linux
Emergency guide to freeing disk space when Linux reaches 100% capacity, including identifying large files, cleaning logs, and emergency recovery procedures.
SSH Connection Denied: Complete Troubleshooting Guide
Comprehensive guide to diagnosing and resolving SSH connection refused and permission denied errors on Linux servers, covering all common causes.
Recovering from Accidental chmod 777 on Linux
Emergency guide to recovering from accidentally setting chmod 777 on critical system files and directories, including recursive permission restoration strategies.
Java Memory Errors on Linux: Understanding and Taming the OOM Killer
A deep dive into Linux Out-Of-Memory killer behavior with Java applications, including diagnosis, prevention, and production-grade solutions.
rsync Transfer Speed Optimization: Pushing Your Syncs to the Limit
Practical techniques to dramatically improve rsync transfer performance, from buffer tuning to algorithm selection and network optimization.
Replacing Cron with systemd Timers on Linux
How to migrate scheduled tasks from cron to systemd timers, with practical examples and comparison of both scheduling approaches.
Tracking Memory Leaks on Linux: Tools and Techniques
Practical guide to identifying and tracking memory leaks on Linux using tools like valgrind, /proc/meminfo, pmap, and AddressSanitizer.
Resolving Port Conflicts (Address Already In Use) on Linux
How to diagnose and fix 'Address already in use' errors on Linux, including finding processes using ports, SO_REUSEADDR, and proper shutdown procedures.
Transferring Large Files (4GB+) on Linux
Guide to transferring files larger than 4GB on Linux, covering filesystem limitations, rsync, split/merge, and network transfer optimization.
next.config.js Configuration Mistakes That Break Your Build
How to identify and fix common next.config.js configuration errors that cause build failures in Next.js projects
Next.js 14 App Router Migration: Troubleshooting Common Pitfalls
A comprehensive guide to resolving the most common issues encountered when migrating from Pages Router to App Router in Next.js 14
Recovering from Boot Failure After Editing /etc/fstab
Step-by-step guide to recovering a Linux system that fails to boot after incorrect /etc/fstab modifications, including live USB recovery and fstab repair.
Fixing SELinux Errors Without Disabling It
How to troubleshoot and resolve SELinux denials on Linux without disabling SELinux, using audit logs, setsebool, and proper file contexts.
Adding Swap Space on Linux: Complete Guide
How to add swap space on Linux using swap files and swap partitions, including swapon configuration and performance considerations.
Fixing nginx 502 Bad Gateway Error
Complete guide to diagnosing and resolving nginx 502 Bad Gateway errors, including upstream connection issues, timeout configurations, and PHP-FPM fixes.
Fixing Docker Daemon Startup Failures on Linux
Troubleshooting guide for Docker daemon startup failures on Linux, including daemon.json issues, storage driver problems, and network configuration errors.
PostgreSQL Connection Pool Errors on Linux: Diagnosis and Resolution
Troubleshooting PostgreSQL connection pool exhaustion, too many connections errors, and PgBouncer configuration issues on Linux servers.
Recovering Connection After iptables Rules Reset
Emergency guide to restoring network connectivity after accidentally flushing iptables rules, including console recovery and rule reconstruction.