Troubleshooting – ITFROMZERO – Share tobe shared!

MySQL Error Log and General Query Log: Production Troubleshooting Techniques for Sysadmins

By admin July 11, 2026

Learn how to configure MySQL Error Log and General Query Log for rapid system diagnostics. Practical insights on log management and production debugging.

VMware

Handling APD and PDL Errors in VMware vSphere: Understanding and Resolving All Paths Down and Permanent Device Loss

By admin June 28, 2026

APD and PDL are two types of serious storage failures in VMware vSphere that present with similar symptoms but require completely different remediation approaches. This article walks through how to distinguish, diagnose, and resolve each condition using CLI and PowerCLI — based on real-world experience managing an 8-host ESXi cluster.

Centos

How to Use sosreport on CentOS Stream 9: Collect and Analyze System Information for Professional Troubleshooting

By admin June 20, 2026

sosreport is Red Hat's official tool for collecting complete system information with a single command, replacing the need to run dozens of manual commands every time an incident occurs. This article compares different approaches to information gathering, weighs their pros and cons, and walks through a practical sosreport deployment on CentOS Stream 9 — including a script you can integrate directly into your incident response workflow.

MySQL

Fixing MySQL Connection Errors: From 1045 to ‘Too Many Connections’ – Real-World Stories and Solutions

By admin June 20, 2026

Fix MySQL errors 1045, 2002, and Too Many Connections with hands-on, real-world guidance. Learn how to accurately diagnose problems and optimize database connections based on practical experience.

Linux

Mastering chroot on Linux: From Sandbox Isolation to Real-World System Rescue

By admin May 18, 2026

Discover how to use chroot for application isolation and Linux boot rescue. A practical guide to mastering your system without the need for complex Docker or VM setups.

VMware

Fixing the ‘The virtual machine is in use’ Error: How to Handle .lck Files to Rescue VMware VMs

By admin May 18, 2026

Is your VMware VM showing 'The virtual machine is in use' and causing stress? Check out this guide on safely deleting .lck files to unlock your VM on Workstation and ESXi.

Linux

Mastering lsof on Linux: Pro Tips for Finding Processes Occupying Ports and Fixing ‘Too Many Open Files’ Errors

By admin May 14, 2026

Linux users shouldn't miss out on lsof for monitoring file descriptors and fixing 'Too many open files' errors. Check out 5 real-world troubleshooting tips from a system expert.

Docker

Docker Containers Shutting Down Slowly and Zombie Process Errors: A Complete Fix with Tini

By admin May 5, 2026

Docker containers hanging during shutdown? Discover how to use Tini to resolve Zombie Processes and Signal Handling, making your apps more stable and professional.

Linux

How to Use strace to Debug Applications on Linux: Tracing System Calls and Finding Root Causes Effectively

By admin April 28, 2026

strace lets you trace every system call a process makes on Linux — from file opens and network connections to lock waits — without needing source code or recompiling. This guide covers practical strace usage for debugging permission errors, missing files, hanging services, and I/O bottlenecks.

VMware

Diagnosing VMware ESXi with esxtop: A Practical Troubleshooting Field Guide

By admin April 28, 2026

Stop guessing and start diagnosing. Use esxtop to accurately identify CPU Ready, RAM Swap, and Disk Latency bottlenecks on VMware ESXi like a seasoned systems engineer.