troubleshooting Archives

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Troubleshooting ICMP Black Holes: Fixing PMTUD in Tunneling Networks

July 27, 2026

Diagnose and resolve ICMP Black Hole issues caused by PMTUD failure. This guide explains how to use MTU adjustments and TCP MSS clamping to fix hanging VPN connections.

Linux

Linux Kdump: How to Diagnose the Kernel Panics That Standard Logs Miss

July 5, 2026

Don't let a Kernel Panic leave you in the dark. This guide shows you how to configure Kdump, reserve memory, and analyze vmcore files to find the root cause of Linux system crashes.

Linux

Why Is My Linux Load Average High Despite Low CPU Usage?

June 5, 2026

Is your Linux server lagging despite low CPU usage? Learn how to diagnose high load averages caused by I/O wait, disk saturation, and processes stuck in uninterruptible sleep.

Linux

Mastering lsof: Find Which Process is Using Your Files and Ports

June 3, 2026

Master the lsof command on Linux to troubleshoot system issues by identifying which processes are using specific files, network ports, and sockets. Learn practical tips for production environments.

Networking

Surviving ‘Neighbor Table Overflow’: Tuning Linux ARP for High-Density Networks

May 16, 2026

Is your Linux server dropping packets with 'Neighbor Table Overflow'? Fix it by tuning sysctl gc_thresh parameters for large Layer 2 and Kubernetes networks.

Linux

Demystifying the Linux Boot Process: From Power-On to Login

April 26, 2026

Ever wonder what happens between pressing the power button and the login prompt? We break down the four stages of the Linux boot process—UEFI, GRUB, Kernel, and systemd—to help you troubleshoot like a senior admin.

Linux

Advanced Linux Debugging: Hunting Silent Bugs with strace and ltrace

April 4, 2026

Master strace and ltrace to solve Linux application hangs and performance issues. Learn how to track syscalls, library calls, and identify bottlenecks with real-world examples.

Networking

Fixing 2 AM Network Outages: A Guide to CIDR Overlaps and DNS Troubleshooting

March 29, 2026

Production down at 2 AM? Manual IP math is your enemy. This guide covers a real-world troubleshooting workflow using subnet calculators and DNS tools to fix routing conflicts fast and privately.

Linux

Systemd & Systemctl: Essential Guide to Managing Services on Modern Linux

March 12, 2026

Mastering Systemd and Systemctl is crucial for any Linux engineer facing critical service outages. This tutorial demystifies service management on modern Linux, providing practical commands and a step-by-step guide to creating your own custom services. Equip yourself with the knowledge to troubleshoot effectively and maintain system stability.

Linux

How to Troubleshoot ‘Disk Full’ Error and Manage Disk Space on Linux

March 6, 2026

Linux disk full errors can crash your applications instantly. This guide walks through practical commands to diagnose disk usage, recover space fast from logs, Docker, and caches, and set up monitoring to catch problems before they escalate.