linux Archives - ITNotes

Beyond APT: A Field Guide to Snap, Flatpak, and AppImage

June 4, 2026

Dependency hell is avoidable. Learn how to use Snap, Flatpak, and AppImage to isolate your Linux applications, improve security, and ensure your production services never crash after a system update.

Linux

Reboot Linux in Seconds: Using kexec to Skip BIOS and POST

June 4, 2026

Don't let BIOS and POST cycles ruin your uptime. This guide shows you how to use kexec to reload the Linux kernel instantly, skipping the time-consuming hardware initialization phase.

Linux

Stop Guessing: Use Flame Graphs to Pinpoint Linux CPU Bottlenecks

June 4, 2026

Ditch the guesswork. Learn how to use perf and Flame Graphs to visualize Linux CPU bottlenecks and fix performance issues with precision.

Linux

Ditch GRUB for systemd-boot: A Leaner, Faster Way to Boot Linux

June 4, 2026

Tired of slow boot times and complex GRUB configurations? Learn how to switch to systemd-boot, a lightweight and modern UEFI boot manager that simplifies your setup and speeds up your Linux system.

Networking

Long-Term Network Bandwidth Monitoring with vnStat on Linux: Track, Analyze, and Export Usage Reports

June 3, 2026

vnStat is a lightweight Linux daemon that tracks network bandwidth over time — no packet capture, minimal overhead. This guide walks through installation, daemon setup, querying daily/monthly/yearly reports, and exporting data to JSON for scripts and alerts.

Linux

Debugging Linux Application Crashes with Core Dump and GDB: systemd-coredump Setup Guide

June 3, 2026

When a Linux application crashes in production, the difference between a 20-minute fix and a 3-hour investigation often comes down to whether you captured a core dump. This guide compares ulimit, systemd-coredump, and ABRT, then walks through configuring systemd-coredump and using GDB with coredumpctl for real post-crash analysis.

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.

Linux

Stop Waiting: Mastering GNU Parallel to Maximize Your Linux CPU

June 3, 2026

Stop waiting for single-threaded Bash loops. Master GNU Parallel to run tasks across all your CPU cores simultaneously, reducing processing times from hours to minutes.

Database

Valkey: Install, Configure, and Migrate from Redis After the License Change

June 2, 2026

After Redis Ltd. changed its license to SSPL in 2024, our team migrated three environments to Valkey — the Linux Foundation-backed BSD fork. Six months in, here's the full guide: installation, configuration, and proven zero-downtime migration strategies from Redis to Valkey.

Linux

Linux SUID, SGID, and Sticky Bit: Master Special Permissions for System Security

June 2, 2026

SUID, SGID, and Sticky Bit are Linux's special permission bits that control privilege elevation and file ownership inheritance. Here's how each one works internally, when to actually use them in production, and how to audit your system before someone else finds the misconfigurations.