APT Package History: Tracking Linux Package Changes and Security Updates
Knowing what packages were installed, upgraded, or removed -- and when -- is essential for troubleshooting, security aud...
Linux Tutorials
Guides and tutorials for Linux system administration
Linux Crontab Backup: Export, Restore, and Diff Your Cron Jobs
"crontab -r" is the most dangerous keystroke combination in Unix. One letter from the harmless -l, it deletes your entir...
Linux Network Interface Monitoring: Link Status, Traffic, and Error Detection
Network interfaces fail in subtle ways: a single dropped packet per million, a half-megabit of CRC errors, an interface ...
YUM/DNF Package History Analyzer: RHEL Admin Guide
Analyze YUM and DNF package history, track installations, and perform rollbacks with dargslan-yum-history....
io_uring Explained: The Future of Linux I/O Performance in 2026
io_uring is the most significant change to Linux I/O in over a decade and is now the default high-performance interface for everything from databases to web servers. This deep dive explains how the ring-buffer model actually works, real benchmarks against epoll for typical workloads, the workloads where io_uring genuinely transforms performance, the kernel-security history that has shaped its evolution, and the realistic adoption story for application developers in 2026....
Linux Kernel 6.10: New Features Every Sysadmin Should Know in 2026
Linux Kernel 6.10 ships with bcachefs going production-ready, the sched_ext pluggable scheduler, faster io_uring, and tightened security defaults. Here is what every sysadmin and DevOps engineer needs to know before rolling it out in 2026 — what changed, what broke, and what to test on staging first....
Meet Nico Brandt: The DevOps and Linux Automation Expert Behind 12 Dargslan Titles
Get to know Nico Brandt, the systems engineer and author behind some of Dargslan's most popular DevOps and Linux automation books. Learn about his background, writing philosophy, and practical approach to IT education....
Linux Essentials: The Complete 8-Volume Beginner Guide (2026 Edition)
A focused, eight-volume curriculum that teaches absolute beginners the Linux skills that actually matter — the command line, files, scripts, packages, networking, monitoring, security, and the daily work of administration. One volume per concept, in order, with no jargon and no detours....
Linux Zero to Hero: The Complete 2026 Learning Roadmap (8 Books, 1 Path)
A practical, opinionated 2026 roadmap to take you from "I have never opened a terminal" to "I run hardened Linux servers in production." Eight books, three stages, one straight line — and a study schedule you can actually finish in twelve weeks....