YUM/DNF Package History Analyzer: RHEL Admin Guide
Analyze YUM and DNF package history, track installations, and perform rollbacks with dargslan-yum-history....
Expert tutorials, guides, and tips on Linux, DevOps, and IT Administration
A focused, eight-volume curriculum that teaches absolute beginners the Linux skills that actually matter โ 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....
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 โ and a study schedule you can actually finish in twelve weeks....
Explore the complete Dargslan open-source IT ecosystem: 120 Linux PyPI packages, 119 Windows Python CLI tools, 120 PowerShell modules on PSGallery, and organized GitHub repositories. Free, professional-grade tools for sysadmins, DevOps engineers, and cybersecurity professionals....
Analyze YUM and DNF package history, track installations, and perform rollbacks with dargslan-yum-history....
Monitor XFS filesystem health, check fragmentation, and automate repairs with dargslan-xfs-check CLI tool....
The first artifact every responder asks for after a suspected breach is the login history โ who connected, from where,...
A read-only filesystem, a stale NFS mount, or a missing fstab entry can take down a service in seconds โ and the sympt...
The Linux kernel exposes hundreds of tunables under /proc/sys, and the defaults are conservative compromises designed to...
DNS resolution sits on the critical path of almost every network operation โ every HTTP request, package install, mail...
A drifting clock is one of the cruelest bugs to debug. Logs from two servers do not interleave, Kerberos tickets reject,...
The Linux audit framework is the closest thing the kernel provides to a flight recorder. Every system call, every file a...
Environment variables are the silent attack surface of every Linux server. Every running process exposes its environment...
Welcome to the Dargslan Tech Blog โ long-form, hands-on articles for engineers who run real systems in production. We publish every week on Linux administration, DevOps tooling, cloud architecture, cybersecurity, Python automation, Windows Server, and the practical day-to-day skills that separate junior sysadmins from senior platform engineers. Every post is written by working professionals, includes copy-pasteable code and configuration files, and is updated whenever upstream tools release breaking changes.
There is no shortage of tech blogs on the internet, but most fall into one of two traps: shallow listicles written by people who have never touched the tools, or 30-page corporate whitepapers designed to sell a product. Our articles sit in the middle โ long enough to actually solve your problem, short enough to read with a coffee, and always grounded in working examples you can run in your own terminal. We don't write filler, we don't gate content behind email forms, and we never publish AI-generated slop without expert review.
Our writers come from a sysadmin, SRE, and DevOps background and have shipped production systems for fintech, healthcare, telco, and SaaS companies across Europe and North America. When you read a tutorial here, you're reading what someone actually did at 2am during an incident โ not a sanitized vendor case study.
Subscribe to our RSS feed, follow the tech news section, or grab the daily IT tip for a steady stream of practical knowledge. If long-form learning is more your style, our companion eBook library covers every topic from this blog in 200-500 page depth, with downloadable code repositories and lifetime updates.