Linux Hostname and DNS Resolution: FQDN, Reverse DNS, and Network Identity
An incorrectly set hostname is a quiet bug that breaks email delivery, SSL certificate validation, monitoring agent regi...
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....
An incorrectly set hostname is a quiet bug that breaks email delivery, SSL certificate validation, monitoring agent regi...
SELinux provides mandatory access control that goes beyond traditional file permissions. When properly configured, SELin...
Log files grow silently until they fill your disk and crash your services. Proactive log monitoring -- tracking sizes, g...
Managing user sessions is a critical security and operational task. Knowing who is logged in, what they are doing, and h...
Mount points are the foundation of Linux filesystem access, yet many sysadmins overlook mount monitoring until a stale N...
Process management is a daily task for Linux sysadmins. Zombie processes, runaway CPU consumers, and memory-hogging appl...
Network latency directly impacts application performance, user experience, and service reliability. Whether you are diag...
Monitoring login activity is a fundamental security practice. Every SSH session, failed authentication attempt, and susp...
Disk quotas prevent individual users or groups from consuming excessive storage on shared Linux systems. Without quotas,...
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.