Linux Firewall Configuration: UFW, iptables & firewalld Guide (2026)
Master Linux firewall configuration with UFW, iptables, nftables, and firewalld. Production-ready rules, port forwarding, NAT, and security best practices....
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....
Master Linux firewall configuration with UFW, iptables, nftables, and firewalld. Production-ready rules, port forwarding, NAT, and security best practices....
Optimize Linux server performance by tuning kernel parameters with sysctl. Covers network optimization, memory management, filesystem tuning, and security hardening settings....
Get to know Marco Rinaldi, Dargslan's cloud computing and infrastructure author. Learn about his journey from on-premises data centers to cloud architecture and his vision for modern infrastructure....
Build a comprehensive disaster recovery plan for your IT infrastructure. Covers RTO/RPO, backup strategies, failover procedures, testing protocols, and documentation templates....
Master all four major Linux firewall tools โ iptables, nftables, firewalld, and ufw. This comprehensive guide covers architecture, configuration, migration, rate limiting, NAT, port forwarding, and enterprise best practices for 2026....
Master Linux log management with journalctl and rsyslog....
Complete guide to Linux log management covering journalctl, syslog, rsyslog, logrotate, log analysis, and centralized logging solutions....
Implement effective Redis caching patterns to speed up your applications....
Comprehensive comparison of ACME (Certbot, acme.sh) and AutoInstall SSL for certificate automation. Cost analysis, feature comparison, decision flowchart, and recommendations as SSL certificate lifespans shrink to 47 days by 2029....
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.
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