#system-administration

The Ultimate Guide to an IT Disaster Recovery Plan That Won’t Be Ignored

Picture this: It is 3:15 PM on a Friday. The air is thick with the scent of upcoming weekend freedom. Suddenly, your core web application…

Nobody Was Looking at the Wrong Number Until It Mattered

The dashboard looked perfect.

The Risk Was Visible Every Day. Nobody Recognized It.

The clue wasn’t hidden.

How to Upgrade Duo Authentication Proxy on Windows (Production Upgrade Guide)

Keeping the Duo Authentication Proxy up to date is important for security, stability, and compatibility with the latest Duo features.

Linux Hardening Çalışması Nasıl Planlanmalı?

SSH, PAM, sudo, auditd, servis sürekliliği ve SIEM görünürlüğü üzerinden pratik saha notları

The Investigation Kept Pointing in the Wrong Direction

The first clue looked convincing.

I Built an Enterprise Active Directory Lab from Scratch — Here’s Everything I Learned

From setting up my first Domain Controller to deploying software across an entire network with Group Policy, this project completely…

System users vs login users: the Linux identities behind services and scheduled jobs

A practical guide to service accounts, human accounts, and why not every Linux user is meant to log in

The Server Didn’t Fail. Our Assumptions Did.

The Linux server looked healthy.

A Beginner’s Guide to TCP and UDP

When you browse the web, watch a video, play an online game, or send a message, data travels across networks using communication protocols…

Why Every Enterprise Needs a Scalable Active Directory OU Strategy From Day One

Manual user provisioning and flat directory architectures are ticking time bombs for technical debt and orphaned access . When junior…

The Security Question I Ask Before Trusting Any Linux Server

Trust is a dangerous word in security.

SUSE Manager 4.2 to 4.3 Migration Guide: Step-by-Step Upgrade Plan for SLES Administrators

SUSE Manager 4.2 to 4.3 Migration Guide: Step-by-Step Upgrade Plan for SLES Administrators

Red Hat Satellite Upgrade Runbook: 6.16 to 6.19 Step-by-Step

Red Hat Satellite Upgrade Runbook: 6.16 to 6.19 Step-by-Step

The Breach Indicator Nobody on My Team Was Watching

Security teams spend a lot of time deciding what deserves attention.

My Number One Answer to Sysadmins Who Ask Me How to Get Started with Infrastructure as Code

When I first started moving from managing racks of on-premises servers to thinking about AWS, the advice I always received was, “Learn…

The Most Dangerous Linux Admin Is the Confident One

That title probably annoyed some people already.

Day 23 of My Cloud Engineering Journey: Getting Comfortable with Linux and the Bash Shell

Today I continued building my Linux foundation by working directly in the command line and learning more about the Bash shell.

Kurumsal Ölçekte Active Directory Mimarisi: Yönetim Standartları ve Optimizasyon

Büyük ölçekli şirketlerde BT altyapısını yönetiyorsanız, her sabah bilgisayarınızı açtığınızda arka planda devasa bir çarkın döndüğünü…

How I Fixed a Veeam Backup Error: “Target Machine Actively Refused It”

I recently ran into a strange Veeam backup error. After some trial and error, I fixed it. Here is exactly what happened and what I did.

Building Apotek Sriti: A Full-Stack Pharmacy Management Website with Inventory and POS Features

How our team designed and developed a full-stack pharmacy management system that helps customers access medicine information while…

Managing SELinux in Linux Explained for Beginners

A practical guide to understanding and managing SELinux security in Linux.

Linux Logs: The Ultimate Source of Truth for Troubleshooting

Whether you are configuring a fresh CI/CD pipeline, deploying a new cluster, or just trying to figure out why your NGINX server refuses to…

KVM Virtualization Optimization Strategies on Linux

🏁 Introduction

12 Linux Directories Every Engineer Should Understand

the best engineers don’t just memorize commands

Linux Swap Management — Part 2

🖥️ LVM Partition for Swap in Debian / RHEL

El Significado de la Descentralización (Vitalik Buterin)

Traducido y adaptado del original: https://medium.com/@VitalikButerin/the-meaning-of-decentralization-a0c92b76a274

How to Build a Zero Trust Logging Infrastructure using Confidential Consortium Framework (CCF)…

Conventional business logging systems frequently rely on perimeter security; once a log entry is received by an internal syslog aggregator…

How to Mount /dev/xvdb to /App on an Amazon EC2 Instance

A practical guide for mounting a new EBS volume, checking disk availability, and extending Linux storage

Process Management in Linux Explained for Beginners

A practical guide to monitoring and managing processes in Linux.

Linux Swap Management — Part 1

🖥️ Linux Swap Management — Part 1 📌 Fixed Partition & File-Based Swap in Debian/Linux

100+ Linux Commands and Concepts That Actually Helped Me Learn Linux

I learned Linux in a messy way — this is the cleaned-up version

Reset Windows Update: The Definitive MSP Guide to RWU

Manuel Gil’s Windows Update reset script crossed half a million downloads before he archived it in March 2023. The Dev-C++ successor —…

Zabbix on Linux: The Monitoring Setup Most SysAdmins Overlook

I’ve managed Linux servers for years, and if there’s one thing I’ve learned, it’s that monitoring is always the last thing people set up…

Modern Altyapı Yönetiminde Proaktif İzleme (Proactive Monitoring) ve Akıllı Bildirim Sistemlerinin…

Giriş ve Literatür Arka Planı

I Saved My Entire Development Environment from an Arch Linux Boot Collapse

We’ve all been there. You run a standard system update, or perhaps you’re aggressively cleaning up system directories to optimize storage…

Installing and Configuring NixOS: A Practical Beginner’s Guide

NixOS is a Linux distribution that feels a little different from distributions such as Ubuntu, Fedora, or Debian. Instead of installing…

A Structured Approach to Linux Troubleshooting

Linux troubleshooting is more than running commands or restarting services. In production environments, every action can impact…

REST API service throttling using HAProxy

In this article, we will provide a step-by-step guide for configuring traffic throttling for a REST API service.

From Sandbox to Enterprise: Building a Multi-VLAN Active Directory Lab on Proxmox

In the past, I built a standard Active Directory (AD) lab using VMware Workstation. While that setup was functional, it relied on a single…

How to Configure Supervisor, Gunicorn, and Nginx for Flask Production Applications on Linux

Configuring Supervisor on Fedora and Ubuntu for Python Production Applications

SSH Without Passwords: A Better Way to Authenticate

Linux at a Crossroads:

Arch Linux Embraces Kernel 7.0 While Grml Returns with a Debian 14 Foundation.

The Windows Concept Journey — WebDav (Web Distributed Authoring and Versioning)

WebDAV is an HTTP based protocol that transforms a web server into a collaborative network drive. Hence, allowing users to manage and edit…

VMware vSphere: Manuel VM Yedekleme Stratejileri ve vMotion Mekanizması

Veri merkezi yönetiminde yedekleme yazılımlarına erişimin kısıtlı olduğu senaryolarda veya izole ortamlarda, sanal makine (VM) verilerinin…

XenServer Ortamlarında Güvenli Altyapı Mimarisi

XenServer’da güvenlik konusu host üzerinde sonradan yapılan birkaç sıkılaştırma adımına indirgenirse, resmin büyük kısmı kaçırılır. Bu…

How to Configure a DHCP Server on Rocky Linux

Automatically assign IP addresses to clients on your network using ISC DHCP

Setting up your TELNET server on Red Hat Enterprise Linux [6.2, 7.6 and 9.8]

First Things First: What Exactly is Telnet?

Stop Fighting Your Disk. Start Forging It. A DevOps Guide to LVM

Part of my ongoing DevOps series. Previously: Flask on VPS | Grafana Reverse Proxy

Modern IT Altyapılarının Sessiz Gücü: Zabbix — Neden Hâlâ Reaktif Monitoring Kullanıyorsunuz?