The Linux skills every infrastructure engineer needs, taught without assuming you already know them. Covers the file system layout, users and permissions, systemd service management, process control, networking with ip and ss, package management across distros, shell scripting, and the small set of commands that actually solve real problems. Built as a structured series so you can work through it in order or drop into any topic on demand. Whether you are sitting an RHCSA exam, preparing for a Linux admin role, or just tired of copy pasting commands you do not understand, these guides turn reference documentation into working knowledge.
Three reliable methods to enable SSH on Raspberry Pi. Works on Pi 4, Pi 5, Pi Zero, all Pi OS versions. Includes the headless boot-partition method for setups w
Enable SSH on Raspberry Pi: 3 Methods (Pi 4, Pi 5, Headless Setup) Read More »
Step-by-step SSH setup for Ubuntu Server. Covers 22.04, 24.04, and 26.04, including the systemd socket activation change in 24.04 that breaks most older tutorials.
Enable SSH on Ubuntu Server: Complete Setup Guide (22.04, 24.04, 26.04) Read More »
You have inherited a server, taken over a project, or just need to audit who has access. The first question: who has an account on this machine? Linux stores user information in a few well-defined places. Once you know where to look, listing users, checking their groups, and managing accounts becomes straightforward. Quick Reference Task
How to List Users in Linux (and Manage User Accounts) Read More »
You have just SSH’d into a server and need to know what you are working with. Is it Ubuntu 22.04? Debian 12? CentOS Stream 9? The commands are simple but there are several options, and each reveals different information. This guide covers five methods to check your Linux distribution and version. All work over SSH,
How to Check Your Ubuntu and Linux Version (5 Quick Methods) Read More »
Built for people who are learning networking the real way: by breaking stuff, fixing it, and doing it again. From the field: I have seen engineers push a full /16 network for a single web service because it was the default in the Azure template they cloned. Understanding IP addressing is not optional — it
IP Addressing Explained: Public vs Private, Subnetting & Interview Questions Read More »
The Outage Nobody Saw Coming Disk full. Two words that have caused more production outages than most people realize. Applications crash, databases corrupt, logs stop writing—all because nobody was watching disk usage. Disk management isn’t glamorous, but it’s essential. Knowing how to check space, find what’s consuming it, and manage storage is fundamental sysadmin work.
Linux Disk Space: How to Find What’s Eating Your Storage (df, du, lsblk) Read More »
The Power Trio of Text Processing Logs, configs, and data outputs are all text. The ability to search, filter, and transform text efficiently separates those who manually copy-paste from those who process gigabytes of logs in seconds. grep finds. sed replaces. awk structures. Together, they’re an analytical powerhouse that’s been solving problems since before most
grep, sed & awk: Linux Text Processing for Sysadmins Read More »
Your Gateway to Remote Systems SSH is how you manage servers that aren’t sitting under your desk. Every cloud instance, every production server, every container host—you’ll access them through SSH. Basic SSH is connecting with a password. Production SSH means key-based authentication, secure configurations, tunnels, and jump hosts. That progression represents real career growth. SSH
SSH Essentials: Remote Administration Read More »
Logs Tell You Everything When something breaks at 2 AM, logs are your first and best source of truth. Before you start guessing, before you restart anything, before you panic—check the logs. Every process, every service, every kernel event gets logged somewhere. Knowing where to look and how to read what you find is the
Linux Log Files and journalctl Tutorial Read More »
What’s Running and How Do I Stop It? Every application, service, and script on a Linux system runs as a process. Managing processes—finding them, understanding them, and sometimes killing them—is core sysadmin work. When production is on fire and something is consuming all the CPU, you need to identify and handle it in seconds, not
Linux Process Management: ps, top, htop & kill Commands Read More »
