System Essentials

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The foundation of Linux knowledge. Understanding these concepts makes everything else click.

Overview

This section covers the core building blocks of Linux that every DevOps/SRE professional needs to understand. These aren’t just theoretical concepts—they’re the reality you interact with every time you run a command or debug an issue.

Modules

#	Module	Description	Time
1.1	Kernel & Architecture	Kernel vs userspace, modules, why containers share kernels	25-30 min
1.2	Processes & systemd	PIDs, process lifecycle, signals, systemctl, units	30-35 min
1.3	Filesystem Hierarchy	/etc, /var, /proc, /sys, inodes, mount points	25-30 min
1.4	Users & Permissions	UIDs, groups, rwx, setuid, sudo, least privilege	25-30 min

Why This Section Matters

Every single thing you do on Linux touches these concepts:

Running a container? The kernel provides process isolation
Debugging a crash? Understanding processes helps you investigate
Checking configuration? You need to know where files live
Running kubectl? Permissions determine what you can do

Prerequisites

None. This is where you start.

Key Takeaways

After completing this section, you’ll understand:

How the Linux kernel manages everything (and why containers share it)
What processes are and how they’re managed by systemd
Where everything lives in Linux (and why it’s organized that way)
How users and permissions protect systems