Systems

Notes on Linux systems administration, kernel internals, and system-level concepts.

Core Topics

System Fundamentals

• Linux Kernel Boot Process
• Common Files and Directories
• Devices
• Disks
• File Systems
• Groups
• Hashing
• Hard and Soft Links
• LVM (Logical Volume Manager)
• Memory
• Memory Management
• Networking
• Network Manager
• Permissions
• Processes
• Storage
• Time
• Users and User Management

System Services and Configuration

• Systemd
• PAM (Pluggable Authentication Modules)
• Logging
• Scheduled Tasks
• Bash Startup Files

Development and Tools

• Development Tools
• Make
• Linux Commands

System Internals

• Kernel
• Interrupts
• System Calls
• Key-Value Stores

Observability and Troubleshooting

• Observability Sources
• Per-Process Analysis
• System-Wide Analysis
• Troubleshooting

Subdirectories

Bash

Shell scripting and bash-specific notes

• Bash Notes
• Keyboard Shortcuts

Commands

Detailed documentation for specific Linux commands

• chgrp
• chmod
• chown
• dd
• groups
• ip
• Job Control
• kill
• lsscsi
• passwd
• ps
• umask

Greybeard Qualification

Advanced Linux system administration topics

• Block Devices and File Systems
• Memory Management
• Process Execution and Scheduling
• Process Structure and IPC
• Startup and Init