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Responsible Administrator
Last Update 06/09/2026
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  • Module 1 — Linux Foundations
    9Lessons ·
    • 1.0 - What Is Linux?
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    • Lesson 2 — Linux Distributions Explained
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    • Lesson 3 — Kernel, Shell, and Userland
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    • Lesson 4 — Filesystem Hierarchy (FHS)
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    • Lesson 5 - Navigating Linux
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    • Lesson 6 — Working With Files & Directories
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    • Lesson 7 — Text Viewing Tools (cat, less, grep)
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    • Lesson 8 — File Manipulation (cp, mv, rm)
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    • Lesson 9 — Searching & Filtering (grep, find, awk)
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  • Module 2 — Linux System Administration Basics Users, permissions, processes, and system control.
    7Lessons ·
    • Lesson 1 — User & Group Management
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    • Lesson 2 — File Permissions & Ownership
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    • Lesson 3 — Sudo & Privilege Delegation
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    • Lesson 4 — Process Management (ps, top, htop)
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    • Lesson 5 — Systemd Services & Targets
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    • Lesson 6 — Scheduling Tasks (cron, crontab, at)
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    • Lesson 7 — Package Management (apt, dnf, pacman)
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  • Module 3 — Linux Networking Interfaces, routing, services, and troubleshooting.
    6Lessons ·
    • Lesson 1 — Networking Basics (ip, ping, ss, hostnamectl)
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    • Lesson 2 — Network Configuration & Interfaces
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    • Lesson 3 — DNS, Hostnames & Name Resolution
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    • Lesson 4 — Firewalls (ufw, firewalld, iptables)
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    • Lesson 5 — SSH, Remote Access & Secure Connectivity
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    • Lesson 6 — Network Troubleshooting Tools (traceroute, mtr, tcpdump)
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  • Module 4 — Storage & Filesystems
    6Lessons ·
    • Lesson 1 — Disk Devices & Partitioning (lsblk, fdisk, parted)
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    • Lesson 2 — Filesystems & Formatting (ext4, xfs, btrfs)
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    • Lesson 3 — Mounting & /etc/fstab
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    • Lesson 4 — LVM — Logical Volume Management
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    • Lesson 5 — RAID (mdadm) — Redundancy & Performance
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    • Lesson 6 — Storage Troubleshooting & Recovery
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  • Module 5 — Shell Scripting & Automation
    6Lessons ·
    • Lesson 1 — Shell Scripting Basics (Shebang, Variables, Execution, Exit Codes)
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    • Lesson 2 — Control Flow: Conditionals & Loops
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    • Lesson 3 — Functions, Arguments & Exit Status
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    • Lesson 4 — Working With Files, Text & Streams (stdin, stdout, stderr, pipes, grep, awk, sed)
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    • Lesson 5 — Automation & Scheduling (cron, at, systemd timers)
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    • Lesson 6 — Real‑World Automation Scripts (Backups, Monitoring, Deployments)
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  • Module 6 — Security & Hardening
    6Lessons ·
    • Lesson 1 — Authentication & Account Security
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    • Lesson 2 — Auditing & Logging
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    • Lesson 3 — SELinux
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    • Lesson 4 — AppArmor
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    • Lesson 5 — System Hardening & Secure Configurations
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    • Lesson 6 — Security Automation & Incident Response
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  • Module 7 — Linux Server Administration
    6Lessons ·
    • Lesson 1 — Core Server Administration & Enterprise Workflows
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    • Lesson 2 — User Directory Services (LDAP, AD Integration, SSSD)
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    • Lesson 3 — Web & Application Services
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    • Lesson 4 — Database Services (MySQL/MariaDB, PostgreSQL, Backups, Tuning)
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    • Lesson 5 — Storage & Filesystem Services (LVM, RAID, NFS, Quotas, Snapshots)
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    • Lesson 6 — Monitoring & Logging (Prometheus, Grafana, journald, log pipelines)
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  • Module 8 — Troubleshooting & Diagnostics
    8Lessons ·
    • Lesson 1 — Troubleshooting Foundations & Real‑World Diagnostic Workflow
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    • Lesson 2 — Service Troubleshooting
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    • Lesson 3 — Network Troubleshooting (DNS, routing, connectivity, firewalls)
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    • Lesson 4 — Storage Troubleshooting (disk full, I/O bottlenecks, RAID/LVM failures)
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    • Lesson 5 — Performance Troubleshooting (CPU, Memory, Load, Processes)
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    • Lesson 6 — Boot & System Recovery (GRUB, initramfs, rescue mode, broken boot fixes)
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    • Lesson 7 — Log Analysis & Incident Reconstruction
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    • Lesson 8 — Advanced Diagnostics (strace, lsof, perf, systemtap, eBPF)
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