Linux Administration
Master Linux from the command line up — file systems, user management, networking, systemd, package management, shell scripting, and troubleshooting across RHEL, Ubuntu, and SUSE.
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Chapters
Linux Fundamentals & File System
Navigate the Linux file system, understand permissions, and manage files and directories.
User & Group Management
Create users, manage groups, configure sudo, and understand PAM authentication.
Systemd & Service Management
Manage services with systemctl, write unit files, and understand the boot process.
Networking & Firewall
Configure network interfaces, iptables/nftables, firewalld, and troubleshoot connectivity.
Package Management (apt, dnf, zypper)
Install, update, and manage packages across Ubuntu (apt), RHEL (dnf), and SUSE (zypper).
Shell Scripting Essentials
Write Bash scripts for automation — variables, loops, functions, and error handling.
Performance Troubleshooting
Diagnose CPU, memory, disk, and network bottlenecks with top, vmstat, iostat, and sar.