Linux Administration & Basics
Practical guides on Debian/Ubuntu setup, file permissions, systemd services, resource monitoring, and downloadable cheatsheets.
Basics • Setup
Initial Ubuntu & Debian Server Configuration
System updates, timezone setup, creating a non-root sudo user, and essential CLI utilities.
Basics • Files
Files, Permissions & Archives (chmod, chown, tar)
Understanding octal permissions, recursive ownership changes, and searching files with find/grep.
Systemd • Logs
Managing Services & Reading journalctl Logs
Controlling daemons with systemctl, writing custom unit files, and vacuuming old journal logs.
Monitoring
CPU, Memory & Disk Space Diagnostics
Quickly finding large directories, checking RAM/swap pressure, and inspecting active processes.
Security
Hardening OpenSSH & Configuring UFW Firewall
Key-based authentication, disabling root password login, and basic inbound firewall rules.
Downloads
Cheatsheets & Configuration Templates
Download plain-text command references, systemd unit templates, and setup scripts.