Linux

Learn how to secure Linux servers with Fail2Ban using a clear, step-by-step guide for beginners. Improve server security, block brute-force attacks, and configure Fail2Ban for SSH and common services.

Learn practical sysctl settings to boost Linux server performance safely. Step-by-step tips for beginners to tune networking, memory, and kernel parameters.

Learn how to use fsck to check and repair disk errors on Linux with step-by-step commands and safety tips for beginners. Covers mounting, backups, common flags, and recovery best practices.

Learn how to view and manage Linux processes and background jobs using ps and kill. Step-by-step commands, examples, and safety tips for beginners and DevOps practitioners.

Resolve GRUB boot issues on Linux with clear, beginner-friendly steps, common fixes, and recovery tips. Follow simple commands and rescue-mode guidance to safely restore your bootloader.

Learn step-by-step how to set up strong password policies on Linux systems, including PAM, /etc/login.defs, and password aging. Ideal for Linux and DevOps beginners who want to secure user accounts quickly.

Understand the Linux file system hierarchy—what /, /etc, /var, /usr and home contain—explained for Linux and DevOps beginners. Learn navigation, permissions, and practical tips to manage systems confidently.

Short introduction: The Linux file system hierarchy organizes files and directories so

Learn how to set up and manage multiple Linux users with sudo permissions safely and efficiently. Includes examples and commands (visudo, sudoers), group controls and best practices for Linux and DevOps beginners.

Learn how to set up a basic firewall with iptables on Linux, step-by-step for beginners. Secure servers and manage traffic with clear, practical DevOps tips.

Learn how to mount and unmount drives in Linux with clear, step-by-step commands and examples for beginners. Includes mounting filesystems, USB drives, and safe unmount tips.

Learn how to configure a swap file on Linux with a clear, step-by-step guide for beginners. Includes creation, activation, sizing tips, and best practices for DevOps newcomers.