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Firewalls & IPS (Intrusion Prevention Systems)
iptables, firewalld, ufw, fail2ban, netfilter, denyhosts
FHS - Filesystem Hierarchy Standard
==================================================================================== FHS as defined by RedHat: ------------------------------------------------------------------------------------------------------------------------------------------------ /...
Admin Privileges - Sudoers
User & Group Privileges For users to have escalated privilege on a server (root access), they need to be granted this permission. sudo Users with sudo access have full administrator permissions, which means that they can essentially perform any task on th...
Linux Boot Process
The below image outlines the typical flow of a Linux system boot. 1. BIOS (Basic Input/Output System) / UEFI (Unified Extensible Firmware Interface) When the system powers on, BIOS or UEFI is the first code that runs. BIOS/UEFI are responsible for checki...
Locale, Date & Time
Locale In Linux, a locale is a set of environment variables that defines the language, country, and character encoding settings for a user's environment. Locales affect various aspects of a program's behavior, such as the way dates and times are displayed, th...
fstab & cryptab
fstab (File Systems Table) The fstab (file systems table) is a system configuration file (/etc/fstab) used to define how disk partitions, filesystems, and other storage devices should be mounted and integrated into the filesystem at boot time. Purpose of f...