Linux Hardening

Baseline hardening steps for a Linux host: locking down the boot process, encrypting data at rest, restricting network exposure, securing remote access, minimizing account privilege, keeping packages current, and making sure the system actually logs what happens on it.

Topic	Description
Physical Security	Password-protecting GRUB so the boot process can't be abused for unauthorized root access.
File-System Partitioning & Encryption	Full-disk encryption with LUKS.
Firewall	Checking exposed ports with ufw.
Remote Access & SSH Hardening	Defending against password sniffing/guessing and moving to key-based SSH authentication.
Securing User Accounts	sudoers, disabling root login, and disabling unused accounts.
Update & Upgrade Policies	Keeping packages current on Debian-based and RHEL-based distributions.
Audit & Log Configuration	Where Linux keeps its logs, and how to search them quickly.