Prevent direct root access by setting PermitRootLogin no in /etc/ssh/sshd_config .
Securing the primary remote entry point is vital for stopping automated brute-force attacks. Linux Server Hardening
Run system updates immediately upon setup (e.g., apt update && apt upgrade for Debian/Ubuntu or dnf update for RHEL/Fedora). Prevent direct root access by setting PermitRootLogin no
The most critical step is ensuring all software is current to close known vulnerabilities. The most critical step is ensuring all software
Linux server hardening is the process of reducing a system's attack surface to protect against unauthorized access and data breaches. A default Linux installation is often a "blank canvas" rather than a fortress; hardening provides the necessary reinforcement.
Below is a structured write-up covering the essential stages of a Linux hardening project. 1. Update and Patch Management
Configure automatic security updates using tools like unattended-upgrades on Debian/Ubuntu or dnf-automatic on RHEL/Fedora. 2. Secure Access (SSH Hardening)