Advanced Debian 13 Server Hardening: A Practical Blueprint
Deploying a Debian 13 server? Here’s a battle-tested hardening blueprint for robust, secure, and auditable servers. 1. Full System Upgrade & Minimal Install Install only what you need. Remove unneeded packages, documentation, games, and sample configs. Update everything at once: sudo apt update && sudo apt full-upgrade -y && sudo apt autoremove --purge -y 2. User & SSH Lockdown Require SSH key authentication. Disable password auth and root login. Change default SSH port and restrict by IP. Use sshguard or fail2ban for brute-force throttling. sudo nano /etc/ssh/sshd_config # Set: PermitRootLogin no PasswordAuthentication no Port 443 # Example alternative port # Allow only specific users: AllowUsers youradminuser sudo systemctl reload ssh 3. Strict Firewall Rules & Network Hardening UFW (simple) ...