/etc/ssh/sshd_config.d/hardening.conf
Port 2222
PermitRootLogin no
PasswordAuthentication no
PubkeyAuthentication yes
MaxAuthTries 3
Infrastructure• Feb 19, 2026• 1 min read
Linux VPS Server Hardening: Professional Production Security Manual
Operational manual for securing Linux servers (Ubuntu/Debian/RHEL). Strict OpenSSH configuration, UFW/nftables firewall policies, sudoers management, and Fail2ban installation.
#linux #sysadmin #seguridad #vps #ssh #ufw #fail2ban #devops
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