Ubuntu Server Hardening — Part 1: The Essentials
Three measures every public Ubuntu server needs immediately: a default-deny UFW firewall, Fail2ban brute-force protection, and automatic security updates.
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Hardening
2 articles
Ubuntu Server Hardening — Part 2: Tightening the System
The second hardening pass: tuning kernel parameters with sysctl, disabling attack surface you do not use, and restricting sudo and local login policies.
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