Hardening Ubuntu servers is essential for production security. This checklist covers all critical security configurations from SSH to kernel hardening.

Why Harden Ubuntu Servers?

Server hardening provides:

  • Reduced Attack Surface: Minimize vulnerabilities
  • Compliance: Meet security standards like CIS, PCI DSS
  • Protection: Prevent unauthorized access
  • Monitoring: Detect and respond to threats
  • Stability: Prevent service disruptions

Hardening Checklist

Essential security steps:

  1. SSH Security: Disable root login, use key auth
  2. Firewall: Configure UFW or iptables
  3. Updates: Enable automatic security updates
  4. User Accounts: Remove unused, set strong passwords
  5. Filesystem: Configure permissions and mount options

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