Linux Hardening Guide

Linux/Ubuntu hardening reference for 007 audit and 007 threat-model.

Covers

• SSH hardening and key-only access
• Firewall configuration and port minimization
• System updates and package hygiene
• Service reduction and least-privilege permissions
• Container and VPS hardening basics

Use When

• Auditing Linux or Ubuntu servers
• Reviewing exposed services, SSH, or firewall posture
• Hardening infrastructure before production deployment