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ryukyagamilight
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hardening

Harden Linux systems with SSH, sysctl, user, and file security configurations.

1|Updated Jan 31, 2026
Search Tags:#security#linux#ssh#hardening#cis#sysctl
One-click install
npx skills add https://github.com/ryukyagamilight/terminal-skills --skill hardening-ryukyagamilight
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: hardening
Source: https://github.com/ryukyagamilight/terminal-skills/tree/main/security/hardening
Command: npx skills add https://github.com/ryukyagamilight/terminal-skills --skill hardening-ryukyagamilight

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill addresses the critical need for robust system security by providing comprehensive guidance and commands for hardening operating systems against common vulnerabilities.

Core Features & Use Cases

  • SSH Hardening: Secure remote access by disabling root login, enforcing key-based authentication, and changing default ports.
  • Kernel Parameter Tuning: Optimize network and system parameters for enhanced security using sysctl.
  • User Security: Implement strong password policies, account lockout mechanisms, and manage user privileges effectively.
  • File Permissions: Ensure critical system files and directories have appropriate, restrictive permissions.
  • Service Management: Disable unnecessary services and restrict cron job access.
  • Use Case: A system administrator needs to quickly apply security best practices to a newly deployed Linux server to meet compliance requirements and reduce its attack surface.

Quick Start

Apply SSH hardening by disabling root login and password authentication.

Frequently Asked Questions about hardening

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I harden SSH configurations on a Linux server?▼

To harden SSH on a Linux server, disable direct root login, enforce key-based authentication, and change default ports. This reduces remote access attack surfaces and aligns configurations with established security best practices.

What Linux sysctl parameters should I tune for network security?▼

Tuning sysctl parameters optimizes network and system settings for enhanced security. You can apply kernel parameter tuning to restrict unnecessary network behaviors and align system states with security benchmarks like CIS.

How do I apply CIS benchmark compliance to a newly deployed Linux environment?▼

You can apply CIS benchmark compliance by executing comprehensive system hardening procedures. This includes managing user account security, setting restrictive file permissions, and disabling unnecessary services to meet compliance requirements.

What is the best way to implement user account lockout policies in Linux?▼

Implementing user account lockout policies involves configuring strong password rules and account lockout mechanisms. This effectively manages user privileges and secures authentication pathways against brute force attacks.

How do I restrict cron job access and disable unnecessary services for system hardening?▼

Service hardening restricts cron job access and disables unnecessary services to minimize vulnerabilities. This shrinks the system's attack surface by ensuring only essential, explicitly authorized processes run.

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