Description:

This course covers advanced techniques for securing a Linux server by hardening its configuration. You will learn how to minimize security risks by implementing strict SSH access controls, managing granular sudo privileges, and mastering log analysis across different distributions like Ubuntu and CentOS.

Key Highlights:
 

• SSH Hardening: Moving beyond passwords to key-based authentication.
• Privilege Management: Mastering the sudoers file and the visudo command.
• Proactive Monitoring: Analyzing authentication logs and system journals.
• Multi-Distro Management: Securing both Debian-based (apt) and RHEL-based (dnf) environments.

What you will learn:

• Master SSH Defense Secure your perimeter by disabling root logins and implementing SSH Key-based authentication through hands-on key-matching exercises.
• Enforce Privilege Control Master /etc/sudoers syntax and use "The Auditor" workflow to identify security holes like unauthorized NOPASSWD permissions.
• Analyze Logs & Services Use grep and journalctl to hunt for threats in system logs and utilize netstat or ss to identify and close risky network services.
• Execute Security Audits Lock down a live VM in a "Virtual Terminal" simulation and verify your hardening success using a comprehensive Security Scorecard.