Linux Security and System Troubleshooting

Linux Security and System Troubleshooting

This course is part of RHCSA Certification Preparation Specialization

Instructor: LearnKartS

What you'll learn

Manage access with SELinux, check enforcement mode, resolve blocked access, and catch policy violations before they escalate
Configure and verify Linux firewall rules, so only the traffic you intend reaches your systems
Build skills aligned with RHCSA (EX200) certification objectives, covering the security and system recoverytasks the exam tests
Read logs toidentifyissues early and recover systems thatfail toboot, from rescue mode to a brokenfstabentry, avoiding costly downtime

Skills you'll gain

Tools you'll learn

Details to know

Shareable certificate

Add to your LinkedIn profile

Assessments

4 assignments

Taught in English

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This course is part of the RHCSA Certification Preparation Specialization

When you enroll in this course, you'll also be enrolled in this Specialization.

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There are 2 modules in this course

This course equips you with Linux security and recovery skills: locking down access with SELinux, controlling traffic with a Linux firewall, monitoring logs to catch issues early, & recovering systems that fail to boot. It's built entirely on the latest Red Hat Enterprise Linux 10 (RHEL 10) release and aligned with the RHCSA (EX200) exam objectives.

This course is rigorously hands-on. You'll observe real Linux troubleshooting and recovery work performed on an actual system, seeing exactly how each fix is applied. By the end, a blocked SELinux policy or a system that failed to boot won't feel like a crisis. You'll know exactly where to look and how to fix it; skills you'll rely on for the EX200 exam or on the job. This course is for anyone ready to secure and recover Linux systems, whether you handle these tasks at work or you're preparing for RHCSA certification. If you're comfortable with the Linux command line, file permissions, basic system administration, & networking basics, you're ready to start. Enroll today to build real Linux security and recovery skills.

This module covers Linux security fundamentals including SELinux configuration, firewall management, and access control rules. It also focuses on troubleshooting security issues and verifying system connectivity and policies.

What's included

15 videos5 readings2 assignments

15 videosTotal 41 minutes

Course Introduction3 minutes
Learning Objectives1 minute
Demo: Check SELinux status (getenforce)2 minutes
Demo: Change mode (Enforcing/Permissive)3 minutes
Demo: View 'SELinux' Contexts3 minutes
Fix common 'SELinux' Access Issues 4 minutes
Demo: Use 'semanage' Basics4 minutes
Restore contexts (restorecon)4 minutes
Learning Objectives1 minute
Demo: Check Firewall Status2 minutes
Demo: Allow services (--add-service)3 minutes
Demo: Allow ports (--add-port)2 minutes
Demo: Permanent vs runtime rules3 minutes
Reload Firewall Rules3 minutes
Verify Using SS and Connectivity Test3 minutes

5 readingsTotal 50 minutes

SELinux Modes Reference10 minutes
SELinux Context Output10 minutes
firewall-cmd Command Reference10 minutes
Permanent vs Runtime Rules Explained10 minutes
Firewall Verification Checklist10 minutes

2 assignmentsTotal 24 minutes

Proficiency Quiz12 minutes
Checkpoit Quiz12 minutes

This module focuses on system log analysis using journalctl and log files for troubleshooting issues. It also covers system recovery techniques including GRUB rescue, boot repair, password reset, and system failure resolution.