Linux Administration and Production Troubleshooting

About Course

This course builds practical Linux server administration, troubleshooting, security, performance and recovery skills for working professionals. It starts with a focused Linux refresher, progresses through essential administration and concludes with realistic, evidence-based production incident investigations.

The course teaches Linux operating-system administration, not complete DevOps, SRE, Platform Engineering or Forward Deployed Engineering job responsibilities.

Inspect a Linux server and collect system health information.
Configure and troubleshoot Linux users, permissions, sudo and SSH.
Manage systemd services, processes and scheduled jobs.
Troubleshoot disk, filesystem, mounts, LVM and common NFS problems.
Diagnose DNS, routing, sockets, firewall and TLS-related connectivity failures.
Investigate CPU, memory, swap, disk I/O and process resource limitations.
Apply Linux updates and security changes using safe rollback practices.
Analyze logs, correlate evidence and write a root cause analysis (RCA).
Build and validate basic Bash scripts for Linux administration.
Investigate boot failures and verify Linux service and backup recovery.
Resolve and document a simulated multi-layer Linux production incident.

Course Content

Module 0 — Course Orientation and Linux Lab Setup

Course Introduction and Learning Objectives
Course Schedule, Learning Path and Assessments
System Requirements and Linux Lab Setup
SSH Access, Virtual Machines and Lab Snapshots
Learning Materials, Assignments and Lab Guidelines
Linux Lab Readiness Check

Module 1 — Linux Basics, Shell Commands and Server Health

Module 2 — Linux Users, Groups, Permissions and SSH

Module 3 — Linux Processes, systemd Services and Job Scheduling

Module 4 — Linux Storage, Filesystems, Mounts and LVM

Module 5 — Linux Networking, DNS, Routing and Firewalls

Module 6 — Linux Performance Troubleshooting: CPU, Memory and Disk I/O

Module 7 — Linux Package Management, Patching and Updates

Module 8 — Linux Security, SSH Hardening, sudo and SELinux

Module 9 — Linux Logs, Monitoring and Finding the Root Cause

Module 10 — Linux Web Servers and Application Troubleshooting

Module 11 — Bash Scripting and Linux Automation

Module 12 — Linux Boot, Rescue and Server Recovery

Module 13 — Linux Server Operations and Incident Management

Module 14 — Advanced Linux Troubleshooting

Module 15 — Final Capstone: Linux Production Incident Recovery

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About Course

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Course Content

Module 0 — Course Orientation and Linux Lab Setup

Course Introduction and Learning Objectives

Course Schedule, Learning Path and Assessments

System Requirements and Linux Lab Setup

SSH Access, Virtual Machines and Lab Snapshots

Learning Materials, Assignments and Lab Guidelines

Linux Lab Readiness Check

Module 1 — Linux Basics, Shell Commands and Server Health

Linux Architecture: Kernel, Shell and Distributions

Linux Filesystem Hierarchy, Files and Directories

Essential Linux Commands, Pipes and Text Processing

Check Linux System Information and Learn Basic Bash Commands

Hands-On Lab: Investigate an Unfamiliar Linux Server

Module 2 — Linux Users, Groups, Permissions and SSH

Manage Linux Users, Groups and Password Policies

File Permissions, Ownership, umask and ACLs

SSH Configuration, Key Authentication and sudo Access

Secure File Transfers using SCP, SFTP, Rsync and Tar

Hands-On Lab: Troubleshoot SSH and File Access Issues

Module 3 — Linux Processes, systemd Services and Job Scheduling

Linux Processes, Signals and Process Management

Manage Linux Services using systemctl

Troubleshoot systemd Services and Logs using journalctl

Schedule Automated Jobs using cron and systemd Timers

Hands-On Lab: Fix a Linux Service That Fails After Reboot

Module 4 — Linux Storage, Filesystems, Mounts and LVM

Linux Disks, Partitions and Filesystems

Mounting, Unmounting and Persistent Mounts using /etc/fstab

Logical Volume Management (LVM) and Filesystem Expansion

Troubleshoot Disk Space, Inodes and NFS Mount Issues

Hands-On Lab: Recover an Application Affected by Storage Failure

Module 5 — Linux Networking, DNS, Routing and Firewalls

Linux IP Addresses, Interfaces and Routing

Troubleshoot DNS and Hostname Resolution

Inspect Network Ports, Sockets and Connections

Linux Firewall Configuration and Network Traffic Analysis

Hands-On Lab: Fix a Linux Application Connectivity Issue

Module 6 — Linux Performance Troubleshooting: CPU, Memory and Disk I/O

Linux System Performance Metrics and Load Average

Troubleshoot High CPU Usage and Process Bottlenecks

Investigate Memory, Swap and Out-of-Memory (OOM) Events

Analyze Disk I/O, Open Files and Resource Limits

Hands-On Lab: Troubleshoot a Slow Linux Application

Module 7 — Linux Package Management, Patching and Updates

Manage Linux Packages and Repositories using DNF and APT

RPM, DEB Packages, Versions and Dependencies

Linux Security Updates, Kernel Patching and Maintenance Planning

Configuration Backups, Change Validation and Rollback Planning

Hands-On Lab: Recover a Linux Service After a Failed Update

Module 8 — Linux Security, SSH Hardening, sudo and SELinux

Linux Access Controls and Least-Privilege Security

SSH Hardening, sudo Policies and Secure Administration

SELinux Contexts, Policies and Access Denial Troubleshooting

Firewall Security, Linux Audit Logs and AppArmor Basics

Hands-On Lab: Restore an Application Blocked by Security Policies

Module 9 — Linux Logs, Monitoring and Finding the Root Cause

Linux System Logs and journalctl Troubleshooting

Log Rotation, Journal Management and Disk Usage

Linux Time Synchronization and Event Correlation

Root Cause Analysis (RCA) using Logs, Metrics and Change History

Hands-On Lab: Investigate an Intermittent Linux Application Failure

Module 10 — Linux Web Servers and Application Troubleshooting

Nginx, Apache, Reverse Proxies and Backend Architecture

Manage Web Servers, Application Services and Environment Configuration

Troubleshoot HTTP 502, 503 and Application Connectivity Errors

Diagnose TLS Certificates, File Permissions and Application Logs

Hands-On Lab: Restore a Failed Linux Web Application

Module 11 — Bash Scripting and Linux Automation

Bash Shell, Variables, Exit Codes and Safe Script Execution

Bash Conditions, Loops, Functions and Script Arguments

Input Validation, Error Handling and Log Processing

Automate Linux Health Checks using Bash and Job Scheduling

Hands-On Lab: Build and Troubleshoot a Linux Health-Check Script

Module 12 — Linux Boot, Rescue and Server Recovery

Linux Boot Process: BIOS/UEFI, GRUB, Kernel and initramfs

Diagnose Linux Boot Failures and systemd Targets

Linux Rescue Mode and Emergency Recovery