Red Hat Linux Troubleshooting (RH 242)

Course Information

Duration: 4 days

Version: RH 242

Price: $3,200.00



Learning Credits:


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In Red Hat Linux Troubleshooting (RH242), system administrators will learn techniques for troubleshooting a Linux system and how to use the troubleshooting tools available on Red Hat Enterprise Linux 6.  It is a heavily lab-oriented class designed to help the student learn or improve troubleshooting skills. Students will gain troubleshooting experience by debugging live, virtualized systems.


  • Red Hat System Administration I and II or Red Hat Certified System Administrator (RHCSA) Rapid Track Course
  • RHCSA certification holder or equivalent experience
  • Have system administration knowledge under Red Hat Enterprise Linux, including:
    • Installation
    • Service management (using service and chkconfig, for example)
    • Basic system monitoring (using ps and top, and perhaps meminfo and the /proc file system)
    • File system management (using fdisk and mkfs)
    • Basic troubleshooting (including managing log files and perhaps the use of hardware probing tools, such as ethtool and lspci)


Target Audience:

Experienced Linux system administrators who have responsibilities that include troubleshooting their enterprise Linux environment.


Course Objectives:

  • Introduction to troubleshooting techniques
  • Testing and analyzing hardware
  • Diagnosing performance issues, application, and OS interactions
  • Troubleshooting disks and file systems
  • Testing and diagnosing network configurations
  • Working with security tools like SELinux, authentication, and firewall
  • Making the most of Red Hat support resources


Course Outine:

Being Proactive, Part 1
  • Proactively monitor log files, hardware, file systems, and system and network performance
Being Proactive, Part 2
  • Several approaches to managing configuration changes and developing a recovery plan
Basic Troubleshooting Techniques and Procedures
  • An introduction to troubleshooting methods, best practices, and tools
Booting Issues
  • Use recovery runlevels and rescue mode; work with advanced GRUB features
Hardware Issues
  • Preempting hardware failures (looking for the signs); protecting against hardware failures; redundant configurations; tools to help identify hardware failures and intermittent problems
File System Issues
  • Locate unauthorized changes; audit software; file system tuning and repair; file recovery
Disk Issues
  • Rescuing LVM volumes; maintenance of LUKS-encrypted volumes
Networking Issues
  • Manual configuration of network cards; connectivity issues; network diagnostic tools; monitor packets; tune kernel parameters; troubleshoot SAN communication
Application Issues
  • An overview of tools and techniques for troubleshooting applications; some common application problems and how to solve them
Security Issues
  • Working effectively with (and not against) security tools, including SELinux, authentication, and firewall
Red Hat Resources
  • Support options; Knowledgebase; certified training; initiating support calls; TAM support; developer support; Bugzilla; support workflow; diagnostic and information-gathering tools



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