Red Hat Linux Troubleshooting (RH 242)


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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.

Target Audience

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


  • 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)

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

Full Course Outline

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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