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RH242 - Red Hat Linux Troubleshooting


Duration: 4 days

Red Hat Linux Troubleshooting - is both an art and a science. An instinct and a technique. 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. This course is a 4-day, heavily lab-oriented class designed to help the student learn or improve troubleshooting skills. Students will gain troubleshooting experience by debugging live, virtualized systems.


  • Introduction to troubleshooting techniques, including being prepared
  • Troubleshooting hardware, including listing, testing, and analyzing devices
  • Troubleshooting applications, including diagnosing performance problems and investigating application and OS interactions
  • Troubleshooting disks and file systems, including LVM, LUKS, ext3/4, and unauthorized changes
  • Troubleshooting the network, including configuring, testing, and diagnosing problems with basic and advanced configurations
  • Security, including working effectively with (and not against) security tools like SELinux, authentication, and firewall
  • Making the most of Red Hat support resources


1. Troubleshooting Techniques
  • Troubleshooting methods
  • Best practices
  • Tools
2. Troubleshooting Boot Issues
  • Working with advanced GRUB features
  • Rescue and GRUB CDs
  • Advanced ext2/ext3 filesystem repair
  • Rescuing RAID and LVM volumes
3. Local Configuration
  • Tools to identify configuration problems
4. Hardware
  • Preempting hardware failures (looking for the signs)
  • Protecting against hardware failures
  • Redundant configurations
  • Tools to help identify hardware failures and intermittent problems
5. Applications
  • Tools and techniques for troubleshooting applications
  • Common application problems and how to solve them
6. Network
  • Manual configuration of network cards
  • Troubleshooting advanced setups (bonded interfaces, virtual interfaces)
  • Connectivity issues
  • Network diagnostic tools
7. Security
  • Working effectively with (and not against) security tools, including SELinux, SSL, and authentication
8. Red Hat Resources and Reporting Problems
  • Support options
  • Knowledgebase
  • Certified training
  • Initiating support calls
  • TAM support
  • Developer support
  • Bugzillas
  • Support workflow
  • Diagnostic and information-gathering tools


Linux system administrators who understand how to install and configure a Red Hat Enterprise Linux system and who wish to deepen their understanding of troubleshooting on Linux


  • Red Hat System Administration I and II or 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)


This course is not associated with any Certification.


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