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Red Hat Linux Troubleshooting

Course Details

Troubleshooting is both an art and a science. It is both an instinct and a technique. In this lab-intensive course, system administrators will learn techniques for troubleshooting a Linux system and how to use the troubleshooting tools available on Red Hat Enterprise Linux. Through hands-on labs, you will learn or improve your troubleshooting skills and gain additional experience by debugging live, virtualized systems.

Course Prerequisites

  • Red Hat System Administration I and Red Hat System Administration II
  • RHCSA Rapid Track Course
  • RHCSA certification or equivalent experience
  • 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 /procfile system)
    • File system management (using fdisk and mkfs)
    • Basic troubleshooting (including managing log files and perhaps using hardwareprobing tools, such as ethtool and lspci)

       

Course Agenda

1. Being Proactive, Part 1

  • Monitor log files, hardware, and file systems
  • Monitor system and network performance

2. Being Proactive, Part 2

  • Approaches to managing configuration changes and developing a recoveryplan

3. Basic Troubleshooting Techniques and Procedures

  • Recovery runlevels and rescue mode
  • Work with advanced GRUB features

4. Hardware Issues

  • Preempting hardware failures (looking for the signs)
  • Protecting against hardware failures
  • Redundant configurations
  • Tools to help identify hardware failures and intermittent problems

5. File System Issues

  • Locate unauthorized changes
  • Audit software
  • File system tuning and repair
  • File recovery

6. Disk Issues

  • Rescuing LVM volumes
  • Maintenance of LUKS-encrypted volumes

7. Networking Issues

  • Manual configuration of network cards
  • Connectivity issues
  • Network diagnostic tools
  • Monitor packets
  • Tune kernel parameters
  • Troubleshoot SAN communication

8. Application Issues

  • Tools and techniques for troubleshooting applications
  • Common application problems and how to solve them

9. Security Issues

  • Working effectively with (and not against) security tools
    • SELinux
    • Authentication
    • Firewall

10. Red Hat Resources

  • Support options
  • Knowledgebase
  • Certified training
  • Initiating support calls
  • TAM support
  • Developer support
  • Bugzilla
  • Support workflow
  • Diagnostic and information-gathering tools