Red Hat Enterprise Linux Diagnostics and Troubleshooting (RH342)

Duration

4 Days

What You’ll Learn

  • 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 such as SELinux, authentication, and firewall
  • Making the most of Red Hat support resources

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 /proc file system)
    • File system management (using fdisk and mkfs)
    • Basic troubleshooting (including managing log files and perhaps using hardware probing tools, such as ethtool and lspci)

Who Needs to Attend

Linux system administrators who understand installation and configuration of a Red Hat Enterprise Linux system and wish to deepen their understanding of troubleshooting on Linux

Course Outline

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 recovery plan

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
  • Technical account manager support
  • Developer support
  • Bugzilla
  • Support workflow
  • Diagnostic and information-gathering tools