Red Hat Enterprise Linux Diagnostics and Troubleshooting (RH342)

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Who Should 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

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

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

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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)

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