RH 242

(Investment of Time: 32 hours)

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 four-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.

Ideal for 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.

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

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.