Duration
4 days
Course Description
Techniques for troubleshooting a Linux system
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 6.
This course relates to Red Hat Enterprise Linux 6. It is a heavily lab-oriented class designed to help the student learn or improve troubleshooting skills. Students will gain troubleshooting experience by debugging live, virtualized systems.
Course content summary
- Introduction to troubleshooting techniques
- Testing and analyzing hardware
- Diagnosing performance issues, application, and OS interactions
- Troubleshooting disks and file systems
- Testing and diagnosing network configurations
- Working with security tools like SELinux, authentication, and firewall
- Making the most of Red Hat support resources
Audience:
Experienced Linux system administrators who have responsibilities that include troubleshooting their enterprise Linux environment.
Prerequisites:
- Red Hat System Administration I and II or Red Hat Certified System Administrator (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)
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
An introduction to troubleshooting methods, best practices, and tools
Booting Issues
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
Recommended next exam or course
Red Hat System Administration III (RH254)
Red Hat System Administration III with RHCSA and RHCSE exams (RH255)
This is a version-specific reference outline. Confirm the current syllabus and delivery arrangements with EIEIO.