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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. 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.
- 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:
- 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)
Target Audience:Experienced Linux system administrators who have responsibilities that include troubleshooting their enterprise Linux environment.
- 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
Course Outine:Being Proactive, Part 1
- Proactively monitor log files, hardware, file systems, and system and network performance
- Several approaches to managing configuration changes and developing a recovery plan
- An introduction to troubleshooting methods, best practices, and tools
- Use recovery runlevels and rescue mode; work with advanced GRUB features
- Preempting hardware failures (looking for the signs); protecting against hardware failures; redundant configurations; tools to help identify hardware failures and intermittent problems
- Locate unauthorized changes; audit software; file system tuning and repair; file recovery
- Rescuing LVM volumes; maintenance of LUKS-encrypted volumes
- Manual configuration of network cards; connectivity issues; network diagnostic tools; monitor packets; tune kernel parameters; troubleshoot SAN communication
- An overview of tools and techniques for troubleshooting applications; some common application problems and how to solve them
- Working effectively with (and not against) security tools, including SELinux, authentication, and firewall
- Support options; Knowledgebase; certified training; initiating support calls; TAM support; developer support; Bugzilla; support workflow; diagnostic and information-gathering tools