Red Hat Enterprise Linux Systems Administration
Troubleshooting Techniques and Tools

Linux Training Overview

This course will teach the commands and methods needed to perform troubleshooting networking, security, and performance issues on a functioning RHEL 6 system. The course will also use a problem solving approach in the lab exercises to teach system administrators a methodology of: discovery, analysis, tools, and solution in each area that is covered.

This course is the equivalent to Red Hat course 142.

Systems: Red Hat Enterprise Linux Version 6 (all update levels)

Linux Training Prerequisites

It is assumed that the participant has successfully completed the Red Hat System Administration I (RH 124) and Red Hat System Administration II (RH 134) courses, or has equivalent system time as a user and a working systems administrator.

Linux Training Course duration

This course normally requires three (3) days, approximately 60% lecture, and 40% lab time.

Linux Training Course Objectives

On completion of this course, a systems administrator should be able to use a methodology to analyze and solve problems with system components, along with usage of tools to proactively identify issues as they occur (or before they occur).

Linux Training Course outline

Review of System Concepts for System Administrators

  • System administrator functions
  • Using the root account
  • root access via sudo
  • Using the RHEL 6 administrative graphical interfaces
  • Manipulating root account history files
  • Installing and using webmin for remote administration
Overview of Troubleshooting Techniques
  • methodologies
  • available tools
    • in RHEL 6 distributions
    • third party
    • freeware
    • system-specific ( "home-grown" )
Startup Time Issues and Resolutions
  • review of boot time components
  • troubleshooting GRUB problems
  • building GRUB recovery boot media
  • alternate methods of booting
    • single user mode
    • recovery or installation media
  • fixing problems with filesystem structures
  • resolving issues with LVM boot file systems
RHEL 6 Hardware Configuration
  • location of key files and descriptions
  • tools to manipulate hardware configuration files
  • understanding hardware discovery and drivers
  • diagnostic tools to test hardware components
RHEL 6 Software Configuration
  • location of key files and descriptions
  • tools to manipulate configuration files
Networking Troubleshooting Considerations
  • review of networking hardware / software components
  • techniques to manually configure network interfaces
  • software IP configuration / testing using ifconfig
  • testing areas and tools
    • network connectivity
    • server configuration (files)
    • DNS, VSFTPD, DHCPD, SAMBA available toolss
Security Issues
  • review of security in all major component areas
  • impact of selected security level
    • default from installation
    • SELinux
    • via "hardening" tools
  • PAM
    • security role in RHEL 6
    • functional areas
    • files and configuration
    • resolving issues with PAM controls
    • security monitoring / troubleshooting tools
Application Troubleshooting
  • writing utilities to sense problems
    • physical memory usage
    • paging file
    • disk and network I/O bandwidth
Resources for Troubleshooting Information
  • on-line searchable repositories
  • available diagnostic tools (summary)
  • Red Hat support options

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