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GL314 - Linux Troubleshooting

The GL314 is designed to give Linux administrators experience with both common and uncommon system problems. The course is based on the idea that the best way to learn troubleshooting is to perform troubleshooting. Approximately 25% of class time is spent on lecture, leaving 75% for intensive lab content. Class starts with a discussion of effective troubleshooting technique. Tools and topics are gradually introduced over the course of the week. Students practice applying these tools and techniques in self-paced labs. Students can choose from over 120 scenarios organized by topic and difficulty. Because each scenarios is independent of the others, students can choose scenarios according to their interests and experience. Each scenario is designed to help students develop deeper understanding while exploring the problem. All scenarios includes optional hints designed to reflect a realistic troubleshooting process while only gradually revealing the solution. Students find the flexibility and challenge of this course very rewarding.

Current Version: F00

Prerequisites:

This course is designed for intermediate to advanced users. Students should have already taken the GL120, GL250 and GL275, or have equivalent knowledge. A short refresher for each topic will be presented, but will not be discussed in depth.

Supported Distributions:

Red Hat Enterprise Linux 6

SUSE Linux Enterprise 11

Course Outline:

  1. Troubleshooting Methodology

    1. The Troubleshooting Mindset

    2. Evaluating Possible Solutions

    3. Identifying and Implementing Change

    4. Define and Follow Policies

    5. Working with Others

    6. Finding Documentation

    7. Finding Help Online

  2. Troubleshooting Tools

    1. Common Troubleshooting Tools

    2. RPM Queries

    3. RPM Verification

    4. SRPM and spec Files

    5. Hardware Discovery Tools

    6. strace and ltrace

    7. lsof and fuser

    8. ipcs and ipcrm

    9. iostat, mpstat, and vmstat

    10. Using hdparm to Measure

    11. Troubleshooting with the ip command

    12. Name Resolution

    13. netstat and rpcinfo

    14. nmap

    15. Netcat

    16. tcpdump and wireshark

  3. Lab Tasks

    1. Determining the System's Configuration

    2. Troubleshooting with rpm

    3. Process Related Tools

    4. Network Tools

  4. Rescue Environments

    1. Diagnostic/Recovery Runlevels

    2. Rescue Procedures

    3. Recovery: mount & chroot

    4. Recovery Examples

    5. Recovery: Network Utilities

  5. Lab Tasks

    1. Recovery Runlevels

    2. Recovering Damaged MBR

    3. Recover from Deleted Critical Files

  6. Topic Group 1

    1. Linux Boot Process

    2. Booting Linux on PCs

    3. Troubleshooting With GRUB

    4. Boot Process Troubleshooting

    5. Troubleshooting: Linux and Init

    6. Process Management

    7. Process Management Tools

    8. Troubleshooting Processes: top

    9. Filesystem Concepts

    10. Filesystem Troubleshooting

    11. Backup Concepts

    12. Backup Troubleshooting

    13. Backup Troubleshooting

  7. Lab Tasks

    1. Troubleshooting Problems: Topic Group 1

  8. Topic Group 2

    1. Networking Tools

    2. Networking Commands Review

    3. Networking Troubleshooting

    4. Networking Troubleshooting

    5. Virtual Interfaces/IP Aliases

    6. Xinetd Concepts

    7. Xinetd Troubleshooting

    8. TCP Wrappers Concepts

    9. TCP Wrappers Concepts

    10. TCP Wrappers Troubleshooting

    11. Netfilter/iptables Concepts

    12. Netfilter/iptables Troubleshooting

  9. Lab Tasks

    1. Troubleshooting Problems: Topic Group 2

  10. Topic Group 3

    1. X11 Concepts

    2. X11 Server Operation

    3. X11 Troubleshooting

    4. Syslog Concepts

    5. Syslog Troubleshooting

    6. RPM Concepts

    7. RPM Troubleshooting

    8. Common Unix Printing System (CUPS)

    9. CUPS Troubleshooting

    10. CUPS Troubleshooting

    11. at & cron

    12. at & cron Usage

    13. at & cron Troubleshooting

  11. Lab Tasks

    1. Troubleshooting Problems: Topic Group 3

  12. Topic Group 4

    1. Users and Groups

    2. Users and Groups Troubleshooting

    3. PAM Concepts

    4. PAM Troubleshooting

    5. Filesystem Quotas

    6. Quotas Troubleshooting

    7. File Access Control Lists

    8. FACL Troubleshooting

    9. SELinux Concepts

    10. SELinux Troubleshooting

    11. SELinux Troubleshooting Continued

  13. Lab Tasks

    1. Troubleshooting Problems: Topic Group 4

  14. Topic Group 5

    1. Kernel Modules

    2. Kernel Modules Troubleshooting

    3. Logical Volume Management

    4. Creating Logical Volumes

    5. LVM Deployment Issues

    6. VG Migration, PV Resizing & Troubeshooting

    7. Software RAID Overview

    8. RAID Troubleshooting

    9. LDAP and OpenLDAP

    10. Troubleshooting OpenLDAP

    11. NIS and NIS+ (YP)

    12. NIS Troubleshooting Aids

  15. Lab Tasks

    1. Troubleshooting Problems: Topic Group 5

  16. Topic Group 6

    1. DNS Concepts

    2. DNS Troubleshooting

    3. DNS Troubleshooting

    4. Apache Concepts

    5. Apache Troubleshooting

    6. Apache Troubleshooting

    7. FTP Concepts

    8. FTP Troubleshooting

    9. Squid Concepts

    10. Squid Troubleshooting

  17. Lab Tasks

    1. Troubleshooting Problems: Topic Group 6

  18. Topic Group 7

    1. Samba Concepts

    2. Samba Troubleshooting

    3. Postfix Concepts

    4. Postfix Troubleshooting

    5. Postfix Troubleshooting

    6. Sendmail Concepts

    7. Sendmail Troubleshooting

    8. IMAP & POP Concepts

    9. IMAP/POP Troubleshooting

  19. Lab Tasks

    1. Troubleshooting Problems: Topic Group 7

 

Jose Nuno Neto
 
 
 
 
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