GL314 – Linux Troubleshooting

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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: D00


This course is designed for intermediate to advanced users. Students should have already taken the GL120, GL250and 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

Detailed 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.    Configuring New Hardware with hwinfo

7.    strace and ltrace

8.    lsof and fuser

9.    ipcs and ipcrm

10.iostat, mpstat, and vmstat

11.Using hdparm to Measure

12.Troubleshooting with the ip command

13.Name Resolution

14.netstat and rpcinfo



17.tcpdump and wireshark

Lab Tasks

18.Determining the System’s Configuration

19.Troubleshooting with rpm

20.Process Related Tools

21.Network Tools

3.   Rescue Environments

1.    Diagnostic/Recovery Runlevels

2.    Rescue Procedures

3.    Recovery: mount & chroot

4.    Recovery Examples

5.    Recovery: Network Utilities

Lab Tasks

6.    Recovery Runlevels

7.    Entering the Rescue Mode

8.    Re-install a destroyed Master Boot Record

9.    Recover from Deleted Critical Files

10.Using SUSE Auto Repair Mode

4.   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

Lab Tasks

14.Troubleshooting Problems: Topic Group 1

5.   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

Lab Tasks

13.Troubleshooting Problems: Topic Group 2

6.   Topic Group 3

1.    X11 Concepts

2.    X11 Server Operation

3.    X11 Troubleshooting

4.    Syslog Concepts

5.    syslog-ng Concepts

6.    Syslog Troubleshooting

7.    RPM Concepts

8.    RPM Troubleshooting

9.    Common Unix Printing System (CUPS)

10.CUPS Troubleshooting

11.CUPS Troubleshooting & cron & cron Usage & cron Troubleshooting

Lab Tasks

15.Troubleshooting Problems: Topic Group 3

7.   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

Lab Tasks

12.Troubleshooting Problems: Topic Group 4

8.   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

Lab Tasks

11.Troubleshooting Problems: Topic Group 5

9.   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

Lab Tasks

11.Troubleshooting Problems: Topic Group 6

10.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

Lab Tasks

10.Troubleshooting Problems: Topic Group 7