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.

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 5 Update 4

Recommended Class Length:

5 days

Detailed Course Outline:

  1. Troubleshooting Methodology
    1. The Troubleshooting Mind set
    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
    8. Finding Community Help
  2. Tools
    1. Common Troubleshooting Tools
    2. RPM Queries
    3. RPM Verification
    4. SRPM and spec Files
    5. strace and ltrace
    6. lsof and fuser
    7. ipcs and ipcrm
    8. iostat, mpstat, and vmstat
    9. ifconfig and ip
    10. arp and route
    11. Name Resolution
    12. netstat and rpcinfo
    13. nmap
    14. Netcat
    15. tcpdump and ethereal
    Lab Tasks
    1. Determining the System's Configuration
    2. Troubleshooting with rpm
    3. Process Related Tools
    4. Network Tools
  3. Rescue Environments
    1. Runlevels
    2. Rescue Procedures
    3. Recovery Examples
    Lab Tasks
    1. Recovery Runlevels
    2. Entering the Rescue Mode
    3. Re-install a destroyed Master Boot Record
    4. Recover from Deleted Critical Files
    5. Using SUSE Auto Repair Mode
  4. Topic Group 1
    1. Linux Boot Process
    2. Booting Linux
    3. Boot Process Troubleshooting
    4. Process Management and Troubleshooting
    5. File Systems Concepts and Troubleshoot­ing
    6. Backups Concepts and Troubleshooting
    Lab Tasks
    1. Troubleshooting Problems: Topic Group 1
  5. Topic Group 2
    1. Networking Tools
    2. Networking Commands Review
    3. Networking Troubleshooting
    4. IP Aliases vs Virtual Interfaces
    5. xinetd Concepts and Troubleshooting
    6. TCP Wrappers Concepts and Troubleshoot­ing
    7. Netfilter/iptables Concepts and Trouble­shooting
    Lab Tasks
    1. Troubleshooting Problems: Topic Group 2
  6. Topic Group 3
    1. X11 Concepts, Troubleshooting, and Server Operation
    2. Syslog Concepts and Troubleshooting
    3. syslog-ng Concepts
    4. RPM Concepts and Troubleshooting
    5. Common Unix Printing System (CUPS)
    6. CUPS Troubleshooting
    7. at & cron Usage and Troubleshooting
    Lab Tasks
    1. Troubleshooting Problems: Topic Group 3
  7. Topic Group 4
    1. Users and Groups
    2. Users and Groups Troubleshooting
    3. PAM Concepts and Troubleshooting
    4. Filesystem Quotas and Quotas Trouble­shooting
    5. File Access Control Lists
    6. FACL Troubleshooting
    7. SELinux Concepts
    8. SELinux Troubleshooting
    Lab Tasks
    1. Troubleshooting Problems: Topic Group 4
  8. Topic Group 5
    1. Kernel Modules and Troubleshooting
    2. Logical Volume Management
    3. Creating Logical Volumes
    4. LVM Deployment Issues
    5. LVM Troubleshooting
    6. RAID Concepts and Troubleshooting
    7. Lightweight Directory Access Protocol
    8. LDAP Troubleshooting
    Lab Tasks
    1. Troubleshooting Problems: Topic Group 5
  9. Topic Group 6
    1. DNS Concepts and Troubleshooting
    2. Apache Concepts and Troubleshooting
    3. FTP Concepts and Troubleshooting
    4. Squid Concepts and Troubleshooting
    Lab Tasks
    1. Troubleshooting Problems: Topic Group 6
  10. Topic Group 7
    1. Samba Concepts and Troubleshooting
    2. Sendmail Concepts and Troubleshooting
    3. Postfix Concepts and Troubleshooting
    4. IMAP & POP Concepts and Troubleshooting
    Lab Tasks
    1. Troubleshooting Problems: Topic Group 7
 
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