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 GL124, GL134 and GL254, 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 8

SUSE Linux Enterprise 12

Recommended Class Length:

5 days

Detailed Course Outline:

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
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, vmstat, and pidstat
11. Using hdparm to Measure
12. Troubleshooting with the ip command
13. Name Resolution
14. ss/netstat and rpcinfo
15. nmap
16. Netcat
17. tcpdump and wireshark
LAB TASKS
1. Determining the System's Configuration
2. Troubleshooting with rpm
3. Process Related Tools
4. Network Tools
RESCUE ENVIRONMENTS
1. Diagnostic/Recovery
2. Rescue Procedures
3. Recovery: mount & chroot
4. Recovery Examples
5. Recovery: Network Utilities
LAB TASKS
1. Recovery Runlevels
2. Recovering Damaged MBR
3. Recover from Deleted Critical Files
TOPIC GROUP 1
1. Linux Boot Process
2. System Boot Method Overview
3. systemd System and Service Manager
4. Modifying systemd services
5. Using systemd
6. Booting Linux on PCs
7. Troubleshooting With GRUB 2
8. The Boot Loader Specification
9. Boot Process Troubleshooting
10. Troubleshooting: Linux and Init
11. Process Management
12. Process Management Tools
13. Troubleshooting Processes: top
14. Filesystem Concepts
15. Filesystem Troubleshooting
16. Backup Concepts
17. Backup Troubleshooting
18. Backup Troubleshooting
LAB TASKS
1. Troubleshooting Problems: Topic Group 1
TOPIC GROUP 2
1. Networking Tools
2. Linux Network Interfaces
3. Networking Commands Review
4. NetworkManager
5. Networking Troubleshooting
6. Networking Troubleshooting
7. Virtual Interfaces/IP Aliases
8. Network Teaming
9. Xinetd Concepts
10. Xinetd Troubleshooting
11. TCP Wrappers Concepts
12. TCP Wrappers Concepts
13. TCP Wrappers Troubleshooting
14. Netfilter/iptables Concepts
15. Netfilter/iptables Troubleshooting
LAB TASKS
1. Troubleshooting Problems: Topic Group 2
TOPIC GROUP 3
1. X11 Concepts
2. X11 Server Operation
3. X11 Troubleshooting
4. System Logging
5. Rsyslog Concepts
6. systemd Journal
7. systemd Journal's journalctl
8. Secure Logging with Journal's Log Sealing
9. Syslog Troubleshooting
10. RPM Concepts
11. RPM Troubleshooting
12. Common Unix Printing System (CUPS)
13. CUPS Troubleshooting
14. CUPS Troubleshooting
15. at & cron
16. at & cron Usage
17. at & cron Troubleshooting
18. Systemd Timers
19. Systemd Timer Troubleshooting
LAB TASKS
1. Troubleshooting Problems: Topic Group 3
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
1. Troubleshooting Problems: Topic Group 4
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 & Troubleshooting
7. Software RAID Overview
8. RAID Troubleshooting
9. Multipathing Overview
10. SAN Multipathing
11. Multipath Configuration
12. Multipathing Best Practices
13. LDAP and OpenLDAP
14. Troubleshooting OpenLDAP
15. LDAP and 389 Directory Server
16. Troubleshooting 389 Directory Server
17. NIS and NIS+ (YP)
18. NIS Troubleshooting Aids
LAB TASKS
1. Troubleshooting Problems: Topic Group 5
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
1. Troubleshooting Problems: Topic Group 6
TOPIC GROUP 7
1. Samba Concepts
2. Samba Troubleshooting
3. Postfix Concepts
4. Postfix Troubleshooting
5. Postfix Troubleshooting
6. IMAP & POP Concepts
7. IMAP/POP Troubleshooting
8. MariaDB
9. MariaDB Troubleshooting
LAB TASKS
1. Troubleshooting Problems: Topic Group 7

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GL314 - Linux Troubleshooting