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| GL-314
- Linux Troubleshooting |
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| This course is designed to give the Linux system
administrator an in-depth look at common and not
so common Linux system problems. Linux system problems
explored in this course are frequently encountered
with the administration of Linux Systems. This course
takes the approach to troubleshooting with a "break-fix"
philosophy, 25% lecture, and 75% lab intensive content.
Lab exercises contain a pool of over 120 simple
and complex real-world troubleshooting scenarios.
Lab work is flexible enough to satisfy the expectations
of experienced to intermediate administrators through
ranked difficulty of scenarios. Students will find
the approach of this course of structure with flexibility
very rewarding. Lab tasks let students choose the
type of scenarios they would like to tackle, with
hints, helps, and solutions to make learning very
effective. |
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| Prerequisites |
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| Equivalent knowledge of the GL120, GL250, and
GL275 courses |
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| Related Courses |
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| Before: |
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- GL-120: Linux Fundamentals
- GL-250:
Enterprise Linux Systems
Administration
- GL-275: Enterprise Linux Network Services
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| After: |
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- GL-510: Linux Network Security
- GL-550: Enterprise Linux Security Administration
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| Course Content |
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| Section One: Troubleshooting Methodology |
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Module 1 – Tools
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- Common Troubleshooting Tools
- RPM Queries and Verification
- src Packages and spec Files
- strace, ltrace, lsof and fuser
- ipcs and ipcrm
- vmstat, iostat, mpstat, and sar
- ifconfig, ip, arp and route
- Name Resolution
- netstat and rpcinfo
- nmap and nc
- tcpdump and ethereal
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Module 1 Lab:
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- Exploring and documenting current system configuration
state
- Troubleshooting techniques with RPM, process
related tools, and, network related tools
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Module 2 - Rescue Environments
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- Rescue Procedures
- Recovery Examples
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Module 2 Lab:
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- Using rescue disk
- Using mount and chroot to access hard disk
- Reinstalling the MBR with grub-install
- Setting up networking statically
- Mounting an NFS share
- Installing an RPM using the root option
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Module 3
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- Linux Boot Process
- Booting Linux
- Boot Process Troubleshooting
- Process Management and Troubleshooting
- File Systems Concepts and Troubleshooting
- Backups Concepts and Troubleshooting
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Module 3 Lab:
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- Troubleshooting common system and daemon errors
- Restoring files from backup
- Booting Scenarios: 6 exercises
- Process Scenarios: 3 exercises
- Backup Scenarios: 1 exercise
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Module 4
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- Networking Commands Review and Troubleshooting
- IP Aliases vs Virtual Interfaces
- xinetd Concepts and Troubleshooting
- TCP Wrappers Concepts and Troubleshooting
- iptables Concepts and Troubleshooting
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Module 4 Lab:
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- iptables Scenario: 2 exercises
- Networking Scenarios: 4 exercises
- TCP Wrappers Scenarios: 2 exercises
- xinetd Scenarios: 4 exercises
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Module 5
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- X11 Concepts, Troubleshooting, and Server
Operation
- X11 Concepts and Troubleshooting
- Syslog Concepts and Troubleshooting
- RPM Concepts and Troubleshooting
- CUPS Troubleshooting
- at & cron Troubleshooting
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Module 5 Lab:
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- iptables Scenario: 2 exercises
- at & cron Scenarios: 4 exercises
- CUPS Scenerio: 2 exercises
- RPM Scenarios: 4 exercises
- at/cron Scenarios: 4 exercises
- Syslog Scenarios: 3 exercises
- X Scenarios: 7 exercises
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Module 6
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- Users and Groups Troubleshooting
- PAM Concepts and Troubleshooting
- Filesystem Quotas and Quotas Troubleshooting
- FACL's and ACL's for users and/or groups
- File Access Control Lists and Troubleshooting
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Module 6 Lab:
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- Filesystem Scenarios: 6 exercises
- PAM Scenarios: 4 exercises
- Quota Scenarios: 5 exercises
- User and Group Scenarios: 5 exercises
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Module 7
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- DNS Concepts and Troubleshooting
- Apache Concepts and Troubleshooting
- FTP Concepts and Troubleshooting
- Squid Concepts and Troubleshooting
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Module 7 Lab:
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- Apache Scenarios: 5 exercises
- DNS Scenarios: 4 exercises
- FTP Scenarios: 2 exercises
- Squid Scenarios: 4 exercises
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Module 8
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- Samba Concepts and Troubleshooting
- Sendmail Concepts and Troubleshooting
- Postfix Concepts and Troubleshooting
- IMAP & POP Concepts and Troubleshooting
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Module 8 Lab:
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- IMAP/POP Scenarios: 3 exercises
- Postfix Scenarios: 5 exercises
- Samba Scenarios: 3 exercises
- Sendmail Scenarios: 4 exercises
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Module 9
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- Kernel Modules and Troubleshooting
- Logical Volume Management and Creating Logical
Volumes
- LVM Deployment Issues and Troubleshooting
- RAID Concepts and Troubleshooting
- Lightweight Directory Access Protocol and
LDAP Troubleshooting
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Module 9 Lab:
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- Kernel Module Scenarios: 3 exercises
- LDAP Scenarios: 3 exercises
- LVM Scenario: 1 exercise
- NIS scenarios: 2 exercises
- RAID Scenario: 3 exercise
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