Linux System Troubleshooting (GL314) – Technical Training Course

The training program 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 techniques. Tools and topics are gradually introduced over the training program of the week, which learners apply in self-paced labs. Learners can choose from over 120 scenarios organized by topic and difficulty. Because each scenario is independent of the others, learners can choose scenarios according to their interests and experience. Each scenario is designed to help learners develop deeper understanding while exploring the problem. All scenarios include optional hints designed to reflect a realistic troubleshooting process, while only gradually revealing the solution. Learners find the flexibility and challenge of this training program very rewarding.
Prerequisites
This training program is designed for intermediate to advanced users. Learners should have already taken the U8583S "Linux Fundamentals", H7091S "Enterprise Linux Systems Administration", and H7092S "Enterprise Linux Networking Services",or have equivalent knowledge. A short ref.

This program is architected to give Linux administrators experience with both common and uncommon system problems.

this training program is designed for intermediate to advanced users. learners should have already taken the U8583S "Linux Fundamentals", H7091S "Enterprise Linux Systems Administration", and H7092S "Enterprise Linux Networking Services",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 7
• SUSE Linux Enterprise 12

1.TROUBLESHOOTING METHODOLOGY

 The Troubleshooting Mindset

 Evaluating Possible Solutions

 Identifying and Implementing Change

 Define and Follow Policies

 Working with Others

 Finding Documentation

 Finding Help Online

2.TROUBLESHOOTING TOOLS

 Common Troubleshooting Tools

 RPM Queries

 RPM Verification

 SRPM and spec Files

 Hardware Discovery Tools

 Configuring New Hardware with hwinfo

 strace and ltrace

 lsof and fuser

 ipcs and ipcrm

 iostat, mpstat, and vmstat

 Using hdparm to Measure

 Troubleshooting with the ip command

 Name Resolution

 ss/netstat and rpcinfo

 nmap

 Netcat

 tcpdump and wireshark

 Lab tasks

 Determining the System's Configuration

 Troubleshooting with rpm

 Process Related Tools

 Network Tools

3.RESCUE ENVIRONMENTS

 Diagnostic/Recovery Runlevels

 Rescue Procedures

 Recovery: mount & chroot

 Recovery Examples

 Recovery: Network Utilities

 Lab tasks

 Recovery Runlevels

 Recovering Damaged MBR

 Recover from Deleted Critical Files

4.TOPIC GROUP 1

 Linux Boot Process

 System Boot Method Overview

 systemd System and Service Manager

 Using systemd

 Booting Linux on PCs

 Troubleshooting With GRUB 2

 Boot Process Troubleshooting

 Troubleshooting: Linux and Init

 Process Management

 Process Management Tools

 Troubleshooting Processes: top

 Filesystem Concepts

 Filesystem Troubleshooting

 Backup Concepts

 Backup Troubleshooting

 Backup Troubleshooting

 Lab tasks

 Troubleshooting Problems: Topic Group 1

5.TOPIC GROUP 2

 Networking Tools

 Linux Network Interfaces

 Networking Commands Review

 NetworkManager

 Networking Troubleshooting

 Networking Troubleshooting

 Virtual Interfaces/IP Aliases

 Network Teaming

 Xinetd Concepts

 Xinetd Troubleshooting

 TCP Wrappers Concepts

 TCP Wrappers Concepts

 TCP Wrappers Troubleshooting

 Netfilter/iptables Concepts

 Netfilter/iptables Troubleshooting

 Lab task 1 Troubleshooting Problems: Topic Group 2

6.TOPIC GROUP 3

 X11 Concepts

 X11 Server Operation

 X11 Troubleshooting

 Rsyslog Concepts

 System Logging

 systemd Journal

 systemd Journal's journactl

 Secure Logging with Journal's Log Sealing

 Syslog Troubleshooting

 RPM Concepts

 RPM Troubleshooting

 Common Unix Printing System (CUPS)

 CUPS Troubleshooting

 CUPS Troubleshooting

 at & cron

 at & cron Usage

 at & cron Troubleshooting

 Lab tasks 1 Troubleshooting Problems: Topic Group 3

7.TOPIC GROUP 4

 Users and Groups

 Users and Groups Troubleshooting

 PAM Concepts

 PAM Troubleshooting

 Filesystem Quotas

 Quotas Troubleshooting

 File Access Control Lists

 FACL Troubleshooting

 SELinux Concepts

 SELinux Troubleshooting

 SELinux Troubleshooting Continued

 LAB TASKS 1 Troubleshooting Problems: Topic Group 4

8.TOPIC GROUP 5

 Kernel Modules

 Kernel Modules Troubleshooting

 Logical Volume Management

 Creating Logical Volumes

 LVM Deployment Issues

 VG Migration, PV Resizing & Troubeshooting

 Software RAID Overview

 RAID Troubleshooting

 Multipathing Overview

 SAN Multipathing

 Multipath Configuration

 Multipathing industry best practices

 LDAP and OpenLDAP

 Troubleshooting OpenLDAP

 NIS and NIS+ (YP)

 NIS Troubleshooting Aids

 LAB TASKS 1 Troubleshooting Problems: Topic Group 5

9.TOPIC GROUP 6

 DNS Concepts

 DNS Troubleshooting

 DNS Troubleshooting

 Apache Concepts

 Apache Troubleshooting

 Apache Troubleshooting

 FTP Concepts

 FTP Troubleshooting

 Squid Concepts

 Squid Troubleshooting

 LAB TASKS 1 Troubleshooting Problems: Topic Group 6

10.TOPIC GROUP 7

 Samba Concepts

 Samba Troubleshooting

 Postfix Concepts

 Postfix Troubleshooting

 Postfix Troubleshooting

 Sendmail Concepts

 Sendmail Troubleshooting

 IMAP & POP Concepts

 IMAP/POP Troubleshooting

 LAB TASKS 1 Troubleshooting Problems: Topic Group 7