Linux Troubleshooting (GL314)

Module 1: Troubleshooting MethodologyTopic

• The Troubleshooting Mindset

• Evaluating Possible Solutions

• Identifying and Implementing Change

• Define and Follow Policies

• Working with Others

• Finding Documentation

• Finding Help Online

 

Module 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

 

Module 3: Rescue Environments

• Diagnostic/Recovery

• Rescue Procedures

• Recovery: mount & chroot

• Recovery Examples

• Recovery: Network Utilities

Lab Tasks

– Recovery Runlevels

– Recovering Damaged MBR

– Recover from Deleted Critical Files

 

Module 4: Topic Group 1

• Linux Boot Process

• System Boot Method Overview

• systemd System and Service Manager

• Modifying system Services

• Using systemd

• Booting Linux on PCs

• Troubleshooting With GRUB 2

• The Boot Loader Specification

• 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

 

Module 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 Tasks

– Troubleshooting Problems: Topic Group 2

 

Module 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

• at & cron

• at & cron Usage

• at & cron Troubleshooting

• systemd Timers

• system Timer troubleshooting

Lab Tasks

– Troubleshooting Problems: Topic Group 3

 

Module 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

– Troubleshooting Problems: Topic Group 4 

 

Module 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 Best Practices

• LDAP and OpenLDAP

• Troubleshooting OpenLDAP

• LDAP and 389 Directory Server

• Troubleshooting 389 Directory Server

• NIS and NIS+ (YP)

• NIS Troubleshooting Aids

Lab Tasks

– Troubleshooting Problems: Topic Group 5

 

Module 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

– Troubleshooting Problems: Topic Group 6 

 

Module 10: Topic Group 7

• Samba Concepts

• Samba Troubleshooting

• Postfix Concepts

• Postfix Troubleshooting

• Postfix Troubleshooting

• IMAP & POP Concepts

• IMAP/POP Troubleshooting

• MariaDB

• MariaDB Troubleshooting

Lab Tasks

– Troubleshooting Problems: Topic Group 7 Topic

Prerequisites

Before attending this course, you should have:

• Linux Fundamentals (U8583S)

• Enterprise Linux Systems Administration (H7091S)

• Enterprise Linux Networking Services (H7092S), or have equivalent knowledge.

A short refresher for each topic will be presented, but will not be discussed in depth.