Linux Diagnostics And Troubleshooting




Linux Diagnostics And Troubleshooting

Course Description


Linux Diagnostics And Troubleshooting


Introduction

  • What is troubleshooting?

  • Troubleshooting a login issue

  • Collecting Information

  • System Journal

  • Troubleshoot a web server issue using the log files

  • Using Red Hat Resources

  • Collecting Information with SOSREPORT

  • Practice Lab Session

  • Troubleshoot a FTP Connectivity Issue


Monitoring Systems

  • System Monitoring with Cockpit

  • Performance Co-Pilot or pcp

  • Centralized log server using rsyslog

  • Practice Lab Session

  • Intrusion detection software to monitor changes

  • Advanced Intrusion Detection Environment (AIDE)

  • Practice Lab Session

  • System Auditing with auditd


Identifying Hardware Issues

  • Identify various harwdare and their problems

  • Hardware Error Reporting using mcelog and rasdaemon

  • Memory Testing using memtest86+ package

  • Manging Kernel Modules

  • Loading and unloading modules

  • Managing module options

  • Troubleshooting to disable MSI-X interrupt handling in the driver


Troubleshooting Storage Issues

  • Overview of Linux Storage Stack

  • Virtual File System

  • Filesystems & Device Manager

  • Device Mapper Multipath

  • Recovering from File System Corruption

  • Checking & Repairing ext3/ext4 fs using e2fsck

  • Checking & Repairing xfs fs using xfs_repair

  • Recovering LVM Issues

  • Practice Lab Session - using vgcfgrestore

  • Migrating a Volume Group from one system to another

  • Recovering Metadata in LVM

  • Practice Lab Session

  • Configuration of Iscsi target & Initiator

  • Practice Lab Session on  iscsi target & initiator - 1

  • Practice Lab Session on  iscsi target & initiator - 2


Troubleshooting RPM Issues

  • Resolve package management dependency issues

  • Identify & fix dependency issue

  • Recover a corrupted RPM Database

  • Working with transaction history using Yum command

  • Reverting & repeating transaction using yum command

  • Practice Lab Session


Troubleshooting a Network Issues

  • Check Network Connectivity

  • Scanning Network Ports using nmap

  • Communicating with a remote service using nc command

  • Monitoring Network traffic using iptraf-ng

  • Troubleshooting a network issue (One network interface is not working properly)

  • Troubleshooting tips related with device names of ethernet interface

  • Disable consistent network device naming

  • Overview NetworkManager

  • Practice Lab Session

  • Capturing Packets with tcpdump

  • Practice Lab Sessions


Troubleshooting a Boot Issues

  • Linux Boot process

  • Booting of RHEL 7 with systemd

  • Overview of Grub2

  • Grub2 features

  • Booting into Grub Menu

  • Protect Grub by appying a password

  • Lab on Basic System Recovery (Initramfs file missing/Corrupted)

  • Lab on Basic System Recovery (Grub related issues like grub is missing)

  • Lab on Basic System Recovery (Master Boot Record missing/corrupted)

  • Rescue Modue in RHEL 7

  • Practice Lab Session

  • Reset the root passwd using installation disk

  • Reset the root passwd using rd.break

  • Repairing File System Issues at boot

  • Fix issues at /etc/fstab at boot - Lab Session


Troubleshooting a Security Issues

  • Troubleshooting a SELinux Issue

  • Changing SELinux context

  • troubleshooting ftp connectivity issue using booleans

  • SELinux Audit Logs & Troubleshooting

  • Overview of PAM Security

  • Concepts of PAM

  • PAM Modules & Configurations

  • PAM Module Groups

  • Control Flags in PAM

  • PAM Modules

  • last lecture


This course is aimed at senior system administrators who wish to learn more about troubleshooting

Url: View Details

What you will learn
  • Linux Diagnostics And Troubleshooting
  • To fix common issues on a Red Hat Enterprise Linux machine, using tools provided by the distribution.
  • What is troubleshooting?

Rating: 4.28333

Level: Intermediate Level

Duration: 10.5 hours

Instructor: Shikhar Verma • 60k+ Students Worldwide


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