Linux Diagnostics And Troubleshooting
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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

Who this course is for:

  • Linux Diagnostics and Troubleshooting course is aimed at senior system administrators who wish to learn more about troubleshooting.

What you’ll 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?
  • Troubleshooting a login issue
  • Troubleshoot a web server issue using the log files
  • Troubleshoot a FTP Connectivity Issue
  • System Monitoring with Cockpit
  • Centralized log server using rsyslog
  • Advanced Intrusion Detection Environment (AIDE)
  • System Auditing with auditd
  • Identify various harwdare and their problems
  • Hardware Error Reporting using mcelog and rasdaemon
  • Manging Kernel Modules
  • Troubleshooting to disable MSI-X interrupt handling in the driver
  • Troubleshooting Storage Issues
  • Overview about Filesystems, Device Manager & Device Mapper Multipath
  • Recovering from File System Corruption
  • Migrating a Volume Group from one system to another
  • Configuration of Iscsi target & Initiator
  • Troubleshooting RPM Issues
  • Recover a corrupted RPM Database
  • Working with transaction history using Yum command
  • Troubleshooting a Network Issues
  • Scanning Network Ports using nmap
  • nc & iptraf-ng commands
  • Troubleshooting a network issue (One network interface is not working properly)
  • Troubleshooting a Boot Issues
  • Lab on Basic System Recovery
  • Reset the root passwd using installation disk or rd break
  • Troubleshooting a Security Issues
  • Troubleshooting a SELinux Issue
  • SELinux Audit Logs & Troubleshooting
  • Overview of PAM Security & Concepts of PAM
  • Various practice lab session

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