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RedHat Enterprise Linux Diagnostics And Troubleshooting (RH342)

Introduction
  • Red Hat Enterprise Linux Diagnostics and Troubleshooting (RH342) Diagnose problems, gather information, and fix common issues in RedHat Enterprise Linux Operating Systems.
Objectives
  • To diagnose problems in various subsystems on RHEL7 systems, using tools provided with the distribution.
  • To gather information to assist Red Hat Support in diagnosing, and fixing, issues that can occur on a Red Hat Enterprise Linux system./li>
  • To fix common issues on a Red Hat Enterprise Linux machine, using tools provided by the distribution.
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Course Overview
  • System Administrators will learn how to apply the scientific method to a structured form of troubleshooting. This approach is then used troubleshooting various types of issues, including boot issues, hardware issues, storage issues, RPM issues, network issues, third-party application issues, security issues, and kernel issues. At the end of the course students can complete various comprehensive review labs to test their skills.
Audience
  • Red Hat Enterprise Linux Diagnostics and Troubleshooting was very helpful for linux system administrators to troublshoot various types of issues in linux systems,like boot issues,hardware issues,security issues,kernel issues,storage issues, package dependency issue,application library issues and users security related issues.
  • Like a preconfigured environment, has issues like real time we will apply the various procedures to fix.
  • Red Hat Certified Engineer (RHCE) interested in becoming a Red Hat Certified Specialist or Red Hat Certified Architect (RHCA)
Prerequisites
  • RedHat Certified System Administrator Certification or equivalent knowledge in 7
  • RedHat Certified Engineer Certification or equivalent knowledge in 7
  • System Administrators to know including,
    • Installing Linux Operating System and entry level commands called (touch,cat,cd,pwd,ls,history,vim,cp,mv)
    • Installing and removing Applications using (yum and rpm)
    • Service and Daemons Handling using systemctl, chkconfig and service commands
    • Basic system monitoring application like ps,top,free,htop,vmstat
    • Basic File system management using fdisk and gdisk
    • Advanced Partion management called LogicalVoulmeManager
    • Basic troubleshooting about linux operating system.

Topics In RedHat Enterprise Linux Diagnostics And Troubleshooting



1 . What Is Troubleshooting

  • Troubleshooting various issues using scientific method
  • Collecting logs using Journalctl
  • Getting help from redhat technical team using redhat-support-tool and sosreport
2 . Being Proactive

  • Monitering Linux system using cockpit and nagios
  • To collect linux os subsystem level informations using PCP, vmstat, sar, pmstat
  • Monitering filesystem changes using Audit and Aide applicatio
  • How Puppet was working?
  • Collecting logs using rsyslog, store logs in remote systems, logrorate


3 . Troubleshooting Boot Issues

  • Boot Sequence of RHEL 7 Operating System
  • Troubleshooting Grub error and Grub rescue error
  • Recovering Administrator password
  • Difference between UFI and EFI
  • Adjusting systemd unit file variables
4 . Identifying Hardware Issues

  • Display the available hardwares in linux system using various commands like lshw, lspci
  • Changing the default feature of linux kernenl modules
  • troubleshooting virutual machines related issues while installing and removing
5 . Troubleshooting Storage Issues

  • Describe the functions of the layers of the Linux storage stack
  • Recover corrupted file systems using e2fsck, fsck and xfs_repair.
  • Recover from broken LVM configurations.
  • Recover data from encrypted file systems.
  • Identify and fix ISCSI issues.
  • Troubleshooting CHAP Authetication releated issues in Iscsi
6 . Troubleshooting RPM Issues

  • To deny the package update using yum version lock
  • Resolve package management dependency issues manually.
  • Recover a corrupted Red Hat Package Management (RPM) database.
  • Identify and restore changed files using the package management subsystem.
  • Get updates from Red Hat subscription management
7 . Troubleshooting Network Issue

  • Verify network connectivity using standard tools called ping
  • Capturing network packetes
  • Identifying network traffic using different kinds of commands
  • Troubleshooting dns connectivity related issues
  • Troubleshooting interface name related issues
8 . Troubleshooting Application Issues

  • Identify library dependencies for third-party software
  • Identify if an application suffers from memory leaks
  • Debug an application using standard tools
  • How to trace application execution in linux using tracing commands
9 . Dealing With Security Issues

  • Identifiying and troubleshooting SELinux relates issues
  • Troubleshooting PAM authentication related issues
  • Troubleshooting Identity management related issues
  • Troubleshooting kerberos authentication related issues
10 . Troubleshooting Kernel Issues

  • Configuring Kdump
  • IValidating corrupted kernel image files
  • Compile and execute SystemTap modules in redhat enterprise linux
  • To collect kernel subsystem level information using systemtap modules
11 . Redhatlinux diagnostics and troubleshooting comprehensive review

  • Review and refresh knowledge and skills learned in RedHat Enterprise Linux Diagnostics and Troubleshooting
  • Practice and demonstrate knowledge and skills learned in Red Hat Enterprise Linux Diagnostics and Troubleshooting



Outcome

Linux system administrator they have confient to clear a various issues in linux operating system, they no need get help from google or some other forms.

Troubleshooters No need to refer the any documentations after this course learning



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