Linux Diagnostics And 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
GRUB Boot Loader Issues
Kernel Panic
Filesystem Corruption
Requirements
PC or Laptop with internet Connection
A RHCSA/RHCE certification, or equivalent knowledge is required to successfully sit this course.
Description
Senior system administrators who are interested in troubleshooting more are the target audience for this course.Every section of this course has a different set of quizzes, and there is also many project lab assignment that will help you demonstrate what you have learned.Linux Diagnostics And TroubleshootingCourse ContentIntroductionWhat is troubleshooting?Troubleshooting a login issueCollecting InformationSystem JournalTroubleshoot a web server issue using the log filesUsing Red Hat ResourcesCollecting Information with SOSREPORTPractice Lab SessionTroubleshoot a FTP Connectivity IssueQuiz - MCQMonitoring SystemsSystem Monitoring with CockpitPerformance Co-Pilot or pcpCentralized log server using rsyslogPractice Lab SessionIntrusion detection software to monitor changesAdvanced Intrusion Detection Environment (AIDE)Practice Lab SessionSystem Auditing with auditdQuiz - MCQIdentifying Hardware IssuesIdentify various hardware and their problemsHardware Error Reporting using mcelog and rasdaemonMemory Testing using memtest86+ packageManaging Kernel ModulesLoading and unloading modulesManaging module optionsTroubleshooting to disable MSI-X interrupt handling in the driverQuiz - MCQTroubleshooting Storage IssuesOverview of Linux Storage StackVirtual File SystemFilesystems & Device ManagerDevice Mapper MultipathRecovering from File System CorruptionChecking & Repairing ext3/ext4 fs using e2fsckChecking & Repairing xfs fs using xfs_repairRecovering LVM IssuesPractice Lab Session - using vgcfgrestoreMigrating a Volume Group from one system to anotherRecovering Metadata in LVMPractice Lab SessionConfiguration of Iscsi target & InitiatorPractice Lab Session on iscsi target & initiator - 1Practice Lab Session on iscsi target & initiator - 2Quiz - MCQTroubleshooting RPM IssuesResolve package management dependency issuesIdentify & fix dependency issueRecover a corrupted RPM DatabaseWorking with transaction history using Yum commandReverting & repeating transaction using yum commandPractice Lab SessionQuiz - MCQTroubleshooting a Network IssuesCheck Network ConnectivityScanning Network Ports using nmapCommunicating with a remote service using nc commandMonitoring Network traffic using iptraf-ngTroubleshooting a network issue (One network interface is not working properly)Troubleshooting tips related with device names of ethernet interfaceDisable consistent network device namingOverview NetworkManagerPractice Lab SessionCapturing Packets with tcpdumpPractice Lab SessionsQuiz - MCQTroubleshooting a Boot IssuesLinux Boot processBooting of RHEL 7 with systemdOverview of Grub2Grub2 featuresBooting into Grub MenuProtect Grub by appying a passwordLab 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 7Practice Lab SessionReset the root passwd using installation diskReset the root passwd using rd.breakRepairing File System Issues at bootFix issues at /etc/fstab at boot - Lab SessionAssignment - This lab project assignment aims to explore some common Red Hat Linux boot issues and provide solutions to resolve them.Troubleshooting a Security IssuesTroubleshooting a SELinux IssueChanging SELinux contexttroubleshooting ftp connectivity issue using booleansSELinux Audit Logs & TroubleshootingOverview of PAM SecurityConcepts of PAMPAM Modules & ConfigurationsPAM Module GroupsControl Flags in PAMPAM Moduleslast lecture
Linux Diagnostics and Troubleshooting course is aimed at senior system administrators who wish to learn more about troubleshooting.