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

Eligiblity for Certification :

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