Linux Diagnostics And Troubleshooting

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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