Linux Diagnostics And Troubleshooting
- 4.4
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Brief Introduction
This course is aimed at senior system administrators who wish to learn more about troubleshootingDescription
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
Requirements
- Requirements
- PC or Laptop with internet Connection
- A RHCSA/RHCE certification, or equivalent knowledge is required to successfully sit this course.
Knowledge
- 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
Shikhar Verma • 30,000+ Students Worldwide
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