
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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