Module 1: Troubleshooting Methodology

• The Troubleshooting Mindset
• Evaluating Possible Solutions
• Identifying and Implementing Change
• Define and Follow Policies
• Working with Others
• Finding Documentation
• Finding Help Online

Module 2: Troubleshooting Tools

• Common Troubleshooting Tools
• RPM Queries
• RPM Verification
• SRPM and spec Files
• Hardware Discovery Tools
• Configuring New Hardware with hwinfo
• strace and ltrace
• lsof and fuser
• ipcs and ipcrm
• iostat, mpstat, and vmstat
• Using hdparm to Measure
• Troubleshooting with the ip command
• Name Resolution
• ss/netstat and rpcinfo
• nmap
• Netcat
• tcpdump and wireshark
• Lab Tasks
– Determining the System's Configuration
– Troubleshooting with rpm
– Process Related Tools
– Network Tools

Module 3: Rescue Environments

• Diagnostic/Recovery
• Rescue Procedures
• Recovery: mount & chroot
• Recovery Examples
• Recovery: Network Utilities
• Lab Tasks
– Recovery Runlevels
– Recovering Damaged MBR
– Recover from Deleted Critical Files

Module 4: Topic Group1

• Linux Boot Process
• System Boot Method Overview
• systemd System and Service Manager
• Using systemd
• Booting Linux on PCs
• Troubleshooting With GRUB 2
• Boot Process Troubleshooting
• Troubleshooting: Linux and Init
• Process Management
• Process Management Tools
• Troubleshooting Processes: top
• Filesystem Concepts
• Filesystem Troubleshooting
• Backup Concepts
• Backup Troubleshooting
• Backup Troubleshooting
• Lab Tasks
– Troubleshooting Problems: Topic Group 1

Module 5: Topic Group2

• Networking Tools
• Linux Network Interfaces
• Networking Commands Review
• NetworkManager
• Networking Troubleshooting
• Networking Troubleshooting
• Virtual Interfaces/IP Aliases
• Network Teaming
• Xinetd Concepts
• Xinetd Troubleshooting
• TCP Wrappers Concepts
• TCP Wrappers Concepts
• TCP Wrappers Troubleshooting
• Netfilter/iptables Concepts
• Netfilter/iptables Troubleshooting
• Lab Tasks
– Troubleshooting Problems: Topic Group 2

Module 6: Topic Group3

• X11 Concepts
• X11 Server Operation
• X11 Troubleshooting
• Rsyslog Concepts
• System Logging
• systemd Journal
• systemd Journal's journactl
• Secure Logging with Journal's Log Sealing
• Syslog Troubleshooting
• RPM Concepts
• RPM Troubleshooting
• Common Unix Printing System (CUPS)
• CUPS Troubleshooting
• CUPS Troubleshooting
• at & cron
• at & cron Usage
• at & cron Troubleshooting
• Lab Tasks
– Troubleshooting Problems: Topic Group 3

Module 7: Topic Group4

• Users and Groups
• Users and Groups Troubleshooting
• PAM Concepts
• PAM Troubleshooting
• Filesystem Quotas
• Quotas Troubleshooting
• File Access Control Lists
• FACL Troubleshooting
• SELinux Concepts
• SELinux Troubleshooting
• SELinux Troubleshooting Continued
• Lab Tasks
– Troubleshooting Problems: Topic Group 4

Module 8: Topic Group5

Kernel Modules
• Kernel Modules Troubleshooting
• Logical Volume Management
• Creating Logical Volumes
• LVM Deployment Issues
• VG Migration, PV Resizing & Troubeshooting
• Software RAID Overview
• RAID Troubleshooting
• Multipathing Overview
• SAN Multipathing
• Multipath Configuration
• Multipathing Best Practices
• LDAP and OpenLDAP
• Troubleshooting OpenLDAP
• NIS and NIS+ (YP)
• NIS Troubleshooting Aids
• Lab Tasks
– Troubleshooting Problems: Topic Group 5

Module 9: Topic Group6

• DNS Concepts
• DNS Troubleshooting
• DNS Troubleshooting
• Apache Concepts
• Apache Troubleshooting
• Apache Troubleshooting
• FTP Concepts
• FTP Troubleshooting
• Squid Concepts
• Squid Troubleshooting
• Lab Tasks
– Troubleshooting Problems: Topic Group 6

Module 10: Topic Group7

• Samba Concepts
• Samba Troubleshooting
• Postfix Concepts
• Postfix Troubleshooting
• Postfix Troubleshooting
• IMAP & POP Concepts
• IMAP/POP Troubleshooting
• MariaDB
• MariaDB Troubleshooting
• Lab Tasks
– Troubleshooting Problems: Topic Group 7