• 본 과정은 리눅스 시스템을 운영하는데 필요로하는 트러블슈팅 과정입니다.
• 리눅스 기반으로 데이터베이스, 어플리케이션, 웹서버 및 DNS서버 등을 운영 관리하시는 관리자들이 시스템 운영중 발생되는 여러가지 문제 해결 방법을 학습하고자 하는 분들을 위한 과정입니다.
• 기본 리눅스 시스템에서의 트러블 슈팅과 여러 어플리케이션 구동시 발생되어지는 문제에 대한 트러블 슈팅 방법들을 이 과정을 통해 배울 수 있습니다.
• 5일 동안 진행되는 다양한 실습 위주의 수업을 통하여 리눅스 시스템 전문가로 나아갈 수 있도록 철저하게 준비 시켜드립니다.

• 리눅스 시스템 운영자 및 운영을 준비하는 관리자
• 리눅스 기반의 서비스 운영자 및 서비스 운영을 준비하는 관리자
• 웹서버, 파일서버 관리자
• 리눅스 시스템 운영을 하면서 여러 가지 문제해결 방법을 체계적으로 습득하고자 하는 운영자

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

• Linux 관리자 단기집중 중급(Admin 1 + Admin 2)과정(H0AX5S)
• Enterprise Linux Administration I (H7091S)
• Enterprise Linux Administration ll (H7092S)
• 정규 수업은 수강하지 않았으나 시스템 운영 및 유지보수를 하고 있는 운영자
• 기본 시스템 운영 방법 및 네트워크 서비스 운영 방법을 숙지하고 있는 운영자

• Linux Security(U8630S)
• Enterprise Linux High Availability Clustering(HK967S)
• Linux Virtualization(H0AX7S)