‘Golden Kuberstronaut’ Journey (15/15): The Grand Finale! 🏁 LFCS 93 Points High Score Pass Review & 15 Certifications

Hello! The ‘Golden Kuberstronaut’ project, which has been running towards 15 certifications, has finally reached its spectacular conclusion today. 👋

I received notification of passing the final 15th hurdle, the LFCS (Linux Foundation Certified Sysadmin) exam, with a high score of 93 points! 🏔️ When I first started the project, I had doubts, wondering, “Can I really get all 15?” But by steadily walking, I’ve somehow found myself at the summit. I want to express my gratitude to everyone who has supported and watched me along the way, and I’m sharing my final pass review.

---

🚀 LFCS Short-Term Intensive Strategy: “4 Days Are Enough”

Since I’ve dealt with Linux extensively in lectures and practical work, I focused on honing my practical skills rather than listening to separate theoretical lectures.

• Utilize Udemy KodeKloud: I used the KodeKloud course, which costs about 15,000 KRW. The core of this is the 4 Mock Exams. I went through them twice: once reviewing the explanations, and once on my own. Don’t worry too much if you can’t solve all of them, as many problems are duplicated. We have Killer Shell! Link: https://www.udemy.com/course/linux-foundation-certified-systems-administrator-lfcs/
• KillerShell, the Decisive Move on Exam Day: I unlocked the KillerShell session on Saturday, the day of the exam. Two free sessions are provided, and I recommend using them strategically in case of a retake. I maximized my practical sense by going through this 36-hour session once with explanations and once on my own. It’s accessible from LinuxFoundation after exam registration.
• Last 10-Minute Summary Note: Right before the exam, I thoroughly memorized my own ‘Last-Minute Memorization Items’ where I had organized commonly confusing commands. The amount isn’t as much as you’d think, and the English questions in the actual exam are more concise than in the mock exams, so memorizing just this note gives you a good chance of passing. Link: https://gasbugs.tistory.com/545

---

🔥 Practical Troubleshooting: A Battle with virt-install

The exam questions were easier than expected, but I encountered an unexpected obstacle: a problem involving using virt-install to set up a virtual machine on libvirt.

I struggled for a long time because I missed the noconsole option, which prevented the virtual machine from starting properly. In the end, I had a tough time deleting the existing configuration and setting it up again. Honestly, if I hadn’t had prior knowledge from analyzing OpenStack operations and giving lectures at SDS, I might have panicked and wasted all my time. 😅

But don’t worry! The passing score for LFCS is quite low at 67 points. Even if you bravely skip truly difficult problems, the difficulty is such that you can sufficiently reach the passing threshold.

---

📝 LFCS Practical 17 Questions Review

For those preparing, I’m sharing the 17 types of problems I encountered. However, problems can be modified in a question bank style, so be sure to prepare according to the strategies I mentioned earlier.

1. User Limits Setting: Permanent setting of soft/hard limits using /etc/security/limits.conf
2. File Management: Check usage with df and search/delete conditionally using find
3. NFS Configuration: Add allow items like insecure option to /etc/exports
4. Kernel Parameters: Permanent setting of parameters using sysctl
5. Containers: Docker build and run
6. Storage: LVM volume size expansion
7. Security: OpenSSH server configuration (/etc/ssh/sshd_config)
8. Git: Basic commit and push operations
9. Job Scheduling: crontab -u setting for a specific user
10. Web Server: Apache2 service status check and troubleshooting
11. Certificates: Check Cert domain information using openssl
12. Process Management: Check Write I/O, stop process, umount action
13. Time Synchronization: Install timesyncd and NTP synchronization
14. Account Management: User and group creation/management
15. Build: Bool binary build
16. Virtualization: VM creation using virt-install
17. Firewall: iptables REDIRECT and netfilter-persistent configuration

---

✨ Concluding: Finishing the ‘Golden Kuberstronaut’ Grand Journey (15/15)

Finally, I have all 15 target certifications in my hands! 🏆

Taking the LFCS exam once again made me realize that a strong foundation is essential for the cloud technologies built upon it to remain stable. I believe these 15 certifications are not just pieces of paper, but evidence of my growth as an infrastructure and security expert.

Now that the goal of obtaining certifications has been achieved, there is still an infinite amount to learn in the sea of technology. The ‘Golden Kuberstronaut’ journey ends here, but new challenges will continue for me, Instructor Kim Yeon, to deliver more valuable knowledge to you. 🚀

Thank you for being with me all this time. I will return with more in-depth and useful technical posts! 🫡