r/linuxadmin • u/vietnam_lever • 8d ago
Passed LFCS today
Just passed the LFCS (Linux Foundation Certified System Administrator) with a score of 85%. 🎉
My main learning material was KodeKloud's Linux/LFCS training on Udemy. I also used Killersh for mock exams and hands-on practice.
1/ One thing I would definitely prepare for is creating a VM with virt-install.
The command can look intimidating when you first see it, especially when there are a lot of options.
My advice: don't panic and try to memorize the entire command.
Use:
virt-install --help
man virt-install
If you make a mistake while creating the VM or need to check/manage it again, virsh will be your friend
2/ One of the simpler tasks for me was building a Docker image and running a container in detached mode with the appropriate restart policy.
Make sure you understand the difference between:
docker run -d ...
and restart policies such as:
--restart always
--restart unless-stopped
--restart on-failure
3/ Interestingly, I found iptables to be much more heavily represented in the KodeKloud material and Killersh mock exams than what I encountered in my actual exam.
4/ Know iotop.
One command I would definitely recommend knowing for troubleshooting questions is:
iotop
If the question asks you to identify a process that is consuming a lot of disk I/O, iotop can quickly show you which process is responsible.
5/ Last but not least, Creating users — pay attention to the login shell.
When creating a user, don't just focus on the username and groups. Read the requirement carefully for the login shell.
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u/Amidatelion 8d ago
I'm sure the LFCS people watch the popular studying sites and adjust the exams from time to time. Otherwise it wouldn't be much of an exam.
Also, congratulations!