Linux Foundation Certified System Administrator · LFCS
One workspace for passing the LFCS — a fully hands-on, performance-based exam (you solve real tasks on a live command line, no multiple choice). The labs are the real work; the five domain decks and the recall exam lock in the commands and concepts behind them. Authored against the official Linux Foundation domains.
The honest read: the LFCS is 100% hands-on — you fix and configure a real system at the prompt, no multiple choice. So the labs are the real study plan; the decks and practice exam exist to lock in the exact commands, flags, and file locations you need in reflex memory. Front-load Operations Deployment and Networking — together they're half the exam.
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Watch first
The exam at a glance
verified July 2026†Passing score and validity are shown as standard/as-seen — the Linux Foundation doesn't publish an exact cut score. Confirm current cost, format, and policy on the official certification page before you book.
Certification roadmap
sequenceFree self-paced course (Linux Foundation / edX)
Recommended, not required. Do it first if the basics (filesystem, shell, permissions, processes) are shaky. Free — see resources below.
Performance-based · live CLI · 2 hrs · ~67% to pass † · 3-year validity † · $445 (1 free retake)
The target of this workspace. 100% hands-on — you solve real tasks on a live command line, no multiple choice. Proves you can administer a Linux system: manage users, storage, networking, and services under time pressure.
Performance-based · advanced
Builds directly on LFCS — Kubernetes admin is Linux admin plus orchestration, same performance-based style and the same Killercoda practice ecosystem. There's a full CKA workspace here too.
Exam domains — weight your study by these
official weightsThe five official Linux Foundation domains, in weight order. Under each: the recall deck and the hands-on lab where you actually practice it — so you can go straight from “what's tested” to “where I drill it.”
systemd services & targets, the boot process & GRUB, scheduling (cron/at/systemd timers), package management, kernel modules & sysctl, process priorities, and SELinux basics.
IP config & routing (the `ip` suite), persistent config (NetworkManager/netplan), DNS resolution, firewalls (firewalld & nftables), SSH, port inspection (`ss`), and time sync.
Partitions & filesystems, mounting via /etc/fstab (by UUID), LVM (PV→VG→LV) & growing volumes, swap, ext4-vs-XFS resizing, quotas, RAID, and LUKS encryption.
File operations, text processing (grep/sed/awk), permissions & ownership (numeric + special bits), links, archives & compression (tar/gzip), find, and globbing.
Account & group lifecycle, the usermod -aG append trap, password/account aging, the passwd/shadow/group files, and sudo via sudoers.
Operations Deployment (25%) + Networking (25%) = half the exam. Because it's performance-based, practice by DOING each task on a live shell, not by memorizing flags. The five decks carry 106 cards distributed to match these weights.
Hands-on labs — the real practice
live · do these mostThe LFCS is solving real tasks at the prompt — so this is where you should spend most of your time. Both run in the browser.
Note: the in-browser labs open on Killercoda. Auto-grading turns on once the Dev Bench Killercoda account is connected; until then, use them as guided practice and check your work against the scenario steps. For always-on graded reps, the free killercoda.com Linux playgrounds are the closest free thing to the real exam's live-shell format.
Flashcard decks — the recall layer
5 decks · 106 cardsThe other four domains
Practice exam
live · 85-question poolThe real LFCS is hands-on, so this MCQ quiz is a recall/weak-area tool — it does not replace the labs. Use it to find gaps, then close them at the prompt.
Skill map — where to practice each thing
the workspace| Skill | Practice with | Status |
|---|---|---|
| Solve real admin tasks at a live shell (all domains) | Linux lab — Learn + Break-fix | ready |
| Shell fluency, pipelines & text processing (Essential Commands) | Bash lab | ready |
| Commands, flags & file locations in reflex memory | The 5 LFCS decks (106 cards) | ready |
| Exam-format recall & weak-area finding | LFCS practice exam (draw 40, pass 70%) | ready |
| Full disposable Linux environments under a timer | killercoda.com (external, free) | external |
A study routine
- 1.Live over notes: for every command you learn, run it on a real shell until the syntax is reflex. Performance exams reward speed and muscle memory, not recognition — spend most of your time in the Linux lab and on Killercoda.
- 2.Front-load Operations Deployment (25%) and Networking (25%) — half the exam. Do each deck, then reproduce every command in the Linux lab.
- 3.Drill storage as a whole workflow: partition → mkfs → mount → fstab (by UUID) → LVM grow. It's 20% and it's where timing pressure bites; `lvextend -r` and the XFS-can't-shrink rule are classic traps.
- 4.Use the practice exam to find weak domains, then close them at the prompt — the per-domain breakdown tells you exactly where to drill.
- 5.Practice under a timer. The exam is 2 hours of tasks — build the habit of solving cleanly, using `man`/`tldr` on-box, and moving on. Hit the exam's ~67% on the practice quiz three times before you book.
Curated resources — free-first
verified July 2026Everything you need to LEARN the LFCS is free (the official domains + LFS101 + Killercoda). Only the exam voucher and the optional courses cost money. Every link checked live (July 2026); prices/versions shift, so treat costs as “as seen.”