Linux Fundamentals

Portal | All Topics | Domain: Linux | Tier: 1

Also known as: linux, linux-basics, filesystem, permissions

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📘 Topic Packs

Asset	Level	Time	Status
/proc Filesystem	L2	3h	solid
Advanced Bash for Ops	L1	5h	solid
Debian & Ubuntu Ecosystem	L1	6h	solid
Disk & Storage Ops	L1	5h	solid
Edge & IoT Infrastructure	L2	4h	solid
Environment Variables	L1	2h	solid
Kernel Troubleshooting	L3	6h	solid
LPIC / LFCS Exam Preparation	L2	30h	solid
Linux Boot Process	L1	3h	solid
Linux Distribution Comparison	L1	4h	solid
Linux Logging	L1	4h	solid
Linux Memory Management	L1	4h	solid
Linux Ops	L0	5h	solid
Linux Performance Tuning	L2	7h	solid
Linux Signals & Process Control	L1	3h	solid
Linux Users & Permissions	L1	4h	solid
Mental Models (Core Concepts)	L0	4h	solid
Pipes & Redirection	L1	3h	solid
Process Management	L1	4h	solid
RHCE (EX294) Exam Preparation	L2	40h	solid
Regex & Text Wrangling	L1	5h	solid
SELinux & AppArmor	L2	5h	solid
SSH Deep Dive	L1	4h	solid
Virtualization	L2	5h	solid
cgroups & Linux Namespaces	L2	4h	solid
curl & wget	L1	3h	solid
eBPF & Modern Linux Observability	L3	5h	solid
iptables & nftables	L1	4h	solid
rsync	L1	3h	solid
systemctl & journalctl Deep Dive	L1	4h	solid
tar & Compression	L1	2h	solid
tmux & screen	L1	2h	solid

🏋️ Exercise Sets

Asset	Level	Time	Status
Bash Exercises (Quest Ladder) (CLI)	L0	8h	solid

⚡ Drills

Asset	Level	Time	Status
Linux Ops Drills	L0	30m	solid

🎯 Scenarios

Asset	Level	Time	Status
Adversarial Interview Gauntlet (30 sequences)	L2	15h	solid
Interview: Linux Server Slow	L1	15m	solid

📝 Assessments

Asset	Level	Time	Status
Skillcheck: Linux Fundamentals	L0	30m	solid

📎 References

Asset	Level	Time	Status
Track: Foundations	L0	20h	solid

🔍 Case Studys

Asset	Level	Time	Status
Case Study: CI Pipeline Fails — Docker Layer Cache Corruption	L2	30m	solid
Case Study: Container Vuln Scanner False Positive Blocks Deploy	L2	30m	solid
Case Study: Disk Full Root Services Down	L1	30m	solid
Case Study: Disk Full — Runaway Logs, Fix Is Loki Retention	L2	30m	solid
Case Study: HPA Flapping — Metrics Server Clock Skew, Fix Is NTP	L2	30m	solid
Case Study: Inode Exhaustion	L1	30m	solid
Case Study: Job Queue Backlog — Worker Pod CPU Throttled by cgroup	L2	30m	solid
Case Study: Kernel Soft Lockup	L2	30m	solid
Case Study: OOM Killer Events	L2	30m	solid
Case Study: Runaway Logs Fill Disk	L1	30m	solid
Case Study: SELinux Denying Service	L1	30m	solid
Case Study: Terraform Apply Fails — State Lock Stuck, DynamoDB Throttle	L2	30m	solid
Case Study: Time Sync Skew Breaks App	L2	30m	solid
Case Study: Zombie Processes Accumulating	L1	30m	solid
Ops Archaeology: The Container That Exits Immediately	L1	30m	solid
Ops Archaeology: The Gateway That Returns 502	L1	30m	solid
Ops Archaeology: The Job That Succeeded Wrong	L2	30m	solid
Ops Archaeology: The Replica That Fell Behind	L2	30m	solid
Ops Archaeology: The Service That Won't Start	L1	30m	solid
Ops Archaeology: The Slow Death Nobody Noticed	L2	30m	solid

Related Topics

• Bash / Shell Scripting (11 shared assets)
• systemd (11 shared assets)
• Filesystems & Storage (6 shared assets)
• Kubernetes Core (5 shared assets)
• Docker / Containers (5 shared assets)
• Linux Networking Tools (4 shared assets)
• Package Management (3 shared assets)
• Linux Performance Tuning (3 shared assets)
• Linux Hardening (3 shared assets)
• Prometheus (3 shared assets)

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