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All 12 Linux domains — Round 2 Complete ✅ /// Now learning Bash Scripting + Real Incident Simulation /// limonlab.online — Ubuntu Server live on public internet /// Linux Mastery Road to Cloud — studying 4hrs/day since Jan 2026 /// All 12 Linux domains — Round 2 Complete ✅ /// Now learning Bash Scripting + Real Incident Simulation /// limonlab.online — Ubuntu Server live on public internet /// Linux Mastery Road to Cloud — studying 4hrs/day since Jan 2026 ///

All Posts

Every article, incident writeup, concept test, and domain deep dive from the Linux Mastery Road to Cloud series.

03 · Permissions
03 · Permissions

Linux Permissions Deep Dive — Part 2: ACLs and Troubleshooting

Part 1 covered SUID, SGID, the sticky bit, and umask. This part covers the mechanism that takes over when standard…

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fastandcurious · 8 min read · Apr 2026
03 · Permissions
03 · Permissions

Linux Permissions Deep Dive — Part 1: Special Bits and umask

If you’ve already got chmod, chown, and basic rwx down, this is where permissions get genuinely interesting — and where…

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fastandcurious · 6 min read · Apr 2026
04 · Process Management
04 · Process Management

How a Romanian Hacker Lived Inside My Server for Days (And What I Did About It)

I was doing a routine SSH login on a Friday morning when I noticed something that stopped me cold: That…

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fastandcurious · 7 min read · Apr 2026
04 · Process Management
04 · Process Management

Ticket Simulations Part 2 — SSH Disconnects, OOM Killer, Signals and /proc

Continuing from Part 1. This post covers tickets 6 through 10 from my Domain 4 Round 2 simulations — the…

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fastandcurious · 9 min read · Apr 2026
04 · Process Management
04 · Process Management

Ticket Simulations Part 1 — What I Learned Investigating Real Server Problems

This is part of my ongoing Linux learning series where I document everything I study, including the mistakes, the confusions,…

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fastandcurious · 7 min read · Apr 2026
08 · Logging & Troubleshooting
08 · Logging & Troubleshooting

How I Investigate a Full Disk on a Linux VPS (Step by Step)

Getting a disk usage alert on a production server is one of those moments that demands immediate action. If the…

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fastandcurious · 5 min read · Mar 2026
06 · Systemd & Services
06 · Systemd & Services

Real Systemd Troubleshooting: 4 Lessons That Actually Stuck

I have been studying Linux since January 2026. I finished the theoretical side of all 12 domains I planned. But…

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fastandcurious · 6 min read · Mar 2026
12 · Monitoring & Scheduling
12 · Monitoring & Scheduling

I Spent 2 Hours Building One Bash Script — And It Was Worth Every Minute

Series: Linux Mastery Road to Cloud I want to be honest with you. I am not a programmer. I have…

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fastandcurious · 6 min read · Mar 2026
12 · Monitoring & Scheduling
12 · Monitoring & Scheduling

Linux Monitoring & Scheduling: What I Learned Running a Live Public Server

Part of my Linux Mastery Road to Cloud series — Domain 12: System Monitoring & Scheduling When I first set…

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fastandcurious · 8 min read · Mar 2026
09 · SSH & Remote Access
09 · SSH & Remote Access

SSH & Remote Access — What I Actually Learned Running a Public Server

Series: Linux Mastery Road to Cloud | Domain 9 There’s a moment every Linux learner hits where SSH stops feeling…

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fastandcurious · 12 min read · Mar 2026