Filesystem Architecture Diagram

LinuxOps – DevOps Project

Server Automation & Security | Hands-on Linux Lab

This repository contains a practical LinuxOps / DevOps lab focused on real Linux fundamentals:

• User & group management
• Permissions & ownership
• Directory and file operations
• Text processing (sed, vi)
• System inspection commands
• Cleanup & hygiene

🎯 Goal: Learn Linux by doing, not copy‑pasting.

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🚀 Quick Start (Run This First)

Run Ubuntu Linux Container (Persistent & Long‑Term)

docker run -dit \
--name ubuntu-container \
--hostname ubuntu-dev \
--restart unless-stopped \
--cpus="2" \
--memory="4g" \
--mount type=bind,source=/tmp/ubuntu-data,target=/data \
-v /var/run/docker.sock:/var/run/docker.sock \
-p 2222:22 \
-p 8080:80 \
--env TZ=Asia/Kolkata \
--env LANG=en_US.UTF-8 \
ubuntu:latest /bin/bash

Enter the container:

docker exec -it ubuntu-container bash

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🧠 Docker Parameters Explained

Parameter	Description
-dit	Detached + interactive terminal
--name ubuntu-container	Container name
--hostname ubuntu-dev	Hostname inside container
--restart unless-stopped	Auto‑restart policy
--cpus="2"	CPU limit
--memory="4g"	Memory limit
--mount type=bind,source=/tmp/ubuntu-data,target=/data	Persistent storage
-v /var/run/docker.sock:/var/run/docker.sock	Docker access inside container (optional)
-p 2222:22	SSH port mapping
-p 8080:80	Web service port
--env TZ=Asia/Kolkata	Timezone
--env LANG=en_US.UTF-8	Locale
ubuntu:latest /bin/bash	Ubuntu image + Bash

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🧪 Deployment Steps

Step 1 – Initial Setup (root)

1. Create users: Dev1, Dev2, Dev3
2. Create groups: devops, aws, management, sales
3. Change primary group of Dev2, Dev3 → devops
4. Add aws as secondary group to Dev1
5. Create directory & file structure (as per diagram)
6. Change group of /dir1, /dir8/dir9, /f2 → devops
7. Change ownership of /dir1, /dir8/dir9, /f2 → Dev1

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Step 2 – Additional Users & Groups (root)

1. Create users: Dev4, Dev5
2. Create groups: app, database

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Step 3 – File Operations

1. root: Create file /f3
2. root: Rename /f2 → /f4
3. Dev4: Move /dir1/f1 → /dir2/dir1/dir2

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Step 4 – Advanced Filesystem Tasks

1. root: Create /home/Dev2/dir1
2. root: From /dir2/dir1/dir2/dir10, create /opt/dir12/dir10/f1 using relative path
3. root: Delete /dir4 recursively
4. root: Delete all child items under /opt/dir12
5. Dev1: Move /opt/dir12/dir10/f1 → /home/Dev1
6. root: Write text to /f3

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Step 5 – Text Processing & Cleanup

1. root: Create /dir1/f2
2. root: Delete /dir6
3. root: Delete /dir8
4. root: Replace DevOps → devops in /f3
5. root: Using vi, copy line 1 and paste it 10 times
6. root: Replace Engineer → engineer
7. root: Delete /f3

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Step 6 – System Inspection (root)

1. Search file f3 (absolute paths)
2. Count files in /
3. Print last line of /etc/passwd

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Step 7 – Filesystem Verification

1. Verify filesystem usage using df -h
2. Create /data/f1

⚠️ Docker Note: mount / umount are restricted in standard Docker containers.

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Step 8 – Final Cleanup (root)

1. Delete /dir1, /dir2, /dir3, /dir5, /dir7
2. Delete /f1, /f4
3. Delete /opt/dir12

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Step 9 – User & Group Cleanup (root)

1. Delete users: Dev1, Dev2, Dev3, Dev4, Dev5
2. Delete groups: app, aws, database, devops, management, sales
3. Remove remaining home directories (if any)

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🐳 Docker vs VM Compatibility

Feature	Docker	VM / EC2
Users & groups	✅	✅
Files & permissions	✅	✅
Text processing	✅	✅
mount / umount	❌	✅

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🔗 Connect with Me

• GitHub: https://github.com/piyush-pooh
• LinkedIn: https://www.linkedin.com/in/piyush-sharma-5250a0291/
• Twitter (X): https://x.com/Piyush_poooh

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⭐ Support the Project

If this lab helped you understand Linux the right way, please ⭐ star the repository and share it 🚀

LinuxOps mindset: Don’t fight Linux. Understand it.